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Q. No.A bullet from a gun is fired on a rectangular wooden block with velocity \(u\). When bullet travels \(24\) cm through the block along its length horizontally, velocity of bullet becomes \(u/3\). Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is:
1.
\(30\) cm
2.
\(27\) cm
3.
\(24\) cm
4.
\(28\) cm
Subtopic: Work Energy Theorem |
70%
From NCERT
NEET - 2023
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A bullet of mass \(m\) hits a stationary block of mass \(M\) elastically. The transfer of energy is the maximum, when:
1. \(M=m\)
2. \(M=2m\)
3. \(M\ll m\)
4. \(M\gg m\)
1. \(M=m\)
2. \(M=2m\)
3. \(M\ll m\)
4. \(M\gg m\)
Subtopic: Collisions |
57%
From NCERT
NEET - 2023
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If a force \(F\) applied on an object moving along the \(\mathrm{y}\)-axis varies with the y-coordinate as \(F=3+2y^{2}. \) The work done in displacing the body from \(y=2\) m to \(y=5\) m is:
1. \(87\) J
2. \(0 \)
3. \(57\) J
4. \(72\) J
1. \(87\) J
2. \(0 \)
3. \(57\) J
4. \(72\) J
Subtopic: Work Done by Variable Force |
84%
From NCERT
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A particle with total energy \(E\) is moving in a potential energy region \(U(x).\) The motion of the particle is restricted to the region where:
1. \(U(x)<E\)
2. \(U(x)=0\)
3. \(U(x)\leq E\)
4. \(U(x)> E\)
1. \(U(x)<E\)
2. \(U(x)=0\)
3. \(U(x)\leq E\)
4. \(U(x)> E\)
Subtopic: Conservation of Mechanical Energy |
From NCERT
NEET - 2013
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A block of mass \(1\) kg can slide down a smooth curved track (see the figure given below). If the block is released from point \(A\), the velocity at point \(B\) will be:
(Take \(g=10~\text{m/s}^{2}\))
1. \(20\) ms–1
2. \(10\sqrt2\) ms–1
3. \(10\) ms–1
4. \(\sqrt10\) ms–1
(Take \(g=10~\text{m/s}^{2}\))
1. \(20\) ms–1
2. \(10\sqrt2\) ms–1
3. \(10\) ms–1
4. \(\sqrt10\) ms–1
Subtopic: Conservation of Mechanical Energy |
78%
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Under the action of a force, a mass of \(2~\text{kg}\) moves such that its position \(x \) at any time \(t\) is given by: \(x =t^{3}/3,\) where \(x \) is in meters and \(t\) is in seconds. The work done by the force in the first two seconds is:
| 1. | \(16~\text{J}\) | 2. | \(1.6~\text{J}\) |
| 3. | \(160~\text{J}\) | 4. | \(16~\text{kJ}\) |
Subtopic: Work Done by Variable Force |
76%
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A car moves on an inclined plane and covers \(10\) km path under the action of a horizontal force of \(5\) N. The work done on the car is \(25\) kJ. The inclination of the plane to horizontal is:
1. \(75^\circ\)
2. \(60^\circ\)
3. \(45^\circ\)
4. \(30^\circ\)
1. \(75^\circ\)
2. \(60^\circ\)
3. \(45^\circ\)
4. \(30^\circ\)
Subtopic: Work done by constant force |
81%
From NCERT
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Given below are two statements:
| Assertion (A): | When a firecracker (rocket) explodes in mid-air, its fragments fly in such a way that they continue moving in the same path, which the firecracker would have followed, had it not exploded. |
| Reason (R): | The explosion of cracker (rocket) occurs due to internal forces only and no external force acts for this explosion. |
| 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. |
Subtopic: Collisions |
From NCERT
NEET - 2022
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A gravitational field is present in a region, and a mass is shifted from \(A\) to \(B\) through different paths as shown. If \(W_1\), \(W_2\) and \(W_3\) represent the work done by the gravitational force along their respective paths, then:
| 1. | \(W_1=W_2=W_3\) | 2. | \(W_1>W_2>W_3\) |
| 3. | \(W_1>W_3>W_2\) | 4. | \(W_1<W_2<W_3\) |
Subtopic: Gravitational Potential Energy |
87%
From NCERT
NEET - 2022
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A constant force, \(\vec F=2\hat i-\hat j+5\hat k\) N acts on a body to move it along the \(x\)-axis. The work done by the force to move it by \(2\) m along the \(x \)-axis will be:
| 1. | \(12\) J | 2. | \(16\) J |
| 3. | \(0\) | 4. | \(4\) J |
Subtopic: Work done by constant force |
89%
From NCERT
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