NSO Level 1- Science Olympiad (SOF) Class 8: Questions 594 - 599 of 1076

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Question number: 594

» Combustion and Flame

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MCQ▾

Question

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 number: 595

» Combustion and Flame

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MCQ▾

Question

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 number: 596

» Reproduction in Animals

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MCQ▾

Question

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 number: 597

» Combustion and Flame

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MCQ▾

Question

Burning a substance in air producing heat is called

Choices

Choice (4)Response

a.

Bursting

b.

Fire

c.

Digestion

d.

Combustion

Question number: 598

» Reproduction in Animals

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MCQ▾

Question

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

Image of safety Matchstick

Image of Safety Matchstick

Question number: 599 (1 of 6 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

When matchsticks are struck against rubbing surface, red phosphorous

Choices

Choice (4)Response

a.

Reacts with potassium chlorate

b.

Ignite antimony disulphide

c.

Converts into white phosphorous

d.

Question does not provide sufficient data or is vague

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