Combustion and Flame Test

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Combustion and Flame Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Fuel efficiency depends on:

A
properties of fuel

B
amount of oxygen available

C
Both A and B

D
None of the above

Solution

Fuel efficiency depends on the calorific value of the fuel. Also, the amount of oxygen available affects how well the fuel burns. Less amount of oxygen will result in incomplete combustion and thus, will cause low fuel efficiency.
Question 2
1 / -0

Which of the following materials does not undergo rapid combustion?

A
Wood

B
Petrol

C
Paper

D
Matchstick

Solution

Rapid combustion is the process in which a substance burns rapidly and produces heat and light. Petrol, paper and matchstick burn rapidly and so, undergo rapid combustion. However, wood's ignition temperature is very high and so, it burns slowly.

Hence, the option A is correct.
Question 3
1 / -0

Which of the following parameters can be used to control fire?

A
Cutting off the oxygen supply

B
Suppressing the fuel supply

C
Reducing the area over which the fire exists

D
All of the above

Solution

A substance burns only in the presence of oxygen. So, cutting off the oxygen supply can stop the fire. Also, if the fuel supply is suppressed, the fire can not continue burning at the same rate. Additionally, reducing the accidental area makes the combustion less violent.
So, option D is correct.
Question 4
1 / -0

Colour of the flame is dependent on the ______________.

A
Supply of oxygen

B
Nature of fuel

C
Ignition temperature of the fuel

D
All of the above

Solution

The color and temperature of a flame are dependent on the nature of the fuel involved in the combustion.
When excited, every element can emit light at a specific wavelength, hence the color of the emitted light is characteristic of each element. An example of this is the blue flame from gas ovens, which is due to the combustion of methane or liquified petroleum gas.
Question 5
1 / -0

The form of combustion where a material suddenly undergoes combustion under normal conditions is known as:

A
fast combustion

B
spontaneous combustion

C
slow combustion

D
non-spontaneous combustion

Solution

A type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is known as spontaneous combustion.

For some materials, ignition temperature is lower than the room temperature and hence, they readily catch fire even at room temperatures. Phosphorus is an example of such a material.

Hence, the form of combustion where material undergoes combustion at room temperature that is under normal conditions is known as 'Spontaneous Combustion'.

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

When clothes of a person catch fire, his body is covered with a blanket to __________.

A
stop the supply of oxygen.

B
make him feel comfortable.

C
save him from any injury.

D
hold his body properly.

Solution

When the clothes of a person catch fire, his body is covered with a blanket to stop the supply of oxygen. Air (oxygen) is essential for combustion. In the absence of oxygen from the air, combustion will not occur. Hence, the fire will be extinguished.
Hence, option $$A$$ is correct.
Question 7
1 / -0

Which of the following is necessary for combustion?

A
Oxygen

B
Water

C
Light

D
Carbon Dioxide

Solution

Oxygen is the necessary constituent for any combustion reaction, as it is a supporter of combustion and cutting the supply of oxygen will stop the combustion immediately.
Question 8
1 / -0

The substance which undergoes combustion is called ________.

A
fuel

B
non-inflammable

C
combustible

D
Both $$A$$ & $$C$$

Solution

The substance that undergoes combustion is said to be combustible. It is also called fuel. During combustion, a chemical change occurs. The substance reacts with oxygen and releases heat. Hence, the substance acts as fuel. A combustible substance is one that readily undergoes combustion.
Question 9
1 / -0

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

A
Ignition

B
Combustion

C
Conduction

D
None of the above

Solution

A chemical process in which a substance reacts with oxygen to give off heat is called combustion.
Question 10
1 / -0

A candle is burning in the can. After some time, the candle is covered with glass. The flame of the candle:

A
brightens

B
becomes low and gets extinguished

C
No effect

D
Depends on the type of glass

Solution

When the candle is covered with glass, it cut off the supply of air and the intensity of the flame becomes low and gets extinguished.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 25

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Combustion and Flame Test - 25

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SHARING IS CARING

Question 1

properties of fuel

amount of oxygen available

Both A and B

None of the above

Solution

Question 2

Wood

Petrol

Paper

Matchstick

Solution

Question 3

Cutting off the oxygen supply

Suppressing the fuel supply

Reducing the area over which the fire exists

All of the above

Solution

Question 4

Supply of oxygen

Nature of fuel

Ignition temperature of the fuel

All of the above

Solution

Question 5

fast combustion

spontaneous combustion

slow combustion

non-spontaneous combustion

Solution

Question 6

stop the supply of oxygen.

make him feel comfortable.

save him from any injury.

hold his body properly.

Solution

Question 7

Oxygen

Water

Light

Carbon Dioxide

Solution

Question 8

fuel

non-inflammable

combustible

Both $$A$$ & $$C$$

Solution

Question 9

Ignition

Combustion

Conduction

None of the above

Solution

Question 10

brightens

becomes low and gets extinguished

No effect

Depends on the type of glass

Solution

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