NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 912 - 915 of 2320

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Question number: 912

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MCQ▾

Question

A bullet of mass 0.01 kg travelling at a speed of 300 m/s strikes a block of mass 2 kg, which is suspended by a string of length 5 m. The center of gravity of the block is found to rise a vertical distance of 0.1 m The speed of the bullet after it emerges from the block will be -

Choices

Choice (4)Response

a.

110 m/s

b.

1.4 m/s

c.

20 m/s

d.

220 m/s

Question number: 913

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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 and B are connected by a light cord passing over a smooth Pulley.

Choices

Choice (4)Response

a.

1N

b.

2N

c.

3N

d.

5N

Question number: 914

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MCQ▾

Question

It is easier to pull a body than to push, because -

Choices

Choice (4)Response

a.

the friction force is more in pushing than that in pulling

b.

the body does not move forward when pushed

c.

the coefficient of friction is more in pushing than that in pulling

d.

Question does not provide sufficient data or is vague

Question number: 915

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MCQ▾

Question

A bullet of mass 20 g hits a block of mass 1.98 kg suspended from a massless string of length 100 cm and sticks to it. The bullet flies down at an angle of 30° to the horizontal with a velocity of 200 m/s. Through what height the block will rise-

Choices

Choice (4)Response

a.

0.45 m

b.

0.30 m

c.

0.75 m

d.

0.15 m

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