NSO Level 1- Science Olympiad (SOF) Class 8: Questions 747 - 750 of 1076

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Question number: 747

» Friction

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MCQ▾

Question

In a school building there are four ways with equal length to reach the main gate. First is the main path paved with polished lock tiles, second is a concrete path, third is paved with sand, and the fourth one is paved with gravel which is used for four wheelers. Rahul has a sprain on his right leg and doctor advised him not to give much strain to that leg. Which of the paths should he select?

Choices

Choice (4) Response

a.

First

b.

Third

c.

Fourth

d.

Second

Question number: 748

» Friction

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MCQ▾

Question

The lower part of the soul of footwear is not smooth and plane. They are grooved to make the surface rough

Choices

Choice (4) Response

a.

Rough surface gives enough grip while moving

b.

This helps to increase the friction

c.

Both a. and b. are correct

d.

None of the above

Question number: 749

» Force and Pressure

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MCQ▾

Question

We are able to drink juice from a narrow necked bottle with the help of a straw. This is because of

Choices

Choice (4) Response

a.

Air pressure

b.

Water pressure

c.

Muscular force

d.

All of the above

Question number: 750

» Friction

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MCQ▾

Question

When a worker uses a rolling grindstone to sharpen the knife, sparks are produced. This is because

Choices

Choice (4) Response

a.

Light energy is produced due to friction

b.

Heat energy produced due to friction changes to light energy

c.

The edge of the knife starts burning by heat

d.

None of the above

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