NSO Level 1- Science Olympiad (SOF) Class 8: Questions 590 - 594 of 1076

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Question number: 590

» Combustion and Flame

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MCQ▾

Question

Phosphorous is stored under water. The reason is

Choices

Choice (4) Response

a.

Ignition temperature of phosphorous is lower than room temperature

b.

It undergoes spontaneous combustion in room temperature

c.

Both a. and b. are correct

d.

None of the above

Question number: 591

» Metals and Non-Metals

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MCQ▾

Question

Generally non-metals are poor conductors of heat and electricity but this non-metal is a good conductor of heat and electricity.

Choices

Choice (4) Response

a.

Carbon

b.

Graphite

c.

Phosphorus

d.

None of the above

Question number: 592

» Metals and Non-Metals

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MCQ▾

Question

The process of applying Zinc coating to iron to prevent rusting is called

Choices

Choice (4) Response

a.

Galvanization

b.

Painting

c.

Ionization

d.

Vulcanization

Question number: 593

» Reproduction in Animals

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MCQ▾

Question

Most of the birds lay one egg at a time but reptiles lay many eggs at a time. The explanation of this statement is

Choices

Choice (4) Response

a.

Reptiles do not take care of their eggs.

b.

There are chances of other animals to feed on eggs and destroy them.

c.

Birds brood on eggs and take care of them till they hatch out to young ones.

d.

All a. , b. and c. are correct

Question number: 594

» Combustion and Flame

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MCQ▾

Question

Oxygen is necessary for combustion. The role of oxygen in combustion is

Choices

Choice (4) Response

a.

It is an inflammable gas

b.

It is a fire extinguisher

c.

It controls combustions

d.

It helps in combustion.

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