Formatting page ...
MOCK EXAMINATION PHYSICS Grade: 10 Date: 26.12.2019 Time: 2 Hours Max .Marks: 80 General Instructions: 1. Answers to this paper must be written on the paper provided separately. 2. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. 3. The time given at the head of the paper is the time allotted for writing the answers. 4. Attempt all questions from Section I and any four questions from Section II. 5. The intended marks of questions or parts of questions are given in brackets [ ]. Section 1 (40 Marks) Attempt all questions from this section. Question 1 [10] (a) State Snell s law of refraction of light. (b) The refractive index of glass is 1.5 and that of water is 1.3. If the speed of light in water is 2.25 10 ms , what is the speed of light in glass? (c) State the difference between music and noise. (d) The coolant in a chemical or nuclear plant (i.e. the liquid used to prevent different parts of a plant from getting too hot) should have high specific heat. Comment. (e) The refractive indices of four substances P, Q, R and S are 1.20, 1.36, 1.77 and 1.31, respectively. The speed of light is maximum in which substance? Question 2 [10] (a) Sound waves travel with a speed of about 330 m/s. What is the wavelength of sound whose frequency is 550 Hz? (b) If you want to hear a train approaching from far away, why is it more convenient to put your ear to the track? (c) How is skating possible on snow? (d) Can water be boiled without heating? If yes, explain how it is possible?
|
