NSO Level 1- Science Olympiad (SOF) Class 8: Questions 704 - 708 of 1076

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Question number: 704

» 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.

The conclusion is copper reacts with sulphuric acid releasing hydrogen gas.

Which property of metals is proved here?

Choices

Choice (4) Response

a.

Non-metals react with acids to form hydrogen gas

b.

Metals react with acids to form oxygen gas.

c.

Metals react with acids to form hydrogen gas

d.

Metals react with bases to form hydrogen gas

Question number: 705

» Combustion and Flame

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MCQ▾

Question

Disastrous fires that occur in coal mines due to sun’s heat or lightning are examples of

Choices

Choice (4) Response

a.

Spontaneous combustion

b.

Explosion

c.

Incomplete combustion

d.

Rapid combustion

Question number: 706

» Combustion and Flame

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MCQ▾

Question

Here are the reasons of wild fire. Which of them is an incorrect reason?

Choices

Choice (4) Response

a.

Deforestation

b.

Carelessness of human

c.

Lightning

d.

Heat of the sun

Question number: 707

» Metals and Non-Metals

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MCQ▾

Question

Which of the following element can be used for making utensils?

Choices

Choice (4) Response

a.

Phosphorus

b.

Sulphur

c.

Carbon

d.

Copper

Question number: 708

» Combustion and Flame

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MCQ▾

Question

A substance which burns in air easily to give out a large quantity of heat without producing any undesirable product is called a

Choices

Choice (4) Response

a.

Fuel

b.

Combustible substance

c.

Inflammable substance

d.

Explosive

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