# Work, Energy and Power (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 17 - 21 of 63

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## Question number: 17

» Work, Energy and Power » Work Done

MCQ▾

### Question

A chain of linear density 3 kg/m and length 8 m is lying on the table with 4 m of chain hanging from the edge. The work done in lifting the chain on the table will be –

### Choices

Choice (4) Response

a.

235.2 J

b.

117.6 J

c.

98 J

d.

196 J

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## Question number: 18

» Work, Energy and Power » Elastic and Inelastic Collisions

MCQ▾

### Question

In an elastic collision-

### Choices

Choice (4) Response

a.

Momentum is not conserved but kinetic energy is conserved

b.

Momentum is conserved but kinetic energy is not conserved

c.

Neither momentum nor kinetic energy is conserved

d.

the momentum and kinetic energy are conserved

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## Question number: 19

» Work, Energy and Power » Work Done

MCQ▾

### Question

The work done in lifting water from a well of depth 6 m using a bucket of mass 0.5 kg and volume 2 liter, will be

### Choices

Choice (4) Response

a.

98 J

b.

117.6 J

c.

73.5 J

d.

147 J

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## Question number: 20

» Work, Energy and Power » Kinetic Energy

MCQ▾

### Question

A slow moving electron collides elastically with a hydrogen atom at rest. The initial and final motions are along the same straight line. What fraction of electron’s kinetic energy is transferred to the hydrogen atom? The mass of hydrogen atom is 1850 times the mass of electron.

### Choices

Choice (4) Response

a.

2.17 %

b.

21.7%

c.

0.217%

d.

0.0217 %

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## Question number: 21

» Work, Energy and Power » Elastic and Inelastic Collisions

Assertion-Reason▾

### Assertion (Ꭺ)

A particle of mass m strikes a wedge of mass M horizontally as shown in the figure. If collision is perfectly inelastic then, it can be concluded that the particle sticks to the wedge.

### Reason (Ꭱ)

In perfectly inelastic collision velocity of both bodies is same along common normal just after collision.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

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