NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 944 - 947 of 2320

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Question number: 944

» 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: 945

» 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

Choices

Choice (4)Response

a.

Is zero

b.

is downward

c.

is upward

d.

The system cannot remain in equilibrium

Question number: 946

» Work, Energy and Power » Work Done

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Question

A body is acted upon by a force F =-i + 2j + 3k. The work done by the force in displacing it from (0,0, 0) to (0,0, 4m) will be

Choices

Choice (4)Response

a.

8 J

b.

12 J

c.

10 J

d.

6 J

Question number: 947

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 600 m/s. What velocity does rifle man acquire at the end of 10 shots.

Choices

Choice (4)Response

a.

0.3 m/s

b.

0.5 m/s

c.

0.6 m/s

d.

1.2 m/s

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