NSO Level 1- Science Olympiad (SOF) Class 8: Questions 714 - 716 of 1076

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Question number: 714

» Combustion and Flame

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MCQ▾

Question

The calorific value of a fuel is expressed in

Choices

Choice (4) Response

a.

Kilogram per litre

b.

Kilojoule per kilogram

c.

Joule per kilogram

d.

Kilojoule per litre

Question number: 715

» 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 tube

She observed that the match stick burnt with a pop sound. The gas produced due to chemical reaction would be.

Choices

Choice (4) Response

a.

Hydrogen

b.

Nitrogen

c.

Oxygen

d.

Carbon dioxide

Question number: 716

» 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 tubes

He observed that the match stick burnt with a pop sound.

The conclusion is aluminium reacts with sodium hydroxide releasing hydrogen gas. Which property of metals is proved here?

Choices

Choice (4) Response

a.

Metals react with sodium hydroxide to form hydrogen gas

b.

Metals react with acids to form hydrogen gas

c.

Non-metals react with bases to form hydrogen gas.

d.

Metals react with bases to form hydrogen gas

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