Friction [NSO Level 1- Science Olympiad (SOF) Class 8]: Questions 6 - 9 of 65

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Question 6

Question MCQ▾

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

Edit

Question 7

Question MCQ▾

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

Edit

Question 8

Question MCQ▾

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

Edit

Question 9

Question MCQ▾

When Riya slipped while walking through the passage, her teacher advised her to change her worn out shoe. The reason is

Choices

Choice (4)Response

a.

Smooth surface experiences less friction

b.

She slipped because of less friction

c.

The soul of a worn out shoe is smooth

d.

All a., b. and c. are correct

Edit