NSO Level 1- Science Olympiad (SOF) Class 8: Questions 693 - 697 of 1076

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Question number: 693

» Combustion and Flame

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MCQ▾

Question

X and Y are two fuels. The properties are given below. Find out the ideal fuel

Table of type of fule

Table of type of fule

Fuel X

Fuel Y

Easily available

Not easy to get

Cheap

Costly

Easily burns in air

Easily burns in air

Do not produce any undesirable products on burning

Produce undesirable products on burning

Give out large quantity of heat

Give out large quantity of heat

Choices

Choice (4) Response

a.

X is an ideal fuel

b.

Y is an ideal fuel

c.

X and Y are ideal fuels

d.

Neither X nor Y is an ideal fuel

Question number: 694

» Combustion and Flame

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MCQ▾

Question

The substance with highest ignition temperature among the following fuels is

Choices

Choice (4) Response

a.

Coal

b.

Petrol

c.

Kerosene

d.

Alcohol

Question number: 695

» Combustion and Flame

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MCQ▾

Question

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 number: 696

» Metals and Non-Metals

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MCQ▾

Question

Diamond and graphite are different forms of

Choices

Choice (4) Response

a.

Silica

b.

Sulphur

c.

Phosphorus

d.

Carbon

Question number: 697

» Reproduction in Animals

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MCQ▾

Question

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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