NSO Level 1- Science Olympiad (SOF) Class 4: Questions 396 - 398 of 435

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Question number: 396

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Question

Ravi put a coin on a marble-topped table and flicked it with his finger. He used a ruler to measure the distance travelled by the coin. Then he carried out, the same test by laying a piece of sand paper, a newspaper, and a towel in turns, on the table. On which surface will the coin travel farthest?

Choices

Choice (4) Response

a.

Marble top

b.

Newspaper

c.

Sand paper

d.

Towel

Question number: 397

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Preeta put her hand above the flame of the candle. She could not hold her hand above the flame for more than few seconds. Whereas, when she brought her hands close to the sides of the flame, she felt the warmth of the flame and held her hands in that position for a longer time. Which of the following justifies this?

Image shows two candles

Image Shows Two Candles

This image shows two candles

Choices

Choice (4) Response

a.

The candle flame always burns upwards.

b.

The candle flame always burns downwards.

c.

The hot air spreads in all directions.

d.

The hot air rises up.

Question number: 398

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Question

Mechanical systems are made up of a combination of simple machines. The egg-beater as shown here is one such system.

Image shows the egg-beater

Image Shows the Egg-Beater

This image shows the egg-beater

Which simple machines combine to make the egg-beater?

M: Lever

N: Pulley

O: Wheel and axle

P: Gears

Choices

Choice (4) Response

a.

M, N and O

b.

O and P

c.

M and N

d.

N, O and P

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