NSO Level 1- Science Olympiad (SOF) Class 8: Questions 594 - 599 of 1175

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Question 594

Question

MCQ▾

Oxygen is necessary for combustion. The role of oxygen in combustion is

Choices

Choice (4)Response

a.

It is an inflammable gas

b.

It is a fire extinguisher

c.

It controls combustions

d.

It helps in combustion.

Question 595

Question

MCQ▾

Burning hydrocarbon fuels in the absence of enough air may cause adverse effect. The reason behind this statement is

Choices

Choice (4)Response

a.

Carbon monoxide is a poisonous gas.

b.

Hydrocarbons burn in sufficient oxygen to produce carbon dioxide and water.

c.

Hydrocarbons burn in insufficient oxygen to form carbon monoxide.

d.

Both a. and c. are correct

Question 596

Question

MCQ▾

Number of sperms produced by testes at a time is

Choices

Choice (4)Response

a.

100 to 1000

b.

40 million to 1.2 billion

c.

10000 to 100000

d.

1

Question 597

Question

MCQ▾

Burning a substance in air producing heat is called

Choices

Choice (4)Response

a.

Bursting

b.

Fire

c.

Digestion

d.

Combustion

Question 598

Question

MCQ▾

Reproduction by the union of male and female gametes is called

Choices

Choice (4)Response

a.

Vegetative reproduction

b.

Asexual reproduction

c.

Sexual reproduction

d.

None of the above

Passage

Study the pictures carefully and answer the question

Safety Matchstick

Question 599 (1 of 6 Based on Passage)

Question

MCQ▾

The head of the safety match sticks contain potassium chlorate, sulphur and glass powder. Here the role of glass powder is

Choices

Choice (4)Response

a.

It gives necessary friction for combustion

b.

It acts an oxidiser

c.

It is the fuel for combustion

d.

It ignites the fuel

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