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ICSE Physics Model paper

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Sample Paper 2013 Class X Subject PHYSICS Time 11/2Hour Full Marks 80 Section 1 (Attempt all questions) 40 marks 1) (a) A thread having stone tied at its one end is whirled in a horizontal circle. Name the force which provides the centripetal force. [2] (b) A train is travelling on level track at a speed of 72 km/h. It is pulled by an engine which exerts a force of 12000 N. Calculate the power of the engine in kilowatt. [2] (c) What is an inclined plane? Give two examples of its use in daily life. [2] (d) A load of 800 N is lifted through a height of 2 m by an effort of 40 N applied at a distance of 50 m. Calculate efficiency. [2] (e) A ball of mass 8 kg is dropped from a height of 10 m. What is the velocity with which it strikes the ground? [2] 2) (a) When a bird looks at a fish in water, does it appear raised or deeper than it actually is? When a fish looks at a bird does it appear nearer or further away? [2] (b) Complete the diagram by drawing the corresponding incident ray. [2] (c) Mention four uses of a hand lens. (d) Two convex lenses each of focal length f are separated by a distance equal to 2f. Show with the help of a ray diagram that a parallel beam of light, after refraction through the lenses remains parallel. [2] (e) Write two uses of ultraviolet radiations. [2] 3) (a) PQ is the incident ray on a prism ABC as shown. Show the corresponding refracted and emergent rays. [2] (b) Which of the quantities (i) frequency, (ii) wavelength and, (iii) amplitude determines the loudness of a sound wave? How is loudness related to the quantity mentioned above? [2] (c)1080g of ice at 0 0 C is mixed 1080g of water at 800 C. Calculate the final temperature of the mixture. [2] (d) Whose molecules, ice at 0 0 C or water at 0 0 C have greater potential energy? Why? [2] (e) Which lamp has greater potential energy a 40W lamp or a 60W lamp when connected to the same supply? [2] 4) (a) Can you connect resistors of 2 , 3 , and 6 to produce an effective resistance of 4 ? If yes how? [2] (b) State the factor on which e.m.f of a cell depends. [2] (c) Ad.c motor is rotating in an anticlockwise direction. How the direction of rotation can be reversed? [2] (d) (i) What is background radiation? (ii) Name the two wires of household wiring circuit which are at the same potential. [2] (e) Complete the following reaction by inserting the appropriate quantity in the spaces marked by asterisks. 235 U92 + *n0 *Sb51 +99Nb*+ 4 1n0 + * [2] Section 2(Attempt any four questions) 40 marks 5) (a) A man drops a stone from the top of a ladder of length 10 m. What is its kinetic energy when it reaches the ground? What is its speed just before it hits the ground? [2] (b) Can a body have i) energy without momentum? ii) Momentum without energy? Iii) If an elephant and a rat both run with same kinetic energy, who will win the race? [4] (c) i) Give the principle of levers. ii) Give the SI units of the following: a) M.A b) V.R c) Weight d) Mass iii) What is the relation between V.R and the number of strands of string used to support the load in a block and tackle system? [4] 6)a) Why does the moon, purely white during the day, has a yellow hue after sunset? [3] b) Why is a concave lens called diverging? Explain. [3] c) i) What is a total reflecting prism? ii) Ozone layer gives us protection from which part of the solar radiation? iii) If the amplitude of a wave is tripled, what will be the effect on its loudness? [4] 7) a) i) state the difference between tone and note. ii) A violin note and a sitar note of same frequency can be distinguished separately, explain how? [3] b) why do empty vessels make a lot of noise? [3] c) State the basic principle of heat transfer. A piece of ice, of mass 15g is added to water of mass 100g in a copper calorimeter of mass 50g. The temperature of water is 15 0 C but falls to 3 0 C after addition of ice. Calculate the specific latent heat of fusion of ice. Given Specific heat capacity of copper = 0.42 j/g 0 C Specific heat capacity of water = 4.2 j/g 0 C [4] 8) a) A piece of ice of mass 15g is added to water of mass 100g in a copper calorimeter of mass 15g. The temperature falls to 276K from 288K after the addition of ice. Calculate the latent heat of fusion of ice. Given,Specific heat capacity of copper = 0.42 j/g 0 C Specific heat capacity of water = 4.2 j/gK b) A monochromatic point source O is viewed by an observer through a prism. Complete the diagram to show how the image I is formed and seen by the observer [3] c) What is an echo? State three conditions for the formation of an echo. [4] 9) a) i) Find the value of R in the following figure if equivalent resistance between the terminals A and B is 2 ii) In the figure given below A, B and C are three ammeters. The ammeter B reads 0.5A Calculate (a) The readings in the ammeters A and C. (b) the total resistance of the circuit. [4] b) A house is fitted with 20 lamps of 60W each, 10 fans consuming 0.5A each and an electric kettle of resistance 110 . If the energy is supplied at 220V and costs Rs. 3.25 per KWh, calculate the bill for November while running these appliances for 6 hours a day.[3] c) Sketch a labeled diagram of an A.C generator. State its principle. [3] 10) Explain briefly the function of the following: a) i) A three pin socket ii) A main switch [3] b) With the help of a labeled diagram state the function of a step up transformer. [3] c) What is the difference between: i) A particle and an electron? ii) an particle and a helium nucleus? [2] d) Draw a labeled diagram of electron gun of a hot cathode ray tube. [2]

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