232/1,232/2,232/3 physics

RAISMARADE JOINT EXAMINATION 2016 PHYSICS - MARKING SCHEME

PAPER 3

1.(a) V = 14ml + 0.1ml1 or 14cm3+ 0.cm3(1mk)

-Pour some water in the measuring cylinder and record the volume V1.

-Lower the 100g mass into the measuring cylinder using a string and record the new volume VS. ½

Therefore volume of 100g mass = V2 - V1. ½(1mk)

(b) (i) Centre of gravity = 50cm + 0.51(1mk)

(ii)X=10cm

Y=9.3cm1 or 930mm(1mk)

(c)

Xmm100150200250300350

Ymm93133178221263306

+1mm ½ each

(d) A GRAPH OF YCM AGAINST XCM

Graph P - 2, A - 1. S - 1, L - 1 ………………………………………(5mks)

Xmm101520253035

Ymm9.313.317.822.126.330.6

NOTE:

S - Scale: simple and uniform.

A - Axes: labeled with correct units. P - plotting: 4 - 5 points - 2mks 2 - 3 - 1mk

<2 - 0

L - Straight line through the origin.

(e) N= DY =18.5 - 12=6.5

DX21 - 13.57.5

=0.86671 (unit less)(3mks)

(f) Given N = F/W where F - apparent weight of mass in salt solution.

W - actual weight of mass in air.

N - is the gradient.

(g) F= WN but w = 0.1kg x 10N/Kg = 1N

=0.8667 x 1

=0.8667N = 0.87N1

(ii) U= W - F

=(1 - 0.8667) 1

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=0.133

~0.13N1

(h) Upthrust=pvg

0.13=p x 14 x 10-6 x 10

p=0.131

14x10-6 x 10

=928.57Kg/m31

2.

(iii) Table

Length (L) (m)0.20.40.60.81.0

Current (I) (A)0.220.200.190.170.16+0.05A2

Voltage (V) (V)1.601.501.401.301.20+0.2V2

5 values - 4mks

(iv)4 values - 3mks

3 values - 2mks 2 values - 1mk

NOTE:

S - Scale: simple and uniform.

A - Axes: labeled with correct units.

P - plotting:4 - 5 points - 2mks

2 - 3 - 1mk

<2 - 0

L - Straight line through the origin.

(v)Gradient=Points on the line - 1mk1

Substitution

= 7.43575 +2Ω (1mk) 1

(vi)d = 0.21 + 0.01mm=2.1 + x10-4m 1mk1

(vii)K=7.43575 x (2.1E - 4)2 x π =5.15 x 10-7Ωm Substitution - 1mk

2Answer - 1mk

Part B

(i) f1=20.0 + 2.0cm(1mk)

(iv)

Distance, x of lens from crosswireDistance, y(cm)Distance, d(cm)y - d (cm)

(cm)+1cm+1cm

3519.0½52.5½33.5½

4511.0½43.0½32½

( ½mk each, 1 mk both)

(v) (33.5 + 32) / 2=32.75cm1(1mk)

(vii) f2=32.75=16.75cm1(1mk)

2

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232/1,232/2,232/3 physics

KIGUMO SUB-COUNTY CLUSTER EXAM 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS

PAPER 1 (THEORY) TIME: 2 HOURS JULY/AUGUST, 2016

1. In the space below give a sketch of a closed micrometer screw gauge showing an error of +0.02.(1mk)

2. The figure 1 below shows a measuring cylinder which contains water initially at level A. When a solid of weight 0.3N was immersed in the water, level rose to B.

Fig. 1

Use this information to answer the question that follow.

Determine the density of the solid mass giving your answer in g/cm3.(3mks)

3. The figure 2 below shows a match stick floating on the surface of water in a basin,

Fig. 2

When a drop of soap solution was carefully added to the water at A, the match stick is observed to move in a certain

direction. State the direction of this match using A and B and explain this observation.(2mks)

4.The figure 3 below shows a cube of a certain wood whose density is the same as the density of water held on the surface of

water in a beaker. Complete the figure (b) to show the final position of the cube when it is released.(1mk)

Fig. 3(a)(b)

5.A block of metal of mass 5 kg is heated to 1100 and then gently immersed in 2kg of water in a container of negligible heat

capacity. The final temperature of water is found to be 500C. What was the initial temperature of the water?

Specific heat capacity of metal = 840jKg-1K-1

Specific heat capacity of water = 4200jKg-1K-1(3mks)

6.A spring of spring constant 60n/m is extended through 50cm. Calculate the amount of work down in stretching.(2mks)

7.Explain why it is sometimes easier to remove a metallic lid from a tightly closed glass jar after warming it under hot running

water.(2mks)

8.Heat transfer by radiation is faster than heat transfer by conduction. Explain.(2mks)

9.The figure 4 below shows a spring full of water. It has two identical holes A and B - drilled along its cylinder. The cylinder’s

nozzle is closed.

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State with a reason how the speed of the jets of water from A and B compared when the piston is pushed into the cylinder.

(2mks)

10. If you are a weatherman stationed in the arctic region (at the earth poles) state with a reason the thermometric liquid most

suitable for your thermometer.(2mks)

11. In the figure 5 below distance AC = kB, calculate the force F that will keep the system in equilibrium.(2mks)

12. The figure 6 below shows parts A, B and C of a glass tube.

Fig. 6

State with a reason the part of the tube in which the pressure will be lowest when air is blown through the tube from A

towards C.(1mk)

13. The figure 7 below shows a velocity-time graph of a moving body.

Describe the motion of the body over

i) region DE(1mk)

ii) region EF(1mk)

14.(a) A bullet of mass 20g moving with a velocity of 100m/s embed on a stationery object of mass 900g suspended so that it

can swing freely as shown in the figure below.

Determine

i) the velocity of the bullet and block immediately after collision.(3mks)

ii) the height through which the block rises.(3mks)

(b) A train travelling at 100km/h increases its velocity to 132km/h in 8 minutes. Calculate its acceleration in m/s.(3mks)

15.(a) The figures below shows a student of mass 60kg sliding freely down the slope AB. She continues and stops at point C.

Fig. 8

The frictional force is one-third of the students weight and acts uniformly all along the slide A to C. Take g = 10m/s2.

(i) How much potential energy is lost by the student in sliding from A to B.(2mks)

(ii) Calculate the horizontal distance BC.(3mks)

(iii) Ignoring friction along AB and air resistance find the maximum velocity with which the student slides at any one

point along the path.(2mks)

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(b) The figure 9 shows a set of gears used to lift a load attached to the axle P by applying an effort to the axle.

(i) In order to lift the load through a distance of 2m, the axle P must rotate 5 times. How many times must axle Q be

rotated.(2mks)

(ii) Through what distance must the effort be applied of the axles P and Q have the same diameter.(2mks)

16.(a) State the difference between the Archimedes principle and the law of floatation.(2mks)

(b) The figure below shows three stages of an experiment to determine relative density of a cork, which normally floats on water.

In (I) above a spring balance is used to measure weight W of the cork in air in (II) the spring balance is used to measure the apparent weight W1 when only the sinker is submerged in water.

In (III) the spring balance is used to measure the apparent weight W2 when both the cork and the sinker are submerged. The following observations were made

W = 0.0N

W1 = 0.6N W2 = 0.28N

Use this information to determine the:

(i) upthrust on cork.(2mks)

(ii) relative density of cork.(3mks)

(c) The figure below shows two glass tubes of different diameters dipped in water.

Explain why h2 is greater than h1.(3mks)

d) Some cotton wool soaked in conc. ammonia solution and hydrochloric acid were placed at the ends of a glass tube as

show below.

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After sometime a white deposit of ammonium chloride forms on the walls of the glass tube. Use a mark to show where

the white deposit is formed.(1mk)

17. (a) Distinguish between streamline and turbulent flow.(2mks)

(b) The figure below shows two light sheets of paper arranged as shown.

Explain the observation made when air is blown at the same speed and time at point A and B.(2mks)

(c) The figure below shows an incompressible fluid moving through a tube of varied cross section area. If the area of the small

tube is 0.05m2, Calculate the diameter of the large tube in cm.(3mks)

(d) Use the figure below to answer the questions that follow.

(i) What is the pressure resting on point A?(1mk)

(ii) What is the value of pressure difference in the instrument reading?(1mk)

(iii) If the atmosphere pressure is 760mm of mercury, what is the value of gas pressure?(2mks)

18. (a) State the factors affecting centripetal force.(3mks)

(b) A mass of 0.4 kg is rotated by a string at a constant speed V in a vertical circle of radius 1 m.

The minimum tension in the string is 6N.

(i) Indicate on the diagram below the position of the object for the minimum tension,(1mk)

(ii) Write an expression for this uniform force experienced.(1mk)

(iii) Use your expression to determine the velocity V.(3mks)

(iv) Determine maximum tension on the string.(2mks)

c) Using the kinetic theory of gases explain how a rise in temperature of a gas causes arise in the volume of the gas if the

pressure is kept constant.(3mks)

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232/1,232/2,232/3 physics

KIGUMO SUB-COUNTY CLUSTER EXAM 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/2

PHYSICS

PAPER 2 (THEORY) TIME: 2 HOURS JULY/AUGUST, 2016

1. Figure 1 below shows an object in front of plane mirror.

Figure 1

Sketch image of object using mirror shown.(1mk)

2. Figure 2 below shows an object infront of concave mirror and it’s image.

Figure 2

Locate position of its principal focus.(2mks)

3. State the energy transformations when fast moving electrons are suddenly stopped by metal target.(1mk)

4. Define the term threshold wavelength as used in photoelectric emission.(1mk)

5. State the use of Manganese (IV) oxide in dry cell.(1mk)

6. Use figure 3 below to answer following questions.

Figure 3

Determine

(a) Total resistance.(3mks)

(b) Potential difference across 4 resistor.(3mks)

7. Figure 4 shows conductor carrying current in magnetic field and moves in direction shown.

Figure 4

Identify polarities X and Y.(2mks)

8. Define half life as used in radioactivity.(1mk)

9. Use figure 5 to answer following question.

Figure 5

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232/1,232/2,232/3 physics

Determine the frequency of wave.(3mks)

10. Sketch diode circuit in reverse biased mode.(1mk)

11. A student shouts and hears an echo after 0.6 seconds. If the velocity of sound is 330m/s. Calculate the distance between

student and reflecting surface.(3mks)

12. Figure 6 shows water waves moving towards barrier.

Figure 6

13. State two properties of cathode rays.(2mks)

14.(a) State two factors that determine the magnitude of an induced emf in a conductor.(2mks)

(b) A power station has input of 50kw at p.d. of 10 Kv. A transformer with secondary coils of 1000 turns is used to step

down the voltage to 1000v for transmission along grid. Assuming there is no power loss, calculate:

(i) Current in primary coil.(2mks)

(ii) Number of turns in primary coil.(2mks)

(iii) Current in secondary coil.(2mks)

(c) State which of coils in thicker and why.(2mks)

15.(a) Define refractive index.(1mk)

(b) The critical angle of a material is 43.20. Determine the refractive index of that material.(2mks)

(c) Define the term accommodation as used in lenses.(1mk)

(d) Figure 7 shows eye deflect

Figure 7

(i) Identify the defect.(1mk)

(ii) Show how the defect can be corrected on same diagram.(2mks)

(e) An object is placed 40cm in front of concave lense of focal length 20cm. Determine the position

of the image.(3mks)

16. (a) Define photoelectron.(1mk)

(b) State two factors affecting photoelectric effect.(2mks)

(c) Figure 8 on graph paper shows graph of stopping potential against frequency (graph paper)

(i) Define stopping potential.(1mk)

(ii) Given that stopping potential (Vs) is related to frequency by equation.

Vs = hf - Wo

eewhere e = 1.6 x 10-19 C

Determine from graph

i) Planck’s constant (h)(4mks)

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232/1,232/2,232/3 physics

(ii) Work function (wo) in (ev)(3mks)

17.(a) Define radioactivity.(1mk)

b) Identify the radiations of tracks in figure 9 below.

Figure 9(1mk)

(i)

(ii)(1mk)

(c) Identify radiations using figure 10 below.(3mks)

Figure 10

X Y and Z

(d) The following reaction is part of radioactive series

Identify radiation h and values of b and c(3mks)

18. Figure 11 shows cathode ray oscilloscope (CRO)

Figure 11

(a) Name parts labelled A and B(2mks)

(b) What are the functions of parts labelled C and D?(2mks)

(c) Why is the tube evaluated?(1mk)

(d) Four 40w bulbs and six 100w bulbs were switched on for 5 hours a day for domestic use in an institution. Find the

monthly bill for 30 days at rate of sh 5.50 per unit with standing charge of

sh 150.(3mks)

(e) Figure 12 shows X-ray tube

Figure 12

(i) Identify parts A and B.(2mks)

(ii) Calculate the number of electrons hitting the anode per second.(2mks)

(iii) X-ray tube is operating at 15kV and current of 15mA. Determine the velocity of electrons as they

strike the target. (e = 1.6 x 10-19, Me = 9.1 x 10-13 kg)(3mks)

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232/1,232/2,232/3 physics

KIGUMO SUB-COUNTY CLUSTER EXAM 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/3

PHYSICS PAPER 3

CONFIDENTIAL

Each student should have the following apparatus. Q1. One stand, two bosses, tow clamps Two pieces of thread (10cm) A stop watch

One metre rule

Two identical springs Six 100g masses One optical pin A piece of cellotape

Q2. Triangular prism of 600. Four optical pins

A softboard

A plain paper

KIGUMO SUB-COUNTY CLUSTER EXAM 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS

PAPER 3 (PRACTICAL) TIME: 2 HOURS

JULY/AUGUST, 2016 QUESTION 1

1. You are provided with the following

One stand, two bosses, two clamps Two pieces of thread

A stopwatch

One metre rule

Two identical springs Six 100g masses One optical pin A piece of cellotape

(a) Tie the two springs together side by side and set up the apparatus as shown.

(i) Hang the springs from rod (of one clamp) as shown in the figure

(ii)Tie together the upper end and the lower ends of the springs with pieces of thread as shown in the figure. (iii) Hang a 100g mass from the lower ends of the springs so that the mass is supported by both springs. (iv) Clamp the metre rule vertically.

(v) Use cellotape to fix the optical join on the top of the 100g mass so that it acts as a pointer.

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232/1,232/2,232/3 physics

(vi) Adjust the rule so that the pointer is directly along a particular scale mark of the rule. Record this mark in the table.

b) i) Add a 100g mass to the first mass. Record the new position of the pointer and the extension, e, in the table. ii) Add another 100g mass and record the new position of the pointer and the extension in the table. (iii) Repeat b (ii) until the total mass supported by the spring is 600g.

c) (i) Re move the rule, displace the 600g mass slightly downwards and release it to oscillate vertically. ii) Time 20 oscillations. Record in the table the time t 1 for 20 oscillations. Repeat to obtain the time t2.

Calculate and record the average time and the periodic time T.

(iii) Repeat c(i) and (ii) for 500g, 400g, 300g and 200g masses.

(iv) Find T2 and complete the table.

(9 mks)

d) i) Plot a graph of T2 against extension e(5mks)

ii) Determine the gradient of the graph and state its units.(3mks)

iii) The equation of the graph is given by

T2 = 4e+ c

b

where b and c are constants. Determine the value of b.(3mks)

Question 2

You are provided with the following A triangular prism of 600. Four optical pins

A soft board

A plain piece of paper Proceed as follows

(a) Place the plain sheet of paper on the soft board

(b) Place the prism with one face on the plain paper and trace its outline.

(c) Remove the prism from the plain sheet of paper.

(d) Mark angle A and record its value.

A = ..... (1mk)

(e) Draw a normal as shown and draw a ray of incident on the normal at an angle of incidence of 300.

(f) Replace the prism on the outline on the sheet.

(g) Stick two pins P1 and P2 along the path of the incident ray as shown in the diagram.

(h) View the images of P1 and P2 through the glass prism through face AC as shown on the diagram.

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232/1,232/2,232/3 physics

(i) Stick two pins P3 and P4 so that they appear to be in line with P1 and P2 as seen through the glassprism.

(j) Remove the pins and prism from the sheet. Trace the path of the ray until it emerges from the

glass as shown in the diagram.

(k) Extend the incident ray and the emergent ray until they meet at P. Measure and record the angle of deviation d.

(l) Repeat the experiment for other angles of incidence shown in the table.

(8 marks)

(m)Plot a graph of angle of deviation (d)0 against angle of incidence (i)0.(5 marks)

(n)From the graph determine the minimum angle of deviation D.(2 marks)

(p)Find the refractive index of the prism material using(4 marks)

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232/1,232/2,232/3 physics

KIGUMO SUB-COUNTY CLUSTER EXAM 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS

PAPER 1 (THEORY) MARKING SCHEME

1.

2.f =m == 2.5g/cm3

3.Surface tension at A reduces and greater surface tension at B pulls the matchstick in the direction shown.

4.Top level must be the same as water level.

5.Heat lost = Heat gained

5kh x 840JKg-1K-1 (110 - 50)0C = 2 kg x 4200JKg-1K-1 ( 500 - ) = 200C

6. Work done = 1/2Kx2 = 1/2 x 60N/M (0.5)2= 7.5j

7. Due to the unequal expansion between the metallic lid and glass. Metal expands more than glass for same temperature range.

8. Radiation is an electromagnetic wave while conduction involves particles which vibrate at lower speeds.

9. The speed is the same pressure is transmitted equally to all parts of the cylinder.

10. Alcohol - has a lower freezing point.

11. 150N x AC = F x 2AC

150 x AC = F

2AC

==> F = 75N

12. B - Velocity is highest - pressure lowest

13. i) DE - Body at rest

EF - Body accelerates in the opposite direction.

14. a) i) M bUb = MoUo = MbVo + MoVo

20 x 100 +90 x0= 20 V + 900V

1000100010001000

2 + 0 = V ( 0.02 + 0.9) V = 2 = 2.174m/s 92

(ii) KE = PE

1/2mv2 =Mgh

h = V2 = 2.174= 0.24m

2g2 x 10

(b) Change in velocity

(132 - 100)km/h = 32km/h

32 x 1000= 8.89 m/s

60 x 60

Acc = Change in velocity time taken

= 8.89= 0.019m/s

8 x 60

15. a) i) g.p.e = Mgh

= 60kg x 10m/s2 x 3= 1800J ii) Frictional force

1 / 3 x 600 = 200N

Work done = F x d= 200 x d

1800= 200d

1800 = d 200

d = 9m

Since AB = 7m, BC = 2m

iii) Max P.E. lost = Max K.E. gained

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232/1,232/2,232/3 physics

1800J = 1/2 mv2 ==> V2 = 3600

600

V =√= 7.75m/s

b) i) Percentage ratio of the work done on the load to work done by effort or MA x 100

VR

ii) Energy lost to overcome friction of moving part - Lifting parts of the machine.

15. a) i) 3 x 5 = 15 times ii) 2 x 3 = 6m

16. a) Archimedes principle talks about the relationship between an immersed or partially immersed object and the upthrust on it. Floatation talks about floating bodies only/partially immersed.

b) i) 0.6 - 0.28 = 0.32N

ii) 0.08= 81= 0.25

0.32324

c) Surface tension/Adhesive forces support water column or more capillarity in tube 2 than tube 1. - Surface tension is the same in both tubes and equal to the weight of water column supported. - Narrow tube has larger column to equate weigh to wider tube

- Volume of water in the bues same hence narrower tube column is higher d)

17. (a) Streamline flow where all the particles of the fluid move in the same direction at the same velocity at a particular point. - Turbulent - particles move with different velocities.

(b) Higher air speed at A and B reduces air pressure at A and B. - Higher atmospheric pressure between X and Y pushes paper outwards.

(c) A1V1 = A2V2

0.05 x 2.6 = 0.1x A2

A2 = 0.05 x 2.6= 1.3m2

0.1

= 13000cm2 Using r2 = A

r2 = 13000r2 = 13000

r2= 13000==> r2 = 4137

3.14

d = r x 2

= √413 x 2 = 128.65cm

d) i) Gas pressure

ii) 56mm Hg

iii) 760mmHg + 56mmHg = 816mmHg

18. (a) - Mass of the body

- Angular velocity

- Radius of circular path

(b) (i)

(ii) Fmin = MV2 - Mg

r

(iii) MV2 = Fmin + Mg r

0.4r2 = 6N + 4N ==> V2 = 25

V = 5m/s

iv) Fmax = MV2 + Mg ==> 0.4 x 52 + 0.4 x 10

r1

= 14N

c) - Rise in temperature give gas molecules more K.E. - Collisions between molecules increase

- Molecules move further apart in all directions.

