NSO Level 1- Science Olympiad (SOF) Class 8: Questions 717 - 724 of 1076

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Question number: 717

» Combustion and Flame

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MCQ▾

Question

Sound is produced in explosion. The reason is

Choices

Choice (4) Response

a.

The hot gases expand rapidly and cause explosion

b.

Explosion is a rapid reaction where heat light and sound are produced

c.

The gases produced on burning are heated by the heat evolved in the reaction.

d.

All a. , b. and c. are correct

Question number: 718

» Reproduction in Animals

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MCQ▾

Question

Number of ova produced by ovary at a time is

Choices

Choice (4) Response

a.

40 million to 1.2 billion

b.

10000 to 100000

c.

1

d.

100 to 1000

Question number: 719

» Combustion and Flame

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MCQ▾

Question

Reeta’s mother brought a burning match stick near the gas burner. As soon as she turned on the knob, the gas burned. This is an example of

Choices

Choice (4) Response

a.

Incomplete combustion

b.

Rapid combustion

c.

Explosion

d.

Spontaneous combustion

Passage

Study the picture carefully and answer the question

 Image of Flame

Image of Flame

Image of Flame

Question number: 720 (1 of 5 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

Colour of the middle zone of the flame is

Choices

Choice (4) Response

a.

Red

b.

Yellow

c.

Black

d.

Blue

Question number: 721 (2 of 5 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

Colour of the outermost zone of the flame is

Choices

Choice (4) Response

a.

Red

b.

Yellow

c.

Black

d.

Blue

Question number: 722 (3 of 5 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

Colour of the innermost zone of the flame is

Choices

Choice (4) Response

a.

Blue

b.

Yellow

c.

Red

d.

Black

Question number: 723 (4 of 5 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

Which of the three zones is the hottest?

Choices

Choice (4) Response

a.

Outermost zone

b.

Middle zone

c.

Innermost zone

d.

All of the above

Question number: 724 (5 of 5 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

Which zone of the flame does a goldsmith use for melting gold?

Choices

Choice (4) Response

a.

Innermost zone

b.

Outermost zone

c.

Middle zone

d.

All of the above

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