Page 1 CBSE | Physics Sample Paper 9 Solution CBSE Board Class XI Physics Sample Paper-9 Solution 1. Dimension of a = dim of F × dimension of x As dimension of LHS = dimension of RHS (each term) a = [ML 2 T -2 ] 2. No, it is not possible. In order to change the state of motion of a body, some net external force must act on the body. 3. Impulse and change in momentum are along the same direction. Therefore, angle between these two vectors is zero degree. 4. Work is done by the winning team. It is equal to the product of the resultant force applied by the two teams and the displacement that the losing team suffers. 5. It depends upon the shape and size of the body and the distribution of its mass. 6. Since in case of a parachute fall, appreciable work is done against the non-conservative force of friction, Bernoulli's equation as such cannot be applied. 7. K is infinity for perfect heat conductor and K is Zero for perfect heat insulator. 8. Page 2 CBSE | Physics Sample Paper 9 Solution CBSE Board Class XI Physics Sample Paper-9 Solution 1. Dimension of a = dim of F × dimension of x As dimension of LHS = dimension of RHS (each term) a = [ML 2 T -2 ] 2. No, it is not possible. In order to change the state of motion of a body, some net external force must act on the body. 3. Impulse and change in momentum are along the same direction. Therefore, angle between these two vectors is zero degree. 4. Work is done by the winning team. It is equal to the product of the resultant force applied by the two teams and the displacement that the losing team suffers. 5. It depends upon the shape and size of the body and the distribution of its mass. 6. Since in case of a parachute fall, appreciable work is done against the non-conservative force of friction, Bernoulli's equation as such cannot be applied. 7. K is infinity for perfect heat conductor and K is Zero for perfect heat insulator. 8. CBSE | Physics Sample Paper 9 Solution 9. 10. Speed of a moving body is defined as the rate of change of position of the body with respect to time. It is measured by the distance travelled by the body in a unit time. Velocity of a moving body is defined as the rate of change of position of the body along a particular direction with respect to time. OR Damped oscillations are oscillations in which dissipative forces act as additional restoring forces to continuously decrease the amplitude of oscillation. Forced oscillations are oscillations whose amplitude is maintained by an external periodic force which compensates for the energy loss in damped oscillations. Resonant oscillations are those forced oscillations in which the frequency of driver force matches with the natural frequency of the system resulting in large increase in amplitude. 11. No, the bomb will not hit the target. At the time the bomb is released, it has horizontal velocity same as that of the bomber. Due to this velocity (say u) it will fall a distance u 2h g ? ahead of the target, where h is the height of the bomber when the bomb is dropped. Page 3 CBSE | Physics Sample Paper 9 Solution CBSE Board Class XI Physics Sample Paper-9 Solution 1. Dimension of a = dim of F × dimension of x As dimension of LHS = dimension of RHS (each term) a = [ML 2 T -2 ] 2. No, it is not possible. In order to change the state of motion of a body, some net external force must act on the body. 3. Impulse and change in momentum are along the same direction. Therefore, angle between these two vectors is zero degree. 4. Work is done by the winning team. It is equal to the product of the resultant force applied by the two teams and the displacement that the losing team suffers. 5. It depends upon the shape and size of the body and the distribution of its mass. 6. Since in case of a parachute fall, appreciable work is done against the non-conservative force of friction, Bernoulli's equation as such cannot be applied. 7. K is infinity for perfect heat conductor and K is Zero for perfect heat insulator. 8. CBSE | Physics Sample Paper 9 Solution 9. 10. Speed of a moving body is defined as the rate of change of position of the body with respect to time. It is measured by the distance travelled by the body in a unit time. Velocity of a moving body is defined as the rate of change of position of the body along a particular direction with respect to time. OR Damped oscillations are oscillations in which dissipative forces act as additional restoring forces to continuously decrease the amplitude of oscillation. Forced oscillations are oscillations whose amplitude is maintained by an external periodic force which compensates for the energy loss in damped oscillations. Resonant oscillations are those forced oscillations in which the frequency of driver force matches with the natural frequency of the system resulting in large increase in amplitude. 11. No, the bomb will not hit the target. At the time the bomb is released, it has horizontal velocity same as that of the bomber. Due to this velocity (say u) it will fall a distance u 2h g ? ahead of the target, where h is the height of the bomber when the bomb is dropped. CBSE | Physics Sample Paper 9 Solution 12. 13. 14. Page 4 CBSE | Physics Sample Paper 9 Solution CBSE Board Class XI Physics Sample Paper-9 Solution 1. Dimension of a = dim of F × dimension of x As dimension of LHS = dimension of RHS (each term) a = [ML 2 T -2 ] 2. No, it is not possible. In order to change the state of motion of a body, some net external force must act on the body. 3. Impulse and change in momentum are along the same direction. Therefore, angle between these two vectors is zero degree. 