Combustion and Flame Test

Result

Combustion and Flame Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

The characteristics of non-combustible substances is/are:

A
They do not ignite

B
They do not support combustion

C
They are not volatile

D
All of the above

Solution

Non-combustible substances are the one which possess all the above qualities.
Question 2
1 / -0

Which type of energy is produced during an explosion?

A
Heat

B
Light

C
Sound

D
All of the above

Solution

An explosion is a sudden reaction during which there is a release of a high amount of heat along with light and sound energy.
Question 3
1 / -0

Why water cannot control fire caused by oil or petrol?

A
Water reacts with oil

B
Water is denser than oil

C
Water is less denser than oil

D
Water mixes with oil

Solution

Water is denser than oil. So it sinks below the oil and oil keeps burning on top and fire cannot be controlled.
Water does not react with the oil and it does not mix with oil.
Hence, option $$B$$ is correct.
Question 4
1 / -0

In combustion, heat is ______________.

A
absorbed

B
released

C
reduced

D
All of the above

Solution

In combustion, heat is $$\text{released}$$.
Combustion reactions are the chemical reactions in which substances react with oxygen. In this process, heat is given off or released.
Question 5
1 / -0

Combustion is a ________________.

A
physical change

B
chemical change

C
Both A and B

D
None of these

Solution

We get a new substance in combustion.

The reaction which gives a new substance is a chemical change.

Hence the correct option is B.
Question 6
1 / -0

What type of materials gives flame?

A
All materials

B
Materials which vaporise on heating

C
Materials which melt on heating

D
None of the above

Solution

The material which vaporizes on burning is capable of producing flame.

Hence the option B is correct.
Question 7
1 / -0

Which of the following is non-combustible?

A
Sand

B
Iron

C
Glass

D
All of the above

Solution

Non-combustible substances are the one which cannot catch fire and burn. All the above materials can not burn.
Question 8
1 / -0

Solid fuels among the following are _____________.

A
coal

B
coke

C
cow dung

D
All

Solution

All the above are fuels and solid in nature. Hence, option $$D$$ is correct.
Question 9
1 / -0

How water controls fire?

A
By suppressing oxygen supply

B
By cooling the burning material

C
By reducing the area over which the fire exists

D
All of the above

Solution

Water cannot suppress the supply of oxygen and cannot reduce the accidental area but cools the fuel and controls the fire.
Hence, option B is correct.
Question 10
1 / -0

A chemical process in which a substance reacts with oxygen to give off heat is called:

A
ignition

B
combustion

C
Both A and B

D
None of the above

Solution

A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substance that undergoes combustion is known as a combustible substance.
The lowest temperature at which a substance catches fire is called its ignition temperature.
So the correct option is $$B$$.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 12

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Combustion and Flame Test - 12

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SHARING IS CARING

Question 1

They do not ignite

They do not support combustion

They are not volatile

All of the above

Solution

Question 2

Heat

Light

Sound

All of the above

Solution

Question 3

Water reacts with oil

Water is denser than oil

Water is less denser than oil

Water mixes with oil

Solution

Question 4

absorbed

released

reduced

All of the above

Solution

Question 5

physical change

chemical change

Both A and B

None of these

Solution

Question 6

All materials

Materials which vaporise on heating

Materials which melt on heating

None of the above

Solution

Question 7

Sand

Iron

Glass

All of the above

Solution

Question 8

coal

coke

cow dung

All

Solution

Question 9

By suppressing oxygen supply

By cooling the burning material

By reducing the area over which the fire exists

All of the above

Solution

Question 10

ignition

combustion

Both A and B

None of the above

Solution

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