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Q. No.Given the following statements:
a. The centre of gravity (C.G.) of a body is the point at which the weight of the body acts.
b. If the earth is assumed to have an infinitely large radius, the centre of mass coincides with the centre of gravity.
c. To evaluate the gravitational field intensity due to any body at an external point, the entire mass of the body can be considered to be concentrated at its C.G.
d. The radius of gyration of any body rotating about an axis is the length of the perpendicular dropped from the C.G. of the body to the axis.
Which one of the following pairs of statements is correct?
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (d) and (a)
a. The centre of gravity (C.G.) of a body is the point at which the weight of the body acts.
b. If the earth is assumed to have an infinitely large radius, the centre of mass coincides with the centre of gravity.
c. To evaluate the gravitational field intensity due to any body at an external point, the entire mass of the body can be considered to be concentrated at its C.G.
d. The radius of gyration of any body rotating about an axis is the length of the perpendicular dropped from the C.G. of the body to the axis.
Which one of the following pairs of statements is correct?
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (d) and (a)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider the following two statements:
(A): Linear momentum of the system remains constant.
(B): Centre of mass of the system remains at rest.
1. A implies B and B implies A
2. A does not imply B and B does not imply A
3. A implies B but B does not imply A
4. B implies A but A does not imply B
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider the following two statements :
(A): Linear momentum of a system of particles is zero.
(B): Kinetic energy of a system of particles is zero.
1. A implies B and B implies A
2. A does not imply B and B does not imply A
3. A implies B but B does not imply A
4. B implies A but A does not imply B
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyGiven below are two statements:
| Assertion (A): | If the sun were to 'suddenly' be removed, then the earth would continue to move around in its orbit. |
| Reason (R): | Angular momentum of a system of particles is conserved when there is no external torque. |
| 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion: Angular momentum of an isolated system of particles is conserved.
Reason: The net torque on an isolated system of particles is zero and the rate of change of angular momentum equals the torque.
1. Both assertion and reason are true, and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Assertion is false but the reason is true.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| a. | A body is in translational equilibrium if the net force on it is zero. |
| b. | A body is in rotational equilibrium if the net torque about any point is zero. |
| 1. | (a) only |
| 2. | (b) only |
| 3. | both (a) and (b) |
| 4. | neither (a) nor (b) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| Assertion (A): | The center of mass of an isolated system of particles remains at rest if it is initially at rest. |
| Reason (R): | Internal forces acting within a system cannot change the velocity of the center of mass which is proportional to the total momentum of the system. |
| 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). |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
Consider the following statements:
(P) Momentum of the system is conserved.
(Q) Kinetic energy of the system does not change after the collision.
(R) Angular momentum of the system is conserved.
1. P, Q, R are true.
2. P, R are true.
3. Only R is true.
4. Only P is true.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
(A) \(a_{cm}=\frac{F_1-F_2}{m+M},\) if there is no friction acting between \(m\) and \(M\)
(B) \(a_{cm}=\frac{F_1-F_2}{m+M},\) if there is static friction between \(m\) and \(M\)
(C) \(a_{cm}=\frac{F_1-F_2}{m+M},\) in all situations
1. only A is true.
2. only B is true.
3. C is true.
4. A, B are true but C is false.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyReason: For a system, \(\tau_{ext} = {dL \over dt} = 0\)
1. Both assertion and reason are correct and reason is the correct explanation of assertion
2. Both Assertion and Reason are correct but reason is not the correct explanation of assertion
3. Assertion is correct and the reason is incorrect
4. Assertion is incorrect and the reason is correct
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect Chapter Topics:
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