A.E.A The Professional coaching Academy for I.C.S.E IX & X ... · PDF filePhysics Paper 1 Section I (40 Marks) (Answer all the Questions) ... State Pascal’s law. ... Question 4 1

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A.E.A The Professional coaching Academy for I.C.S.E "IX & X" STD in Physics,Chemistry & Maths.

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Physics Paper 1Section I (40 Marks)(Answer all the Questions)

Question 11. A base ball is thrown vertically upwards. When will it have maximum and minimum velocity? [2]2. When is a body said to have acceleration? [2]3. What do the following v-t graphs represent? [2]

4. A stone thrown up at 10 ms-1 reaches a maximum height of 40m. Find its maximum velocity,minimum velocity, time of ascent and time of descent (Take g = 10 ms-2) . [4]

Question 21. While measuring the diameter of a bob of a simple pendulum, the main scale of the vernier

callipers reads 2.45cm and 4th division on the vernier scale coincides with the main scale.There are 10 divisions on 1 cm on the main scale and 10 vernier divisions are equal to 9divisions on the main scale. Find the least count and the diameter of the bob in centimetreand metre. [4]

2. Find the order of magnitude of the following:- [2]a) 256.725 x 10-6 m b) 82578.002 x 106 kg.

3. Write in the correct form for the following units. [2]a) Joule b) mts/sec c) joule/kg/k d) N-s-m-2

4. When the headscale of a screw gauge is rotated 5 times 10mm are exposed. The headscale contains 50 divisions. Find the pitch and least count of the screw gauge. [2]

Question 31. Mention any two basic forces in nature. [2]2. Distinguish between scalar and vector quantity. Give two examples for each. [4]3. Find the acceleration produced in a body of mass 3kg when a force of 18N acts on it.[2]4. Define momentum? How is it measured? What is its direction? Write its S.I. Unit? [2]

(a) (b)

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Question 41. What is fluid thrust? Give its S.I. unit. [2]2. Name any two factors on which the pressure at any point inside a liquid depend [2]3. State Pascal’s law. Give any two application of it. [2]4. Express the relationship between the weight W of the body which acts in the downward

direction and the buoyant force or the upward thrust W which acts in the upward direction.[3]

5. Mention the S.I unit of pressure [1]

Section B (40 Marks)(Answer Any Four Questions)

Question 51. On a humid day, the sound of a siren is heard quicker. Why? [2]2. While doing an experiment to determine the acceleration due to gravity of a particular place

using simple pendulum, what is its time period if its length is 60 cm? (Take g = 9.8 ms-2)[2]3. What is SONAR? Mention any one of its use. [2]4. Derive the relationship between the velocity, frequency and wavelength of a sound wave.[2]5. Give any two difference between longitudinal and transverse waves. [2]

Question 61. An object is at a distance of 30 cm from a concave mirror of focal length 8 cm. What is

its radius curvature? Find the position of the image by drawing. [3]2. How many images are formed when two plane mirrors are parallel? [1]3. What is the minimum height required for a plane mirror to show a person’s full image? [1]4. Give any two applications of concave mirrors. [2]5. Complete the following diagrams: [3]

(a) (b) (c)

O

FO F

F

a) b)c)

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B A F

E

C

D

Question 71. Which instrument is used for measuring the following:- [4]

a) The growth of the stem of a plant.b) The diameter of the inner gap in a compact disc.c) The time taken for 20 oscillations in a simple pendulum.d) To find the unknown level of water in a beaker.

2. What is the principle of a periscope? Where is it used? [2]3. Distinguish between uniform velocity and average velocity. [2]4. a) What is the distance travelled by light in one month? (1 month = 30days) b) What is the distance travelled by sound in one hour at 0oC? [2]

Question 81. At sea level, the atmospheric pressure is 1.04 x 105 pa. Assuming g = 10ms-2 and density

of air to be uniform equal to 1.3kg m-3, find the height of the atmosphere. [2]2. Give two reasons why water is not a barometric liquid. [2]3. A block of wood is floating on water with its dimensions 25cm x 25cm x 25cm inside water.

Calculate the buoyant force acting on the block . Take g = 9.8 ms-2 [2]4. A block of wood floats in water with 1/5th of its volume above the surface. Calculate the

density of wood. [ Take density of water as 1gcm-3 ] [2]5. a) What is centre of buoyancy? b) State the principle of floatation. [2]

Question 91. The coefficient of cubical expansions of copper is 5.1 x 10-5 per oC. Calculate its coefficient

of linear expansion. [2]2. What is anomalous expansion of water? State any one of its consequence. [2]3. Calculate the normal temperature of the human body (98.4oF) on the celsius and kelvin scale.[3]4. a) Why is a ventilator provided in a room? [3]

b) Why a room heater is installed near the floor of the room?

Question 101. What causes electrification of two bodies when a) they are rubbed together? b) what is an

ion ? [2]2. What is the purpose of an electroscope? Name any two

electroscopes. [3]3. In the electric circuit shown below, label different parts

A,B,C,D,E,F. [3]4. Mention any two factors on which the electrical

resistance of a wire depend. [2]

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Question11. An aeroplane flies towards north and covers 300 km in 20 minutes. Calculate its velocity in

a)kmph b)ms-1 [2]2. Define the term uniform acclereation. [1]3. Draw the position - time graph of a body undergoing uniform velocity. [1]4. A man rows his boat at a uniform acceleration at the rate of 10 ms-1 in 10 seconds . He then

stops rowing and the boat comes to rest in the next 10 seconds. [3]a) Draw the velocity-time graph.b) Distance covered with uniform acceleration.c) Calculate the average retardation.

5. A stone is vertically thrown upwards. It takes 5 s to return to the thrower. Calculate themaximum height attained by the stone (Take g = 10ms-2). [2]

6. Convert 20 ms-1 into kmph. [1]

Question 21. Give any two examples of inertia of rest. [2]2. Calculate the linear momentum of electron of mass 9 x 10-31 kg moving with the velocity of

5 x 107 ms-1. [2]3. A force of 15 N acts on a glass ball of mass 500 g for 10s. Assuming the ball to be initially

at rest, find its a) final velocity b) distance covered. [2]4. A bullet fired with a force of 4200 N hits a wooden plank and stops. If the bullet is having

a mass of 25g and velocity of 400 ms-1 . What is the distance travelled by the bullet in thewooden plank? [2]

5. State Newton’s law of gravitation. Mention the unit of universal gravitational constant.[2]

Question 31. How do car radiators work? [2]2. What are three main kinds of wind that blow over the globe? [3]3. Give any two applications of heat radiations. [2]4. Explain the following :

a) Why are cloudy nights warmer than the calm and clear nights?b) Dirty snow melts faster than the clean snow. Why?c) Why do people prefer to wear white clothes to dark clothes in summer? [3]

Question 41. Distinguish between real image and virtual images for a mirror [2]2. Define the following terms in relation to a concave mirror. [2]

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a) Pole b) aperture c) focal length d) radius of curvature.3. From the diagram below, show the formation of image by taking two rays from point X.

State four characteristics of the image. [3]

4. Explain how a concave mirror is used as a shaving glass [2]5. Where should the object be placed before a concave mirror to get the same size of image

as that of the object. [1]


Question 51. What is the most convenient unit of mass you will use to measure? [2]

a) mass of a cricket ball b) a medicine capsule.2. What are the order of magnitudes of the following quantities? [2]

a) 1.7 x 10-30 kg b) 2285725 m c) 9.1 x 10-27 kg d) 0.0004587 s3. The least count of a vernier calliper is 0.01cm and it has an error of +5.While measuring

the length of the cylinder, the reading on the main scale is 8.40cm and the 7th divisioncoincides with the main scale. What is the length of the cylinder. [2]

4. The thimble of a screw gauge has 100 divisions for one rotation. The spindle advances 1 mmwhen screw is turned through two rotations. [2]a) What is the pitch of the screw? b) What is the least count of the screw gauge?

5. a) What is a seconds pendulum? b) What are the two factors on which the time period ofa simple pendulum depends? [2]

Question 61. An electromagnetic radiation has a wavelength of 800 . If the velocity of the radiation is

3 x 108 ms-1, what is its a) Frequency b) time period. [2]2. The wavelength and frequency of a sound wave in a certain medium is 100cm and 2000 Hz

respectively. If the wavelength is changed to 125 cm, in the same medium, calculatea)Velocity of sound b) new frequency. [2]

3. A ripple tank produces waves at the rate of 100/min. The distance between one crest and the next crest in 4.5 cm. Calculate (i) time period (ii) wave velocity. [2]

4. How do bats manage to avoid obstacles in its way while flying? [2]5. Mention any two characteristics of a medium. [2]

C Y

x

P

M

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Question 71. Define the following: [2]

a) electric conduction b) electrostatic induction.2. A charge of 100 C flows through a conductor for 2 minutes. Find the magnitude of current

flowing through a conductor. [2]3. With a neat labelled diagram of a simple voltaic cell, show the direction of flow of electric

current and flow of electrons. [4]4. Distinguish between geographic meridian and magnetic meridian. [2]

Question 81. Draw a diagram showing two bulbs connected in parallel to a dry cell [1]2. Draw the symbols of the following elements in an electric circuit [2]

a) fixed resistance b) inductor c) cell d) rheostat.3. Mention any two properties of magnetic lines of force. [2]4. Why is the knowledge of declination important for the navigators? [2]5. Explain, why steel is used in preference to soft iron for making permanent magnets.[2]6. Why do lines of magnetic force never cross? [1]

Question 91. Calculate the pressure exerted by 1 m vertical length of alcohol of density 0.80 g cm-3 in

S.I. units (Take g = 10 ms-2). [2]2. Pressure in a water pipe on the ground floor of a building is 100,000 pa. Calculate the

pressure in the water pipe on the first floor at a height of 5m. [Density of water = 1000 kgm-3; g = 10 ms-2] [2]

3. A solid weighs 0.16 kgf in air and 0.130 kgf in water. Find (i) R.D of solid. (ii) Density ofsolid in S.I units. [Density of water = 1000 kg m-3]. [2]

4. State Pascal’s law. [2]5. Why does a ship made of iron float while an iron nail sinks in it? [2]

Question 101. Convert 75oC into a)Kelvin b) Fahrenheit scales. [2]2. State any two disadvantages of thermal expansion of solids. How they are rectified?[2]3. Calculate the initial length of a metal rod at 25oc if increase in length of this rod is 2 cm

when heated to 6000C. [Given α for metal rod = 15 X 10-6 /oC] [3]4. How do fishes survive in frozen lakes? [1]5. Name any two properties of radiant heat. [2]

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Question 11. When is a body said to be a) at rest b) in motion. [2]2. What is acceleration due to gravity? What is its value on the earth? [2]3. Express 100 Kmh-1 in ms-1 . [1]4. A train takes 3 hours to travel from Bangalore to Mysore with a uniform speed of 70

Kmph-1 . What is the distance between the two cities? [2]5. The figure shows the velocity- time graph of a particle in a straight line. [3]

a) How long does the particle accelerate? b) What is its deceleration? c) What is the totaldistance travelled by the particle?

Question 21. Define linear momentum. What is its S.I. Unit? [2]2. What is the cause of motion of a body from rest? What is the SI unit of that physical

quantity? [2]3. A car of mass 500 kg moving at a speed of 60 km per hour is stopped in 10s. Calculate

the force applied by the brakes. [2]4. Distinguish between mass and weight. [2]5. When a shot is fired from a gun, the gun gets recoiled. Explain. [2]

Question 31. In a hydraulic machine, a force of 15 N is applied on the position of area of cross section

200 cm2. What force is applied on its piston of area of cross section 300cm2 ? [2]2. Name two applications of Pascal’s law. [2]3. Name the two factors which affect the atmospheric pressure when we go up. [2]4. Convert 15 mm of Hg into pascal. Take density of mercury = 13.6 x 103 kg m-3 and

g = 9.8 ms-2. [2]5. A cube of side 3cm is placed inside a liquid. The pressure at the centre of one face of cube

is 5 pa. Calculate the thrust exerted by the liquid on this face. [2]

Question 41. Distinguish between an atom & an ion. [2]

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2. The charge of a body is +5 milli coulomb. Find the number of electrons in excess or deficiton the body. [2]

3. Draw a neat labelled diagram of a gold leaf microscope. [2]4. What is a lightning conductor? Which metal is used for making it? [2]5. What is the minimum possible charge? [1]6. What do you mean by the quantum nature of charge? [1]


Question 51. The incident ray and the reflected ray from a plane mirror are mutually perpendicular. Find

the glancing angle of incidence. Show the phenomenon with a ray diagram. [2]2. An object A is at a distance 100 cm in front of a plane mirror M. If the mirror is now moved

30 cm away from A, how does the image shift from its previous position? [2]3. Complete the following by means a ray diagram. [2]

4. State the relationship between the focal length and the radius of curvature for a sphericalmirror. [1]

5. State the types of mirrors used by [3]a) a dentist b) a hair dresser in a salon c) a driver to view the vehicles approaching frombehind.

