Combustion and Flame Test

Result

Combustion and Flame Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Which is the hottest part in the flame of the candle?

A
Blue

B
Yellow

C
Black

D
Wax part

Solution

The hottest part of a candle flame are actually the blue, almost invisible area near the base. Where oxygen is drawn in and blue or white part around the edge. In this area flame meets the oxygen-rich air all around it. The flame get progressively cooler as you move in from the outside edge toward the wick.
Question 2
1 / -0

By undergoing what process, chemical fuel releases its energy?

A
Reduction

B
Oxidation

C
Electrolysis

D
decomposition

Solution

Chemical fuels react with oxygen (combustion) and releases their energy. Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.
Question 3
1 / -0

Why is CNG a cleaner fuel?

A
No particulate emission

B
Releases very less amounts of sulphur and nitrogen oxides

C
No emission of ash

D
All of the above

Solution

C.N.G (compressed natural gas) is a cleaner fuel because it causes less pollution by emitting fewer pollutants like carbon dioxide, carbon monoxide, sulphur dioxide, nitrogen dioxide, particulate matter, unburned hydrocarbons etc.
Question 4
1 / -0

Rapid combustion is:

A
when gas burns, it produces heat and light.

B
when material suddenly burst into flames.

C
when there is evolution of heat.

D
none of these.

Solution

Combustion in which a substance burns rapidly and produces heat and flame is known as rapid combustion. Example: combustion of LPG gas, petrol, etc. Substances which undergo rapid combustion have lower ignition temperature.
Question 5
1 / -0

In combustion, the substance reacts with ___________.

A
hydrogen

B
oxygen

C
nitrogen

D
carbon dioxide

Solution

Combustion is an exothermic reaction between fuel and oxidant usually atmospheric oxygen.
Question 6
1 / -0

The hottest part of a candle flame is the __________.

A
luminous zone

B
dark zone

C
hot zone

D
non-luminous zone

Solution

The Non-Luminous zone is the region of the complete combustion. If you look at a candle flame closely. You will see an "aura" formed around the candle. Since this zone is complete combustion and it is the hottest part of the flame.
Question 7
1 / -0

What is ignition temperature of a fuel?

A
Very high temperature

B
The ignition temperature of a fuel is the lowest temperature at which the vapour of that fuel will continue to burn

C
Very low temperature

D
none of these

Solution

The fire point of a fuel is the lowest temperature at which the vapor of that fuel will continue to burn for at least five seconds after ignition by an open flame of standard dimension.
Question 8
1 / -0

It is difficult to burn a heap of green leaves because ____________.

A
the green colour prevents them from burning

B
of the thick material from which they are made

C
the size of the heap is too large

D
they contain a great amount of moisture which makes the ignition temperature high

Solution

The heap of green leaves has a great amount of moisture content which makes the ignition temperature high. Hence it is difficult to burn green leaves.
So, the correct option is $$D$$
Question 9
1 / -0

Burning which of the following fuels causes relatively lesser damage to the environment in comparison to others?

A
Diesel

B
Petrol

C
C.N.G

D
Cow dung

Solution

On combustion, C.N.G releases a very less amount of sulphur and nitrogen oxides, compared to all other fuels, without any particulate emission.
Question 10
1 / -0

Non-combustible gas among the following is _______________.

A
hydrogen

B
oxygen

C
L.P.G

D
natural gas

Solution

Oxygen is non-combustible gas. It only supports the process of combustion.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 23

Result

Combustion and Flame Test - 23

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SHARING IS CARING

Question 1

Blue

Yellow

Black

Wax part

Solution

Question 2

Reduction

Oxidation

Electrolysis

decomposition

Solution

Question 3

No particulate emission

Releases very less amounts of sulphur and nitrogen oxides

No emission of ash

All of the above

Solution

Question 4

when gas burns, it produces heat and light.

when material suddenly burst into flames.

when there is evolution of heat.

none of these.

Solution

Question 5

hydrogen

oxygen

nitrogen

carbon dioxide

Solution

Question 6

luminous zone

dark zone

hot zone

non-luminous zone

Solution

Question 7

Very high temperature

The ignition temperature of a fuel is the lowest temperature at which the vapour of that fuel will continue to burn

Very low temperature

none of these

Solution

Question 8

the green colour prevents them from burning

of the thick material from which they are made

the size of the heap is too large

they contain a great amount of moisture which makes the ignition temperature high

Solution

Question 9

Diesel

Petrol

C.N.G

Cow dung

Solution

Question 10

hydrogen

oxygen

L.P.G

natural gas

Solution

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