NSO Level 1- Science Olympiad (SOF) Class 8: Questions 956 - 958 of 1076

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Question number: 956

» Chemical Effects of Electric Current

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MCQ▾

Question

Materials which allow electricity to pass through them easily are called

Choices

Choice (4)Response

a.

Insulators

b.

Good conductors

c.

Poor conductors

d.

All of the above

Question number: 957

» Chemical Effects of Electric Current

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Appeared in Year: 2012

MCQ▾

Question

Sudha took a small amount of sulphur in deflagrating spoon and heated it over a burner. As soon as it started burning, she put it in gas jar and covered with a lid. After sulphur stopped burning, she added a small amount of water in it and dissolved the gas in water by shaking it. She then tested the solution with red and blue litmus paper. What did she observe?

Image shows Tasting of Litmus Paper

Image Shows Tasting of Litmus Paper

Choices

Choice (4)Response

a.

There was no change in the colour of litmus paper.

b.

Blue litmus paper turned red and red litmus paper turned blue.

c.

In the solution the red litmus paper turned blue.

d.

In the solution the blue litmus paper turned red.

Question number: 958

» Combustion and Flame

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Appeared in Year: 2012

MCQ▾

Question

If Raman opened the air hole of a Bunsen burner fully and lighted the burner he will get ________.

Choices

Choice (4)Response

a.

A non -luminous flame, which is pale blue in colour.

b.

A flame that strike back, which is thin blue or green-yellow in colour.

c.

A luminous flame, which is orange-yellow in colour.

d.

A smoky flame, which gives off a lot of soot.

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