NSO Level 1- Science Olympiad (SOF) Class 8: Questions 679 - 682 of 1076

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Question number: 679

» Combustion and Flame

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MCQ▾

Question

Which of the following is used as an extinguisher when a fire is caused by oil?

Choices

Choice (4)Response

a.

Water

b.

Oxygen

c.

Carbon dioxide

d.

Question does not provide sufficient data or is vague

Passage

Image shows Metal Figure

Image Shows Metal Figure

Question number: 680 (1 of 3 Based on Passage) Show Passage

» Metals and Non-Metals

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MCQ▾

Question

In which of the given beakers displacement reaction would take place?

Choices

Choice (4)Response

a.

Beaker B

b.

Beaker A

c.

All of the above

d.

Question does not provide sufficient data or is vague

Question number: 681 (2 of 3 Based on Passage) Show Passage

» Metals and Non-Metals

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MCQ▾

Question

Both and are metals. We know that a metal replaces another metal from its compound in an aqueous solution. Here displacement reaction takes place only in fig B. The reason for this is

Choices

Choice (4)Response

a.

A more reactive metal replaces a less reactive metal

b.

A less reactive metal replaces a more reactive metal

c.

Question does not provide sufficient data or is vague

d.

All of the above

Question number: 682 (3 of 3 Based on Passage) Show Passage

» Metals and Non-Metals

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MCQ▾

Question

In fig. B after some time, the blue solution becomes colourless. The reason is

Choices

Choice (4)Response

a.

absorbs the blue colour and and makes the solution colourless

b.

replaces zinc and colourless solution is formed

c.

replaces Cu from and colourless solution is formed

d.

Question does not provide sufficient data or is vague

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