Assertion (A): | The apparent weight of the car is more when it crosses a concave bridge rather than a convex bridge with the same velocity. |
Reason (R): | The apparent weight of the car means the normal reaction and not the actual weight of the car. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Banking of roads provides the necessary centripetal force. |
Reason (R): | One part of the normal reaction of the automobile gives necessary centripetal force. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Assertion (A): | It is difficult to move a bicycle along a road with its brakes on. |
Reason (R): | When a bicycle moves with its brakes on, it skids and sliding friction is greater than rolling friction. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Assertion (A): | The principle of rocket propulsion is a special case of a variable mass system. |
Reason (R): | The principle of rocket propulsion can be explained by Newton's second law. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | A man in a closed cabin, which is falling freely, does not experience gravity. |
Reason (R): | Inertial and gravitational mass have equivalence. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | The use of ball bearings between two moving parts of a machine is a common practice. |
Reason (R): | Ball bearings reduce vibrations and provide good stability. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | The driver in a vehicle moving at a constant speed on a straight road is in a non-inertial frame of reference. |
Reason (R): | A reference frame in which Newton's law of motion is applicable is non-inertial. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | A cyclist leans inwards while taking a turn, while a man sitting in a car leans outward on a curve. |
Reason (R): | Centripetal acceleration is acting towards the centre of the curve. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Assertion (A): | On a rainy day, it is difficult to drive a car or a bus at a high speed. |
Reason (R): | The value of the coefficient of friction is lowered when the surface is wetted. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Assertion (A): | In a non-uniform circular motion, there are two types of accelerations i.e. centripetal and tangential. |
Reason (R): | Tangential acceleration is responsible to change the speed of the particle moving in a circular motion. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |