NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 941 - 944 of 2184

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Question number: 941

» Work, Energy and Power » Potential Energy

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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.

0.771

b.

0.466

c.

2.45

d.

1.26

Question number: 942

» Laws of Motion » Laws of Friction

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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.

b.

c.

d.

Question does not provide sufficient data or is vague

Question number: 943

» Kinematics » Average Speed and Instantaneous Velocity

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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.

72 kg/s

b.

10 kg/s

c.

60 kg/s

d.

120 kg/s

Question number: 944

» Laws of Motion » Laws of Friction

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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.

Is zero

b.

is downward

c.

is upward

d.

The system cannot remain in equilibrium