NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 943 - 947 of 2142

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Question number: 943

» 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: 944

» 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

Question number: 945

» Work, Energy and Power » Work Done

MCQ▾

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.

10 J

b.

12 J

c.

6 J

d.

8 J

Question number: 946

» Kinematics » Average Speed and Instantaneous Velocity

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.

0.6 m/s

b.

0.3 m/s

c.

0.5 m/s

d.

1.2 m/s

Question number: 947

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball moving with a speed of 9 m/s strikes with an identical stationary ball such that after the collision the direction of each ball makes an angle of 30° with the original line of motion. Find the speeds of the two balls after the collision. Is the kinetic energy conserved in this collision process?

Choices

Choice (4) Response

a.

6 √3 m/s, yes

b.

0, yes

c.

6 √3 m/s, no

d.

3 √3 m/s, no

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