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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMark the correct statements for a particle going on a straight line:
(a) | if the velocity and acceleration have opposite sign, the object is slowing down. |
(b) | if the position and velocity have opposite sign, the particle is moving towards the origin. |
(c) | if the velocity is zero at an instant, the acceleration should also be zero at that instant. |
(d) | if the velocity is zero for a time interval, the acceleration is zero at any instant within the time interval. |
Choose the correct option:
1. | (a), (b) and (c) | 2. | (a), (b) and (d) |
3. | (b), (c) and (d) | 4. | all of these |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology