Work, Energy and Power [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 17 - 21 of 230

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Question 17

Question MCQ▾

In an elastic collision-

Choices

Choice (4)Response

a.

Momentum is conserved but kinetic energy is not conserved

b.

Momentum is not conserved but kinetic energy is conserved

c.

Neither momentum nor kinetic energy is conserved

d.

the momentum and kinetic energy are conserved

Edit

Question 18

Question MCQ▾

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.

117.6 J

b.

73.5 J

c.

147 J

d.

98 J

Edit

Question 19

Question MCQ▾

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.

0.217%

b.

0.0217%

c.

21.7%

d.

2.17%

Edit

Question 20

Question MCQ▾

A body of mass M splits into two parts αM and (1 - a) M by an internal explosion, which generates kinetic energy T After explosion if the two parts move in the same direction as before, their relative speed will be –

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 21

Question MCQ▾

A particle moving in a straight line is acted by a force, which works at a constant rate and changes its velocity from u to v in passing over a distance x. The time taken will be –

Choices

Choice (4)Response

a.

b.

c.

d.

Edit