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Shri Vile Parle Kelavani Mandal s C.N.M. School & N.D. Parekh Pre-Primary School CLASS DATE TERMINAL EXAMINATION 2020 - 21 X 18.12.2020 PHYICS The number of printed pages is 6. TIME 2 hours MAX MARKS 80 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 this paper is the time allowed for writing the answers. This paper is divided into TWO Sections, Section A and Section B. You are to answer all questions from both the sections. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION A (40 Marks) ( Attempt all questions from this Section ) Question 1 (a) (i) State the S.I. unit of potential energy. [2] (ii) Define the unit named by you in (i). (b) Define latent heat of a substance. State it s S.I. unit. [2] (c) Draw the diagram of a single fixed pulley. [2] (d) Where is the centre of gravity of the following objects situated ? [2] (i) Equilateral triangle (ii) Solid cone. _____________________________________________________________________________ Std-10 Physics Terminal Examination 2020-21 Page 1 of 6 (e) Copy the diagram and complete it till the ray of light emerges out of the P O air [2] Q 0 48 A glass block S R glass block PQRS. The critical angle for the glass air surface is 420. Question 2 (a) State the principle of mixtures. [2] (b) Draw a labelled diagram to show the path of a monochromatic ray of light in a prism [2] kept at its angle of minimum deviation. (c) (i) Define dispersion of light. [2] (ii) What do you understand by the term spectrum ? (d) Two bodies of equal masses are placed at heights h and 2h. Find the ratio of their [2] gravitational potential energies. (e) The power of a lens is 5 D. Find the focal length of the lens and state its nature. [2] Question 3 (a) State two points of difference between centripetal and centrifugal forces. [2] (b) What does SONAR stand for ? State the principle of a SONAR. [2] (c) (i) State the nature of a concave lens. [2] (ii) Define second focal plane of a convex lens. _____________________________________________________________________________ Std-10 Physics Terminal Examination 2020-21 Page 2 of 6 (d) State two internal sources of background radiations. [2] (e) Drinks get cooled more quickly by adding pieces of ice at 0 0C than the ice-cold water [2] at 0 0C . Give reason. Question 4 (a) If 229 88 X disintegrates and emits two -particles, represent this reaction in the form of [2] an equation assuming that the new nucleus (daughter nucleus) formed is Y. State the number of electrons in Y. (b) A vibrating pendulum doesn t produce sound. Do you agree with this statement? Explain. [2] (c) A single fixed pulley and a movable pulley both are used separately to lift a body [2] of mass 100 kg to the same height. Compare the efforts applied. (d) An object placed at the bottom of a water tank appears raised up by 2 m. If the [2] refractive index of water with respect to air is 4/3, what is the actual depth of the water tank? (e) A uniform meter scale is in equilibrium as shown below. The weight (W) of the [2] meter scale is acting vertically downwards from the point M. Calculate the mass of the meter scale. Given that AC = 5 cm, AO = 30 cm, AM = 50 cm, AB = 100 cm. 0 A 5cm 30cm 50cm 100cm C O M B 40 gf W _____________________________________________________________________________ Std-10 Physics Terminal Examination 2020-21 Page 3 of 6 SECTION B (40 Marks) ( Attempt all questions from this Section ) Question 5 (a) (i) What do you mean by uniform circular motion ? [3] (ii) State the principle of moments. (b) The velocity of the bob of a simple pendulum at its mean position is 2 m s-1. Find the [3] maximum vertical height that it will attain on reaching at its extreme position if 30 % of its energy is lost in overcoming the friction of air. [ g = 10 m s-2] (c) (i) What is the power of a pump which takes 10 seconds to lift 200 kg of water to [4] a water tank situated at a height of 20 m ? [ g = 10 m s-2 ] (ii) State the transformation of energy taking place in the following cases while in use: loudspeaker, while charging a battery. Question 6 (a) (i) Where should an object be placed so that a real and inverted image of the same size [3] as the object is obtained using a converging lens ? (ii) Draw a ray diagram to show the formation of the image as specified in the part (i). (b) The focal length of a convex lens is 20 cm. Where should an object be placed to obtain [3] a virtual image of twice the size of the object ? _____________________________________________________________________________ Std-10 Physics Terminal Examination 2020-21 Page 4 of 6 (c) In the diagram below, a ray of light AB incidents normally on the face PQ of an [4] equilateral glass prism. P Q R (i) What are the angles of incidence on the faces PQ and PR ? (ii) Copy and complete the ray diagram till the ray of light emerges out of the prism. Question 7 (a) (i) Name the waves used for echo depth sounding. [3] (ii) Give one reason of their use for the above purpose. (iii) Define resonance. (b) 1200 J of heat energy is required to raise the temperature of 0.92 kg of lead from 20 to [3] 30 . Calculate the specific heat capacity of lead. (c) (i) Is the efficiency of a machine in actual practice always less than 100% ? Why ? [4] (ii) Derive the relation between mechanical advantage (M.A.), velocity ratio (V.R.) and efficiency ( ). _____________________________________________________________________________ Std-10 Physics Terminal Examination 2020-21 Page 5 of 6 Question 8 (a) An electromagnetic wave has wavelength 1000 . (i) Name the wave. (ii) What is the speed of the wave in vacuum ? (iii) State one use of the wave. [3] (b) State any three safety precautions while handling radioactive materials. [3] (c) (i) What are isotopes ? Give one example. [4] (ii) Define radioactivity. (iii)Alpha particles are negatively charged particles. State true or false. The End _____________________________________________________________________________ Std-10 Physics Terminal Examination 2020-21 Page 6 of 6

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