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ICSE Class X Sample / Model Paper 2021 : Physics

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Soumya Roy
Sikkim Manipal University (SMU), Gangtok
Master of Computer Application Computer Application
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MADHUSTHALI VIDYAPEETH F.M 80 Time 2h Date : PRE-BOARD II EXAMINATION: 2020-2021 SUBJECT: PHYSICS CLASS- X Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of paper is the time allotted for writing the answers. Section I is compulsory. Attend any four questions from Section II. The intended marks of questions or parts of questions are given in brackets [ ]. SECTION - I (40 Marks) Attempt all question from this Section. Question 1 (a) (i) Define moment of force (ii) Write the relationship between the SI and CGS unit of moment of force. (b) Define a kilowatt hour. How is it related to joule? (c) A satellite revolves round a planet in a circular orbit. What is the work done by the satellite at any instant? Give a reason. (d) (i) Identify the class of the lever shown in the diagram: (ii) How is it possible to increase the M.A of the above lever without increasing its length"' (e) Give one example of each when: (i) Chemical energy chasers into electrical energy. (ii) Electrical energy changes into sound energy Question 2 (a) An electromagnetic radiation is used for photography in fog. [2] (i) Identify the radiation. (ii) Why is this radiation mentioned by you, ideal for this purpose? (b) (i) What is the relation between the refractive index of water with respect to air (a w) and the refractive index of air with respect to water (w a). (ii) If the refractive index of water with respect to air (a w) is 5/3. Calculate the refractive index of air with respect to water (w a). [2] (c) Specific heat capacity of a substance A is 3,800 Jkg-1K-1 and that of a substance B is 400 Jkg-1K-1. Which of the two substances is a good conductor of heat? Give a reason for your answer. [2] (d) A man playing a flute is able to produce notes of different frequencies. If he closes the holders near his mouth, will the pitch of the note produced, increase or decrease? Given a reason. [2] 1 (e) The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42 . Complete path of the ray PQ till it emerges out of the block. [Write necessary angles.] [2] Question 3 (a) Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below. [2] Study the two sound waves and compare their: (i) Amplitudes (ii) Wavelengths (b) You have three resistors of values 2 , 3 and 5 . How will you join them so that the total resistance is more than 7 ? [2] (i) Draw a diagram for the arrangement. (ii) Calculate the equivalent resistance. (c) An electric bulb of 300 ohm draws a current of 0.4 A. Calculate the power of the bulb and the potential difference at its ends. [2] (d) (i) What do you understand by free vibrations of a body? (ii) Why does amplitude of a vibrating body continuously decrease during damped vibrations? [2] (e) A solid of mass 50 g at 150 is placed in 100 g of water at 11 , when final temperature recorded is 20 . Find the specific heat capacity of the solid. (specific heat capacity of water = 4.2 J/g/ ) [2] Question 4 (a) (i) Flow can a temperature in degree Celsius be converted into S.I. unit of temperature? (ii) A liquid X has the maximum specific heat capacity and is used as a coolant in Car radiators. Name the liquid X. [2] (b) A solid metal weighing 150 g melts at its melting point of 800 C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal? [2] (c) Identify the following wires used in a household circuit: (i) The wire is also called as the phase wire. (ii) The wire is connected to the top terminal of a three-pin socket. [2] 2 (d) (i) What are isobars? (ii) Give one example of isobars. [2] (e) When does the nucleus of an atom tend to be radioactive? [2] SECTION II (4 Marks) Attempt any four question from this Section Question 5 [3+3+4=10] (a) The figure below shows a simple pendulum of mass 200 g. It is displaced from the mean position A to the extreme position B. The potential energy at the position A is zero. At the position B the pendulum bob is raised by 5 m. (i) What is the potential energy of the pendulum at the position B? (ii) What is the total mechanical energy at point C? (iii) What is the speed of the bob at the position A when released from B? (Take g = 10 ms-2 and that is no loss of energy.) (b) (i) With reference to the direction of action how does a centripetal force differ from a centrifugal force during uniform circular motion. (ii) Is centrifugal force the form of reaction of centripetal force? (iii) Compare the magnitude of centripetal and centrifugal force (c) A block and tackle system of pulleys has velocity ratio 4. (i) Draw a neat labelled diagram of the system indicating clearly the points of application, and direction of load and effort. (ii) What will be its V.R if the weight of the movable block is doubled? Question 6 [3+3+4=10] (a) A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens. (i) Name the lens. (ii) Draw a ray diagram to show the image formation. (b) An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Find: (i) the position of the image (ii) nature of the image (c) (i) How does the angle of deviation formed by a prism change with the increase in the angle of incidence? Draw a graph showing the variation in the angle of deviation with the angle of incidence at a prism surface. (ii) How does the angle of deviation formed by a prism related with the angle of incidence, angle of prism and angle of emergence? 3 Question 7 [3+3+4=10] (a) It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums. (i) Name the characteristic of sound associated with the above observation. (ii) Given a reason for the above observation. (b) A pendulum has a frequency of 4 vibrations per second. An observer starts the pendulum and fires a gun simultaneously. He hears the echo from the cliff after 6 vibrations of the pendulum. If the velocity of sound in air is 340 m/s, find the distance between the cliff and observer. (c) Two pendulums C and D are suspended from a wire as shown in the figure given below. Pendulum C is made to oscillate by displacing it from its mean position. It is seen that D also starts oscillating. (i) Name the type of oscillation, C will execute. (ii) Name the type of oscillation, D will execute. (iii) If the length of D is made equal to C then what difference will you notice in the oscillations of D? (iv) What is the name of the phenomenon when the length of D is made equal to C? Question 8 [3+3+4=10] (a) (i) Heat supplied to a solid changes it into liquid. What is this change in phase called? (ii) During phase change does the average kinetic energy of the molecules of the substance increase? (iii) What is the energy absorbed during the phase change called? (b) The melting point of naphthalene is 80 C and the room temperature is 30 C. A sample of liquid naphthalene at 100 C is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process. Question 9 [3+3+4=10] (a) (i) what are superconductors? (ii) Calculate the current drawn by an appliance rated 110 W, 220 V when connected across 220 V supply. (iii) Name a substance whose resistance decreases with the increase in temperature. (b) The diagram shows three resistors connected across a cell of e.m.f. 1.8 V and internal resistance. Calculate: 4 (i) Current through 3 resistor. (ii) The internal resistance r. (c) The diagram shows a circuit with the key k open. Calculate: (i) the resistance of the circuit when the key k is open. (ii) the current drawn from the cell when the key k is open. (iii) the resistance of the circuit when the key k is closed. (iv) the current drawn from the cell when the key k is closed. Question 10 [3+3+4=10] (a) An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an alpha particle and is transformed into a nucleus B. (i) What is the composition of B? (ii) The nucleus B emits a beta particle and is transformed into a nucleus C. What is composition of C? (iii) What is mass number of the nucleus A? (b) The ore of Uranium found in nature contains 92U238 and 92U235. Although both the isotopes are fissionable, it is found out experimentally that one of the two isotopes is more easily fissionable. (i) Name the isotope of Uranium which is easily fissionable. (ii) Write a nuclear reaction when U-238 emits an alpha particle to form a Thorium (Th) nucleus. (iii) State one safety precaution in the disposal of nuclear waste. (c) Radiations given out from a source when subjected to an electric field to n direction perpendicular to their path arc shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C. 5 (i) Name the radiation B which is unaffected by the electrostatic field. (ii) Why does the radiation C deflect more than A? (iii) Which among the three causes the least biological damage externally? (iv) Name the radiation which is used in carbon dating. 6

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