# A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20 J in 1 s. 1. The tension in the string is Mg 2. The tension in the string is F 3. The work done by the tension on the block is 20 J in the above 1 s 4. The work done by the force of gravity is –20 J in tie above 1 s

Subtopic:  Work Energy Theorem |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A bullet hits a block kept at rest on a smooth horizontal surface and gets embedded into it. Which of the following does not change?

 1 linear momentum of the block 2 kinetic energy of the block 3 gravitational potential energy of the block 4 temperature of the block
Subtopic:  Collisions |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A ball kept in a closed box moves in the box making collisions with the walls. The box is kept on a smooth surface. The velocity of the centre of mass:

 1 of the box remains constant. 2 of the box plus the ball system remains constant. 3 of the ball remains constant. 4 of the ball relative to the box remains constant.

Subtopic:  Collisions |
70%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A body at rest breaks into two pieces of equal masses. The parts will move:

 1 in the same direction. 2 along different lines. 3 in opposite directions with equal speeds. 4 in opposite directions with unequal speeds.

Subtopic:  Collisions |
83%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The quantities remaining constant in a collision are:

 1 momentum, kinetic energy and temperature 2 momentum and kinetic energy but not temperature 3 momentum and temperature but not kinetic energy 4 momentum, but neither kinetic energy nor temperature

Subtopic:  Collisions |
67%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In an elastic collision:

 1 the initial kinetic energy is equal to the final kinetic energy. 2 the final kinetic energy is less than the initial kinetic energy. 3 the kinetic energy remains constant. 4 the kinetic energy first increases then decreases.

Subtopic:  Collisions |
73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In an inelastic collision:

 1 the initial kinetic energy is equal to the final kinetic energy. 2 the final kinetic energy is less than the initial kinetic energy. 3 the kinetic energy remains constant. 4 the kinetic energy first increases and then decreases.

Subtopic:  Collisions |
79%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A block moving in air breaks into two parts and the parts separate;

(a) the total momentum must be conserved

(b) the total kinetic energy must be conserved

(c) the total momentum must change

(d) the total kinetic energy must change

Choose the correct options:

1. (a) and (b)

2. (a) and (c)

3. (a) and (d)

4. All of these

Subtopic:  Collisions |
58%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In an elastic collision:

 a. the kinetic energy remains constant. b. the linear momentum remains constant. c. the final kinetic energy is equal to the initial kinetic energy. d. the final linear momentum is equal to the initial linear momentum.

Choose the correct options:

 1 (a), (b) and (c) 2 (b), (c) and (d) 3 (a), (c) and (d) 4 none of these
Subtopic:  Collisions |
65%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A ball hits a floor and rebounds after an inelastic collision. In this case:

(a) the momentum of the ball just after the collision is same as that just before the collision

(b) the mechanical energy of the ball remains the same during the collision

(c) the total momentum of the ball and the earth is conserved

(d) the total energy of the ball and the earth remains the same

Choose the correct options:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. None of these

Subtopic:  Collisions |
55%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints