NSO Level 1- Science Olympiad (SOF) Class 8: Questions 663 - 666 of 1076

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Question number: 663

» Metals and Non-Metals

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MCQ▾

Question

Sand, flint, quartz and opal are different forms of

Choices

Choice (4) Response

a.

Silica

b.

Sulphur

c.

Phosphorus

d.

Nitrogen

Question number: 664

» Metals and Non-Metals

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MCQ▾

Question

Harsh was doing experiment in the science lab. The steps of procedure are given here.

i) He took a test tube and put 3 - 4 pellets of sodium hydroxide in it.

ii) Added 5 ml water in it and dissolved the pellets in it.

iii) Added some pieces of aluminium foil in the solution.

iv) Brought a lighted match stick near the mouth of the test tube.

He observed that the match stick burnt with a pop sound. What does the pop sound indicate?

Choices

Choice (4) Response

a.

A gas which helps in combustion is produced due to chemical reaction.

b.

A highly inflammable gas is produced due to the chemical reaction

c.

A gas which extinguish the fire is produced due to the chemical reaction.

d.

All of the above

Question number: 665

» Reproduction in Animals

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MCQ▾

Question

Many women may fail to conceive due to problems in natural way of fertilisation. The scientific term for the method which can help them to bear a child is

Choices

Choice (4) Response

a.

Laboratory fertilisation

b.

Test tube fertilisation

c.

In-vitro fertilisation

d.

None of the above

Question number: 666

» Metals and Non-Metals

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MCQ▾

Question

Zinc is used as a coating in galvanization of iron. The possible reason is

Choices

Choice (4) Response

a.

Zinc is more reactive than iron.

b.

Zinc coating prevents the direct contact of oxygen and water with iron.

c.

Both a. and b. are correct

d.

None of the above

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