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232/1,232/2,232/3 physics

KIGUMO SUB-COUNTY CLUSTER EXAM 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/2

PHYSICS

PAPER 2 (THEORY) MARKING SCHEME

1.

2.

3. Kinetic energy ---> Heat + X-rays

4. Maximum wavelength beyond which photoelectric effect does not occur.

5. Depolarizer

(a) 4 + 3 = 7

(b) I = 12 + 12 = 144 = 4.1143A

3535

C(4 ) = 5/12 x 4.1143 x 4 = 6.857V

7.X - North

Y - South

8.Time taken for half mass of given radioactive to decay

9.T = 0.0025 = 0.000625 s

4

f = 1/T = 1600Hz

10.

11.S = vt = 330 x 0.6 = 99m

22

12.

13. - Travel in straight line

- Charged

- Deflected by magnetic & electric fields any 2

14. a) - Strength of magnetic field

- Rate of change of magnetic flux linkage any 2

- Angle of inclination

- Number of turns in coil

b) i) P = VI

I = 50 000 = 5A

10 000

ii) Ns = Vs Np = 1000 x 10 000 = 10 000 turns

Np Vp1000

iii) Vs = Ip

Vp Is

1s = 10,000 x 5 = 50A

1000

c) Primary coil to minimize resistance

rays with arrows position of F

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232/1,232/2,232/3 physics

15. a) Ration of sine of angle of incidence to sine of angle of refraction for a given pair of media.

b) n=1=1

Sin CSin C 43.20= 1.461

c) Adjustment of focal length of eye lens so as to focus images of objects of different distances on retina.

d)

Use convex lens to correct

i) Long sightedness (Hypermetropia)

e)1 =-1 -1 =-1 - 2 =-3

V40204040

V = -13.33cm

16. a) Electrons dislodged due to radiation (photo)

b) - Intensity of incident radiation

- Energy of radiationany 2

- Type of metal

c) i) Work done on stopping electrons from leaving cathode.

ii) Gradient = h/e .: h = Gradient x e

Gradient =3 - 0= 4.0 x 10-15

(12 - 4.5) x 10+14

.: h = 4.0 x 10 - 15 x 1.6 x 10-19 = 6.4 x 10-34js Wo = y Intercept .: Wo = y - Intercept x e e

or w = hfo = 6.4 x 10-34 x 4.5 x 1014 = 2.88 x 10-19J

1.8ev

17. a) Distintegration of unstable nucleus

b) i) Beta () particles

ii) Alpha ( ) particles

c) X - alpha ( ) particles Y - Gamma rays

Z - Beta () particles

d) H - Beta ( ) particles b - 82

c - 206

18. a) A - Grid

B - Anode

b) C - Vertically deflect the beam

D - Horizontally defect the beam

c) Reduce collision with air molecules in the tube.

d) ( ( 4 x 40) + (6 x 100))5 = 3.8kwh per day

1000

380 x 30 = 114 kwh per minute Cost (114 x 5.5) + 150 = sh 777

e) i) A - Cathode

B - Anode

ii) I = ne .: N = I/e = 0.01 x 1019 = 6.25 x 1016 electrons

1.6

iii) ev = 1/2 mev2

.:√

1

31

= 7.262 x 107 m/s

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232/1,232/2,232/3 physics

KIGUMO SUB-COUNTY CLUSTER EXAM 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/3

PHYSICS

PAPER 3 (PRACTICAL) MARKING SCHEME QUESTION 1

C (iv)

(NB - These values are only a guide. They are subject to change depending on the type of spring used. Recommended to use the student’s values)

All tables values correct9 marks

d) i) Scale

Axis labelled with quantities and units Plotting

Straight line (positive gradient)

d) ii) Correct substitution Correct answer

iii) Correct T2 intercept Substitution

Correct answer

b) ii) Slope of the graph 1.44 - 1.06 s2

30 - 20cm

= 0.038s2/cm iii) 4 p2 = 0.38 b

b =4p2

0.038= 1039

QUESTION 2

d) 600

i) Values of d decrease, then increase. Mark the trend. (8 marks)

Scale

Axis labelled Plotting

Curve

(h) Read from the graph the minimum value for d (300)

(p) Numerator and evaluated

Denominator and evaluated Substitution

Accuracy, n = 1.5

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232/1,232/2,232/3 physics

KIRINYAGA WEST SUB-COUNTY EFFECTIVE “40” EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS

PAPER 1 (THEORY)

1.The figure below shows the reading obtained on a vernier caliper that has a zero error of -0.12cm, when measuring the

diameter of a metal ball

Determine the diameter of a metal ball.(2mks)

2. The length of mercury thread in a thermometer at 00C is 4cm, while the length at 1000C is 20cm. What is the temperature

when the length is 12cm?(2mks)

3.The figure below show a glass tumbler filled with water to the brim, a card made of manila paper is then placed on top of a

glass tumbler as shown in figure 1.

Tumbler filled with waterTumbler filled with water

uprightupside down

While supporting the card with one hand the glass tumbler is carefully inverted as shown in figure (ii). It is observed that

the card remains in place without being support. Explain this observation.(2mks)

4. A spring has a spring constant of 40N/m, if the extension on the spring is 6.0cm, determine the tension on the spring. (2mks)

5. When loosening a nut mechanics prefer to use a long spanner than to use a short one. Explain why?(2mks)

6. A bullet of mass 10g is fired at 200m/s from a pistol of mass 1.0kg. What is the recoil velocity of the piston.(2mks)

7. Some candle wax is placed at one end of each of the aluminium rods with different thickness. The rods are than heated in a

candle flame as shown in the figure below.

State and explain the observation made.(2mks)

8.An oil drop spreads on the surface of water to a diameter of 14cm. If 50 such drops occupy 0.0035cm3. Estimate the diameter

of the oil molecule.(2mks)

9. A uniform metre rule is balanced as shown below.

Find the weight of the metre rule.(2mks)

10. State the role of the volatile liquid in a refrigerator.(1mk)

11. A body of mass 5kg is placed at a height 20m above the ground. Calculate the velocity at which it strikes the ground when it

is released to fall freely.(2mks)

12. Sketch a velocity-time graph for an object thrown vertically upwards until it gets back to it’s back to it’s initial position.

(2mks)

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13. A liquid flows along a horizontal pipe of cross-section area of 20cm2 at a speed of 3.0m/s. If the speed increases to 9.0m/s

when it reaches a narrow section, determine the cross-section area of the narrow section.(2mks)

14.(a) An object immersed in water feels lighter than when in air. Explain the observation.(2mks)

(b) The weight of a solid in air is 6.0N. When it is fully immersed in a liquid of density 950Kg/m3, Its weight is 5.05N.

Determine

i) the upthrust in the liquid.(1mk)

ii) the volume of the solid.(2mks)

(c) In an experiment with a metal cube, the following results were obtained;-

Weight of the cube in air0.6N

Weight of the cube completely immersed in water0.54N

Weight of the cube completely immersed in liquid0.56N

Calculate the relative density of the liquid(3mks)

(d) i) State how pressure of a liquid varies as its speed increases.(1mk)

ii) 500cm3 of fluid flows out of a tube in 25 seconds. If the inner diameter of the tube is 1.4cm, what is the average

velocity of the fluid in the tube?(2mks)

15. (a) Define the term efficiency of a machine.(1mk)

b) The figure below show a drum of mass 80kg being rolled up a plane inclined at 300 to the horizontal. The force applied is

420N and the distance moved by the drum along the plane is 5.0m.

Calculate :

(i) The work done by the effort(2mks)

(ii) the work done in rising the drum.(2mks)

(iii) the efficiency of the inclined plane as a machine.(2mks)

(c) A stone is released from the top of a cliff 45m high with a horizontal velocity of 20m/s as shown inthe figure

below.

Calculate:-

(i) the time it takes to hit the water surface.(2mks)

(ii) the velocity with which it hits the water.(2mks)

(iii) the horizontal distance moved R (1mk)

16. (a) What is meant by absolute zero temperature.(1mk)

(b) The figure below shows a set up to investigate the relationship between volume and temperature ofa certain gas.

(i) State two factors that are kept constant in order to determine the relationship.(2mks)

(ii) Explain the function of the sulphuric acid.(1mk)

(iii) State the law being investigated in the experiment.(1mk)

(iv) The volume of the gas at 200C was found to be 100cm3. What would be its volume at 400C.

(2mks)

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(c) A mixture consist of 40cm3 of water and 60cm3 of liquid x. If the density of water and liquid x are1.0g/cm3and

0.8g/cm3 respectively, calculate the density of the mixture.(3mks)

17. (a) Name two forces acting on a racing car, when racing along curved road.(2mks)

(b) A particle on a wheel moves through an angle of 600 in 0.2 seconds, if the radius of the wheel is

30cm determine the

(i) Angular velocity of the wheel.(2mks)

(ii) Linear speed of the particle.(2mks)

(c) The figure below shows two trolleys of mass 5.0kg and 3.0kg travelling towards each other at 0.60m/s and 0.5m/s

respectively.

If the trolleys fuse on collision. Calculate the velocity of the combined trolleys.(2mks)

(ii) A goalkeeper catches a ball of mass 450g moving with a velocity of 20m/s. Determine

(I) momentum of the ball.(2mks)

(II) the average force applied by the goalkeeper hands to stop the ball in 0.4 seconds.(2mks)

18. (a) Define the term specific latent heat of fusion.(1mk)

(b) The figure below show an incomplete set up that can be used in an experiment to determine the specific latent heat of

fusion of ice by electric method.

i) Complete the diagram by inserting the missing components for the experiment to work.(2mks)

ii) The following readings were noted after the heater was switched on for 10 minutes.

