Assertion (A): | A standing bus suddenly accelerates. If there was no friction between the feet of a passenger and the floor of the bus, the passenger would move back. |
Reason (R): | In the absence of friction, the floor of the bus would slip forward under the feet of the passenger. |
1. | (A) is True but (R) is False. |
2. | (A) is False but (R) is True. |
3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Assertion (A): | Newton's law of action and reaction is a consequence of Newton's law of inertia. |
Reason (R): | Newton's law of inertia implies that any body that is not acted upon by external forces cannot change its state of rest or uniform motion. |
1. | (A) is true but (R) is false. |
2. | (A) is false but (R) is true. |
3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
Statement I: | (Newton's 1st Law of Motion) Everybody continues in its state of rest or of uniform motion in a straight line except in so far as it be compelled by an externally impressed force to act otherwise. |
Statement II: | It is observed that when a car brakes suddenly, the passengers are thrown forward. |
1. | Statement I is True, Statement II is True, and Statement I is the correct explanation of Statement II. |
2. | Statement I is True, Statement II is True, and Statement I is not the correct explanation of Statement II. |
3. | Statement I is True, Statement II is False. |
4. | Statement I is False, Statement II is True. |
A block of mass \(M\) lies at rest on a horizontal table.
Statement I: | (Newton's 3rd Law) To every action, there is an equal and opposite reaction. Action and reaction forces act on different bodies and in opposite directions. |
Statement II: | The normal reaction is the reaction force, while the weight is the action. |
1. | Statement I is True, Statement II is True and Statement I is the correct reason for Statement II. |
2. | Statement I is True, Statement II is True and Statement I is not the correct reason for Statement II. |
3. | Statement I is True, Statement II is False. |
4. | Statement I is False, Statement II is True. |
Consider the following two statements
A: | The linear momentum of a particle is independent of the frame of reference. |
B: | The kinetic energy of a particle is independent of the frame of reference. |
1. | Both A and B are true |
2. | A is true but B is false |
3. | A is false but B is true |
4. | Both A and B are false |
A particle is on a smooth horizontal plane. A force \(F\) is applied, whose \((F\text-t)\) graph is given.
Consider the following statements.
(a) | At time \(t_1\), acceleration is constant. |
(b) | Initially the particle must be at rest. |
(c) | At time \(t_2\), acceleration is constant. |
(d) | The initial acceleration is zero. |
Select the correct statement(s):
1. | (a), (c) | 2. | (a), (b), (d) |
3. | (c), (d) | 4. | (b), (c) |
The figure shows the position-time graph of a body of mass 0.04 kg. What is the time between two consecutive impulses received by the body?
1. 2 s
2. 4 s
3. 1 s
4. 3 s
Figure shows the position-time graph of a body of mass 0.04 kg. What is the magnitude of each impulse recieved by the body?
1.
2.
3.
4.
Assertion (A): | A body must be at rest even when it is under the action of any number of external forces. |
Reason (R): | Vector sum of all external forces is zero. |
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. | (A) is false but (R) is true. |
Assertion (A): | Thrust on a rocket does not depend only on the rate of decrease of mass. |
Reason (R): | Thrust also depends upon the exhaust speed of the gases. |
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. | (A) is False but (R) is True. |