NSO Level 1- Science Olympiad (SOF) Class 8: Questions 725 - 728 of 1076

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Question number: 725

» Metals and Non-Metals

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MCQ▾

Question

When dilute sulphuric acid is poured on a copper strip, the strip changes to blue in colour and a gas is produced. Identify the products formed.

Choices

Choice (4) Response

a.

Sulphur dioxide and hydrogen

b.

Copper sulphate and hydrogen

c.

Cupric oxide and hydrogen

d.

Copper sulphate and oxygen

Question number: 726

» Metals and Non-Metals

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MCQ▾

Question

Diya was doing experiment. The steps of procedure are given here.

i) She took a test tube and put small pieces of copper wire in it.

ii) Added 4 to 5 drops of dilute sulphuric acid in test tube.

iii) Brought a lighted match stick near the mouth of the test tubes

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

Choices

Choice (4) Response

a.

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

b.

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

c.

A highly inflammable gas is produced due to the chemical reaction

d.

Question does not provide sufficient data or is vague

Question number: 727

» Coal and Petroleum

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MCQ▾

Question

Hydrogen is a highly inflammable gas. The product formed when hydrogen burns in air is

Choices

Choice (4) Response

a.

Hydrogen peroxide

b.

Hydroxide

c.

Water

d.

All of the above

Question number: 728

» Reproduction in Animals

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MCQ▾

Question

Which of the following is not an example of an oviparous animal?

Choices

Choice (4) Response

a.

Frog

b.

Crocodile

c.

Duck

d.

Blue whale

Developed by: