Assertion (A): | A safe turn by a cyclist should neither be fast nor sharp. |
Reason (R): | The bending angle from the vertical would decrease with an increase in velocity. |
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): | When a cyclist doubles his speed of turning, the chance of his skidding becomes nearly four times. |
Reason (R): | When the speed of the vehicle increases, the angle of bending also increases. |
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): | Improper banking of roads causes wear and tear of tyres. |
Reason (R): | The necessary centripetal force in that event is provided by the force of friction between the tyres and the road. |
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 banked curved track, the vertical component of normal reaction provides the necessary centripetal force. |
Reason (R): | Centripetal force is not always required for turning. |
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): | 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): | 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. |