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Smt. Sulochanadevi Singhania School, Thane 2nd Prelim Physics Paper Std :10 Max. Marks - 80 Time -2hr Date-04.02.16 SECTION 1 ANSWER ALL THE QUESTIONS: Q1. (I)(a) What happens to the heat supplied to a substance when the heat supplied causes no change in the temperature of the substance? b) Give one example where high specific heat capacity of water is used as a heat reservoir. (1+1) (ii) Define the term specific latent heat of fusion of a substance. (2) (iii)A stretched wire 0.8m long is made to vibrate in two different modes as shown in the figure A and B given below. (2) (A) (B) a) Compare the wavelength of A and B b) In which case is the note produced is louder? Give a reason for your answer. (iv) An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and receiving of the wave is 1.5s. Calculate the depth of the sea if the velocity of sound in sea water is 1400m/s. (2) (v) In the given figure a ray of light is incident at an angle of 59 at the midpoint of the side PQ of a rectangular slab PQRS. The refractive index of glass is 1.7; the angle of refraction is 30 . Complete the path of the ray (sin 36 =0.5882) (2) P S Q R 59
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