Mass of the beaker150g

Mass of beaker + melted ice200g

Current through the heater2A

Voltage across the heater15V

Determine the

(I) Energy supplied by the heater in the 10 minutes.(2mks)

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232/1,232/2,232/3 physics

KIRINYAGA WEST SUB-COUNTY EFFECTIVE “40” EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/2

PHYSICS

PAPER 2 (THEORY)

1.A lady holds a large concave mirror of focal length80cm, 60cm from her face. State two characteristics of her image in the

mirror.(2mks)

2. Figure 1 below shows a wire XY at right angles to a magnetic field. XY is part of circuit containing a galvanometer.

Figure 1

When XY is moved the current flows in the direction shown. State the direction in which XY is moved.(1mk)

3.State two distinctions between the way sound waves and electromagnetic waves are transmitted.(2mks)

4.A soldier standing some distance from a wall blows a whistle and hears its echo 3.6 seconds later. How far is the wall from

the soldier?

(Speed of sound in air is 360m/s)(3mks)

5.A ray of light incident on the surface of a glass prism is observed to behave as represented in figure 2 below.

Figure 2

Explain this observation.(3mks)

6.Figure 3 shows a cross-section of an optical fibre made of two types of glass A and B. The refractive index of B is lower than

that of A.

Figure 3

A ray of light enters the optical fibre at P and emerges from Q.

(i) Sketch the path of the ray through the fibre.(1mk)

(ii) State the reason why light travels through the fibre as in (i) above.(1mk)

7.In large current circuits large resistors in parallel are preferred to low resistors in series. Explain.(2mks)

8.A wire is stretched between two fixed points such that when it is plucked, it produces sound. Explain why the pitch of the

sound produced may become lower when the temperature of the surrounding rises.(2mks)

9.Figure 4 shows water waves incident on a shallow region of the shape shown with dotted line

Figure 4

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On the same diagram, sketch the wave pattern in and beyond the shallow region.(1mk)

10. Figure 5 shows two charged identical conducting spheres on insulating stands. Each cross represents a charge. The spheres

are briefly brought into contact.

Figure 5

Sketch in the space provided the diagrams of the spheres showing charge distribution after separating.(2mks)

11. Figure 6 shows three capacitors connected between two points A and B.

Figure 6

Determine the capacitance across AB.(3mks)

12. State two factors other than the speed of rotation that affect the magnitude of the induced e.m.f. generated.(2mks)

13. Figure 7 shows a simple generator. The coils are rotated in the anticlockwise direction as shown.

Figure 7

(a) Name the parts labelled P and Q.(2mks)

(b) Indicate using arrow on the figure the direction of the induced current as the coil passes the

position shown.(1mk)

(c) State two ways of increasing the magnitude of the induced current in this type of generator.(2mks)

(d) On the axis provided, sketch the graph on the induced e.m.f. with time.(2mks)

(e) The section marked XY is cut off and a diode inserted. On the axis provided, sketch the graph of

p.d. across the resistor R, against time.(1mk)

14. Figure 8 shows a section of a house wiring system.

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232/1,232/2,232/3 physics

a) Name the

(i) circuit labelled P(1mk)

(ii) terminals labelled X and Y(2mks)

(b) i) State the purpose of R in the circuit.(1mk)

(ii) Give a reason why R is connected to Y but not to X.(1mk)

(c) Determine the cost of using the electric iron rated 150W for a total of 30 hours given that the cost of electricity per

KWh is Ksh 8.(1mk)

15. Figure 9 below shows a cathode ray tube in which a beam of electrons is cast on the screen

Figure 9

(a) State how the electrons are produced in the tube.(1mk)

(b) State how the electron beam is detected.(1mk)

(c) State the reason for having a variable potential difference (p.d) at the:

(i) Grid(1mk)

(ii) Anodes(1mk)

(d) Figure 10 shows the waveform of a signal applied at the Y- plates of an oscilloscope whose time-base is switched to the scale of 2 milliseconds per centimetre.

Figure 10

Determine

(i) the period of the signal(2mks)

(ii) the frequency of the signal.(3mks)

16.(a) State two factors that determine the speed of photoelectrons emitted by a metal surface.(2mks)

(b) In an experiment using a photocell, a u.v. light of varying frequency but constant intensity was

made to strike a metal surface. The maximum kinetic energy (k.e. max) of photoelectrons for each frequency, f, was measured. The graph shows how KE max varies with f.

Given that KE max = h f - O, determine the values of h and O from the graph.

h =(3mks)

O=(3mks)

(c) Light of frequency 5.5 x 1014Hz is made to strike a surface whose work function is 2.5 eV. Show that photoelectric effect

will not take place.(3mks)

17. (a) The initial mass of a radioactive substance is 20g. The substance has a half-life of 5 years. Determine the mass remaining

after 20 years.(2mks)

(b) When a radiation was released into a diffusion cloud chamber, short thick track were observed. State with a reason, the

type of radiation that was detected.(2mks)

(c) Radium undergoes radioactive decay by emitting an alpha particle to form a daughter nuclide Q as in the reaction.

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232/1,232/2,232/3 physics

Determine the values of

(i) x(1mk)

(ii) y (1mk)

18. Figure 11 below shows a alternating current (a.c.) connected across a diode D and a resistor R.

Figure 11

(a) On the axis provided sketch the output as observed in C.R.O. connected across R.(1mk)

(b) When a germanium crystal is doped with arsenic, it becomes an N-type semiconductor. Explain how the change

occurs. (Number of electrons in the outmost shell for germanium 4, Arsenic = 5)(2mks)

(c) The graph shows current against voltage for a semiconductor diode.

In the space provided, draw a circuit diagram that may be used to obtain values needed to draw the above graph. (2mks)

19. Figure 12 shows an electrical circuit including three switches, S 1, S2, and S3 and three identical lamps L1, L2 and L3. A

constant potential difference is applied across X and Y.

(i) Other than L1, state the lamp that will light when S1 and S2 are closed.

(ii) How does the brightness in L1 in (i) above compare with it’s brightness when all the switches are closed.(1mk)

(iii) Explain the observation in (ii) above.(1mk)

20. You are provided with the following apparatus to determine the focal length of a lens. A biconvex lens and lens holder

A lit candle

A white screen A metre rule

(a) State two measurements that you would take.(2mks)

(b) Explain how the measurements in (a) above would be used to determine the focal length of the

lens.(2mks)

(c) Describe the procedure you would follow in determining the focal length of the above lens.(2mks)

(d) Draw a diagram to show how you would arrange the above apparatus to determine the focal

length of the lens.(1mk)

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232/1,232/2,232/3 physics

KIRINYAGA WEST SUB-COUNTY EFFECTIVE “40” EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/3

PHYSICS

CONFIDENTIAL Question 1

-Voltmeter which can measure to up 5 volts

-Two new dry cells

-A cell holder that can connect in series

-A resistor labelled R of 3.9

-A micrometer screw gauge (can be shared).

-A nichrome wire SWG 28 mounted on a mm scale of length 1m

-Six connecting wires all least four with crocodile clips

-A switch

-A biconvex lens labelled L (Focal length 10cm)

-A full candle

-A metre rule

-A piece of plasticine

Question II

-A spiral spring - that support 250g

-Five 50g masses or one 50g mass and two 100g masses

-A complete retort stand

-Two wooden pieces

-A half metre rule or a metre rule

-A weighing balance (can be shared)

KIRINYAGA WEST SUB-COUNTY EFFECTIVE “40” EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/3

PHYSICS

PAPER 3 (PRACTICAL) QUESTION 1

PART 1

1.You are provided with the following

- A voltmeter

- Two dry cells and a cell holder - A switch

- A resistor labelled R

- A wire mounted on a mm scale and labelled G - A micrometer screw gauge (to the shared) - Six connecting wires with six crocodile clips

Proceed as follows

a)Record the length L0 of the wire labelled G

L0 =. (1mk)

Use the micrometer screw gauge provided to measure the diameter of the wire labelled G at two different points and

determine the average diameter, d

The diameter d1 = .....mm, d2 ..... mm(1mk)

Average diameter d = ..... m(1mk)

Determine the radius of the wire in metres.

Radius r = .... m

b) Set up the apparatus as shown in the circuit diagram in figure 1 shown below.

Figure 1

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232/1,232/2,232/3 physics

i) Use the voltmeter provided to measure the p.d. VR across R and p.d VG across G when the

switch is closed.

VR = ..... volts(1mk)

VG = ...... volts(1mk)

Open the switch

ii) Use the value of R provided and the value of VR in b(i) above to calculate the current I flowing

through R when the switch was closed.

I = ...... Amperes(1mk)

iii) Determine the constant H given that

H = 100VG

1 x L0

H = ...... (1mk)

QUESTION 1 PART 2

1. You are provided with the following apparatus: - A biconvex lens labelled L

- A candle

- A lens holder - A metre rule

- A piece of plasticine

Proceed as follows

c) Arrange the candle, lens, screen and metre rule as shown. Ensure that the flame of the candle is at the same level as the centre of the lens, L. This may be done by raising the candle with a piece of plasticine as it gets shorter.

d) With the lens placed 20cm from the candle, adjust the position of the screen till a sharp image of the candle is formed on it. Read and record the value of V.

e) Increase U in steps of 5cm and obtain the corresponding values of V. Complete the table.

(5 marks)

(i) Plot a graph of object distance, u (y - axis) aganist the ratio U/V

(ii) Determine the slope, S of the graph.(2mks)

QUESTION 2

You are provided with the following:

• A spiral spring

• Five 50g masses or one 50g mass and two 100g masses

• A complete retort stand

• Two wooden pieces

• A half metre rule or a metre rule

• A weighing balance

Proceed as follows:

(a) Clamp the spiral spring and a half meter rule onto the retort stand.

Record the position of the pointer when no mass is attached to the end of the spiral spring.

Reading of the pointer ..... cm(1mk)

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232/1,232/2,232/3 physics

b) Suspend the 50g mass to the spring and displace it slightly downwards and measure the time for 20 oscillations. Repeat the

procedure for 100g, 150g, 200g and 250g masses and record your results in the table below.(6mks)

c) Plot a graph of T2 against extension, e

d) Find the gradient, s of your graph(5mks)

e) Given that the relationship bwtween R and e is

T2 = 42 e + 4 m

gk(2mks)

Find the value of ‘g’. (take = 3.142)(2mks)

f) Using the weighing balance, measure and record the mass, m, of the spiral spring.

