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Test: Combustion & Flame- 2


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20 Questions MCQ Test Science & Technology for UPSC CSE | Test: Combustion & Flame- 2

Test: Combustion & Flame- 2 for UPSC 2022 is part of Science & Technology for UPSC CSE preparation. The Test: Combustion & Flame- 2 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Combustion & Flame- 2 MCQs are made for UPSC 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Combustion & Flame- 2 below.
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Test: Combustion & Flame- 2 - Question 1

A combustible substance is :-

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

Those substances that start burning at ignition temperature in presence of oxygen is called combustible substance. Water, glass and sand are non combustible substance while wax is a combustible substance.

Test: Combustion & Flame- 2 - Question 2

Water works as a fire extinguisher by removing :-

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

Water works as a fire extinguisher because it removes oxygen and lower down the temperature below the ignition temperature.

Test: Combustion & Flame- 2 - Question 3

We can extinguish fire by :-

Detailed Solution for Test: Combustion & Flame- 2 - Question 3

Fire can be extinguished by cutting the supply of oxygen and removing combustible substances from surrounding or lowering the temperature below the ignition temperature.

Test: Combustion & Flame- 2 - Question 4

Non combustible substances do not burn in :

Detailed Solution for Test: Combustion & Flame- 2 - Question 4

Non combustible substance does not burn in air or oxygen. Carbon is generally absent in non-combustible substance or present in very less quantity.

Test: Combustion & Flame- 2 - Question 5

The gas which supports combustion of coal is :

Detailed Solution for Test: Combustion & Flame- 2 - Question 5

Oxygen gas supports the combustion of combustible substances including coal. Combustion of coal release carbon dioxide gas as well as solid residue.

Test: Combustion & Flame- 2 - Question 6

If methane is burnt in sufficient oxygen the products formed are :

Detailed Solution for Test: Combustion & Flame- 2 - Question 6

If methane is burnt in sufficient oxygen, the products formed are carbon dioxide and water. CNG and biogas contain mainly methane gas.

Test: Combustion & Flame- 2 - Question 7

Many harmful gases are produced during :

Detailed Solution for Test: Combustion & Flame- 2 - Question 7

Incomplete combustion of fuels release harmful gases like carbon monoxide. Carbon monoxide binds with haemoglobin and reduces the oxygen carrying capacity of blood.

Test: Combustion & Flame- 2 - Question 8

SI unit of the calorific value of a fuel is :-

Detailed Solution for Test: Combustion & Flame- 2 - Question 8

Calorific value provides the amount of energy that is released when a fuel or material undergoes the process of combustion.

It is usually a measure of energy.

The SI unit (international system of units) of calorific value is Joule/Kg or Kilo Joule/Kg.

Test: Combustion & Flame- 2 - Question 9

A material that burns is one that can combine quickly with :

Detailed Solution for Test: Combustion & Flame- 2 - Question 9

Those materials that combine with oxygen quickly burns faster. Oxygen help in combustion of substance by oxidising the carbon substance into carbon dioxide gas.

Test: Combustion & Flame- 2 - Question 10

Middle zone of candle flame is also known as zone of :

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The middle zone of candle flame is known as zone of partial combustion. This zone is generally yellow in colour and has less heat.

Test: Combustion & Flame- 2 - Question 11

Burning of a matchstick is an example of :

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Burning of a matchstick is an example of rapid combustion. Matchstick contains phosphorus that catches fire due to heat produce by friction.

Test: Combustion & Flame- 2 - Question 12

Fire caused by burning liquid fuels can be controlled by throwing :

Detailed Solution for Test: Combustion & Flame- 2 - Question 12

Fire caused by burning of liquid fuels can be controlled by throwing soil and sand over it to avoid the contact of oxygen that supports the combustion.

Test: Combustion & Flame- 2 - Question 13

No external heat is required to start :

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Spontaneous combustion occurs itself with external heat. Spontaneous combustion occurs in those substances that have very low ignition temperature, lower than room temperature.

Test: Combustion & Flame- 2 - Question 14

Burning of LPG is an example of :

Detailed Solution for Test: Combustion & Flame- 2 - Question 14

Burning of liquefied petroleum gas (LPG) is an example of rapid combustion. Rapid combustion starts very fast and lot of heat and light energy is produced.

Test: Combustion & Flame- 2 - Question 15

Some substances burn on their own when kept exposed in air for some time for example :

Detailed Solution for Test: Combustion & Flame- 2 - Question 15

Phosphorus is generally found as a waxy, yellow, transparent solid. When exposed to air, it spontaneously ignites and is oxidized rapidly to phosphorus pentoxide. Such heat is produced by this reaction that the element bursts into a yellow flame and produces a dense white smoke.

Test: Combustion & Flame- 2 - Question 16

If a glass plate/slide is held into the luminous part of candle flame we see a circular blackish ring that represents:

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When a glass plate or slide is held into the luminous part of candle flame we see a circular blackish ring that represents unburnt carbon particles.

Test: Combustion & Flame- 2 - Question 17

The colour of the hottest part of the flame is :

Detailed Solution for Test: Combustion & Flame- 2 - Question 17

Different zone is formed in the flame having different colour. The hottest part of the flame is blue in colour present on the upper part of flame.

Test: Combustion & Flame- 2 - Question 18

At its ignition temperature a combustible material :

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Combustible substance changes into vapour at its ignition temperature and start burning to give heat and light.

Test: Combustion & Flame- 2 - Question 19

Sodium can catch fire without any :

Detailed Solution for Test: Combustion & Flame- 2 - Question 19

Sodium can catch fire without any external heat supply when come in contact with oxygen. Sodium is kept under kerosene oil to prevent accidental fire and protecting the sodium metal.

Test: Combustion & Flame- 2 - Question 20

It is dangerous to extinguish fire caused by an electric short circuit with the use of :

Detailed Solution for Test: Combustion & Flame- 2 - Question 20

Fire caused by an electric short circuit should not be extinguished by using water because water is good conductor of electricity and may cause electric shock.

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