4. Work is done by the winning team. It is equal to the product of the resultant force applied by the two teams and the displacement that the losing team suffers. 5. It depends upon the shape and size of the body and the distribution of its mass. 6. Since in case of a parachute fall, appreciable work is done against the non-conservative force of friction, Bernoulli's equation as such cannot be applied. 7. K is infinity for perfect heat conductor and K is Zero for perfect heat insulator. 8. CBSE | Physics Sample Paper 9 Solution 9. 10. Speed of a moving body is defined as the rate of change of position of the body with respect to time. It is measured by the distance travelled by the body in a unit time. Velocity of a moving body is defined as the rate of change of position of the body along a particular direction with respect to time. OR Damped oscillations are oscillations in which dissipative forces act as additional restoring forces to continuously decrease the amplitude of oscillation. Forced oscillations are oscillations whose amplitude is maintained by an external periodic force which compensates for the energy loss in damped oscillations. Resonant oscillations are those forced oscillations in which the frequency of driver force matches with the natural frequency of the system resulting in large increase in amplitude. 11. No, the bomb will not hit the target. At the time the bomb is released, it has horizontal velocity same as that of the bomber. Due to this velocity (say u) it will fall a distance u 2h g ? ahead of the target, where h is the height of the bomber when the bomb is dropped. CBSE | Physics Sample Paper 9 Solution 12. 13. 14. CBSE | Physics Sample Paper 9 Solution 15. Consider the above figure. The thermal efficiency of a heat engine is gives as: 16. (a) Volume of 1 mole of a gas. (b) Volume of 2 moles of gas. 17. (a) It is meaningful, if both the scalars represent the same physical quantities. (b) It is not permissible as the vector can only be added to another vector. (c) It is permissible, e.g. mass multiplied with velocity. (d) it is permissible, e.g. volume multiplied by density equals mass. (e) It is permissible, if both the vectors represent the same physical quantity, otherwise not. For example we can add the forces, but not force and velocity. (f) It is permissible. Page 5 CBSE | Physics Sample Paper 9 Solution CBSE Board Class XI Physics Sample Paper-9 Solution 1. Dimension of a = dim of F × dimension of x As dimension of LHS = dimension of RHS (each term) a = [ML 2 T -2 ] 2. No, it is not possible. In order to change the state of motion of a body, some net external force must act on the body. 3. Impulse and change in momentum are along the same direction. Therefore, angle between these two vectors is zero degree. 4. Work is done by the winning team. It is equal to the product of the resultant force applied by the two teams and the displacement that the losing team suffers. 5. It depends upon the shape and size of the body and the distribution of its mass. 6. Since in case of a parachute fall, appreciable work is done against the non-conservative force of friction, Bernoulli's equation as such cannot be applied. 7. K is infinity for perfect heat conductor and K is Zero for perfect heat insulator. 8. CBSE | Physics Sample Paper 9 Solution 9. 10. Speed of a moving body is defined as the rate of change of position of the body with respect to time. It is measured by the distance travelled by the body in a unit time. Velocity of a moving body is defined as the rate of change of position of the body along a particular direction with respect to time. OR Damped oscillations are oscillations in which dissipative forces act as additional restoring forces to continuously decrease the amplitude of oscillation. Forced oscillations are oscillations whose amplitude is maintained by an external periodic force which compensates for the energy loss in damped oscillations. Resonant oscillations are those forced oscillations in which the frequency of driver force matches with the natural frequency of the system resulting in large increase in amplitude. 11. No, the bomb will not hit the target. At the time the bomb is released, it has horizontal velocity same as that of the bomber. Due to this velocity (say u) it will fall a distance u 2h g ? ahead of the target, where h is the height of the bomber when the bomb is dropped. CBSE | Physics Sample Paper 9 Solution 12. 13. 14. CBSE | Physics Sample Paper 9 Solution 15. Consider the above figure. The thermal efficiency of a heat engine is gives as: 16. (a) Volume of 1 mole of a gas. (b) Volume of 2 moles of gas. 17. (a) It is meaningful, if both the scalars represent the same physical quantities. (b) It is not permissible as the vector can only be added to another vector. (c) It is permissible, e.g. mass multiplied with velocity. (d) it is permissible, e.g. volume multiplied by density equals mass. (e) It is permissible, if both the vectors represent the same physical quantity, otherwise not. For example we can add the forces, but not force and velocity. (f) It is permissible. CBSE | Physics Sample Paper 9 Solution 18. The pulley system with mass m 1 and m 2 is shown in the figure above. The tension T is same throughout.Read More

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