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Q. No.The potential energy of a long spring when stretched by \(2\) cm is \(U\). If the spring is stretched by \(8\) cm, potential energy stored in it will be:
| 1. | \(16U\) | 2. | \(2U\) |
| 3. | \(4U\) | 4. | \(8U\) |
Subtopic: Elastic Potential Energy |
72%
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NEET - 2023
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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
1. \(30\) cm
2. \(27\) cm
3. \(24\) cm
4. \(28\) cm
Subtopic: Work Energy Theorem |
65%
From NCERT
NEET - 2023
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A bullet of mass \(m\) hits a block of mass \(M\) elastically. The transfer of energy is the maximum, when:
1. \(M=m\)
2. \(M=2m\)
3. \(M<<m\)
4. \(M>>m\)
1. \(M=m\)
2. \(M=2m\)
3. \(M<<m\)
4. \(M>>m\)
Subtopic: Collisions |
54%
From NCERT
NEET - 2023
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A particle moves with a velocity \((5\hat i-3\hat j+6\hat k)\) ms-1 horizontally under the action of constant force \((10\hat i+10\hat j+20\hat k)\) N. The instantaneous power supplied to the particle is:
1. \(200\) W
2. zero
3. \(100\) W
4. \(140\) W
1. \(200\) W
2. zero
3. \(100\) W
4. \(140\) W
Subtopic: Power |
77%
From NCERT
NEET - 2023
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The energy that will be ideally radiated by a \(100\) kW transmitter in \(1\) hour is:
| 1. | \(1\times 10^{5}\) J | 2. | \(36\times 10^{7}\) J |
| 3. | \(36\times 10^{4}\) J | 4. | \(36\times 10^{5}\) J |
Subtopic: Power |
72%
From NCERT
NEET - 2022
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An electric lift with a maximum load of \(2000\) kg (lift+passengers) is moving up with a constant speed of \(1.5\) ms-1. The frictional force opposing the motion is \(3000\) N. The minimum power delivered by the motor to the lift in watts is: (Take \(g=10\) ms-2)
| 1. | \(23500\) | 2. | \(23000\) |
| 3. | \(20000\) | 4. | \(34500\) |
Subtopic: Power |
61%
From NCERT
NEET - 2022
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A particle of mass \(4M\) kg at rest splits into two particles of mass \(M\) and \(3M.\) The ratio of the kinetic energies of mass \(M\) and \(3M\) would be:
| 1. | \(3:1\) | 2. | \(1:4\) |
| 3. | \(1:1\) | 4. | \(1:3\) |
Subtopic: Collisions |
62%
From NCERT
NEET - 2022
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A block of mass \(m\) is moving with initial velocity \(u\) towards a stationary spring of stiffness constant \(k\) attached to the wall as shown in the figure. Maximum compression of the spring is:
(The friction between the block and the surface is negligible).
| 1. | \(u\sqrt{\frac{m}{k}}\) | 2. | \(4u\sqrt{\frac{m}{k}}\) |
| 3. | \(2u\sqrt{\frac{m}{k}}\) | 4. | \(\frac12u\sqrt{\frac{k}{m}}\) |
Subtopic: Elastic Potential Energy |
78%
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 \(\mathrm{W_1}\), \(\mathrm{W_2}\) and \(\mathrm{W_3}\) represent the work done by the gravitational force along their respective paths, then:
| 1. | \(\mathrm{W}_1=\mathrm{W}_2=\mathrm{W}_3\) | 2. | \(\mathrm{W}_1>\mathrm{W}_2>\mathrm{W}_3\) |
| 3. | \(\mathrm{W}_1>\mathrm{W}_3>\mathrm{W}_2\) | 4. | \(\mathrm{W}_1<\mathrm{W}_2<\mathrm{W}_3\) |
Subtopic: Gravitational Potential Energy |
84%
From NCERT
NEET - 2022
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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): | 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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