NSO Level 1- Science Olympiad (SOF) Class 8: Questions 663 - 665 of 1175

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Question 663

Question

MCQ▾

Sand, flint, quartz and opal are different forms of

Choices

Choice (4)Response

a.

Silica

b.

Sulphur

c.

Phosphorus

d.

Nitrogen

Question 664

Question

MCQ▾

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 665

Question

MCQ▾

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

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