Assertion (A): | A table cloth can be pulled from a table without dislodging the dishes. |
Reason (R): | To every action, there is an equal and opposite reaction. |
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): | \(1\) kg is making \(1\) rps in a circle of radius \(1\) m. The centrifugal force acting on it is \(4\pi^{2}\) N. | A body of mass
Reason (R): | \(F =\frac{m v^{2}}{r} .\) | Centrifugal force is given by
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 acceleration of a body down a rough inclined plane is greater than the acceleration due to gravity. |
Reason (R): | The body is able to slide on an inclined plane only when its acceleration is greater than the acceleration due to gravity. |
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): | It is easier to pull a heavy object than to push it on a levelled ground. |
Reason (R): | The magnitude of the frictional force depends on the nature of the two surfaces in contact. |
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 who falls from a height on a cement floor receives more injury than when he falls from the same height on a heap of sand. |
Reason (R): | The impulse applied by a cement floor is less than the impulse applied by a sand floor. |
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): | A rocket moves forward by pushing the surrounding air backward. |
Reason (R): | It derives the necessary thrust to move forward according to Newton's first law of 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. |
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): | A rocket works on the principle of conservation of linear momentum. |
Reason (R): | Higher is the velocity, smaller is the pressure and vice-versa. |
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. |