NEET Physics: Questions 940 - 943 of 2098

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Question number: 940

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 7 m rebounds only 1.6 f meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

2.45

b.

0.466

c.

1.26

d.

0.771

Question number: 941

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body of mass m is released from the top of a rough inclined plane as shown in figure. If the frictional force be F, then body will reach the bottom with a velocity

Inclined plane with body of mass m

Inclined Plane With Body of Mass M

A body of Mass on inclined plane – velocity to reach the bottom is calculated

Choices

Choice (4) Response

a.

2m(mghFL)

b.

2m(mgh+FL)

c.

1m(mghFL)

d.

None of the above

Question number: 942

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The mass of a rocket is 600 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 40 m/s 2 in the vertically upward direction (g = 10 m/s 2), will be –

Choices

Choice (4) Response

a.

120 kg/s

b.

10 kg/s

c.

60 kg/s

d.

72 kg/s

Question number: 943

» Laws of Motion » Laws of Friction

MCQ▾

Question

Consider the situation shown in figure. The wall is smooth but the surfaces of A and B in contact are rough in equilibrium the friction on B due to A -

Finding the friction on B due to A

Finding the Friction on B Due to A

The wall is smooth but the surfaces of A and B in contact are rough in equilibrium

Choices

Choice (4) Response

a.

The system cannot remain in equilibrium

b.

is downward

c.

is upward

d.

Is zero

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