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TILAK HIGH SCHOOL

ANNUAL EXAMINATION

PHYSICS

FORM 5

Time allowed: Three hours. (An extra 10 minutes allowed for reading this paper)

INSTRUCTIONS

1. Write all your answers in the answer book provided.

2. Write your name on the front page of the answer book.

3. You may use calculator provided it is silent and battery operated.

4. There are toe sections in this paper. Both are compulsory.

SECTION GUIDELINES TOTAL

MARKS

SUGGESTED

TIME

A

There are thirty multiple

choice questions.

All are compulsory.

30 54 minutes

BThere are seven questions.

All are compulsory.70 126 minutes

1

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1. The product of two measurements 7.8cm and 2.39cm is best expressed as

2

SECTION A MULTIPLE CHOICE [30 MARKS]

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A. 10cm2 B. 18.6cm2 C. 18.642 cm2 D. 19 cm2

1. The number of significant figures in the number 120.02 is

A. 3 B. 4 C. 4 D. 5

1. Which of these is not a derived quantity?

A. Time B. Energy C. Power D. Force1. A body falls freely under gravity when released from rest. Which of the following graphs

represents the acceleration acting on the mass during the time of its fall?

A. B. C. D.

1. Which statement correctly describes a vector quantity?

A. a 3kg mass moved a distance of 5m.B. a 3kg mass travelling at a speed of 6m/s.

C. a distance travelled 5m due south.

D. a distance of 5m travelled in 4s.

1. A spring is compressed 10cm by a force of 4N. The spring constant of the spring is

A. 0.4 N/m B. 4 N/m C. 40 N/m D. 400 N/m

1. A force of 8 N is applied to a 4 kg mass at an angle of 60 0 to the horizontal as shown

below.

If the mass moves 6m in 7 seconds, what is the work done on the mass?

A. 8 J B. 16 J C. 24 J D. 48 J

Refer to the following information to answer questions 8 and 9.

The diagram given below shows a 1 kg mass travelling East at 3 m/s. It changes direction

and is observed an instant later to be travelling south at 4 m/s.

1. The vector that best represents the change in velocity of the mass is

A. B. C. D.

3

a a a a

t t t t

6004 kg

8 N

3 m/s

4 m/s

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1. The magnitude of the change in velocity of the mass is

A. 1 kgm/s B. 5 kgm/s C. 7 kgm/s D. 12 kgm/s1. A train accelerating from rest travels 30m in 6 seconds. Its acceleration is approximately

A. 0.6 m/s2B. 1.2 m/s2 C. 1.7 m/s2 D. 5 m/s2

1. The image in a pinhole camera is always

A. Virtual and inverted B. Virtual and upright

C. Real and inverted D. Real and upright

1. In an experiment on power, Form 5 physics student measured the time it takes for

Williams to run up a 12 m high slope. It was found that Williams whose mass is 120 kg

took a time of 3 seconds to run up the slope.

The average power generated in running up the slope isA. 1200 J B. 1440 J C. 2400 J D. 4800 J

1. For the arrangement shown below, what force is applied at P to keep the beam at

equilibrium?

A. 9 N B. 12 N C. 18 N D. 36 N1. According to the principle of floatation, a floating body displaces

A. its own weight of fluid B. its own volume of fluid

C. less than its weight of fluid D. more than its volume of fluid

15.The temperature of an ideal gas increased from 270C to 1270C at constant pressure. If the

volume was originally 30ml, the new volume will be obtained by

A. 30 400300 B. 30 300400

C. 30 27127 D. 30 12727

15.The relationship between the pressure and volume of a fixed mass of gas at constant

temperature is best represented graphically by

A. B. C. D.

15.A beam of white light is incident on a glass prism is spread into spectrum of colours. This

phenomenon is called

A. reflection B. dispersion C. diffraction D. refraction

18. A convex mirror will always produce image which is

4

2 m

0.5 m

P9 N

P P P P

V V V V

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A. virtual B. real C. inverted D. enlarged

19. Refraction of light in eye occurs at

A. the lens B. the cornea C. the iris D. the lens and cornea

20. A light ray is incident on a mirror as shown below.

Which of the following angles p, q, r or s represent the angle of reflection?

A. p B. q C. r D. s

21. A wave in which the particle vibration is perpendicular to the direction of motion is a

A. transverse wave B. stationary wave

C. longitudinal wave D. travelling wave

22. The diagram given below shows a wave moving towards left.

P

In which direction is point P moving at the instant shown?

A. B. C. D.

23. The diagram given below shows the electrical symbol of an item commonly used in

electrical circuits.

The above item is drawn to represent

A. bulb B. switch C. resistor D. capacitor

24. A boy standing 600 m from a wall fires a gun. He is able to hear the echo for the sound of

gunshot after 4 seconds. What is the speed of sound in air?

A. 150 m/s B. 200 m/s C. 300 m/s D. 600 m/s

25. The energy conservation that takes place in a motor is

5

p

q r

s

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A. electrical to mechanical energy

B. mechanical to electrical energy

C. kinetic to potential energy

D. heat to sound energy

26. Which of the following does not contribute to increase the out-put of a motor?

A. use stronger magnets B. use more turns of coil

C. increase the current D. decrease the current

27. Three resistors of 3 ohms each are connected in series. The combined resistance of the

three resistors would be equal to

A. 1 ohm B. 3 ohms C. 6 ohms D. 9 ohms

Refer to the information given below to answer questions 28, 29 and 30

A bar magnet is moved away from a coil of wire as shown below.