Mass of spring = .... kg(1mk)

g) Determine the vertical intercept and hence find the value of ‘k’(3mks)

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232/1,232/2,232/3 physics

KIRINYAGA WEST SUB-COUNTY EFFECTIVE “40” EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS

PAPER 1 (THEORY) MARKING SCHEME

1. Reading = 2.6 + (6 x 0.01) = 2.66cm Diameter of ball = 2.66 + 0.12

= 2.78cm

2.1000 = (2- 0 4) = 16cm

1cm = 1000C 16

12cm = 1000C x 12 = 750C 16

3. The atmospheric pressure is greater than the pressure due to the water in the glass tumbler. Atmospheric pressure acts in all direction.

4. F = Ke

F = 40 x 0.06 F = 2.4N

5. A long spanner exerts a larger moment of force for the same amount of force.

6. Momentum before firing = momentum after firing

1.0 x 0 + 0.01 x 0 = 1.0v + 0.1 x 200

V = - 0.01 x 200

1.0

V = -2m/s

7. - Candle wax on thicker road falls faster compared to the thin rod - Thicker conductor conducts heat faster than thin conductor.

8. Volume of patch = Volume of drop

r2d = 0.035

50

22 x 7 x 7 x d = 0.0035 = 0.00007

750

d = 0.00007 22 x 7

d = 4.5 x 10-7cm

9. Clockwise moment = anticlockwise movement 30 x w = 20 x 5.0

w = 20 x 5 = 3.333N 30

10. Volatile liquid removes heat when it vaporizes and takes in latent heat.

11. V2 = u2 + 2gs

V2 = 0 + 2 x 10 x 20 V = √4

V = 20m/s

12.

13. a 1v1 = a2v2

20 x 3.0 = 9.0 x a2 a2 = 20 x 3.0

9.0

a2 = 6.67cm2

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232/1,232/2,232/3 physics

14. (a) It experiences an upthrust force which tend to push the weight of the object upwards.

(b) (i) Upthrust = 6.0 - 5.05 = 0.95N

(ii) Upthrust = Veg

0.95 = V x 950 x 10

V =0.95

950 x 10

V = 0.0001m3

(c) R.d = Upthrust in liquid L

Upthrust in water

R.d. = 0.6 - 0.56

0.6- 0.54

R.d = 0.667

(d) (i) Fluid pressure reduces as the speed of the fluid increases. (ii) Volume flow rate = Area x velocity

500 = 22 x 0.7 x 0.7 x V

257

V =20= 12.99cm/s

22 x 0.1 x 0.7

15. (a) Efficiency is the ratio of work output to work input expressed as a percentage

or efficiency= Work output x 100%

Work input

Efficiency = M.A. x 100%

V.R.

(b) i) Work input = F x d

= 420 x 5 = 2100J

ii) Work output = mgh

= 80 x 10 x 5 Sin 300 = 2000J

iii) Efficiency = Work output x 100%

work input = 2000 x 100 2100

= 95.24%

(c) i) S = ut + 1/2gt2

4s = 0 + 1/2 x 10 x t2

t =9 = 3s

ii) V = u + gt

V = 0 + 10 x 3 V = 30m/s

iii) R = ut

R = 20 x 3 = 60m

16. (a) It is lowest temperature a gas can fall to (-2730C)

(b) i) Mass of the gas, the pressure of the gas. ii) To dry the gas

iii) Charle’s law, the volume of fixed mass of gas is directly proportional to its absolute temperature at constant pressure.

iv) V1 = V2

T1T2

100= V2

293313

V2 = 100 x 313 = 106.83cm3

293

c) Total volume = 60 + 40 = 100cm3 Mass of water = ev = 1 x 40 = 40g Mass liquid x = 0.8 x 60 = 48g

Total mass = 40 + 48 = 88g e of mixture = total mass

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232/1,232/2,232/3 physics

total volume

= 88

100

= 0.88g/cm3

17. (a) - Friction between the wheel’s and the road- Centripetal force

- Normal reaction on the wheel of the car

(b) i) = O

t

= 60 x 2 360 x 0.2

= 5.237 rad/s ii) V = wr

V = 5.237 x 0.3 = 1.571m/s

(c) i) Total initial momentum = Total Final momentum or m 1u1 + m2u2 = (m1 + m2) V

(5 x 0.6 + (-3 x 0.5) = (5 + 3)V V = 1.5 = 0.1875m/s

8

(ii) (I) Momentum = mv = 0.45 x 20

= 9kgms-1

(II) Ft = change in momentum F x 0.4 = 0 - 9

F = -9 = -22.5 N

0.4

18. (a) Is the quantity of heat required to convert a unit mass of substance from solid to liquid state without change in temperature.

(b) (i)

(ii) E = VIt

E= 15 x 2 x 10 x 60 E = 18000J

(iii) MLf = VIt

0.05 x Lf = 18000

Lf = 18000

0.05

= 3.6 x 105J/Kg

(c) Q = MC O

Q = 0.05 x 450 x (80 - 25) = 1237.5J

Rules on marking numerical questions

Formula1mk

Substitution1mk

Answer 1mk

For question with two marks

1st mark is at formula or correct substitution The answer mark

Correct value with correct unit,1mk

Correct value with no unit1/2mk

Correct answer with wrong unit, 0mk

Correct answer with no working

no mark

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232/1,232/2,232/3 physics

KIRINYAGA WEST SUB-COUNTY EFFECTIVE “40” EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/2

PHYSICS

PAPER 2 (THEORY) MARKING SCHEME

1.- Virtual

- Erect or as upright as the object - Magnified

2. Downwards

3. Transmission of sound waves requires a material medium but no material medium is required for electromagnetic waves.

4. V = 2d

t

360m/s = 2d

3.6

d = 360 x 3.6 2

d = 648m

5. White light consists of several colours, each with a different wavelength. Every colour therefore travels with a different velocity in glass, so each colour is deviated differently causing dispersion.

6. (i)

(ii) Light undergoes total internal reflection.

7. Parallel resistors allow diversion of current, hence will not overheat.

8. The wire expands or becomes longer and its tension reduces and this lowers the frequency hence the pitch. 9.

10.

11.3F + 4F = 7F

1 = 1+ 1

C27

1 = 7 + 2 =9

C1414

C = 14 9

C = 1.56 F.

12. - Number of turns or coils of the wire - Strength of the magnetic field

- Angle of inclination between the wire and the magnetic field.

13. (a) P = Slip rings

Q = Carbon brushes

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232/1,232/2,232/3 physics

(b)

(c) - Increasing the number of turns - Increasing the speed of rotation - Using stronger magnets

(d)

(e)

14. (a) (i) P = Main Ring Circuit (ii) X = Neutral wire

Y = Live wire

(b) (i) To guard against excess current

(ii) To ensure that when R breaks, the appliance does not remain live,

c) Cost of electricity = 1.5Kw x 30h x 8 sh= Ksh 360

15. (a) Thermionic emission i.e. the filament heats up the cathode

(b) A spot is seen on the screen

(c) (i) To focus the electrons towards the screen

(ii) To accelerate the electrons toward the screen

(d) i) One wave = 2 x 2ms = 4ms

= 4 x 10-3s = 0.004s

ii) f=1=1

T0.004

= 250Hz

16. (a) - Frequency of the incident light

- Work function of the metal surface

(b) From k.e. = hf - O

then h = slope

Slope =ke= (9.3 - 6) x 10-19

f(2.5 - 2) x 10-15

= 3.3 x 10-19

0.5 x 1015

h = 6.6 x 10-34Js From k.e. = hf - O

k.e. = hf - hf o

then hfo = y - intercept = work function

so

O = hfo = 6.6 x 10-34 x 1.1 x 1015

= 7.26 x 10-19J

c) Max k.e. = hfo

= 6.6 x 10-34 x 5.5 x 1014 = 36.3 x 10-20

= 3.63 x 10 -19J

In eV = 3.63 x 10-19= 2.27 eV

1.6 x 10-19

No photoelectric will take place since hfo is less than the work function ie ( hfo

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232/1,232/2,232/3 physics

17. (a) After every 5 years the half the mass decays ie 20g ----> 10g ----> 5g---- > 2.5g ---->1.15g OR

N = No(1/2)T/t

= 20 (1/2)20/5 = 20 (1/2)4 = 20 (1/16) = 20/16 = 1.25g

b) Alpha () radiation

This radiation has a short range with intense ionisation hence thick tracks.

i) x = 222

y = 86

18. (a)

(b) Four electrons from arsenic bond covalently with germanium leaving a free electron that is responsible conductivity.

(c)

19. (a) (i) L2

(ii) L1 is brighter

iii) When the switches are all closed the total resistance is less.

20. (a) Distance of the candle from the lens or object distance (u)

- Distance of the screen from the lens or image distance (v)

(b) Draw a graph of magnification against image distance then get the reciprocal of the gradient (slope) as the focal length.

(c) - Candle is placed at a certain distance from the lens.

- The distance between the screen and the lens is adjusted until a sharp image is focused on the screen.

