Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 245 - 250 of 285

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Question number: 245

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Question

MCQ▾

If identical particles of masses and are moving with velocities and , respectively; then the ratio of their kinetic energy is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 246

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Question

MCQ▾

If two bodies are in contact, then the direction of force of friction between these two bodies is:

Choices

Choice (4)Response

a.

Parallel to the contact surface

b.

Inclined at to the contact surface

c.

Normal to the contact surface

d.

Inclined at to the contact surface

Question number: 247

Physics
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Question

MCQ▾

A stone is thrown vertically upwards with a velocity of . What is the total time for which the stone will remain in the air?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 248

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Question

MCQ▾

For maximum work, angle between force and displacement should be:

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Choice (4)Response

a.

b.

c.

d.

Question number: 249

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Question

MCQ▾

One person does some work in time and another person does same amount of work in time. If the time is greater than time , and power of first person is and power of second person is ; then:

Choices

Choice (4)Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

Question number: 250

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Question

MCQ▾

Consider a body of weight on the surface of earth, and its weight on the moon is . If its mass on the earth is , then its mass on the moon is:

Choices

Choice (4)Response

a.

b.

c.

d.