Question 61. State any two differences between a transverse and a longitudinal waves. [2]2. Obtain the relationship connecting the velocity, frequency and wave length of a wave.[2]3. How do temperature and humidity affect the velocity of sound in air? [2]4. A wave generator produces 50 crests and 50 troughs in 0.5 second. What is the frequency

of the wave? [2]5. What is the audible range of frequency for human ear? [1]6. What is the velocity of ultrasonic sound in air at 0oC? [1]

Question 71. Give any two difference between heat and temperature. [2]

a) b)

F

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2. Why do telephone wires sag in summer and become tight in winter? [1]3. Why does your school clock show different times by a few seconds in winter and summer? [1]4. How much heat should be given to a brass rod if its length should be increased by 0.5%?

( Given α= 0.00002 0C-1) [2]5. The length of mercury thread in a thermometer rises by 10 cm when it is transferred from dry

ice to steam. If the thermometer is to be calibrated in 0C, find the size of one degree. [2]6. Give any two applications of thermal expansion. [2]

Question 81. A body weighs 300gf in air and 200gf when completely immersed in water. Calculate

a) the loss in weight of the body in water b) the upthrust on the body. [2]2. State Archimede’s principle. Describe an experiment to verify Archimede’s principle.[3]3. What is the centre of buoyancy? [1]4. The relative density of silver in 10.8. What is its density in S.I. unit? [2]5. What is a hygrometer? State the principle on which it works. [2]

Question 91. Which of the following are not fundamental units? Kelvin, joule, ampere,newton, mole,

second. [2]2. Complete the following : [2]

a) 1 μg = ...............kg b) 1 fermi = .................m3. The pitch of a screw gauge in 0.5 mm and the head scale is divided into 50 parts.What is

the least count of screw gauge? [2]4. What is the backlash error in a screw gauge? How is it avoided? [2]5. What happens when a simple pendulum is taken to the moon which has no atmosphere and

acceleration due to gravity is one sixth that at earth’s surface? Explain. [2]

Question 101. Find the current when 1μe of charge passes through a cross section of a conductor in 10s. [2]2. What is the relationship between volt, joule and coulomb? [2]3. How is the resistance of a wire affected when a) its length doubled b) radius doubled? [2]4. State any two evidences of the existence of earth’s magnetic field. [2]5. Distinguish between a natural and an artificial magnet. [2]

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Question 11. How can you find a) displacement from the velocity - time graph? [2]

b) Velocity from the displacement - time graph?2. A parcel dropped from a stationary helicopter, at a height of ‘h’ from ground level, reaches

the camp in 15s. Calculate the (i) value of ‘h’. (ii) final velocity when it reaches the ground.(Take g = 9.8 ms-2 ). [3]

3. In the displacement- time graph given below, the motion of two cars A and B along astraight road in the same direction is given. a) Which car has greater velocity? b) Whenand where did B overtake A. [2]

4. What is free fall? [1]5. Distinguish between uniform velocity and average velocity in motion along a straight line.[2]

Question 21. Derive the relation between newton and dyne. [2]2. When you get away from a boat, it tends to leave the dock. Explain. [2]3. A bullet of mass 50 g and moving with a certain velocity hits a wooden block with a force

of 200 N. Find the velocity of the bullet if it penetrates 50 cm. [3]4. Give any two examples of inertia of motion. [2]5. How is the effective length of the simple pendulum calculated? [1]

Question 31. Draw diagrams to illustrate regular and irregular reflection. [2]2. Give any two differences between real image and virtual image. [2]3. With a neat diagram, for a plane mirror, prove that for a given incident ray, when the mirror

is turned through an angle θ, the reflected ray turns through 2θ. [3]4. Calculate the number of images formed in two plane mirrors, when they are held at an

10

20

30

40

10 2 43

B

A

5time (t) hour

Displacement(km)↑

0

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angle a) 60o b) 30o. [2]5. Define lateral inversion of the image due to a plane mirror. [1]

Question 41. Distinguish between base effect and shrill effect of sound on the human ear. [2]2. Give any two uses of ultrasonic vibrations. [2]3. Obtain the relation between frequency and time period. [2]4. Two turning forks X and Y of frequencies 500 Hz and 400 Hz respectively are vibrated

in air. If the wavelength of X is 2 m, what the wavelength produced by Y? [2]5. Compare light waves and sound waves. [2]


Question 51. A solid of density 3200 kgm-3 is found to weigh 0.80 kgf in air. If 5/8 of volume of solid is

completely immersed in the brine solution of density 1200 kgm-3, find the apparent weightof solid in brine. [3]

2. What is relative density of a substance? ]1]3. Mention the three characteristics of a floating body? [3]4. An ice berg floats in sea water of density 1.17 gcm-3, such that 1/6 of its volume is above

sea water. Find the density of ice berg. [2]5. When does the lactometer measure the purity of milk accurately? [1]

Question 61. What is a thermostat? On what principle does it work? [2]2. A metal cube of side 10 cm at 30oC on heating to 600oC increases by 0.2 cm. Calculate the

coefficients of linear, superficial and cubical expansion. [3]3. Distinguish between trade winds and polar winds. [2]4. What is the order of frequency of radiant heat? [1]5. Why do cooking utensils are kept black from below and shining from the sides? [2]

Question 71. Give any two characteristics of a standard unit? [2]2. What is zero error in a vernier calliper ? How do you correct it ? [2]3. The head scale of a screw gauge has 100 divisions. If the distance uncovered on the pitch

scale is 2 mm for four complete rotations. Calculate (i) pitch (ii) least count. [2]4. Calculate the time period of the simple pendulum of length 1.5m, when acceleration due to

gravity is 9.8 ms-2 . [2]5. Give any two precautions while measuring the mass of a body in a physical balance?[2]

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15

10

5

O2 4 6 8 10 12 14

V ms-1

t (s)

B

A

Question 81. What are conductors? Give an example. [2]2. How is a high rise building protected from lightning? [2]3. Define a) 1 Volt b) 1 Coulomb. [2]4. A charge of 1000 C flows through an electric circuit in 5 hours. Calculate the magnitude of

current in the circuit. [2]5. Draw a neat diagram showing (i) closed electric circuit (ii) open electric circuit. [2]

Question 91. Draw the symbols of the following: [2]

(i) Variable resistance (ii) Inductor (iii) Cells in series (iv) fixed resistance.2. Give any two methods of demagetising a magnet. [2]3. Draw the displacement timegraph for a stationary object. [2]4. Define thermal conduction. Mention a good conductor among non-metals. [2]5. Complete the diagram. [2]

Question 101. What is the linear momentum of electron of mass 9.1 x 10-31 kg moving with a velocity of

6 x 107 ms-1 ? [2]2. A bike rider with his bike weighs 200 kg. While driving at 80 kmh-1, he stops the bike over

a distance of 10m. Find the retarding force on the brakes. [2]3. During rainy season, the mud is splashed off to the man standing behind a bike when it

starts moving. In which direction does the mud get splashed? What physical phenomenonis explained in this? [2]