(d)

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232/1,232/2,232/3 physics

KIRINYAGA WEST SUB-COUNTY EFFECTIVE “40” EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/3

PHYSICS

MARKING SCHEME

1.(a) L0 = 100cm or 1m

Diameter d1 = 0.26mm

Diameter d2 = 0.26mm

Average diameter d = 0.26 + 0.26

2

= 0.26mm = 0.00026m

Radius r = 0.00026 = 0.00013 m

2

(b) VR = 2.1 volts+ 0.21mk

VG = 2.4 volts + 0.21mk

I = V = 2.1 = 0.54A

R3.9

ii) Determination of constant H

H = 100VG

I x L0

= 100 x 2.4 = 444.4 1m

0.54 x 1

Slope ‘S’ = y

x

=45 - 20

2.459- 0.7142

=25

1.7448= 14.3283cm

d) Gradient = y

x

Correct intervals from

Candidates graph-(1 mk)

Correct evaluation with

Units to 3 s.f. -(1mk)

( units S2/cm)

4 2= Slope - 1/2mk correct substitution

gfor & slope =

Correct evaluation -1mk)

Mass of spring in kg - must be to five decimal place Vertical intercept - Must be correct from candidates graph - 1mk

42 = Vertical intercept -K

Correct substitution for

and vertical intercept -

Page | 214

232/1,232/2,232/3 physics

GUCHA SOUTH EVALUATION TEST (GSET) 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS

PAPER 1 (THEORY)

1. The figure 1 below shows a micrometer screw gauge that has a zero error of +0.02. State the actual reading of the micrometer

screw gauge.(1 mark)

25

20

15

Fig 1

2. In the figure 2, below, U-tube contains two immiscible liquids P and Q. If the density of Q is 900kg/m³ and that of P is 1200kg

/ m³, Calculate the height of liquid Q.(3 marks)

P

Q

h

9cm

3cm

Fig 2

3. Distinguish between latent heat of fusion and specific latent heat of fusion of a substance.(1 mark)

4. A mass of 8kg is whirled round in a horizontal circle using a rope that is 80cm long, it is takes 2½ circles in 1 second, calculate

the tension the rope experiences.(3 marks)

5. Fig 3 shows a solid cylinder standing on a horizontal surface. The cylinder is in stable equilibrium.

Fig 3

On the horizontal space provided, sketch the cylinder in neutral equilibrium(1 mark)

6. In terms of intermolecular forces, explain the difference between liquid and gaseous state.

7. (a)Under what conditions can a feather and a stone released from the same height land on the ground at the same time?

(b) On the axis on figure 4 below, sketch displacement time graph for accelerating body.(1 mark)

Displacement

(m)

Time (s)

Fig 4

8. A spring extends by 4cm when a load of 10N is suspended from it. Six similar springs are used in the system shown in figure

5. Determine the total extension.(3 marks)

50 N

Fig 5

9.Explain how heat loss by radiation is minimized in a vacuum flask.(1 mark)

10. A pipe of radius 2mm is connected to another pipe of radius 6mm. If water flows in the narrow pipe at a speed of 3m/s,

determine the speed of water in the wider pipe.(3 marks)

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232/1,232/2,232/3 physics

Fig 6 shows the features of a dry cell (leclanche). Using the information in the figure to answer questions 11 and 12.

A

D

C

Fig 6B

11. State the polarities of the parts labelled A and B.(1 mark)

12. Name the chemical substances in the parts labelled C and D.(2 marks)

13. The light uniform bar in figure 7 is in equilibrium. The two beakers A and B contain water at the same temperature. The two blocks are made of the same material.

Water

Water

AB

Fig 7

If the temperature of the water in beaker A is now raised, explain why the beam tips to side A. Assume the solid does not

expand.(2 marks)

14. A stone thrown vertically upwards from the base of a mountain with an initial velocity of 100m/s. The stone just stopped as

the apex and came back. Another boy projected a stone horizontally from the top of the mountain. Calculate:

(a) Height of the mountain.(2 marks)

(b) Time taken for the stone to follow the trajectory.(2 marks)

(c) The range if the horizontal velocity is 20m/s.(2 marks)

(d) Calculate the impulse of force produced when a table is pulled for 3 seconds by a constant force of 10N towards the right

and then for 2 seconds by a constant force of 20N towards the left.(2 marks)

(e)The figure 8 below shows a tape from a trolley accelerating at 5m/s and the timer is vibrating at 100HZ.

ABTape

0.125

Fig 8

(i) Change in velocity from A to B.(2 marks)

(ii) The final velocity of the trolley.(2 marks)

15. (a) Two gear-wheel have 80 teeth and 20 teeth and they lock with each other. They are fastened on axles of equal diameter

such that equal weight of 150N attached to the string around the axle will just raise 450N on the other axles. Calculate

(i) The mechanical advantage.(2 marks)

(ii) The velocity ratio.(2 marks)

(iii) The efficiency of the machine.(2 marks)

(b)(i) A loudspeaker is a transducer. Explain.(1 mark)

(ii) Explain the energy change that occur when a man climbs the mountain.(1 mark)

(c) Calculate the total power in lifting 0.2kg of metal cane containing 2000cm³ of ice onto a lorry as shown below within 4S.

Density of ice is 0.9g/cm³(3 marks)

open

Closed

3m

2m

16.(a) What is meant by term specific latent heat of vaporization?(1 mark)

(b) In an experiment to determine the specific latent heat of vapourisation of water, steam at 100°C was passed into water contained in a well lagged copper calorimeter. The following measurements were made :-

Mass of calorimeter = 50g

Initial mass of water 70g

Initial temperature of water = 5°C

Final mass of water + Calorimeter + condensed steam = 123g Final temperature of mixture = 30°C

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232/1,232/2,232/3 physics

Specific heat capacity of water = 4200jKg-1k-1 Specific heat capacity of copper = 392jKg-1k-1

I. Determine the:-

(i) Mass of condensed steam.(1 mark)

(ii) Heat gained by water and calorimeter.(2 marks)

II. Given that L is the specific latent heat of vaporization of steam.

(i) Write an expression for the heat given out by steam.(1 mark)

(ii) Determine the value of L.(3 marks)

III. The specific latent heat of fusion of ice is 334J/g. Explain what this means.(1 mark)

IV. The specific heat capacity of pure water is 4200J/ kg /k while that of sea water is 3900J/kg/k. Which of the two

liquids is the most appropriate to be used in cooling systems. Give a reason.(2 marks)

17. (a) State the law of floatation.(1 mark)

(b)The figure 10 below represents a sphere 0.012m³ volume and mass 5kg floating between two liquids A and B such that 2/3 of its volume is in liquid A. Density of liquid B is 800kg/m³

(Take g = 10N/kg).

Liquid A

Liquid B

Fig 10

Determine

(i) Weight of liquid B displacement.(2 marks)

(ii) Weight of liquid A displaced.(1 mark)

c) The sphere is now anchored at the base of the container that ¼ of its volume is in liquid A. Find the tension in the string.

(3 marks)

d) Explain why a hydrometer has the following:

(i) Lead shots in the bulb.(1 mark)

(ii) Narrow stem.(1 mark)

18.( a) State Newton's second law of motion.(1 mark)

(b) A wooden block resting on a horizontal bench is given an initial velocity, U, so that it slides on the bench surface for a

distance, d, before coming to stop. The values of d were measured and recorded for various values of initial velocity.

Figure 11 shows the graph U² against d.

U²(m/s)²

150

100

50

051015d(m)2025

Fig 11

(i) Calculate the slope S of the graph.(3 marks)

(ii) Given that U² = 20kd, where k is a constant for the bench surface, determine the value of k from the graph.(2 marks)

(iii) State how the value of K would be affected by a change in the roughness of the bench surface.(1 mark)

(c) A care of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting

point.(3 marks)

Page | 217

232/1,232/2,232/3 physics

GUCHA SOUTH EVALUATION TEST (GSET) 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/2

PHYSICS

PAPER 2 (THEORY)

1. The figure 1 below shows the image I behind a mirror M

M

Eye

I

Fig 1

Using ray diagram construction, locate the position of the object.(2 marks)

2. An electromagnet is made by winding insulated copper wire on an iron core. State two changes that could be made to increase

the strength of the electromagnet.(2 marks)

3. The diagram below shows an electrical appliance connected to the mains.

Fuse

A

Casing

Heating

Belement

Fig 2

I. Name the colour codes for leads A and B(2 marks)

II. What is the purpose of the fuse.(1 mark)

4. State one differences between an image formed by a plane mirror and that observed through a pinhole camera. (1 mark)

5. Figure 3 shows a combination of capacitors across a power supply.

100 f

100 f

200 f400 f

20V

Fig 3

Determine the energy stored in the system of capacitors.(3 marks)

6. An electric bulb is rated 75W, 240V. Determine the resistance of the bulb.(2 marks)

7. Figure 4 shows how the displacement varies with time for a certain wave.

0.4

0.2

0.51.01.52.02.5

-0.2

Time(minutes)

-0.4

Fig 4

Determine the frequency of the wave.(2 marks)

8. In an X-rays tube it is observed that the intensity of X-rays increases when the potential difference across the filament is

increased. Explain this observation.(2 marks)

9. Explain why a p-n junction diode will conduct when connected in forward bias.(1 mark)

10. Give a reason why lecture theatre halls are covered with soft perforated materials.(1 mark)

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232/1,232/2,232/3 physics

11. Figure 5 shows a magnet being moved towards a stationary solenoid. It is observed that a current flows through the circuit in a direction Q to P.

NS

Motion

PQ

Fig 5

Explain :

(i) How the current is produced.(2 marks)

(ii) Why the current flows from Q to P.(1 mark)

12. Figure 6 shows an object placed infront of a prism as shown.

eye

45°45°

Using two rays show the image of the object as observed by an observer at E.(2 marks)

13. Table 1 below shows the radiations and their respective frequencies.

Type of radiationYellow lightGamma raysRadio wavesMicro waves

Frequency1 × 1051 × 10221 × 1061 × 1011

Arrange the radiations in the order of increasing energy.(1 mark)

14. (a) Figure 7 shows a connection of the three pin plug.

Brown

Green/Blue

Yellow

(i) Identify two mistakes in this wiring.(2 marks)

(ii) What would happen if this plug was connected to the mains of the socket?(1 mark)

(iii) State two reasons why the earth pin is normally longer than the other two pins.(2 marks)

(b) A house has five rooms with 240V, 60W bulbs. If the bulbs are switched on from 7.00pm to 10.30pm

(i) Calculate the power consumed per day in kilowatt-hours.(3 marks)

(ii) Find the cost per week for lighting these rooms at Kshs 670 per unit.(2 marks)

15.(a) (i) Distinguish between threshold frequency and threshold wavelength.(1 mark)

(ii) The maximum wavelength required to cause photoelectric emission on a metal surface is 8.0 × 10-7m. The metal

surface is irradiated with light of frequency 8.5 × 1014HZ. (Take h = 6.62 × 10-34Js, C=3.0 ×108ms-1)

Determine

I. The threshold frequency.(2 marks)

II. Maximum kinetic energy of the electrons.(3 marks)

Page | 219

(The equation of the graph is given by)

232/1,232/2,232/3 physics

b) The graph below in figure 7 shows the variation of stopping potential Vs, against reciprocal of the wavelength, 1/l for a certain metal. If the work function of the metal was 2.08 × 10-19 and velocity of electromagnetic wave is 3.0 × 108 ms-1

30

VSX10- 1(V )

25

20

15

10

5

051015202530

1-17

/(m) X10

- 5

- 10

- 15

Fig. 7

(i) the slope of the graph.V (S )

(ii) the value of the electronic charge.

hcW Ouse the graph to determine

(3 marks)

e e(4 marks)

16.(a) Distinguish between e.mf. and terminal voltage of a battery.(2 marks)

(b) The graph in figure 8 shows the variation of potential difference V against current I for a cell when current is drawn from

it.

