NSO Level 1- Science Olympiad (SOF) Class 8: Questions 719 - 725 of 1076

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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

Question number: 720 (1 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

Question number: 721 (2 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: 722 (3 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: 723 (4 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: 724 (5 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: 725

» Metals and Non-Metals

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MCQ▾

Question

When dilute sulphuric acid is poured on a copper strip, the strip changes to blue in colour and a gas is produced. Identify the products formed.

Choices

Choice (4)Response

a.

Sulphur dioxide and hydrogen

b.

Copper sulphate and hydrogen

c.

Cupric oxide and hydrogen

d.

Copper sulphate and oxygen

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