NSO Level 1- Science Olympiad (SOF) Class 8: Questions 704 - 707 of 1175

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Question 704

Question

MCQ▾

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 705

Question

MCQ▾

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 706

Question

MCQ▾

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 707

Question

MCQ▾

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

Choices

Choice (4)Response

a.

Phosphorus

b.

Sulphur

c.

Carbon

d.

Copper

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