NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 898 - 902 of 2142

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Question number: 898

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The mass of a rocket is 500 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 20 m/s 2 in the vertically upward direction (g = 10 m/s 2), will be –

Choices

Choice (4) Response

a.

45 kg/s

b.

10 kg/s

c.

60 kg/s

d.

30 kg/s

Question number: 899

» Laws of Motion » Laws of Friction

MCQ▾

Question

Block A weighs 4 N and block B weighs 8 N. The coefficient of kinetic friction is 0.25 for all surfaces. find the force F to slide B at a constant speed when A is held at rest.

Choices

Choice (4) Response

a.

1N

b.

2N

c.

3N

d.

4N

Question number: 900

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

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 900 m/s. What velocity does rifle man acquire at the end of 10 shots.

Choices

Choice (4) Response

a.

0.3 m/s

b.

0.6 m/s

c.

0.9 m/s

d.

0.5 m/s

Question number: 901

» Work, Energy and Power » Work Done

MCQ▾

Question

A uniform chain is held on a frictionless table with one-fifth of its length hanging over the edge. If the chain has a length l and a mass m, how much work is required to pull the hanging part back on the table?

Choices

Choice (4) Response

a.

mg l /2

b.

mg l /10

c.

mg l/5

d.

mg l /50

Question number: 902

» Work, Energy and Power » Power

MCQ▾

Question

A bus of mass 1000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 1000 N. The maximum speed at which the bus can travel on level road and the acceleration when it is travelling at 25 m/s, will respectively be –

Choices

Choice (4) Response

a.

1.0 m/s, 50 m/s 2

b.

5.0 m/s, 10 m/s 2

c.

50 m/s, 1.0 m/s 2

d.

10 m/s, 5m/s 2

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