NSO Level 1- Science Olympiad (SOF) Class 8: Questions 694 - 697 of 1175

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Question 694

Question

MCQ▾

The substance with highest ignition temperature among the following fuels is

Choices

Choice (4)Response

a.

Coal

b.

Petrol

c.

Kerosene

d.

Alcohol

Question 695

Question

MCQ▾

Green leaves do not catch fire easily but dry leaves catch fire at once. The possible reason would be

Choices

Choice (4)Response

a.

Green leaves have a high ignition temperature than dry leaves.

b.

Presence of moisture increases the ignition temperature of green leaves.

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

Question 696

Question

MCQ▾

Diamond and graphite are different forms of

Choices

Choice (4)Response

a.

Silica

b.

Sulphur

c.

Phosphorus

d.

Carbon

Question 697

Question

MCQ▾

Aquatic animals lay thousands of eggs at a time while reptiles lay comparatively less number of eggs. The reason is

Choices

Choice (4)Response

a.

Other aquatic animals feed on the eggs and young ones. So the chances of survival is less.

b.

The movement of sperms and eggs is controlled by wind and movement of water. So the chances of fertilisation is less.

c.

External fertilisation takes place in most of the aquatic animals while internal fertilisation takes place in reptiles.

d.

All a., b. and c. are correct

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