NEET Physics: Questions 835 - 840 of 2142

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Question number: 835

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

Question number: 836

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

Question number: 837

MCQ▾

Question

An automobile of mass m accelerates from rest If the engine supplies a constant power P, the velocity at time t is given by –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 838

MCQ▾

Question

A particle of mass m is moving in a horizontal circle of radius r, under a centripetal force equal to (-k/r 2), where k is a constant. The total energy of the particle is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 839

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

Question number: 840

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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