Combustion and Flame Test

Result

Combustion and Flame Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

The items which can be used to extinguish fire are:

A
air

B
sand

C
blanket

D
Both B and C

Solution

The items which can be used to extinguish fire are sand and blanket. These two can be used to cover a burning object to stop the supply of oxygen and stop the fire. Air on the other hand contains oxygen, which is a supporter of fire. So, that option is not correct.
Question 2
1 / -0

Fire can be extinguished using:

A
carbon dioxide

B
water

C
blanket

D
all of the above

Solution

Depending on the cause of the fire, it can be extinguished using carbon dioxide, blanket and even water.

Carbon dioxide is used if the fire is caused by electrical equipment. Carbon dioxide puts off the fire by acting as a blanket over the material and cutting off the oxygen supply.

A blanket can extinguish fire when it is wrapped around a person whose clothes have caught fire. It cuts off the oxygen supply and puts off the fire.

Water can also extinguish fire by cooling the combustible material so that its temperature is brought below its ignition temperature.
Question 3
1 / -0

If an office building catches fire, then _______________.

A
only the office furniture is the fuel

B
only the gas cylinders in cafeteria is the fuel

C
the whole building is the fuel

D
none of these

Solution

The whole building acts as fuel when the building catches fire. All the substances are combustible and start burning.
Question 4
1 / -0

Which of these is necessary for combustion?

A
Fuel

B
Supply of oxygen

C
Source of ignition

D
All of the above

Solution

We need fuel (combustible substance), oxygen (supporter of combustion) and a source of ignition to initiate the combustion.

Hence, the option D is correct.
Question 5
1 / -0

Which of the following statements is true?

A
Water extinguishes a fire in two ways: (1) It brings the temperature of the combustible material below its ignition temperature. (2) The water vapour formed due to the heat of fire cuts the supply of oxygen.

B
Carbon dioxide is highly volatile. So, it immediately vaporises to cut off the supply of air. In the absence of supporter of combustion, fire is extinguished.

C
Both A and B

D
None of the above

Solution

Water helps to extinguish a fire by cooling the substance that is undergoing combustion and bringing its temperature below its ignition temperature. The water vapor formed due to the heat of fire surrounds the substance that undergoes combustion and cuts the supply of oxygen.

Carbon dioxide is heavier than oxygen. So, it covers the fire like a blanket and cuts off the oxygen supply, thus putting off the fire.
Question 6
1 / -0

If you fix a burning candle on a petri dish, it will continue to burn, but when you put an inverted beaker over it, the flame goes off. Why does this happen?

A
Insufficient nitrogen in the air.

B
The supply of oxygen is cut off.

C
Both A and B

D
None of the above

Solution

If you fix a burning candle on a petri dish, it will continue to burn, but when you put an inverted beaker over it, the flame goes off because the supply of oxygen is cut off. The burning candle uses all the oxygen present inside of the beaker and without oxygen combustion cannot take place.
So, option B is correct.
Question 7
1 / -0

Which of the following is a combustible substance?

A
Wood

B
Charcoal

C
LPG

D
All of the above

Solution

A combustible substance is a substance that can burn with air and produce heat and light. Wood, charcoal, LPG are all combustible substances. Because they contain organic matter in the form of carbon. Which can burn with air to produce heat and light.
Since all are combustible substances. Hence, option $$D$$ is correct.
Question 8
1 / -0

Fire can be controlled by removing which of the following factor?

A
Fuel

B
Air

C
Heat

D
All of the above

Solution

The three essential things required to control fire are fuel, heat and air.
Cutting off the supply of any of these, helps in controlling fire.
Hence, the correct option is $$D$$.
Question 9
1 / -0

Inflammable substances have_______.

A
low ignition temperature.

B
high ignition temperature.

C
moderate ignition temperature.

D
none of the above

Solution

The substances which have a very low ignition temperature and can catch fire easily with a flame are called inflammable substances. It is the ability of a substance to burn or ignite, causing fire or combustion.
For example; LPG, petrol, alcohol, etc.
Question 10
1 / -0

______ is the extinguisher used for inflammable material like petrol.

A
Water

B
$$CO_2$$

C
Oil

D
Dry powder

Solution

Some Class-B fires (hydrocarbons, petroleums, and fuels on fire) cannot be efficiently controlled with water. $$CO_2$$ being heavier than oxygen covers the fire like a blanket. Hence, one of the important factor for fire is cut off and the fire is controlled.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 26

Result

Combustion and Flame Test - 26

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SHARING IS CARING

Question 1

air

sand

blanket

Both B and C

Solution

Question 2

carbon dioxide

water

blanket

all of the above

Solution

Question 3

only the office furniture is the fuel

only the gas cylinders in cafeteria is the fuel

the whole building is the fuel

none of these

Solution

Question 4

Fuel

Supply of oxygen

Source of ignition

All of the above

Solution

Question 5

Water extinguishes a fire in two ways: (1) It brings the temperature of the combustible material below its ignition temperature. (2) The water vapour formed due to the heat of fire cuts the supply of oxygen.

Carbon dioxide is highly volatile. So, it immediately vaporises to cut off the supply of air. In the absence of supporter of combustion, fire is extinguished.

Both A and B

None of the above

Solution

Question 6

Insufficient nitrogen in the air.

The supply of oxygen is cut off.

Both A and B

None of the above

Solution

Question 7

Wood

Charcoal

LPG

All of the above

Solution

Question 8

Fuel

Air

Heat

All of the above

Solution

Question 9

low ignition temperature.

high ignition temperature.

moderate ignition temperature.

none of the above

Solution

Question 10

Water

$$CO_2$$

Oil

Dry powder

Solution

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