4. Find the acceleration and the total distance covered by the body in the following v-t graph.[2]5. Write IN and IJ in the form of fundamental units. [2]

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C

O

P F C

(a) (b)

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Question 11. Distinguish between rest and motion [2]2. A car travels first 30km with a uniform velocity of 60 kmh-1 and the next 30 km with a

uniform velocity of 40 kmh-1. Calculate (i) the total time of the journey (ii) the averagespeed of the car. [3]

3. If the displacement-time graph is a straight line parallel to the time axis, what does itrepresent about the motion of the body? [1]

4. From the velocity- time graph given below, find the total distance travelled by the body. [3]

5. Draw acceleration-time graph of a body moving with uniform velocity. [1]

Question 21. Give any two examples of inertia of rest. [2]2. a) While catching a cricket ball, a seasoned cricketer withdraws his hands during the

catch. Why? b) Why are vehicles provided with shock absorbers? [2]3. What force is required to produce an acceleration of 5 ms-2 in a body of mass 10 kg?[2]4. Name any two illustrations to express Newton’s third law of motion. [2]5. Calculate the gravitational force of attraction between the two bodies of masses 100 kg

and 200 kg separated by a distance of 10m. Take G = 6.7 X 10-11 Nm2 Kg-2 [2]

Question 31. A screw gauge has a pitch equal to 0.5mm. How many divisions are there on the head

scale if its least count is 0.001 mm? [2]2. What is backlash error in a screw gauge? How is it avoided? [2]3. Complete the following: [2]

a) 1 ml = _________ m3. b) 1 litre = __________cm3.4. a) What is a seconds pendulum ?

40

30

20

10

05 10 15 20 25

D C

BA

E

V(ms-1)

t (s)

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b) It takes 0.2s for a pendulum bob to move from mean position to one end. What is thetime period of the pendulum? [2]

5. Mention any two precausions while using a beam balance. [2]

Question 41. What are the characteristics of the image formed by a plane mirror? [2]2. The incident ray and the reflected ray from a plane mirror are mutually perpendicular to

each other. Show the angle of incidence and angle of reflection. Draw a neat diagram toshow the reflection phenomenon. [3]

3. Complete the diagrams with the help of straight lines. [2]

4. Write any three characteristics of the image for an object kept at a distance of 40 cm froma concave mirror of focal length 15 cm. [3]


Question 51. State any three laws of liquid pressure. [3]2. A circular plate of radius 5m is placed horizontally 1m below the surface of water.The

atmospheric pressure is 1.013 x 105 Nm-2. Calculate the total thrust on the plate. (Densityof water = 103 kgm-3, g = 9.8ms-2) [3]

3. Explain the action of rubber suckers used as hooks in the kitchen and bathroom. [2]4. What are the advantages of using mercury as a barometric liquid. [2]

Question 61. A body weighs 300 gf in air and 280 gf when completely immersed in water. Calculate (i)

the loss in weight of the body in water. (ii) the upthrust on the body. [2]2. It is easier for a man to swim in sea water than in fresh water. Explain. [2]3. The volume of a balloon is 2000m3. It is filled with helium if density 0.18 kgm-3 .What

maximum load can it lift? Density of air 1.29 kgm-3. [3]4. Why is a hygrometer used in an acid battery? [1]5. The relative density of mercury is 13.6. State its density in (i) C.G.S unit (ii) S.I unit.[2]

a) b)

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Question 71. Name any two factors that contribute to the linear expansion of rod. [2]2. A metallic washer of internal diameter 10cm is heated by 500oc. If the coefficient of linear

expansion of a metal is 1.8 x 10-5 oC-1. What will be its final diameter? [2]3. a) What is the density of water in S.I unit? b) At What temperature is it maximum? [2]4. What are the given temperature corresponding to? a) 86oF in celsius scale.b) 100oC in

kelvin scale. [2]5. a) Why in cold countries windows have two glass panes with a thin layer of air between

them? b) How can the radiating power of a surface be increased? [2]

Question 81. A wave pulse on a guitar string moves a distance 0.5 m in 0.0025 s. Calculate [2]

a) the velocity of the pulse b) the wavelength of wave on string if its frequency is 300 Hz.2. Define the term wave velocity. What is its S.I. unit? [2]3. Name the sounds of the frequencies given below: [2]

a) 15 Hz b) 2000 Hz c) 40000 Hz d) 40 MHz.4. Give any two applications of ultrasound. [2]5. The heart of a man beats 72 times a minute. What is its frequency and time period?[2]

Question 91. What is static electricity? Mention any one method of charging. [2]2. What is ‘quantum’ nature of charge? What is the minimum possible charge? [2]3. What causes electrification of two bodies when they are rubbed together? [1]4. A truck transporting fuels like petrol and diesel has a metal chain dangling to the ground.

Explain. [2]5. The charge on a body is -2c. Find the number of electrons in excess or deficit on the body.[2]6. Which material is used for the rod (or stem) in a gold leaf microscope? [1]

Question 101. Distinguish between a primary and a secondary cell. Give an example for each. [4]2. Calculate the current in the motor when it is switched on for 0.5s and 20C of charge passes

through the coil. [2]3. Give any two factors that affect the resistance of a conductor. Explain as to how they

contribute to the increase or decrease of resistance. [4]@@@

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Question 11. Can the displacement be zero if the distance is not zero? Explain your answer with an

example. [2]2. Which of the following has the largest inertia? Explain with reasons. a) a bus b) a motor-

cycle c) an aircraft carrier d)a bicycle. [2]3. Distinguish between speed and velocity. [2]4. Determine the distance travelled by the body from the following velocity- time graph.[4]

Question 21. Light travels at a speed of 3 x 108 ms-1. a) Calculate the distance travelled by light in one year

(365 days) in km. b) What is the distance obtained in the above question known as? [3]2. The ratio between the lengths of two simple pendulums is 25:36. What is the ratio between

their a) time period b) frequency. [2]3. A hockey ball at rest is hit by a hockey stick so that the force acts on the ball for 0.05 s. It

acquired a velocity of 20 ms-1 in 2 second. Calculate the force acting on the ball if its massin 250 g. [3]

4. Identify the laws of motion that can describe the following acts. a) Dusting off a carpet.b) A swimmer sweeps his hands backward to move ahead in water. [2]

Question 31. State the derived units of : a) momentum b) moment of a force. [2]2. If the pitch of the screw in 1mm, find the reading represented in the following diagram. [3]

3. How will you measure the volume of an object that floats in water? [2]

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4. Fill the blanks: a) 1 μ = __ m.b) 1 picofarad = __ farad.c) 1 gigapascal =___ pascal.[3]

Question 41. Name the mode of transmission of heat through a) solids b) liquidsc) gases d) vacuum.[2]2. Distinguish between heat and temperature [2]3. Give the definitions of the following a) coefficient of linear expansion. b) coefficient of

cubical expansion. [2]4. How do you detect heat radiations? Explain any two phenomena. [4]


Question 51. An object is kept at a distance of 30 cm in front of a convex mirror of focal length 15 cm.

