NSO Level 1- Science Olympiad (SOF) Class 8: Questions 782 - 786 of 1076

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Question number: 782

» Friction

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MCQ▾

Question

Friction of a surface depends upon

Choices

Choice (4) Response

a.

Roughness of the surface

b.

Smoothness of the surface

c.

Inclination of the surface

d.

All a. , b. and c. are correct

Question number: 783

» Force and Pressure

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MCQ▾

Question

Figure shown the magnet and its pols

Figure Shown the Magnet and Its Pols

The magnet and its pols is shown in figure

Two magnets are arranged as shown in figure. The effect of force here is

Choices

Choice (4) Response

a.

Attraction

b.

Repulsion

c.

Charging

d.

Question does not provide sufficient data or is vague

Question number: 784

» Force and Pressure

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MCQ▾

Question

Here are some statements about frictional force. Pick out the correct ones.

Choices

Choice (4) Response

a.

It always acts opposite to the direction of motion

b.

It always depends on the nature of the surfaces in contact

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

Question number: 785

» Friction

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MCQ▾

Question

When an object rolls over a surface, the friction created is called

Choices

Choice (4) Response

a.

Fluid friction

b.

Sliding friction

c.

Static friction

d.

Rolling friction

Question number: 786

» Friction

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MCQ▾

Question

Two boys were conducting a race with their toy cars, which are similar in all aspects. They started the race simultaneously with same speed. One has selected a sandy surface and the other has selected a polished marble floor. The car running on the marble surface won the race. How will you explain this incident?

Choices

Choice (4) Response

a.

Sandy surface applied more friction on the car

b.

Polished marble surface applied more friction on the car

c.

Polished marble and Sandy the surface applied same friction on the cars

d.

None of the above

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