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Combustion and Flame

Description: more about fuels and combustion
Number of Questions: 15
Created by:
Tags: COMBUSTION AND FLAME Combustion, Types of Combustion Harmful Effects on Burning of Fuels Fuel and Fuel Efficiency Fuel, Fuel Efficiency, Harmful Effects on Burning of Fuels. Polynomials Non-Verbal Reasoning Reactions in Everyday Life Word Problems Coding/Decoding
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What is ignition temperature?

  1. Time required for a material to burn out completely

  2. Lowest temperature at which a substance catches fire

  3. A higher temperature, which will cause it to burn faster

  4. Time required for the fire to be put out

  5. Temperature at which the fire is put out

Show answer
Correct Option: B
Explanation:

The lowest temperature at which a substance catches fire is called its ignition temperature.

A person's clothes are on fire. Which of the following should be done?

  1. Ask the person to run around so that the fire will be put out

  2. Pour water on him

  3. Cover the person with a blanket

  4. Ask the person to move around slowly

Show answer
Correct Option: C
Explanation:

The person should be covered with a blanket so that air supply is cut off. Thus, fire will be put out.

Why a match stick does not catch fire on its own at room temperature?

  1. Because catalyst is absent.

  2. Because sunlight is needed.

  3. Because phosphorus is absent on match stick.

  4. Because room temperature is lower than ignition temperature of the matchstick.

  5. Because carbon dioxide in the air prevents combustion.

Show answer
Correct Option: D
Explanation:

This is the correct option. Any substance will catch fire only when its ignition temperature is reached. But room temperature is lower than the ignition temperature of the matchstick.

Which of the following is not an inflammable substance?

  1. Wood

  2. Alcohol

  3. Petrol

  4. Liquid ammonia

  5. LPG

Show answer
Correct Option: A
Explanation:

Wood is not an inflammable substance. It does not catch fire easily.

A conical cup is made by folding a square piece of paper. Water is poured in it and heated over a candle flame. The paper cone does not get burnt off, and after some time the water boils. This is due to

  1. convection

  2. radiation

  3. conduction

  4. condensation

  5. combustion

Show answer
Correct Option: C
Explanation:

Heat supplied to the paper cone is transferred to the water by conduction.

Water should not be used to extinguish the fire in case of

  1. a wooden house on fire

  2. an electrical equipment on fire

  3. fire in a paper mill

  4. fire in a godown with grains

  5. forest fire

Show answer
Correct Option: B
Explanation:

Water conducts electricity, and thus can endanger people.

CNG is a better fuel than petrol or diesel in automobiles. Which of the following is not a correct reasoning for this statement?

  1. CNG burns more efficiently.

  2. It is expensive.

  3. It cannot be siphoned off by thieves.

  4. CNG produces less harmful products.

  5. It is cheaper.

Show answer
Correct Option: B
Explanation:

It is not very expensive.

When fire fighters pour water to put out fire, which of the following does not happen?

  1. Water cools the material.

  2. It prevents fire from spreading.

  3. Temperature is brought below ignition temperature.

  4. Water vapours around the material cuts off supply of air.

  5. Water splits to give oxygen.

Show answer
Correct Option: E
Explanation:

Splitting of water does not happen in this case.

Which of the following is not an example of spontaneous combustion?

  1. Phosphorus burning in air

  2. Forest fire due to lightning

  3. Burning of charcoal

  4. Combustion of coal dust in a coal mine

  5. Forest fire due to heat of the sun

Show answer
Correct Option: C
Explanation:

Burning of charcoal cannot happen spontaneously.

Which fuel is used by fire dancers who perform acts like fire breathing?

  1. Kerosene

  2. Petrol

  3. Aviation fuel

  4. Alcohol

  5. Diesel

Show answer
Correct Option: A
Explanation:

Kerosene is comparatively less dangerous. So, it is used by such performers.

Oxides of sulphur and nitrogen are produced by burning of fossil fuels. These two oxides are the major culprits for______________ phenomenon.

  1. greenhouse effect

  2. el-nino effect

  3. acid rain

  4. eutrophication

  5. bio-geo chemical cycles

Show answer
Correct Option: C
Explanation:

Oxides of sulphur and nitrogen mix with moisture to form sulphuric acid and nitric acid, respectively. These come down as acid rain, which is harmful for organisms, marble structures, buildings, etc.

Which gas is linked to global warming?

  1. Oxides of nitrogen

  2. Ozone

  3. Oxides of sulphur

  4. Hydrogen sulphide

  5. Carbon dioxide

Show answer
Correct Option: E
Explanation:

Carbon dioxide is a greenhouse gas.

Calorific value of a fuel is

  1. time needed for one kilogram of fuel to be burnt out completely

  2. change in state of the fuel

  3. time needed for half kilogram of fuel to be burnt out completely

  4. amount of heat energy produced on complete combustion of one kilogram of fuel

  5. heat energy needed to burn the fuel

Show answer
Correct Option: D
Explanation:

The amount of heat energy produced on complete combustion of one kilogram of fuel is called its calorific value.

Fire broke out in a kitchen. The lady in the house did not have a fire extinguisher, but she was wise enough to use a dry chemical in her kitchen to put out the fire. What material could she use?

  1. Salt

  2. Chilli powder

  3. Sugar

  4. Baking soda

  5. Turmeric powder

Show answer
Correct Option: D
Explanation:

Sodium bicarbonate or baking soda gives out carbon dioxide gas, which helps to put out the fire easily.

A few people were staying in a room. On a cold night, when there was no electricity, one of them suggested that they burn coal in the room in order to get warmth. The others immediately declined this option. What could be the reason for this?

  1. Carbon monoxide is produced.

  2. Coal is expensive.

  3. Black soot will get deposited.

  4. Carbon dioxide is produced.

  5. Coal will get over-heated.

Show answer
Correct Option: A
Explanation:

Carbon monoxide is produced, and this can be fatal for the people in the room.

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