Combustion and Flame Test

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Combustion and Flame Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Why electrical equipment on burning do not extinguished fire by water?

A
Water shows exothermic reaction with electrical equipment.

B
Water conduct electricity with electrical equipment's.

C
Water shows endothermic reaction.

D
Water is a combustible substance.

Solution

Water is the conductor of electricity and it can conducts electricity with electrical equipment. So when electrical equipment is on fire it can harm those trying to douse the fire. Therefore water is not used to extinguished fire caused by electrical equipment.

Hence, the correct option is $$B$$
Question 2
1 / -0

Which of the following releases least amount of pollutants on combustion?

A
Diesel

B
Coal gas

C
C.N.G

D
None of these

Solution

C.N.G is a cleaner fuel and releases less amount of $$CO_2$$ with almost no particulate emissions.
Question 3
1 / -0

How many zones are present in candle flame?

A
2

B
3

C
4

D
5

Solution

A flame consist of three zones. These are the Innermost zone, middle zone, outer zone. The three zones of a flame have different colors and different temperatures.
Hence, option B is correct.
Question 4
1 / -0

For burning, ....... is needed.

A
water

B
air

C
soil

D
land

Solution

For burning, air is necessary. In the absence of air no burning happens.
Question 5
1 / -0

On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of the non-availability of:

A
oxygen

B
water vapour

C
carbon dioxide

D
wax

Solution

On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of the non-availability of oxygen. The main reason being that oxygen is needed for burning.
Question 6
1 / -0

What is the best way to extinguish fire, if a person's clothes catch fire?

A
Throw water on the clothes.

B
Use fire extinguisher.

C
Cover the person with a woollen blanket.

D
Cover the person with a polythene sheet.

Solution

If a person's clothes catch fire, the best way to extinguish the fire is to cover the person with a woollen blanket. By covering with a blanket, we are preventing the supply of oxygen, which is a supporter of combustion. Throwing water on them is not a suitable thing if the fire has been caused due to electricity.
Question 7
1 / -0

Which one of the following has the highest calorific value?

A
Kerosene

B
Biogas

C
LPG

D
Petrol

Solution

The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of a fuel is expressed in a unit called kilojoule per kg $$(kJ/kg)$$.
The calorific value of petrol, kerosene, and biogas is below $$50000 kJ/kg$$ but the calorific value of LPG is approximately $$55000 \ kJ/kg$$.
So correct option is $$C$$.
Question 8
1 / -0

Which of the following is not a combustible substance?

A
Camphor

B
Glass

C
Straw

D
Alcohol

Solution

Combustible substance: Substances that burn easily or catch fire easily are called combustible substances.

Paper, clothes, wood, LPG are all combustible substances. Without these substances, a fire cannot be started.

1. Camphor is a waxy, flammable, white or transparent solid with a strong aromatic odour and combustible material.

2. Glass consists mostly of oxides such as silica. Because the elements are in their highest oxidation states, they will not react with oxygen. Thus, glass is not combustible.

3. Alcohol is a hydrocarbon, especially the ones with low molecular mass, are very combustible. They combine with oxygen readily and make carbon dioxide and water. If there is not enough oxygen, they can also make some carbon monoxide.

Hence the correct option is B.
Question 9
1 / -0

Choose the correct statement from the following.

Forest fires are usually due to ______________.

A
Carelessness of humans

B
Heat of sun

C
Cutting of trees

D
Lightning strike
Question 10
1 / -0

Choose the correct statement about inflammable substances from the following statements. They have:

A
low ignition temperature and cannot catch fire easily

B
high ignition temperature and can catch fire easily

C
low ignition temperature and can catch fire easily

D
high ignition temperature and cannot catch fire easily

Solution

Inflammable and flammable both mean combustible. They are substances when exposed to their ignition temperature catch fire easily.

i.e. substances which have low ignition temperature and can catch fire easily.

Hence, option C is correct.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 13

Result

Combustion and Flame Test - 13

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SHARING IS CARING

Question 1

Water shows exothermic reaction with electrical equipment.

Water conduct electricity with electrical equipment's.

Water shows endothermic reaction.

Water is a combustible substance.

Solution

Question 2

Diesel

Coal gas

C.N.G

None of these

Solution

Question 3

2

3

4

5

Solution

Question 4

water

air

soil

land

Solution

Question 5

oxygen

water vapour

carbon dioxide

wax

Solution

Question 6

Throw water on the clothes.

Use fire extinguisher.

Cover the person with a woollen blanket.

Cover the person with a polythene sheet.

Solution

Question 7

Kerosene

Biogas

LPG

Petrol

Solution

Question 8

Camphor

Glass

Straw

Alcohol

Solution

Question 9

Carelessness of humans

Heat of sun

Cutting of trees

Lightning strike

Question 10

low ignition temperature and cannot catch fire easily

high ignition temperature and can catch fire easily

low ignition temperature and can catch fire easily

high ignition temperature and cannot catch fire easily

Solution

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