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. $$\large\frac{T}{4}$$
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
Subtopic:  Application of Laws |
65%
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 $$\large\frac{\beta}{\alpha}$$ 2 $$\large\frac{\beta}{2\alpha}$$ 3 $$\large\frac{2\beta}{\alpha}$$ 4 zero
Subtopic:  Types of Forces |
70%
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
Subtopic:  Newton's Laws |
52%
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 |
78%
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 $$20$$
Subtopic:  Friction |
63%
From NCERT
NEET - 2023
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A $$1$$ kg object strikes a wall with velocity $$1$$ ms–1 at an angle of $$60^\circ$$ with the wall and reflects at the same angle. If it remains in contact with the wall for $$0.1$$ s, then the force exerted on the wall is:
1. $$30\sqrt3~\text N$$
2. zero
3. $$10\sqrt3~\text N$$
4. $$20\sqrt3~\text N$$
Subtopic:  Newton's Laws |
80%
From NCERT
NEET - 2023
Hints

Given below are two statements:
 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).
Subtopic:  Newton's Laws |
62%
From NCERT
NEET - 2022
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When a body of mass $$m$$ just begins to slide as shown, match List-I with List-II:

 List-I List-II (a) Normal reaction (i) $$P$$ (b) Frictional force $$(f_s)$$ (ii) $$Q$$ (c) Weight $$(mg)$$ (iii) $$R$$ (d) $$mg \mathrm{sin}\theta ~$$ (iv) $$S$$

Choose the correct answer from the options given below:
 (a) (b) (c) (d) 1. (ii) (i) (iii) (iv) 2. (iv) (ii) (iii) (i) 3. (iv) (iii) (ii) (i) 4. (ii) (iii) (iv) (i)
Subtopic:  Application of Laws |
85%
From NCERT
NEET - 2022
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In the diagram shown, the normal reaction force between $$2$$ kg and $$1$$ kg blocks is:
(Consider the surface to be smooth and $$g=10$$ ms–2 )

1. $$25$$ N
2. $$39$$ N
3. $$6$$ N
4. $$10$$ N
Subtopic:  Tension & Normal Reaction |
50%
From NCERT
NEET - 2022
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