Where is the image formed? Draw a diagram to illustrate this. [3]2. Complete the following ray diagrams. [2]

3. A person is sitting in front of a plane mirror at a distance of 100cm from it. a) where is hisimage formed? b) What is the distance between the person and his image. [2]

4. State the laws of reflection. [2]5. Give any one difference between the real and virtual image. [1]

Question 61. a) What is lateral pressure? b) What is fluid pressure? [2]2. Name any two factors which affect barometric height. [2]3. Mention any two advantages of aneroid barometer over simple barometer. [2]4. Calculate the pressure exerted by 100 cm of vertical length of water column in SI units.

; density of water = 1000 kgm-3] [2]5. In a building, the pressure of water on the ground floor is 1.6 x 105 pa. Calculate the pressure

at the fifth floor at a height of 15 m. [ Take g = 9.8 ms-2; pwater = 1000 kgm-3] [2]

Question71. A cylindrical body of area of cross section 0.0016 m2 and length 1.2 m is completely

A B

D C

C FP

(b)(a)

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immersed in water. Calculate (i) the weight of cylinder in SI system. (ii) upthrust acting onthe cylinder in SI system. [ g = 10ms-2; density of solid = 7200 kgm-3 ] [2]

2. Mention any applications of law of floatation. [2]3. a) Why are bimetallic strips used in automatic fire alarm? b) What is the principle of a

balance wheel? where is it used? [3]4. There is a constant difference in lengths of an iron rod and a brass rod found to be

2cm when they are heated through the same range of temperature. Calculate the length ofeach rod. (Given : Coefficients of linear expansion for iron and brass are 12 x 10-6 /oC and18 x 10-6 /oC respectively). [3]

Question 81. What are bass and shrill effect on the human ear? [2]2. What are material waves? Give any two examples. [3]3. The wavelength of vibrations produced on the surface of water is 1 cm. If the wave

velocity is 20 ms-1, Calculate (i) the number of waves produced in one second (ii) the timerequired to produce one wave. [2]

4. What is Galton’s whistle? To what use is it put? [2]5. Draw a displacement-time graph for a sound wave. [1]

Question 91. Give any two uses of an electroscope. [2]2. a) Define electric conduction. b) What is electrostatic induction? [2]3. Define surface density of charge. What is its unit? [2]4. What are lightning arrestors? Mention any one of its use. [2]5. Draw the distribution of charge on the two conductors given below. [2]

Question 101. Define the terms a) electric potential b) potential difference. [2]2. 50 C of charge is brought from infinity to a certain point in an electric field when 100 J of

work is done. What is the potential at that point? [2]3. Distinguish between a primary cell and a secondary cell. Give any one example for each. [4]4. State any two properties of magnetic lines of force. [2]

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Spericalconductor Conical

Conductor

(a) (b)

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Question 11. a) What is measurement? b) What is a unit? c) What is meant by magnitude of a physical

quantity? [3]2. Express the order of magnitude of the following quantities. a) 0.0278m b) 9.1 x 10-31 kg.[2]3. Define a) Least count of a vernier callipers. b) pitch of a screw gauge. [2]4. What is effective length of a simple pendulum? How is it measured? [2]5. What is a best fit line for a graph? [1]

Question 21. A car covers 100 km in 2 hours towards east. Calculate its velocity in a)kmh-1 b) ms-1. [2]2. Draw a displacement - time graph for a body undergoing uniform motion. [2]3. What do the following graphs represent? [2]

4. A car initially at rest picks up a velocity of 90 kmh-1 in 8 second. Calculate (i) the distancecovered by the car. (ii) the acceleration of the car. [2]

5. What is the significance of a) Slope of a distance - time graph. b) Area of a velocity - timegraph. [2]

Question 31. State Newton’s first law of motion and hence define the term ‘inertia’ . [2]2. A biker along with his bike weighs 200 kg. While driving at a speed of 80 kmh-1 he spots a

man at a distance of 10m from him. Find the retarding force offered by the brakes if hejust avoids a collision with him. [3]

3. What is meant by weight of a body? Mention its SI unit. [2]4. Give any two examples of natural forces. [2]5. Convert 50 kmh-1 into ms-1. [1]

Question 41. a) State pascal’s law. b) Mention any two uses of Hydraulic press. [3]

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2. How does the pressure vary in the following cases? a) When we go from the ground to ahigher altitude. b) When we dive into the sea to reach the sea bed. [2]

3. 1 m vertical height of liquid exerts a pressure of 15000 pa. If g = 9.8ms-2, find the density ofthe liquid. [2]

4. a) Define relative density of a substance. b) what is its unit? c) what is the CGS unit offorce? [3]


Question 51. Write any two differences between heat energy and temperature. [2]2. Give at least two reasons for the choice of a thermometric liquid. [2]3. What is absolute zero? What is its significance? [2]4. When will the two thermometers of Farenheit and Celsius scale show equal but opposite in

values. [2]5. a) what is the SI unit of coefficient of linear expansion? b) What is a bimetallic strip?[2]

Question 61. What is frost bite? what causes it? [2]2. Why does an Igloo, made of snow, keep warm? [2]3. What are sea and land breezes? what causes them? [3]4. Distinguish between reflecting power and absorbing power of a body. [2]5. Mention any ONE use of thermopile. [1]

Question 71. Give any two characteristic of the image formed in a plane mirror? [2]2. What is the principle of a periscope? Give any two uses of periscope. [3]3. Define the following terms for a spherical mirror. a) Pole b) Aperhere c) principle focus. [3]4. Complete the following ray diagrams. [2]

where ‘AB’ is the object in front of the mirrors.

