# Work, Energy and Power (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 46 - 51 of 63

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## Question number: 46

» Work, Energy and Power » Elastic and Inelastic Collisions

MCQ▾

### Question

Inelastic collision is the-

### Choices

Choice (4) Response

a.

Collision of ideal gas molecules with the walls of the container

b.

collision of electron and positron to an annihilate each other.

c.

collision of two rigid solid spheres lying on a frictionless table

d.

scattering of a-particles with the nucleus of gold atom

## Passage

In the figure shown, the system is released from rest with both the springs in unscratched positions. Mass of each block is 1 kg and force constant of each spring is 10 N/m.

## Question number: 47 (1 of 3 Based on Passage) Show Passage

» Work, Energy and Power » Work Done

MCQ▾

### Question

Maximum speed of the block placed horizontally is:

### Choices

Choice (4) Response

a.

1.26 m/s

b.

3.21 m/s

c.

2.21 m/s

d.

1.93 m/s

## Question number: 48 (2 of 3 Based on Passage) Show Passage

» Work, Energy and Power » Work Done

MCQ▾

### Question

Extension of horizontal spring in equilibrium is:

### Choices

Choice (4) Response

a.

0.6 m

b.

0.8 m

c.

0.2 m

d.

0.4 m

## Question number: 49 (3 of 3 Based on Passage) Show Passage

» Work, Energy and Power » Work Done

MCQ▾

### Question

Extension of vertical spring in equilibrium is

### Choices

Choice (4) Response

a.

0.8 m

b.

0.2 m

c.

0.6 m

d.

0.4 m

## Question number: 50

» Work, Energy and Power » Elastic and Inelastic Collisions

MCQ▾

### Question

In an inelastic collision-

### Choices

Choice (4) Response

a.

the momentum and kinetic energy are conserved

b.

neither momentum nor kinetic energy is conserved

c.

momentum is not conserved but kinetic energy is conserved

d.

Momentum is conserved but kinetic energy is not conserved

## Question number: 51

» Work, Energy and Power » Elastic and Inelastic Collisions

Assertion-Reason▾

### Assertion (Ꭺ)

In an elastic collision in one dimension between two bodies, total momentum remains the same before, during and after the collision.

### Reason (Ꭱ)

In an elastic collision in one dimension between two bodies, total kinetic energy remains the same before, during and after the collision. [Assume external forces are absent in both the above statements],

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

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