Assertion (A): | In the presence of air friction, if the ball is thrown vertically upwards, the time of ascent is less than the time of descent. |
Reason (R): | Force due to air friction always acts opposite to the motion of the body. |
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): | If the average velocity of a particle is zero in a time interval, it is possible that the instantaneous velocity is never zero in the interval. |
Reason (R): | If the average velocity of a particle moving on a straight line is zero in a time interval then at least for one moment the instantaneous velocity will also be zero in the interval. |
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): | Parabolic curve of velocity versus time implies that its acceleration varies linearly with time. |
Reason (R): | Parabolic curve represent quadratic function and acceleration is the first derivative of velocity so the acceleration versus time graph will be linear. |
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 body can have a velocity varying in both magnitude and direction but still have constant acceleration. |
Reason (R): | Acceleration is defined as the rate of change of speed with respect to time. |
1. | Both assertion & reason are true and the reason is the correct explanation of the assertion |
2. | Both assertion & reason are true but the reason is not the correct explanation of the assertion |
3. | Assertion is true but reason is false. |
4. | Both assertion and reason are false statements. |
Assertion (A): | A body can have acceleration even if its velocity is zero at a given instant of time. |
Reason (R): | A body is momentarily at rest when it reverses its direction 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): | Displacement of a body may be zero, when distance travelled by it is not zero. |
Reason (R): | The displacement is the longest distance between initial and final position. |
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 particle having zero acceleration must have a constant speed. |
Reason (R): | A particle having constant speed must have zero acceleration. |
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): | Two balls of different masses are thrown vertically upward with the same speed. They will pass through their point of projection in the downward direction with the same speed. |
Reason (R): | The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball. |
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): | Adding a scalar to a vector of the same dimension is a meaningful algebraic operation. |
Reason (R): | Displacement can be added to distance. |
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 average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval. |
Reason (R): | Displacement is the shortest distance. |
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. |