Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 44 - 50 of 285

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Question 44

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Question

MCQ▾

If a cylinder rolls down on an inclined plane, then it consists of:

Choices

Choice (4)Response

a.

only kinetic energy

b.

potential energy as well as kinetic energy

c.

only potential energy

d.

All of the above

Question 45

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Question

MCQ▾

If an electric motor creates a tension of in a hoisting cable and reels it in at the rate of , then the power of the electric motor is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question 46

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Question

MCQ▾

If the kinetic energy of a body is increased by , then the percentage increase in the linear momentum of the body is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question 47

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Question

MCQ▾

A bike is accelerated from to . The increase in kinetic energy is . Again, the bike is accelerated from to . The increase in kinetic energy is . The ratio of is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question 48

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Question

MCQ▾

At what height over earth’s pole, the acceleration due to gravity decreases by ?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 49

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Question

MCQ▾

Which of the following is scalar quantity?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 50

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Question

MCQ▾

The diameters of two planets are in the ratio , and their mean densities in the ratio . The acceleration due to gravity on the planets will be in ratio:

Choices

Choice (4)Response

a.

b.

c.

d.