NSO Level 2- Science Olympiad (SOF) Class 4: Questions 4 - 6 of 165

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Question number: 4

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Appeared in Year: 2016

MCQ▾

Question

Harshit wanted to find out among the four locations - playground, science laboratory, school garden and the bus stop outside his school - which is the most polluted. He placed four glass tiles smeared with petroleum jelly at the four locations for the same period of time for one day and recorded his observation. However, his teacher told him that his experiment was not reliable because he did not.

Choices

Choice (4)Response

a.

Wet the glass tiles

b.

Examine the tiles with hand lens

c.

Repeat the experiment over a few days

d.

Use tiles made of different materials

Question number: 5

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Appeared in Year: 2016

MCQ▾

Question

Study the given diagram carefully. Candle wax was coated at different parts P, Q, R and S of the metal rod. Which one of the following is the correct order in which the wax would melt?

Image shows The Diagram of Wax and Candle

Image Shows the Diagram of Wax and Candle

Choices

Choice (4)Response

a.

S, R, Q, P

b.

R, Q, S, P

c.

R, Q, P, S

d.

P, Q, R, S

Question number: 6

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Appeared in Year: 2016

MCQ▾

Question

The movements of the hot and cold air set up a convection current. This explains why.

Choices

Choice (4)Response

a.

An air conditioner is placed at the ceiling end of the wall.

b.

A heater is placed as low as possible in room.

c.

The back of a refrigerator is often painted black.

d.

Both a. and b. are correct

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