Combustion and Flame Test

Result

Combustion and Flame Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following gases is responsible for global warming?

A
Carbon monoxide

B
Carbon dioxide

C
Nitrogen

D
Ozone

Solution

Carbon dioxide is a product of combustion of various fuels. An increased concentration of carbon dioxide in the atmosphere is said to be the reason for global warming. Carbon dioxide traps heat and this trapped heat increases the average temperature of the Earth, thereby causing global warming.

The correct answer is B.

Question 2

1 / -0

Use the following information to answer the next question.

The given table lists the ignition temperatures of four fuels W, X, Y, and Z respectively.
Fuel	Ignition temperature
W	38^oC
X	42^oC
Y	53^oC
Z	54^oC

At 50^oC, which of the given fuels is likely to undergo combustion?

Y and Z

X and Y

W and X

Z and W

Solution

The ignition temperature of a substance is the lowest temperature at which that substance starts burning. Both fuels, W and X, have their ignition temperatures below 50^oC. Hence, they will attain their ignition temperatures and undergo combustion.

The correct answer is C

Question 3
1 / -0

Which of the following substances is not required for combustion?

A
O₂

B
CO₂

C
Fuel

D
Heat

Solution

Carbon dioxide (CO₂) is not required for combustion. Rather, it is used as a fire extinguisher. Since carbon dioxide is heavier than oxygen, it covers the fire like a blanket and cuts off the contact between the fuel and oxygen, thereby dousing the fire.

The correct answer is B.

Question 4

1 / -0

Use the following information to answer the next question.

The given table lists some substances as per their burning tendencies.
Produce a flame	Do not produce a flame
Molten wax	Kerosene oil
Camphor	Charcoal

Which of the following substances is incorrectly categorized?

Charcoal

Camphor

Kerosene oil

Molten wax

Solution

Substances that vaporize give a flame. Kerosene oil undergoes the process of burning along with the production of flame.

The correct answer is C.

Question 5

1 / -0

Use the following information to answer the next question.

The given table lists some fuels with their calorific values.
Fuel	Calorific value
Diesel	45000
LPG	55000
Petrol	45000
CNG	50000

Which of the given fuels is the most efficient?

Petrol

Diesel

LPG

CNG

Solution

Calorific value is the amount of heat produced on complete combustion of one kg of fuel. The higher the value, the greater is the efficiency of the fuel. Among the given fuels, LPG has a maximum calorific value. Hence, it is the most efficient.

The correct answer is C.

Question 6
1 / -0

Theunit of calorific value of a fuel is

A
°C

B
L

C
m/s

D
kJ/kg

Solution

Calorific value is the heat energy produced by the complete combustion of one kg of fuel. Its unit is kJ/kg.

The correct answer is D.

Question 7

1 / -0

Which of the following tablescorrectly matches the given zones of a candle flame with their respective characteristics?

Zone Characteristic

i Innermost Least hot and black

ii Luminous Moderately hot and yellow

Zone Characteristic

i Outermost Hottest and black

ii Luminous Least hot and blue

Zone Characteristic

i Non-luminous Least hot and blue

ii Innermost Hottest and black

Zone Characteristic

i Non-luminous Moderately hot and yellow

ii Outermost Least hot and black

Solution

The outermost zone of a candle flame is the hottest zone and is blue in colour. It is a non-luminous zone.

The middle zone of a candle flame is moderately hot and yellow in colour. It is the luminous zone of a candle flame.

The innermost zone contains unburnt carbon particles, which gives it a black colour. It is the least hot zone of a candle flame.

The correct answer is A.

Question 8
1 / -0

What is a major cause of global warming?

A
Gaseous nitrogen oxides released by petrol engines

B
Oxides of sulphur and nitrogen dissolved in rain water

C
Emission of sulphur dioxide on combustion of coal

D
Release of carbon dioxide on combustion of fuels

Solution

On combustion, almost every fuel releases carbon dioxide in the environment. The increased concentration of carbon dioxide is believed to capture the reflected sun rays, thereby increasing the temperature of the Earth. Hence, it leads to global warming.

