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Test: Combustion & Flame- 1 - Class 8


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10 Questions MCQ Test - Test: Combustion & Flame- 1

Test: Combustion & Flame- 1 for Class 8 2023 is part of Class 8 preparation. The Test: Combustion & Flame- 1 questions and answers have been prepared according to the Class 8 exam syllabus.The Test: Combustion & Flame- 1 MCQs are made for Class 8 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Combustion & Flame- 1 below.
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Test: Combustion & Flame- 1 - Question 1

A paper-wrapped tightly around the joint of a brass tube and its wooden handle is put in a flame, the paper will:

Detailed Solution for Test: Combustion & Flame- 1 - Question 1

Brass is a good conductor of heat so it will not burn in flame. But wood is a bad conductor of heat therefore paper-wrapped around the wooden handle will burn.
Hence the correct option is  D.

Test: Combustion & Flame- 1 - Question 2

Combustion is a _____ chemical reaction:

Detailed Solution for Test: Combustion & Flame- 1 - Question 2

Burning of any substance in presence of oxygen is called combustion. During combustion heat is evolved so, combustion is exothermic chemical reaction in which new substance is formed.

Test: Combustion & Flame- 1 - Question 3

Substance that burns in oxygen to produce heat and light is called :

Detailed Solution for Test: Combustion & Flame- 1 - Question 3

Those substances that burn in presence of oxygen to produce heat and light is called combustible substance. Fossil fuels, wood, paper etc are example of combustible substance.

Test: Combustion & Flame- 1 - Question 4

The gas used in fire extinguishers is

Detailed Solution for Test: Combustion & Flame- 1 - Question 4

Carbon dioxide gas is used in fire extinguisher to cut the oxygen supply.
Option A is correct.

Test: Combustion & Flame- 1 - Question 5

Which fuels are used for running automobiles?

Detailed Solution for Test: Combustion & Flame- 1 - Question 5

Diesel is more combustible than these fuels,it releases energy rapidly.

Test: Combustion & Flame- 1 - Question 6

Cutting trees at large scale leads to :

Detailed Solution for Test: Combustion & Flame- 1 - Question 6

Cutting of trees at large scale leads to deforestation. Deforestation may cause desertification and loss of living natural resources.

Test: Combustion & Flame- 1 - Question 7

Amount of heat energy produced on complete combustion of 1kg of fuel is called :

Detailed Solution for Test: Combustion & Flame- 1 - Question 7

The amount of heat energy released on complete combustion of 1 kg of fuel is called calorific value of that fuel. Higher the calorific value better the fuel is considered.

Test: Combustion & Flame- 1 - Question 8

Complete combustion of CH4 gives:

Detailed Solution for Test: Combustion & Flame- 1 - Question 8

In a combustion reaction, a substance reacts with oxygen from the air and transfers energy to the surroundings as light and heat.
The products of a complete combustion reaction include carbon dioxide(CO2) and water vapor(H2O).
CH4+2O2 - > CO2+ 2H2O
Hence, option A is correct.

Test: Combustion & Flame- 1 - Question 9

Fire-related deaths are mostly due to:

Test: Combustion & Flame- 1 - Question 10

Lowest temperature at which a substrate catches fire is called its :

Detailed Solution for Test: Combustion & Flame- 1 - Question 10

The lowest temperature at which substance catch fire is called ignition temperature. The fuel with moderate temperature is considered better fuel for domestic use.

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