P Q

X Y

28. Which of the following correctly describes the polarity induced at P and Q?

P Q

A North No Polarity

B North South

C South North

D No Polarity South

29. The direction of the induced current in the coil is from

A. P to Q B. Q to P C. X to Y D. P to X

30. The person whose law is used to determine the direction of current is

A. Boyle B. Lenz C. Fleming D. Charles

QUESTION 1

A)In your answer book draw the field lines around the charges given below.i) ii)

6

N

SECTION B 70 MARKS

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[2 marks]

D) The diagram give below shows A ball is kicked from the edge of a cliff as shown below

P

In the diagram in your answer book (for the position of ball at P) draw and label its

i) Acceleration

ii) Horizontal velocity

iii) Vertical velocity

[2 marks]

A)

8

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QUESTION 2

A) What is the number of significant figures for the following

i. 23.01

ii. 560.210 [2 marks]

A) The velocity time graph given below shows the motion of a car along a straight line.

i. What is the velocity of the car at time t = 1s?

ii. Calculate the acceleration of the car for first 2 seconds.

iii. Briefly describe the motion of the car from time t = 5s to t = 7s.iv. What is the displacement of the car for first 5 seconds?

v. What is the cars average speed for first 5 seconds? [5 marks]

A) A 2 kg object is suspended from a spring balance which is calibrated in Newtons.

i. What will be the reading on the spring balance?

The object is than completely submerged in a water (density = 1 g/cm3). The reading on

the spring balance reads 10 N.

ii. What is the weight loss of the object?

iii. What volume of water gets displaced due to the object being submerged in it?[3 marks]

QUESTION 3

A) In an experiment on Hooks Law, masses were attached to a light helical spring. The

table below shows the force applied by the masses and the corresponding extension of

the spring.

Force (N) 0 2 4 6

Extension (m) 0 0.1 0.2 0.3

i. I n your answer book, plot ht e graph of force verses extension correctly labelling

the axis and title.

ii. What was the maximum mass attached to the spring?

iii. Calculate the spring constant of the spring.

iv. How much energy is stored in the spring when it is extended by 0.2m?

[5

marks]

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A) Two forces are applied on a 3 kg mass as shown below.

12 N 15 N

i. What is the resultant force acting on the mass?

ii. Calculate the acceleration of the mass.

iii. If the mass is initially at rest, what will be its velocity after 4 seconds?

[3

marks]

A) Two masses are placed on the pistons as shown below

P1 P2

The area of P1 is 4 m2 and for P2 is 1 m2.

i. What is the pressure exerted by the 10 kg mass on piston P1?

ii. Calculate the mass M2 on piston P2 so that the pistons remain stationary.

[2

marks]

QUESTION 4

A) The diagram given below shows a parcel mass of 10 kg being droppedfrom a plane with

a speed of 120 m/s.

10

3 kg

10kM2

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A) A meter ruler of negligible mass is pivoted at the 40 cm mark. A mass weighing 10 N is

suspended from the 80 cm mark as shown below

F

What weight force F must be applied to the 10 cm mark so that the meter ruler is

balanced? [2

marks]

B) A trolley of mass 2 kg moving at 6 m/s collides with a stationary trolley of mass 1 kg as

shown. After collision both the trolleys stick together and move with a common speed Vm/s.

2 kg 1 kg

6 m/s Vm/s

Before collision After collision

i. State the law of conservation of momentum.

ii. What is the momentum of the 2 kg trolley before collision?

iii. Calculate the total momentum before collision.

iv. What is the total momentum after collision?

v. Find the combined speed Vm/s with which both the trolleys move.

[5

marks]

A) A radio controlled toy car starts and accelerates with uniform acceleration of 0.5 m/s 2 in a

straight line. What speed does it reach after accelerating for 4 seconds?

[3 marks]

QUESTION 6

A) The diagram given below shows a simple barometer.

A

76cm

12

0.4m 0.8m

10

0.1m

30cm

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i. What does region A represent?

ii. What keeps mercury in the tube?

iii. What is the atmospheric pressure being shown by the barometer?

[3

marks]

A) A transformer with 1000 turns in primary coil has an input voltage of 240 V. The

secondary coil has 100 turns.

i. State whether it is a step-up or step-down transformer.

ii. Explain why the soft iron core in transformers mostly laminated?

iii. What is the out-put voltage at secondary coil?

[3

marks]

A) 200 grams of water is heated from 30oC to boiling point.

[specific heat capacity of water is 4200J/kg oC]

i. What is the change in temperature?ii. Is the heat energy added or removed from water?

iii. What is the heat energy required to raise the temperature of water to boiling

point?

iv. If a 1000W heater is used to heat the water, how long will it take for water to

boil?

[4

marks]

QUESTION 7 20 V

A) In the series circuit shown, find

i. The total resistance

ii. The total current

iii. The voltage across each resistor.

[3 marks]

A) Diagram given below shows a parallel circuit.

12 V

i. What is the total resistance?

ii. What is the total current in the circuit?iii. What current flows through each resistor?

13

50 150

3

6

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iv. Calculate the power out at 3 resistor. [4

marks]

A) Shown below is simple AC generator.

i. Name the parts labelled x and y.

ii. What energy conversion does tales place in a generator?

iii. State one way in which the induced current in the coil can be increased.

[3

marks]

THE END

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