(a) (b)

A

B

FP

B

A

P F CC

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Question 81. If the frequency of a wave is 200 kHz, what is its time period? [2]2. What is the distance between the bell and a person who hears the sound from it after

3Second when it is struck? (Given velocity of sound in air = 345 ms-1 ] [2]3. What is the frequency range of audible sound? [1]4. What is a longitudinal wave? Give an example. [2]5. From the following graph find out the (i) amplitude (ii) time period (iii) frequency of the wave. [3]

Question 91. Draw a diagram to illustrate the function of a lightning conductor. What is its principle? [4]2. What are accumulators? Give an example. [2]3. What do the following symbols represent? [3]

4. Which of the following is a scalar quantity? a) Resistance b) Electric field c) Magneticfield d) electrostatic force of attraction. [1]

Question 101. While transferring 3C of charge through a wire, 20 J is needed. Find the potential differ-

ence across the wire. [2]2. How is the resistance of a wire affected if its a) length is doubled b) radius is doubled

c) temperature is increased. [3]3. Mention any two properties of a bar magnet. [2]4. Will the magnetic field lines ever intersect? Explain. [2]5. Is it possible to isolate the poles of a magnet? [1]

@@@

2 1

1 2 3 4

Displacement (m)

Time(t)second

�

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Question 11. A person travels from Bangalore to Goa in a car for a distance of 600 km and then he

returns to Bangalore in two days. a) what is the total distance travelled by him? b) what isthe displacement after the whole journey? [2]

2. Define uniform acceleration. Give its unit. [2]3. A cricketer throws a ball vertically upwards and collects the ball after ‘t’s. a) what is the

time taken to reach the highest point. b) what is its velocity at that point? [2]4. From the displacement - time graph given below, find a) the total distance travelled by the

body. b) its velocity while reaching point A. c) its acceleration. d) its retardation. [4]

Question 21. Find the order of magnitude of the following: a) 86400 s b) 1.2 x 10-10 m. [2]2. A microscope is provided with a main scale graduated with 20 divisions in 1 cm and a

vernier scale with 25 divisions on it coinciding with 24 divisions of main scale. What is theleast count of the microscope? [2]

3. While measuring the volume of a coin, water is taken in a measuring jar to a level 20.0ml.When a coin is immersed in it the water level rises to 24.2 ml. What is the volume of thecoin? Express the volume in SI unit. [3]

4. What is a seconds pendulum? [1]5. The time periods of two simple pendulums at a place are in ratio 2:1. What will be corre-

sponding ratio of their lengths? [2]

Question 31. While verifying ohm’s law for a conductor, the data obtained are given below. [4]

Plot a graph for V against I. Use the same to find I1 at V1 = 0.3V and I2 at V2 = 1.1V

Find the slope . What is its significance?

50454035302520151050 2 4 6 8 10 12B

Displacement( m)

Time(s)

A

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2. A person sitting on a swing stands up. What happens to the period of the swing ? Explain. [2]3. State whether the following quantities are scalar or vectors. a) Momentum b ) e n e r g y

c) mass d) velocity e) work done f) pressure. [3]4. Express 72 kmh-1 in ms-1. [1]

Question 41. A rod made of an alloy 1m long when heated through 80oC increases its length by 1.62mm.

Calculate the coefficient of linear expansion for the alloy. [2]2. What is the equivalence of a) 1J in erg. 2) 1 calorie in J. [2]3. Name the process of heat transfer in the following cases. a) the hotness of a metallic rod at one

end when it is heated at the other end. b) boiling of water. c) heat energy from the sun. [3]4. The air conditioner in a room is installed near the ceiling. why? [2]5. What is a green house? [1]


Question 51. An object ‘o’ is kept 100 cm in front of a plane mirror M. If the mirror is moved 50 cm

away from the object, how does the image shift from its previous position? [2]2. State the two laws of reflection of light. [2]3. How many images are formed in a pair of plane mirror placed. a) Parallel to each other.

b) Perpendicular to each other. [2]4. Show with a help of a ray diagram, the formation of image by an extended object placed

between the centre of curvature and the principle focus of a concave mirror. a) Is theimage real or virtual? b) Is the image enlarged or diminished? [4]

Question 61. Give an example for (i) inertia of rest (ii) inertia of motion. [2]2. A ball of mass 100 g is initially moving with a velocity of 100 ms-1. While applying a

constant force on the ball for 5 s, it acquires a velocity of 150 ms-1. Calculate a) the initialmomentum of the ball. b) the final momentum of the ball. c) the rate of change of momen-tum. d) the accleration of the ball. e) the magnitude of the force applied. [5]

3. Give two examples of action and reaction. [2]

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4. What is the weight of a body of mass 10 kg? [1]

Question 71. Write any two factors affecting the upthrust due to a liquid on a body. [2]2. A metal cube of side 2 cm and density 8 gcm-3 is suspended by a thread and is completely

immersed in a liquid of density 1.0 gcm-3. What is the tension of the thread? [3]3. Distinguish between density and relative density. [2]4. What is a hydrometer? Name the principle on which it works and state it. [3]

Question 81. State whether each one of the following is a mechanical wave or a non-mechanical wave.

a) sound waves b) radio waves c) sea waves d) seismic waves. e) micro waves f) heatwaves. [3]

2. Mention any two factors that affect the speed of sound in a gas. [2]3. A wave pulse on a string moves a distance of 10 m in 0.05 second. Calculate a) the velocity

of pulse b) the wavelength of the wave on a string if its frequency is 400 Hz. [3]4. a) What is the audible range of frequency for a human ear? b) Expand SONAR. [2]

Question 91. Distinguish between free and valence electrons in an atom. [2]2. Draw a simple atomic model for each of the following: a) Hydrogen atom b) Helium atom. [2]3. Explain the cause of sparking. [2]4. What is meant by ‘quantum nature of charge’? Explain. [2]5. What is the effect on divergence of leaves when a positively charged rod is touched with the

brass disc of a positively charged gold leaf electroscope? Give reason for your answer. [2]

Question 101. Give the symbolic representation of a rheostat. Mention any one of its use. [2]2. Calculate the number of electrons flowing through a conductor carrying 1 m A current. [2]3. Name the physical quantities of which units are (i) ampere (ii) coulomb (iii) ohm (iv) volt. [2]4. Define the following terms. a) Poles of a magnet b) Magnetic axis c) Effective length of

a magnet. [3]5. What is the magnitude of the resultant magnetic field at a neutral point? [1]

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Question 11. If 1 gms-1 = xNs, then what is the value of x? [2]2. What is the SI unit of a) luminous intensity b) Amount of substance? [2]3. 1 hour has 60 minutes or 3600 second. Find the order of magnitudes of minutes & second. [2]4. A vernier callipers has 10 divisions on its vernier scale and on the main scale 1 cm is divided

into 10 divisions. While finding the volume of a solid cylinder, the following observationswere taken. Find its volume in SI unit. [4]

Question 21. Give any two examples of vector quantities. [2]2. When does a concave mirror give a virtual image? Justify your answer with a ray diagram. [3]3. State Newton’s universal law of gravitation. What is the SI unit of universal constant of

gravitation? [2]4. Can Bangalore and Chennai have same value of acceleration due to gravity ‘g’? Why? [2]5. When does water have its maximum density? [1]

Question 31. What is retardation? What is its unit? [2]2. Draw position - time graph of two objects moving in the same direction with unequal

velocities. [2]3. A car moves in a semi circular track of radius 1000 m. What is the displacement of the car

if it starts from one end and stops at the other end? What is the distance travelled by thecar. [3]

4. A ball is thrown vertically up. Draw its velocity - time graph. [1]5. A ball is released from the top of a tower of height ‘h’ m. It takes ‘T’ s to reach ground.

