NSO Level 1- Science Olympiad (SOF) Class 8: Questions 641 - 647 of 1076

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Question number: 641

» Combustion and Flame

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MCQ▾

Question

It is not advisable to sleep in a closed room with smouldering coal fire. The reason is

Choices

Choice (4)Response

a.

Carbon monoxide is a poisonous gas

b.

Incomplete combustion of carbon fuels produce carbon monoxide.

c.

Inhaling carbon monoxide for a long time can cause death

d.

All a. , b. and c. are correct

Question number: 642

» Reproduction in Animals

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MCQ▾

Question

The organ which produces ovum is called

Choices

Choice (4)Response

a.

Testes

b.

Uterus

c.

Penis

d.

Ovary

Question number: 643

» Metals and Non-Metals

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MCQ▾

Question

Metals are generally hard and non-brittle. Find the metal which is soft and brittle

Choices

Choice (4)Response

a.

Lead

b.

Sodium

c.

Potassium

d.

All a. , b. and c. are correct

Question number: 644

» Metals and Non-Metals

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MCQ▾

Question

Arrange the following metals in the descending order of their reactivity.

Zinc Copper , Iron

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 645

» Metals and Non-Metals

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MCQ▾

Question

Silver tarnishes due to the reaction with this non-metal in the air

Choices

Choice (4)Response

a.

Carbon dioxide

b.

Oxygen

c.

Hydrogen sulphide

d.

Nitrogen

Question number: 646

» Reproduction in Animals

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MCQ▾

Question

The stage of the embryo in which all the body parts can be identified is called

Choices

Choice (4)Response

a.

Foetus

b.

Embryo

c.

Gamete

d.

None of the above

Question number: 647

» Combustion and Flame

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MCQ▾

Question

Which type of energy is released when an explosion takes place?

Choices

Choice (4)Response

a.

Heat

b.

Sound

c.

Light

d.

All a. , b. and c. are correct

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