NSO Level 1- Science Olympiad (SOF) Class 8: Questions 708 - 711 of 1076

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Question number: 708

» Combustion and Flame

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MCQ▾

Question

A substance which burns in air easily to give out a large quantity of heat without producing any undesirable product is called a

Choices

Choice (4)Response

a.

Fuel

b.

Combustible substance

c.

Inflammable substance

d.

Explosive

Passage

Rutu took two paper cones A and B and poured some water in A. Then she heated both the cones as shown in figure. Observe the picture and answer the questions

Image of two Cone Paper

Image of Two Cone Paper

Question number: 709 (1 of 4 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

When she continue heating the cone A, water in the cone changes to vapour and finally it dries up and the cone begins to burn. Explanation for this fact is

Choices

Choice (4)Response

a.

Paper cone attains ignition temperature and start burning.

b.

Water boils and changes to vapour

c.

Paper passes heat to water by conduction.

d.

All a. , b. and c. are correct

Question number: 710 (2 of 4 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

When she tries to burn the paper cones, which cone will burn first?

Choices

Choice (4)Response

a.

Cone A

b.

Cone A and B will burn together

c.

Cone B

d.

Cone A and B will not burn

Question number: 711 (3 of 4 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

When she tried to burn the cones, she observed that cone B burnt first and cone A took a long time. How will you explain this situation?

Choices

Choice (4)Response

a.

The ignition temperature of A is less than that of B

b.

The ignition temperature of B is less than that of A

c.

The ignition temperature of both A and B are same

d.

The ignition temperature of a substance do not have any relation with burning

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