Combustion and Flame Test

Result

Combustion and Flame Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to:

A
proper combustion of fuel

B
improper cooking of potato curry

C
improper combustion of the fuel

D
burning of copper vessel

Solution

Copper vessel was getting blackened from outside. It may be due to improper combustion of the fuel.
Question 2
1 / -0

We cannot use a fire extinguisher that involves _____ as an extinguishing substance.

A
carbon dioxide

B
baking soda

C
foam

D
petrol

Solution

We can not use petrol as a fire extinguishing substance, because petrol is a combustible liquid which on combustion produces a lot of heat energy. So petrol is not used to stop the fire.
Question 3
1 / -0

Coke is a _______ fuel.

A
harmless

B
renewable

C
smokeless

D
None of these

Solution

Coke is widely used as a fuel in coal-based industries due to its high calorific value. It releases less amount of smoke after burning.
Question 4
1 / -0

Oxygen is a _____ gas.

A
non-combustible

B
combustible

C
monoatomic

D
coloured

Solution

Oxygen does not burn. It is not flammable, but it is an oxidizer. Oxygen helps the fire burn more quickly. Therefore, we can say that oxygen is a non-combustible gas.
Question 5
1 / -0

Unburnt carbon particles are present in the:

A
Blue zone

B
Dark inner zone

C
Luminous zone

D
Non-luminous zone

Solution

The circular dark ring is formed on the slide is due to the deposition of unburnt carbon particles present (middle) in the luminous zone of the candle.

Option C is correct.
Question 6
1 / -0

What kind of combustion is undergone by ignition of a cracker?

A
Explosive combustion

B
Spontaneous combustion

C
Rapid combustion

D
Slow combustion

Solution

Ignition of a cracker is explosive combustion. This type of combustion occurs at an extremely rapid pace. When a force is used to ignite the fuel, heat, light, and sound are produced instantly.

Option A is correct.
Question 7
1 / -0

Which among the following is considered as the cleanest fuel?

A
Cow dung cake

B
Petrol

C
Kerosene

D
Hydrogen gas

Solution

Hydrogen gas is considered the cleanest fuel because it produces nothing but water vapour when hydrogen burns in the air.
Question 8
1 / -0

Which of the following is not required for combustion to take place?

A
Fuel

B
Carbon dioxide

C
Oxygen

D
Source of heat

Solution

Conditions under which combustion can take place are as follows:
(a) Presence of oxygen.
(b) Presence of an inflammable substance known as fuel.
(c) Source of heat to reach the Ignition temperature.

Carbon dioxide is not a supporter of combustion(burning). Hence, for combustion to take place, Carbon dioxide is not required.
Question 9
1 / -0

During combustion of gaseous fuels, deficiency of air ___________.

A
Lengthens the flame.

B
Tends to shorten the flame.

C
Does not affect the flame length.

D
Increases the flame temperature.

Solution

During combustion of gaseous fuels, deficiency of air lengthens the flame. When combustion is carried out in limited supply of air, the combustion is incomplete. The products of combustion remain unburnt and contaminate the smoke with particulate matter. Hence, the length of the flame increases.
Question 10
1 / -0

Higher efficiency in the combustion of solid fuel cannot be achieved by __________.

A
Supplying correct quantity of combustion air

B
Keeping the flue gas exhaust temperature very high

C
Proper fuel preparation

D
Adopting efficient fuel firing techniques and equipments

Solution

Higher efficiency in the combustion of solid fuel cannot be achieved by keeping the flue gas exhaust temperature very high because when flue gas temperature is high, then there is less heat transfer under the medium.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 15

Result

Combustion and Flame Test - 15

Score

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Rank

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SHARING IS CARING

Question 1

proper combustion of fuel

improper cooking of potato curry

improper combustion of the fuel

burning of copper vessel

Solution

Question 2

carbon dioxide

baking soda

foam

petrol

Solution

Question 3

harmless

renewable

smokeless

None of these

Solution

Question 4

non-combustible

combustible

monoatomic

coloured

Solution

Question 5

Blue zone

Dark inner zone

Luminous zone

Non-luminous zone

Solution

Question 6

Explosive combustion

Spontaneous combustion

Rapid combustion

Slow combustion

Solution

Question 7

Cow dung cake

Petrol

Kerosene

Hydrogen gas

Solution

Question 8

Fuel

Carbon dioxide

Oxygen

Source of heat

Solution

Question 9

Lengthens the flame.

Tends to shorten the flame.

Does not affect the flame length.

Increases the flame temperature.

Solution

Question 10

Supplying correct quantity of combustion air

Keeping the flue gas exhaust temperature very high

Proper fuel preparation

Adopting efficient fuel firing techniques and equipments

Solution

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