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Q. No.A ball of mass \(0.5~\text{kg}\) is dropped from a height of \(40~\text{m}.\) The ball hits the ground and rises to a height of \(10~\text{m}.\) The impulse imparted to the ball during its collision with the ground is:
(take \(g=9.8~\text{m/s}^2\))
1. \(0\)
2. \(84~\text{N-s}\)
3. \(21~\text{N-s}\)
4. \(7~\text{N-s}\)
(take \(g=9.8~\text{m/s}^2\))
1. \(0\)
2. \(84~\text{N-s}\)
3. \(21~\text{N-s}\)
4. \(7~\text{N-s}\)
Subtopic: Newton's Laws |
From NCERT
NEET - 2025
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There are two inclined surfaces of equal length \((L)\) and same angle of inclination \(45^\circ\) with the horizontal. One of them is rough and the other is perfectly smooth. A given body takes \(2\) times as much time to slide down on rough surface than on the smooth surface. The coefficient of kinetic friction \((\mu_k)\) between the object and the rough surface is close to:
1. \(0.5\)
2. \(0.75\)
3. \(0.25\)
4. \(0.40\)
1. \(0.5\)
2. \(0.75\)
3. \(0.25\)
4. \(0.40\)
Subtopic: Friction |
From NCERT
NEET - 2025
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A bob is whirled in a horizontal plane by means of a string with an initial speed of \(\omega\) rpm. The tension in the string is \(T\). If speed becomes \(2\omega\) while keeping the same radius, the tension in the string becomes:
| 1. | \(4 T\) | 2. | \(\dfrac{T}{4}\) |
| 3. | \(\sqrt{2} T\) | 4. | \(T\) |
Subtopic: Uniform Circular Motion |
65%
From NCERT
NEET - 2024
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A horizontal force \(10~\text N\) is applied to a block \(A\) as shown in figure. The mass of blocks \(A\) and \(B\) are \(2~\text{kg}\) and \(3~\text{kg}\), respectively. The blocks slide over a frictionless surface. The force exerted by block \(A\) on block \(B\) is :
1. \(4~\text N\)
2. \(6~\text N\)
3. \(10~\text N\)
4. zero
1. \(4~\text N\)
2. \(6~\text N\)
3. \(10~\text N\)
4. zero
Subtopic: Application of Laws |
69%
From NCERT
NEET - 2024
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If \(F=\alpha t^2-\beta t \) is the magnitude of the force acting on a particle at an instant \(t\) then the time, at which the force becomes constant, is (where \(\alpha \) and \(\beta \) are constants):
1. \(\dfrac{\beta}{\alpha}\)
2. \(\dfrac{\beta}{2\alpha}\)
3. \(\dfrac{2\beta}{\alpha}\)
4. zero
1. \(\dfrac{\beta}{\alpha}\)
2. \(\dfrac{\beta}{2\alpha}\)
3. \(\dfrac{2\beta}{\alpha}\)
4. zero
Subtopic: Types of Forces |
69%
From NCERT
NEET - 2024
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A bob is whirled in a horizontal circle by means of a string at an initial speed of \(10\) rpm. If the tension in the string is quadrupled while keeping the radius constant, the new speed is:
| 1. | \(20\) rpm | 2. | \(40\) rpm |
| 3. | \(5\) rpm | 4. | \(10\) rpm |
Subtopic: Uniform Circular Motion |
67%
From NCERT
NEET - 2024
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A box of mass \(5 ~\text{kg}\) is pulled by a cord, up along a frictionless plane inclined at \(30^\circ\) with the horizontal. The tension in the cord is \(30~\text N.\) The acceleration of the box is: (take \(g=10~\text{ms}^{-2}\))
1. \(2~\text{ms}^{-2}\)
2. zero
3. \(0.1~\text{ms}^{-2}\)
4. \(1~\text{ms}^{-2}\)
1. \(2~\text{ms}^{-2}\)
2. zero
3. \(0.1~\text{ms}^{-2}\)
4. \(1~\text{ms}^{-2}\)
Subtopic: Tension & Normal Reaction |
72%
From NCERT
NEET - 2024
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A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is:
1. along south-west
2. along eastward
3. along northward
4. along north-east
1. along south-west
2. along eastward
3. along northward
4. along north-east
Subtopic: Newton's Laws |
55%
From NCERT
NEET - 2023
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Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is \(0.15\). (take \(g=10\) ms–2)
| 1. | \(50\) ms–2 | 2. | \(1.2\) ms–2 |
| 3. | \(150\) ms–2 | 4. | \(1.5\) ms–2 |
Subtopic: Friction |
82%
From NCERT
NEET - 2023
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A block of mass \(2\) kg is placed on inclined rough surface \(AC\) (as shown in the figure) of coefficient of friction \(\mu.\) If \(g=10\) ms–1, the net force (in N) on the block will be:
1. \(10\sqrt3\)
2. zero
3. \(10\)
4. \(20\)
1. \(10\sqrt3\)
2. zero
3. \(10\)
4. \(20\)
Subtopic: Friction |
66%
From NCERT
NEET - 2023
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