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XI Physics Sample paper 2 Pre Board Feb 2022 Time 1.5 hr MM 35, Instructions:, 1. The question paper consists of 21 questions. All questions are compulsory., 2. Question no. 1 to 13 will carry 1 mark each. These questions are very short, answer type. There will be internal choice in question 11., 3. Question no. 14 to 17 will be of two marks each. There will be internal choice in, question 17., 4. Question no. 18 to 20 will be of three marks each. There will be internal choice, in all questions., 5. Question no. 21 will be of five marks. There will be internal choice in it., Section A : 1 Mark questions:, 1. Why is gravitational potential energy always negative?, 2. Name two factors which determine whether a planet has an atmosphere or not., 3.Where does a body weigh more – at the surface of Earth or in a mine?, 4. What are ductile materials?, 5. What is the dimensional formula for coefficient of viscosity?, 6. Define molar specific heat capacity. Write its SI unit and dimensional formula., 7. Define thermal capacity. Write its SI unit and dimensional formula., 8. Write statement of first law of thermodynamics., 9. Out of three quantities in thermodynamics first law namely dQ, dU and dW, which one depends, on path (state function) and which one does not?, 10. Give one examples each of isothermal and adiabatic processes., 11. Only write (without derivation) the expression of pressure exerted by a gas., OR, -3, If density of air (ρ) is 1.3 Kg m and root mean square speed (C) of the gas molecules is 400 ms -1,, then find the pressure exerted by the gas., 12. What is the difference between periodic and oscillatory motion., 13. What are stationary waves?, Section B : 2 Marks questions:, 14. The stress-strain graphs for materials A and B are shown in figure., , The graphs are drawn to the same scale., (a) Which of the materials has the greater Young’s modulus?, (b) Which of the two is the stronger material?, 15. State (i) Kelvin Plank statement (ii) Clausius statement of second law of thermodynamics?, 16. Write expression for average speed, RMS speed and most probable speed and write them in, decreasing order of magnitude.
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𝐵, , 17. How Newton arrived to the speed of sound in a gas using the formula v = √𝜌 ? What was error, in it., Given density of air = 1.3 Kg m -3 and Patm = 1.013 × 105 N/m2, OR, How Laplace corrected the formula of speed of sound in air?, Section C : 3 Marks questions:, 18. State Kepler’s laws of planetary motion., OR, Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way, down to the centre of the earth if it weighed 250 N on the surface?, 19. Drive an expression for work done during an adiabatic process., OR, An electric heater supplies heat to a system at a rate of 500 W. If system performs work at a rate of, 100 joules per second at what rate is the internal energy increasing?, 20. Show that the bob of a simple pendulum when taken to extreme position and then released will, undergo SHM. Also find the expression for time period of simple pendulum., OR, What are undamped and damped oscillations? Give at least one example of each., Section D : 5 Marks questions:, 21. Obtain the expression for excess of pressure inside liquid drop and soap bubble., OR, Define surface tension, capillary and capillarity. Derive expression for the rise of liquid in a capillary, tube., , BY HEAD OFFICE, PPPP SCIENCE SEN SEC STATE TEAM
