Page 1 CBSE | Physics Sample Paper 8 Solution CBSE Board Class XI Physics Sample Paper-8 Solution 1. 2. While swimming, a person pushes the water backwards, and as a result he himself is pushed forward by the reaction force exerted by the water on him. 3. The angle of repose is defined as the angle of the inclined plane at which a body placed on it, just begins to slide. In the figure Thus, the coefficient of limiting friction is equal to the tangent of the angle of repose. Page 2 CBSE | Physics Sample Paper 8 Solution CBSE Board Class XI Physics Sample Paper-8 Solution 1. 2. While swimming, a person pushes the water backwards, and as a result he himself is pushed forward by the reaction force exerted by the water on him. 3. The angle of repose is defined as the angle of the inclined plane at which a body placed on it, just begins to slide. In the figure Thus, the coefficient of limiting friction is equal to the tangent of the angle of repose. CBSE | Physics Sample Paper 8 Solution 4. Mass, m = 75 kg; 5. No. The correct unit of torque is newton-metre, and not joule. This is done to create a difference between the scalar nature of work and the vector nature of torque. 6. The graph of h vs r is 7. 8. Wave motion 9. (i) M 3/2 L -1/2 T -2 (ii) M 1/2 L -3/2 T 0 Page 3 CBSE | Physics Sample Paper 8 Solution CBSE Board Class XI Physics Sample Paper-8 Solution 1. 2. While swimming, a person pushes the water backwards, and as a result he himself is pushed forward by the reaction force exerted by the water on him. 3. The angle of repose is defined as the angle of the inclined plane at which a body placed on it, just begins to slide. In the figure Thus, the coefficient of limiting friction is equal to the tangent of the angle of repose. CBSE | Physics Sample Paper 8 Solution 4. Mass, m = 75 kg; 5. No. The correct unit of torque is newton-metre, and not joule. This is done to create a difference between the scalar nature of work and the vector nature of torque. 6. The graph of h vs r is 7. 8. Wave motion 9. (i) M 3/2 L -1/2 T -2 (ii) M 1/2 L -3/2 T 0 CBSE | Physics Sample Paper 8 Solution 10. 11. 12. Work done is defined as the product of component of force along the direction of motion and displacement. 13. 2 / 0.05 2 / 50 1000 / 10 / ? ? ?? v k cm s m s ? ? ? Page 4 CBSE | Physics Sample Paper 8 Solution CBSE Board Class XI Physics Sample Paper-8 Solution 1. 2. While swimming, a person pushes the water backwards, and as a result he himself is pushed forward by the reaction force exerted by the water on him. 3. The angle of repose is defined as the angle of the inclined plane at which a body placed on it, just begins to slide. In the figure Thus, the coefficient of limiting friction is equal to the tangent of the angle of repose. CBSE | Physics Sample Paper 8 Solution 4. Mass, m = 75 kg; 5. No. The correct unit of torque is newton-metre, and not joule. This is done to create a difference between the scalar nature of work and the vector nature of torque. 6. The graph of h vs r is 7. 8. Wave motion 9. (i) M 3/2 L -1/2 T -2 (ii) M 1/2 L -3/2 T 0 CBSE | Physics Sample Paper 8 Solution 10. 11. 12. Work done is defined as the product of component of force along the direction of motion and displacement. 13. 2 / 0.05 2 / 50 1000 / 10 / ? ? ?? v k cm s m s ? ? ? CBSE | Physics Sample Paper 8 Solution 14. 15. (a) PV ? = constant, where ? = C P/C V (b) (i) 1 TV ?? = constant (ii) 1- PT ? ? = constant or 1- PT ?? = constant 16. An ideal or a perfect gas possesses the following two characteristics: (i) The size of the molecules of the gas is zero, i.e. each molecule is only a point mass with no dimensions. (ii) There is no force of attraction between the molecules. OR l T2 g ?? where l is effective length. Initially as the level of water drops, the effective length of the pendulum increases and this increases the time period. When the hollow sphere is completely empty, the effective length decreases due to rise in centre of gravity and the time period reduces to its original time period. Page 5 CBSE | Physics Sample Paper 8 Solution CBSE Board Class XI Physics Sample Paper-8 Solution 1. 2. While swimming, a person pushes the water backwards, and as a result he himself is pushed forward by the reaction force exerted by the water on him. 3. The angle of repose is defined as the angle of the inclined plane at which a body placed on it, just begins to slide. In the figure Thus, the coefficient of limiting friction is equal to the tangent of the angle of repose. CBSE | Physics Sample Paper 8 Solution 4. Mass, m = 75 kg; 5. No. The correct unit of torque is newton-metre, and not joule. This is done to create a difference between the scalar nature of work and the vector nature of torque. 6. The graph of h vs r is 7. 8. Wave motion 9. (i) M 3/2 L -1/2 T -2 (ii) M 1/2 L -3/2 T 0 CBSE | Physics Sample Paper 8 Solution 10. 11. 12. Work done is defined as the product of component of force along the direction of motion and displacement. 13. 2 / 0.05 2 / 50 1000 / 10 / ? ? ?? v k cm s m s ? ? ? CBSE | Physics Sample Paper 8 Solution 14. 15. (a) PV ? = constant, where ? = C P/C V (b) (i) 1 TV ?? = constant (ii) 1- PT ? ? = constant or 1- PT ?? = constant 16. An ideal or a perfect gas possesses the following two characteristics: (i) The size of the molecules of the gas is zero, i.e. each molecule is only a point mass with no dimensions. (ii) There is no force of attraction between the molecules. OR l T2 g ?? where l is effective length. Initially as the level of water drops, the effective length of the pendulum increases and this increases the time period. When the hollow sphere is completely empty, the effective length decreases due to rise in centre of gravity and the time period reduces to its original time period. 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