2.0

1.5

1.0

0.5

Fig 8

00.20.4

0.60.81.01.2

(i) From the graph determine

(a) The e.m.f of the cell.(2 marks)

(b) The internal resistance of the cell.(4 marks)

(c) on the space provided below, draw a circuit that could be used to obtain the results represented by the graph.

(2 marks)

(d) Figure 9 shows an electric circuit. When the switch is closed the ammeter reading is 0.3A. Neglect internal resistance.

10v

A

101amp

V

Page | 220

232/1,232/2,232/3 physics

Fig 9

Determine the voltmeter reading(2 marks)

17. Figure 10 below shows parallel rays of light incident on a convex lens.

FF

Complete the ray diagrams to show the emergent beam in each case.(2 marks)

(b)Table 2 below shows values of object distance U and corresponding value of image distance V for a convex lens.

Object distance U (cm)101520253035

Image distance V (cm)24.617.113.311.810.910.4

Table 2

(i)Plot a graph of (U + V) against UV.(5 marks)

(ii) Determine the focal length of the lens.(3 marks)

(c) Give one difference between the eye and the camera.(1 mark)

18.(a)(i) State Faraday's law of electromagnetic induction.(1 mark)

(ii) State the difference between induction coils and a step-up transformer.(1 mark)

(b) An ideal transformer steps 8.0V upto 2000V, and the 4000 turns secondary coil carries 2.0 Amps.

Calculate.

(i) The number of turns in the primary coil.(2 marks)

(ii) the current in the primary coil.(2 marks)

(c) Figure 9 below shows a diagram of a bicycle dynamo. Wheel A is connected by an axle to a permanent cylindrical magnet

and is rotated by the bicycle wheel.

Bulb

(i) Explain why the bulb lights.

A

S

N

Soft iron

(2 marks)

(ii) How would the person riding the bicycle make the bulb brighter.(1 mark)

Page | 221

232/1,232/2,232/3 physics

GUCHA SOUTH EVALUATION TEST (GSET) 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/3

PHYSICS PAPER 3

CONFIDENTIAL INSTRUCTIONS

The information in this paper is to enable the head of the school and the teacher in charge of Physics to make adequate preparations for this year's Physics practical examination. NO ONE ELSE should have access to this paper or acquire knowledge of it’s contents. The teacher in charge of physics should NOT perform any of the experiments in the same room as the candidates or make the results of the experiment available to the candidates or give any other information related to the experiments to the candidates. Doing so will constitute an examination irregularity which is PUNISHABLE.

Each candidate should be provided with the following:

Question 1

Saturated salt solution in 500ml beaker. Two identical cylindrical 100g masses Three pieces of thread.

A retort stand.

A metre rule

Question 2

Ammeter

A voltmeter

A wire labelled X on a mm scale (Gauge 32) A switch

A jockey

Three new size D dry cells.

Six connecting wires with crocodile clips at both ends. Three cells holders.

GUCHA SOUTH EVALUATION TEST (GSET) 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/3

PHYSICS

PAPER 3 (PRACTICAL) Question 1

You are provided with the following. - Two pieces of thread.

- Saturated salt solution in 500ml beaker. - Two identical cylinder masses of 100g - A retort stand.

- A metre rule.

a) Determine the volume V of one of the masses using the apparatus provided. Record V

V = _________________(2 marks)

Explain how you determined the volume V.(1 mark)

b) i) Determine the centre of Gravity of the metre rule and record it.

G ...(1 mark)

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232/1,232/2,232/3 physics

ii) Arrange the apparatus as shown in the diagram below such that X = 5cm from the pivot with a 100g mass completely immersed in the solution, hang the other 100g mass from the metre rule and adjust its position until the system is in equilibrium a shown in the diagram.

XYMetre

GString

String

String

100gSaturated (L)100g

Salt solution

iii) Repeat the procedure above with the following values of X and fill the table.

x (cm)51015202530

y(cm)

NB: During each experiment ensure that the position of the pivot does not change.

(c) Plot a graph y (y - axis) against x.(3 marks)

(d) Determine the slope "s" of the graph.(2 marks)

(e)Given thatS FWhere F is the apparent weight of the mass is the liquid L and W is the actual mass, calculate the value

W

of F and the upthrust U.(3 marks)

(f) Hence determine the density e of the liquid L.(3 marks)

Question two.

A wire mounted on a milliameter scale and labelled X. A switch.

Ammeter

3 cell holders.

3 new size D dry cells.

Seven connecting wires, three with crocodile clips both ends. Jockey.

Proceed as follows.

(a) Connect the circuit as shown in the figure below.

Q

Wire X

A

V

S

(b) Adjust the contact Q so that the reading on the voltmeter is 1.3V, note the reading of the current and record it in table below.

(c) Repeat the procedure above for the values of voltage given in the table and record the corresponding values of the current.

(d) Plot a graph of voltage V (y-axis) against current I(A)(5 marks)

(e) Determine the gradient of the graph.(3 marks)

(f) State the equation relating the voltage V, the internal resistance r and the e.m.f of the cell.(2 marks)

(g) From the graph determine the values of

(i) The e.m.f E of the cell.(1 mark)

(ii) The internal resistance, r of the cell.(2 marks)

Page | 223

232/1,232/2,232/3 physics

GUCHA SOUTH EVALUATION TEST (GSET) 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS PAPER 1

MARKING SCHEME

1. Actual radius

= (main scale reading + thimble scale) - zero error

=

6 0

20

100

0 02 mm

6002002

620002

618mm

2. h1p1g = h2p2g ü1

h × 900 = 0.06 × 1200 ü1

3.

Latent heat of fusion

Is the heat required to convert a

substance from solid to liquid state

without change in temperature.

4. Tension

= F = mrw²

= 8 × 0.8 × (2 × 3.14 × 2.5)²

= 15747.536 N

5.

Specific latent heat of fusion

Is the heat required to convert unit mass /kg of a substance from solid state to liquid state without change in temperature.

6. In liquids the forces are smaller and molecules are able to roll. over one another while in the gaseous sate, the molecules are free to more because gases have the weakest force of attraction.

7. (a) In a vacuum.

(b)

Displacement

(m)

Time (s)

8. F = ke

10 = 0.04k k = 10

0.04

= 250N/m 50 = 250e e = 50

250

=0.2m

Total e =

0 2

3

0 2

0 2

2

=0.3666m

=36.66cm

9.Silvered glass walls reflect heat away.

Page | 224

232/1,232/2,232/3 physics

10. A1V1 = A2V2 ü1

× 2² × 3 =

V2 =

× 6² × V2

2 2 3

6 2

033m /s

11. A - Positive terminal.

B - negative terminal

12. C - Powdered carbon and manganese (IV) oxide. D - Ammonium chloride paste.

13. Liquid A expands and becomes less dense thus reducing the upthrust force in beaker A. Therefore higher uptrhust force in beaker B. Cause the beam tip towards beaker A.

14.a) Vertical projection

U = 100m/s, g = 10m/s², V=o/s V² = U² - 2gs

O² = 100² - 2 × 10 × 5 20s = 10,000

s = 500m

b) Horizontal projection h = ½ g t²

500 = ½ × 10 x t² t² = √1

= -10s or 10s

= 10s

(c) Range = R = ut R = 20 × 10

= 200m

(d) Impulse = change in momentum Ft = (10N × 3S) = 30Ns

= 20N × 2s = 40NS P = 30Ns - 40Ns = -10Ns

(e)(i) V O

t

, t (5 ticks 0 01 ) s

= 0.05S

V

0 05

2

5 cm / s

v0055025cm/s

(ii) V - u = 0.25cm/s

0125cm

U

12

0 01 s

Jcm / s

V - U = DP

V - 12.5 = 0.25 V = 12.5 + 0.25 = 12.75cm/s

15.a) (i) M.A

(ii)

V

L

E

450 150

R

N

3

N

No of teeth on driven gear

No of teeth on driving gear

80

4

Page | 225

232/1,232/2,232/3 physics

(iii)

n

3

4

M A

VR

100

100 %

%

75%

(b)(i) Converts electrical energy to sound energy.

(ii) Chemical kinetic potential

c) Mass of ice = pv

= 0.9g/cm³ × 2000cm² = 1800g = 1.8kg

Mass of can + ice

= 1.8kg + 0.2 = 2.0kg

Work (w) = f × d = 20N × 5m = 100j

Power = Work done

time

= 100s = 25J/s or 25 watts 4s

16. a) I.

i)123 - (70 + 50)

123 - 120 = 3g

ii) Heat gained by water and calorimeter = mcDq

= 0.07 × 4200 × 25 = 7350J

Heat gained by calorimeter

50

390 25

100

Total heat gained

487 5 J

= 487.5 + 7350 = 7837.5J

II. (i) Heat lost by steam

= ML + MCDE

(ii)= 0.003L + (0.003 × 4200 × 70) = 7837.5S

0.003L = 6955.5

III. Quantity of heat required to melt 1g of ice completely toe water, 334 j of heat is required.

IV. Pure water it has a higher specific heat capacity therefore it takes a lot of heat energy before changing its temperature.

17.(a) A floating body displaces its own weight of fluid.

(b) (i) Volume of B displaced

= 1/3 × 0.012 = 0.004m³

Mass of B displaced

= V = 0.004 × 800 = 3.2 kg Weight of B = 3.2 × 10 = 32 N (ii) Weight of liquid A displaced.

= 50 - 32 = 18 N

(iii) Volume of A = 2/3 × 0.012 = 0.008m³

Mass of A =

Densities of A

=Mass of

Volume of

1 8 kg

1

A

A

0 008 m ³

3

225 kgm

Page | 226

232/1,232/2,232/3 physics

c) T = u - mg

31

0012800001222550

=44

2875N

(d)(i) To make it float upright.

