ICSE Board Sample Paper
Subject – Physics
Class - 10th
1. (a) Differentiate between work and power. 2
(b) Define the term potential energy of a body. How is it measured? 2
(c) Give an example for each of the following uses of machine : 2
(i) to obtain gain in force.
(ii) to obtain gain in force.
(d) Derive the relation between C G S and S I unit of force. 2
(e) Derive the relation between force mass and acceleration. 2
2. (a) A body of mass 4 kg initially at rest is subjected to a force of 16N. What is the Kinetic Energy required by the body at the end of 10 seconds? 2
(b) Define the term convex and concave lens. 2
(c) Name the lens that always forms a virtual and erect image. 2
(d) Draw a ray diagram to illustrate how a ray of light incident obliquely on one face of a rectangular glass slab of uniform thickness emerges. 2
(e) What do you understand by the deviation produced by a prism? State the factors on which the angle of deviation depends. 2
3. (a) Name two factors on which the refractive index of a medium depends? 2
(b) Name four colours of the spectrum of white light which have wavelength longer than blue light. 2
(c) The steam pipes warm a building more effectively than the hot water pipes both being at 100º C, in cold countries. Explain. 2
(d) What is an ohmic conductor? Give examples of ohmic conductors. 2
(e) Calculate the wavelength of an electromagnetic wave of frequency 15 MHz. 2
4. (a) What is a Solenoid and how can the strength of it be increased. 2
(b) State ohms law. 2
(c) State two uses of a cathode ray tube. 2
(d) If 10125 J of heat energy boils 4.5 g of water at 100º C to steam at 100º C. Find the specific latent heat of steam. 2
(e) Four resistors each of resistance 2 Ω are connected in parallel. What is the effective resistance? 2
Section – II (40 Marks)
Answer any four questions.
5. (a) A machine raises a load of 750 N through a height of 16 m in 5 s. Calculate : (i) work done by machine, (ii) power at which the machine woks. 3
(b) Draw a neat labeled ray diagram to locate the image formed by a magnifying glass. State three characteristics of the image. 4
(c) Explain briefly how white light gets dispersed by a prism with the aid of a neat labeled diagram. 3
6. (a) A man exerts a force of 200 N in pulling a cart at a constant speed of 16 ms –1. Calculate the power spent by man. 3
(b) (i) Name the seven prominent colour of visible spectrum.
(ii) What are the primary, the secondary and the complementary colours. Name two primary and two secondary colours. 4
(c) A boy hears an echo of his own voice from a distant hill after 1 second. The speed of sound in air is 350 ms –1.Calculate the distance of the hill from the boy. 3
7. (a) On what basis would you classify an energy source as renewable? State two advantages and two limitations of the energy received from the Sun. 3
(b) (i) Define work function of a metal.
(ii) State two factors on which the rate of emission of thermions depend. 3
(c) (i) State two precautions that must be taken while handling a radioactive source.
(ii) Mention two possible sources of background radiation. 4
8. (a) An electric bulb is marked 220V-60W. The bulb is connected to a supply of 220V. Calculate ; 3
i. Resistance of the filament
ii. Current flowing through its filament
(b) (i) A ball of mass 200g is at a height of 50m. If the acceleration due to gravity is 10m/s, what is the potential energy of the block?
(ii) If the ball is allowed to fall through a height of 20m, calculate the loss of potential energy. 3
(c) A bullet of mass 50g is moving with a velocity of .5km/s. It penetrates 100mm into still target and comes to rest. Calculate;
i. the kinetic energy possessed by the bullet
ii. the avg. Retarding force offered by the target 4
9. (a) How many α and β particles are emitted when 238U92 changes to 206Pb82 . 3
(b) Why should the lowest block of the block and tackle system be of negligible weight? 3
(c) Draw a labelled diagram of an alternating current generator. Write the function of its two main parts. 4
10. (a) In Mrs. Pinto’s flat there are 6 bulbs of 100 W each, a heater of 2 kW and 5 fans of 50W each. If these are used everyday as shown below, calculate the cost of energy consumption for a month of 30 days at the rate of Rs.3.50 per kW h. 3
i. 6 bulbs of 100 W each used 8 h per day
ii. 1 heater of 2 kW used half hour daily
iii. 5 fans of 50 W each are used 6 h everyday.
(b) (i) Define Radioactivity.
(ii) A radioactive substance is oxidized. What change would you expect to take place in the nature of its radioactivity? Give a suitable reason. 3
(c) Draw a rough labeled diagram of a D.C. motor. When will the couple action on a coil be (i) maximum and (ii) minimum. 4