What is the position of the ball in T/3 second with respect to the ground? [2]

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Question 41. An offshore oil rig is expected to withstand stress at depth. If the depth of the ocean is 5

km, ignoring ocean currents, what is the expected pressure? (Take density of sea water =1030 kgm-3) [2]

2. What is the density of solid block which floats in water of density 1000 kgm-3 with 20% ofits volume above water? [3]

3. What is the principle of Hydraulic brakes? [1]4. Mention the SI unit of upthrust. [1]5. A wooden raft of mass 50 kg is floating on the surface of water. Density of the raft is 600

kgm-3 and density of water is 1000 kgm-3. What is the maximum amount of water it candisplace? [3]


Question 51. A scooter of mass 150 kg is moving with a uniform velocity of 80 kmh-1. What is the force

required to stop the vehicle in 10 second? [3]2. Arrange the following natural forces in decreasing order of magnitude. gravitational force,

electrostatic force, nuclear force. [1]3. A bus starts from rest and accelerates uniformly for 10 s to a velocity of 20 ms-1. Then it

runs at a constant velocity for 5s & it comes to rest in the next 5s. Draw the velocity - timegraph of this motion. Find the distance travelled by the bus in this case. [4]

4. What is the time period of a simple pendulum of length 50 cm? (Take g = 10 ms-2 ) [2]

Question 61. Mention any two factors that affect barometric height. [2]2. Why does a fountain pen leak on higher altitudes when it is taken from the ground. [2]3. Define meta-centre of a floating body. Mention the positions of meta-centre when the body

is in a) stable equilibrium b) Unstable equilibrium c) neutral equilibrium. [4]4. Name any two commercial hydrometer. [2]

Question 71. Why do we not prefer water as a thermometric liquid? Give two reasons. [2]2. Convert - 200oC into a) Kelvin b) Fahrenheit scale. [3]3. A metal cube of side 10 cm at 30oC increases by 0.2 cm while heating it to 600oC. Calcu-

late the coefficients of linear, superficial and cubical expansion. [4]4. What is a thermostat? [1]

Question 81. What is lateral inversion? Explain with the help of a diagram. [2]

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2. How many images are formed in two plane mirrors held at an angle of 36o. [2]3. Mention any ONE use of (i) plane mirror (ii) convex mirror (iii) concave mirror [3]4. Complete the following ray diagram. Mention any two characteristics of the image. [3]

Question 91. Mention any two characteristics of medium which alter the speed of sound. [2]2. The distance between three consecutive crests of a wave is 90 cm. If the waves are

produced at the rate of 240/min, calculate the (i) wave length (ii) time period (iii) wavevelocity. [2]

3. What are elastic waves? Give an example? [2]4. What is the magnitude of electric potential on earth? Why? [2]5. A charge of 100 C is brought from infinity to given point in an electric field. Find the electric

potential at that point if the work done is 5J. [2]

Question 101. Draw a neat diagram of Gold leaf electroscope and mention its parts. [3]2. You are provided with two resistors of resistance 2Ω each. Which combination will you

prefer to get the maximum resistance? What is the value of that resistance ? [2]3. What are the three types of magnetic substances ? Give an example for each. [3]4. Define a) isogonic line b)Agonic line [2]

C B F

A

P

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Question 11. Express the following CGS units into their respective SI units. a) 100 dyne b) 30 erg.[2]2. What is the velocity of a) light in kmh-1 (c = 3 x 108 ms-1) b) sound in kmh-1 (v = 330 ms-1)[3]3. Write the following units in the correct form. a) J/kg/k b) 3 milliamps c) 100 mts / sec

d) 100 Newton second. [2]4. a) A vernier callipers has 20 divisions on the main scale in 1 cm. There are 10 divisions

of vernier scale coinciding with 9 divisions on the main scale. What is its least count?[2]b) Mention any one use of the upper jaws of the vernier callipers. [1]

Question 21. a) What is the frequency of a seconds pendulum?

b) On a certain planet, a simple pendulum of length 0.5 m takes 20 second for 20 oscillations.What is the planet’s acceleration due to gravity? [3]c) What is the magnitude of tension developed in a rope such that the rope is pulled by 1000 Nat each end? [2]

2. a) An ice cube floating in a liquid is contained in a beaker. The liquid is completely filled inthe beaker up to the brim. What happens when the ice fully melts? [2]b) Why is the dam of water reservoir thick at the bottom? [2]c) What is the approximate frequency range of ultrasound? [1]

Question 31. Why is wavelength of a radiation preferred as a standard of length? Give two reasons. [2]2. Does a body moving along a circular path have acceleration? [2]3. The gas pedal of an automobile is generally called an accelerator. Mention any other control

that can be also considered as an acclerator? why? [2]4. A car changes its speed from 25 ms-1 to 30 ms-1. Meanwhile a bicycle also goes from rest

to 5 ms-1 . Both take 5s to gain this. Which vehicle undergoes greater accleration ? Whatis the acceleration of each vehicle? [3]

5. What is the significance of accleration - time graph? [1]

Question 41. a) Name the instrument used for measuring the blood pressure. [1]

b) Express the value of 1 atmospheric pressure in SI unit. [1]2. An auto rickshaw travels at the rate of 30 kmh-1 for 5 minutes, then 60 kmh-1 for 10 minutes

and finally at 20 kmph-1 for 3 minutes. Calculate the total distance travelled and averagespeed of the complete trip. [5]

3. Why is a block of ice always covered with saw dust? Explain. [2]

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4. Define coefficient of cubical expansion. [1]


Question 51. What are the strongest and the weakest forces available in nature? [2]2. a) Why is it hard to walk on a slippery surface? [1]

b) What are motions in one dimension, two dimensions and three dimensions? [3]3. A 0.1 kg bullet acquires a speed of 500 ms-1 in a gun barrel of length 1 m. What is the

average force exerted on the bullet ? [3]4. What is the direction of normal reaction of the floor on the body? [1]

Question 61. Give any two examples of periodic motion. [2]2. On the surface of the moon, two astronauts cannot hear each other. Why? [2]3. How long does it take for sound to travel in an iron rail of length 10 km? [Speed of sound

in iron is 5280 ms-1] [2]4. Laplace gave a correction to Newton’s formula for velocity of sound in air as [3]

a) What is γ ? b) What is its unit? c) What is its value in air?5. How does the speed of sound vary with respect to moisture in air? [1]