(ii) To increase sensitivity

18. (a) 2nd The rate of change of momentum of a body is directly proportional to the applied force and takes place in the

direction in which the force acts.

(b)(i)

s

U

d

2

100 20

2

5 m / s

(should be shown on the graph) ii) S = 20k

iii) When the bench is more rough U reduces hence K reduces when the bench is smooth U, increase hence K increases.

(c) V² = u² + 2as

u + 2 × 1.2 × 400 = 960 V = 30.98 m/s

Momentum = mv = 800 × 30.98

= 24787.09 kgms-1

R mg

mv r

2

mv r

2

mg

2004²

10

10001000

21332N

4133N

Page | 227

232/1,232/2,232/3 physics

GUCHA SOUTH EVALUATION TEST (GSET) 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/2

PHYSICS PAPER 2

MARKING SCHEME

1.M

Eye

I

Rays with arrows in right direction Object position

2. Increase the number of turns. Increase the current in the coil

3. A - Brown / Red

B - yellow / Green

Fuse - Protect the appliance from excess current.

4. Image on a plane mirror is virtual while ü1 pinhole forms real / erect in mirror end upside down / on mirror same size as object while in pinhole the image size varies AORA.

5. Combined parallel capacitance

C1100F100F

200F1111

Total capacitance

C T

200

200400

From

6.P I

1

C T

C T

2

R

752

5

400 80 F

75

75

R

240R

240

2

75

2

768

7. Periodic time = 60 secs.

8. More electrons are released through thermionic ü1 emission hence brightness increases.

9. In the forward bias majority carriers are electrons. Also barrier p.d. is decreased.

10. Minimises echoes.

11. i) Current is produced due to changing flux linking the coil through inductions.

ii) The induced current is such as it produces a magnetic effect opposing the incoming pole.

12.

eye

45°45°

Image position

Correct rays

13. Yellow, radiowaves, microwaves, Gamma rays.correct order

Page | 228

232/1,232/2,232/3 physics

14. (a) (i) Brown lead should be connected where the blue ü1 is, yellow to be connected where the brown is ü1 and the blue lead to be connected where the green / yellow is connected. (Any two)

(ii) No current will flow.

(iii) The earth pin opens the holes (blinders) for the live and neutral pins. Also to ensure it reaches the metallic part of the appliance.

(b) i)

60 5 3 1

2

1000

1 05 Kwh

(ii)= 1.05kwh × 7×6.7=49.245

15.a)i) Threshold frequency is the minimum frequency below which p.e.e. will not occur. The threshold wavelength is the

maximum wavelength above which p.e.e. will not to be place.

(ii)

(I) C = f

3.0 × 108 = 8.0 × 10-7 × fo

3 0 10 8

14

fO 7 3

75 10

Hz

8010

II.12

Ehfo2mv

1

2

mv

2

hf hfo

341414

6 62 10 8 5 10

31 445 10 20 J

12 5 0 10 1

3

75

10

8

b)(i)Slope712510Vm

201010

hc8

(ii)Slope12510

e

e

6 62

34

10

1 25

18

8

3 0 10

8

10

16.

(a)

(b)

15 89 10

1 589 10 19 C

E.m.f is the p.d. across the battery in the ü1 open circuit while terminal voltage is the p.d. across the cell is a closed circuit.

(i) E.m.f = 1.625V ü1 (show unit)

(ii)E = IR + Ir

V = E - Ir

V = Ir + E

1 5 1 00 5

Slope = r

r 0

(c)

S

0 16 0 8

78

V

0 78

0 64

A

Ammeter in series with cell Position of voltmeter

d)V = IR = 0.3 × 10 = 3V

P.d. across lamp = 10 - 3 = 7V

Page | 229

232/1,232/2,232/3 physics

17. (a)

FF

Point of convergence of rays.

Correct rays, middle ray straight.

b)(i)

U + V (cm)34.632.133.336.840.945.4

UV cm²246256.5266295327364

(ii) Gradient =

( u v )

uv

45 4 36 8

f

364 295

8 6

0 1246

69

1 8 02 cm

01246

(c) Focal length of the eye is variable while that of a camera is fixed.

18. (a)(i) The magnitude of the induced e.m.f is directly proportional to the rate of change of magnetic flux linkage.

(ii) Induction coil use D.C. in the primary circuit while transformer uses A.C in its primary coil.

(b) (i) N

N

N

S

P

P

V

S

V P

8

2000

4000

16turns

(ii)IN

I

P

S

S

N

P

4000

I P

16

2 0

500A

(c)(i) As the magnet rotates there is charge in magnetic flux linking the coil. This induces current in the coil hence the bulb

lights.

(ii) Increasing the speed of rotation of the wheels / speeding up.

Page | 230

232/1,232/2,232/3 physics

GUCHA SOUTH EVALUATION TEST (GSET) 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/2

PHYSICS

PAPER 3 (PRACTICAL) MARKING SCHEME

1.(a) V

r 2 h

2 522

2 5 2 3 142

12 27 cm ³

A = 1 mark (well labelled) S = 1 mark for correct scale

b)(i) f1 = 50.0cmP = 2mks for all pts

(ii)

X(cm)51015202530

Y (cm)4.08.012.216.520.825.0±0.5

(c)

S

F

S = 1 mark

P = 2 marks for all pts

A = 1mark if well labelled

L = 1mark for all points correct plotted and line drawn

W

(d) y

Slope S

x

0 8333

2.

P.d. V (volts)1.3

W

16 5 4F S W

20 5 0 8333

0 8333 N

u 1 0 0

0 1667

1.21.110.9

100

1000

8333 N

0.8

e

f

1

10

0 8333

1 2 g / cm ³

0.7

Current I (A)0.120.180.2830.360.420.42±0.1

1 mark for each value

A = 1 mark (well labelled) S = 1 mark for correct scale P = 2mks for all pts

= 1mark - for 4 pts correctly plotted. L = 1mark

Page | 231

232/1,232/2,232/3 physics

Gradient =0 7 1 1

0 6 0 28

E IR Ir

E V Ir

0 4

1 25 g

0 32

) i ) E y intercept

1 5 V( Accept ( 1 4

ii ) Internal resitance r

r 1 25

1 6) V(Total 1mark)

Slope

V E IrBut IR = V

V Ir E

V Ir E

(Total 2marks )

Page | 232

232/1,232/2,232/3 physics

WESTLANDS JOINT EXAMINATION 2016

Kenya Certificate of Secondary Education (K.C.S.E)

232/1

PHYSICS

PAPER 1 (THEORY)

1. Atomic physics is a branch of physics. State what it deals with.(1 mark)

2. A parker pen was accidentally dropped into a measuring cylinder containing water. The volume of water moved from initial level to form the final level as shown below.

5

4Final level

3

2Initial level

1

If the mass of the parker pen is 0.012kg, determine its density.

3.(i) Define a vector quantity.(1 mark)

(ii) Which of the following quantities are vectors: mass, weight, power, time, density and velocity.(2 marks)

4.Pressure of a laboratory water tap in a school in Nakuru is 40,000 N/m². Calculate the height of the tank from which the water

is supplied.( density of water = 1g/cm³, g=10N/kg)(2 marks)

5.Explain the cause of random motion of smoke particles as observed in Brownian motion experiment using a smoke cell.

(1 mark)

6. When a particular substance at a certain temperature is heated, It expands. When the same substance at the same temperature

is cooled. It also expands

(a) What is the substance.(1 mark)

(b) What is the temperature.(1 mark)

6. When a particular substance at a certain temperature is heated, it expands when the same substance at the same temperature is

cooled. It also expands

(a) What is the substance.(1 mark)

(b) What is the temperature.(1 mark)

7. (a) Draw a vernier calliper to show a reading of 7.36cm(1 mark)

(b) What is the micrometer screw gauge reading in the figure shown below.(1 mark)

111213140

m m

45

8. State and explain why it would be advisable to use hollow bricks in place of normal building stones in countries which

experience winter.(2 marks)

9. The three springs shown below are identical and of negligible weight. The extension on the system of springs is 20cm.

20 N

20 N

Determine the constant of each spring.(2 marks)

10. A Planck of negligible weight is kept in a horizontal position by the forces shown in the diagram below.

Y8N2m

Q6N

(i) Calculate the magnitude of force Q.(1 mark)

(ii) Calculate the value of Y.(2 marks)

11. Air is blown over a piece of paper as shown below. State what is observed.

Piece of paper held horizontal here

Piece

Air blownof paper

horizontally

Page | 233

232/1,232/2,232/3 physics

12. The figure represents the velocity-time graph for a lift in a department store. Use the graph to calculate

Velocity

(m /s )5

123456789

Tim e (s )

(i) The acceleration of the lift.(1 mark)

(ii) The total distance travelled by the lift.(1 mark)

13. A bicycle tyre is found to have a pressure of 8 × 104 N/m² at 20°C. Assuming that the volume of the air inside remains constant, calculate the pressure if the temperature of the tyres rises to 29°C when the tyre is left in the sun for sometime,

given that the atmospheric pressure is 105N/m²(2 marks)

14. (a)An object which is moving over a horizontal surface slows down until the motion finally gets to zero. Explain what is

responsible for this observation.(1 mark)

(b) A trolley of mass 5.00 kg rests at a plain horizontal shown below.

(i) Show on the sketch, the forces acting on it when pulled in one direction.(4 marks)

(ii) When the trolley is pulled with a horizontal force of 24N, the trolley accelerates at 3m/s². Find the frictional force

acting on the trolley.(2 marks)

(c) An automobile of mass 500 kilograms is accelerated from rest along a horizontal surface. The force produced by the engine

is 300N and that due to friction is 50N. What is the accelerated force and what is the acceleration produced?(2 marks)

15. (a) State the energy changes that occur when

(i) A man climbs a mountain.(1 mark)

(ii) A woman addresses a crowd using a microphone.(1 mark)

(b) A machine with a wheel of diameter 1.6m and axle of diameter 0.4m lifts a load of mass 12kg with an effort of 120N.

Given that the acceleration due to gravity is 10m/s².

Calculate

(i) The velocity ratio of the machine.(2 marks)

(ii) The mechanical ad