NSO Level 1- Science Olympiad (SOF) Class 8: Questions 692 - 693 of 1076

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Question number: 692

» Combustion and Flame

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MCQ▾

Question

Smita was given three liquids. She was asked to identify the liquids by testing their burning capacity. She took the liquids in different china dishes and marked them as A, B and C. Brought them near the flame of a candle. The observation is as follows

  • The liquid in A was highly inflammable. Immediately it caught fire and within a very short time the liquid disappeared.

  • B took little time and the flame spread into the dish and after some time the liquid disappeared leaving the dish sticky.

  • In C after some time bubbles started coming out from the liquid and it took comparatively longer time for the liquid to disappear. The flame did not spread in to the dish.

The conclusion would be

Choices

Choice (4)Response

a.

A-petrol and B-cooking oil, C-water

b.

A-water, B-cooking oil and C-petrol

c.

A-cooking oil, B-petrol and C-water

d.

A-water, B-petrol and C-cooking oil

Question number: 693

» Combustion and Flame

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MCQ▾

Question

X and Y are two fuels. The properties are given below. Find out the ideal fuel

Table of type of fule

Table of type of fule

Fuel X

Fuel Y

Easily available

Not easy to get

Cheap

Costly

Easily burns in air

Easily burns in air

Do not produce any undesirable products on burning

Produce undesirable products on burning

Give out large quantity of heat

Give out large quantity of heat

Choices

Choice (4)Response

a.

X is an ideal fuel

b.

Y is an ideal fuel

c.

X and Y are ideal fuels

d.

Neither X nor Y is an ideal fuel

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