NSO Level 1- Science Olympiad (SOF) Class 8: Questions 734 - 737 of 1076

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Question number: 734

» Force and Pressure

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MCQ▾

Question

Force may change the direction of moving objects. Which of the following is an example of this statement?

Choices

Choice (4) Response

a.

Catching a cricket ball

b.

Kicking a football

c.

Hitting with hammer on an aluminium vessel

d.

Bouncing of a ball after hitting on a wall

Question number: 735

» Friction

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MCQ▾

Question

A mechanic puts grease on the moving parts of your bicycle while servicing in order to

Choices

Choice (4) Response

a.

Enable smooth running of the bicycle

b.

Reduce friction between the moving parts

c.

Increase friction between the moving parts

d.

Both a. and b. are correct

Question number: 736

» Force and Pressure

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MCQ▾

Question

A plastic straw rubbed with a synthetic cloth attracts a plastic straw but if both are rubbed with a synthetic cloth, they repel each other. The reason is

Choices

Choice (4) Response

a.

The straws attain same charge while rubbing with synthetic cloth

b.

The straw which is not rubbed with synthetic cloth has opposite charge

c.

The straws attain opposite charges while rubbing with synthetic cloth

d.

All of the above

Question number: 737

» Force and Pressure

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MCQ▾

Question

Akshay showed a magic to the class. He rubbed his plastic scale on his sweater and brought it near some bits of paper. The paper bits stuck to the plastic scale. When the students told their science teacher about this she explained them the reason. The reason would be

Choices

Choice (4) Response

a.

Electrostatic force is responsible for the attraction between the scale and paper bits.

b.

Electrostatic force is developed by rubbing plastic and wool

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

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