Question 71. a) What is global warning? [1]

b) What are the effects of global warning (any two)? [2]c) Name any two green house gases? [2]

2. Which mode of heat transfer happens in the following cases? [2] a) Formation of ice on a lake. b) Cooking of rice on a gas stove.3. What is the boiling point of water on Frarenheit scale? [2]4. What is the fastest mode of transfer of heat? [1]

Question 81. Express the image formation in a periscope with a neat

diagram. [3]

2. Complete the following ray diagram. Mention any threecharacteristics of the image. [4]

A

B FCP

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3. What is rectilinear propagation of light? [1]4. Distinguish between a real and a virtual image. [2]

Question 91. Complete the following: [2]

d) 1giga pascal ......... pascal

2. a) What are valence electrons? [1]b) What is a cation? [1]c) Mention the magnitude of the charge of an electron. [1]

3. a) What happens to a negatively charged gold leaf electroscope, when an uncharged metalrod is brought near the brass disc? [1] b) What kind of charge is acquired by an ebonite rod rubbed with fur? [1]

4. Draw the simple atomic model of the lithium atom whose atomic number is three. [1]5. Draw an electrical circuit diagram consisting of the following components. a) D.C source

b)Rheostat c) 2 resistance in series d) Volt meter e) plug key f) Ammeter. [2]

Question 101. State and define the SI unit of potential difference. [2]2. A wire of length 2m has a resistance 5Ω. What happens to its resistance if its length is

increased to 4 m ? [2]3. Give any two properties of magnetic field lines? [2]4. Is magnetic field a vector or a scalar? [1]5. Draw the diagrams of the following:

a) Bar magnet. b) Horse shoe magnet. c) Magnetic needle. [3]

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Question 11. a) Distinguish between a body and a particle. [5]

b) (i) Define uniform acceleration.(ii) Draw V - T graph of a particle undergoing uniform acceleration.(iii) What is the significance of the slope of a V-T graph?

2. a) How the value the acceleration due to gravity ‘g’ change with [5](i) depth (ii) altitude.b) On a fast driving lane, after sighting the green signal, a driver starts his car and reachesa speed of 100 kmp-1 in 6s. He drives at the same speed for 12s. He spots the followingred sign and brings the car to rest in 3s. Draw the velocity - time graph for the abovemotion? what is the total distance travelled by time?

Question 21. Mud guards are provided behind the wheels of vehicles. Why? [2]2. A bullet of mass 0.025 kg and a shell of mass 500 kg are fired simultaneously and they

reach the same target 100 m away in 1.5s and 3s respectively. Find their momentum.[3]3. What are contact forces? Give any two examples. [3]4. State whether the following are scalars or vectors. a) Momentum b) Pressure c) energy

d) momentum of a force. [2]

Question 31. What are magnetic lines of forces ? State one of their properties. [2]2. Name any two factors affecting the process of conduction of heat in a metal rod. [2]3. How does the pressure change when we go from

a) ground level to higher altitude? [2]b) Surface of water to the bottom of a swimming pool?

4. Give any two distinctions between luminous and non luminous bodies. [2]5. Mention any two disadvantages of using alcohol to a thermometric liquid. [2]

Question 41. Calculate the weight of a body of mass 30 kg in (i) kgf and (ii) newton. [2]2. What is ‘force of friction’ ? In which direction does it act? [2]3. Define a) couple b) moment of a couple. [2]4. Two children of masses 30 kg and 60 kg are sitting on one side of a see-saw at distances

2m and 2.5m respectively from the middle. Where should a man of mass 80 kg sit tobalances the see saw? [4]

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Question 51. Why does a thick - glass tumbler often crack when extremely hot or cold liquid is poured in

it? [2]2. A brass rod of length 2 m is heated through a temperature of 80oC. It increases in length by

1.65 mm. What is the coefficient of linear expansion for brass? [2]3. A thermometer is marked with fixed points 10 and 90. What is the correct temperature in

oC if it reads 60o? [2]4. In the following diagram mark any four significant winds due to convection of heat. [4]

Question 61. a) What is meant by rectilinear propagation of light? [2]

b) What is the order of wavelength of light?2. a) Why are shadows caused? [3]

b) With a help of a diagram, show the formation of shadow due to (i) a point source of light(ii) an extended source of light.

3. a) How is the shadow caused when the source is bigger than the opaque body? Usediagram to explain.b) Why does a bird flying high cast no shadow on the earth? [5]

Question 71. What is a longitudinal wave? Give an example. [2]2. (i) Where does sound travel the fastest? [1]

(ii) What are the effects of the following factors on the velocity of sound in air? [4]a) wave length b) pressure c) direction of wind d) temperature.

3. The following diagram gives the displacement - distance graph of a sound wave. Find a) thewave length b) the frequency c) the amplitude of the wave. [ given the wave velocity is 330ms-1] [3]

Displacement

cm

↑

2.0

-2.0

0.4 0.8 1.2 1.6Distance (m)

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Question 81. A glass rod is rubbed on a silk cloth. How are the charges ditributed in both? [2]2. Give any two uses of gold leaf electroscope? [2]3. What is the function of a rheostat? What is its symbol? [2]4. List any two types of magnetic materials. [2]5. In a circuit, when the rheostat is adjusted, the voltemeter reads 5v. What would be the

current in the ammeter if the resistance of the two bulbs in series are 1Ω each? [2]

Question 91. Calculate the total thrust on a square plate of side 5 m placed horizontally 2 m below the

surface of water. (Given: Density of water = 103 kgm-3; g = 9.8 ms-2; atmospheric pressure= 1.013 x 105 pa) [2]

2. a) State Archimedes principle. [1]b) What is meant by the term buoyancy? [1]

3. Calculate the fraction of iron that floats in mercury contained in a beaker. The densities ofiron and mercury are 7.8 gcm-3 and 13.6 gcm-3 respectively. [2]

4. A solid sphere weighs 70 gf in air and 62 gf when completely immersed in water. Calculate:(i) the volume of the solid. (ii) the upthrust (iii) the relative density of the solid. [3]

5. Express the density of copper in SI unit if it is 8.83 gcm-3 in the CGS system. [1]

Question 101. What is a hydrometer? State the principle on which it works? [2]2. Complete the following ray diagrams using the principle of reflection of light. [2]

3. An object of height 2 cm is placed at a distance of 10 cm infront of a concave mirror offocal length 5 cm. Find the position size and nature of the image by drawing. [4]

4. State the kind of mirror used (i) in the periscope (ii) in the search light reflector. [2]

@@@

C F P

(a) (b)

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A.E.A The Professional coaching Academy for I.C.S.E IX & X ... · PDF filePhysics Paper 1 Section I (40 Marks) (Answer all the Questions) ... State Pascal’s law. ... Question 4 1