The correct answer is D.
Question 9
1 / -0

Which of the following substances is non-combustible?

A
Wood

B
Biogas

C
Kerosene oil

D
A piece of stone

Solution

A piece of stone is non-combustible. A substance is defined as non-combustible if it does not react with oxygen to produce heat. A piece of stone does not react with oxygen.

The correct answer is D.
Question 10
1 / -0

Which of the following statements is correct?

A
Liquefied Petroleum gas is a better domestic fuel than wood.

B
Fire produced by kerosene oil can be controlled using water.

C
A fuel can be heated to any temperature before it starts burning.

D
Water is used to control fires involving electrical equipments.

Solution

Liquefied Petroleum Gas is a more efficient fuel than wood owing to its high calorific value of 55000 KJ/kg (calorific value of wood is 20000KJ/kg). Also, it is environment friendly. Hence, it is preferred over wood.

The correct answer is A.

Question 11

1 / -0

Use the following information to answer the next question.

The head of a matchstick contains a mixture of antimony trisulphide, potassium chlorate, starch, and some glue. For combustion, it is struck against a rough surface made of powdered glass and red phosphorus.

Which of the following substances will be the first to get ignited when the match is struck against a rough surface?

Antimony trisulphide

Potassium chlorate

Red phosphorus

Powdered glass

Solution

When a match is struck against a rough surface, red phosphorus attains its ignition temperature through the heat of friction and gets converted into white phosphorous, which immediately reacts with potassium chlorate and antimony trisulphide to start combustion.

The correct answer is C.

Question 12
1 / -0

Use the following information to answer the next question.

A piece of paper wrapped around an aluminium pipe does not catch fire easily.

Which of the following reasons supports the above information?

A
Paper is non-combustible in nature

B
Aluminium is non-combustible in nature

C
Aluminium pipe does not attain its ignition temperature

D
Paper wrapped around the pipe does not attain its ignition temperature

Solution

Both aluminium and paper are combustible substances. When heat is supplied to the paper, it is transferred to the aluminium pipe by conduction. In the presence of aluminium, the ignition temperature of paper is not achieved. Therefore, it does not catch fire easily. It is important to note that attaining the ignition temperature is a prerequisite for combustion to take place.

The correct answer is D.
Question 13
1 / -0

Which of the following fuels is the most efficient?

A
Coal

B
Wood

C
Biogas

D
Charcoal

Solution

Fuel efficiency is measured in terms of its calorific value. Calorific value is defined as the amount of heat energy produced on complete combustion of 1 kg of fuel. Amongst the above mentioned fuels, biogas has a maximum calorific value of 35000 − 40000 kJ/kg. Hence, it is the most efficient among the given fuels.

The correct answer is C.
Question 14
1 / -0

Which of the following is not a characteristic of a good fuel?

A
It should be cheap and readily available

B
It should have a high calorific value

C
It should be environment friendly

D
It should burn at a slow rate in air

Solution

A good fuel is the one that neither burns at a very fast rate nor burns at a very slow rate. It should burn at a moderate rate in air.

The correct answer is D.
Question 15
1 / -0

Use the following information to answer the next question.

The calorific value of a fuel is 330000 kJ/kg. 0.9634 kg of the fuel is taken for combustion.

The total amount of heat energy (in kJ) produced during combustion is

A
317922

B
215677

C
3179.22

D
317.922

Solution

Calorific value of a fuel is the amount of heat produced when 1 kg of that fuel undergoes complete combustion.

Calorific value = 330000 kJ/kg (given)

i.e., 1 kg of fuel on complete combustion produces 330000 kJ of heat

Hence, the amount of heat energy produced by the combustion of 0.9634 kg of fuel

= 330000 × 0.9634 kJ = 317922 kJ

The correct answer is A.

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	Zone	Characteristic
i	Innermost	Least hot and black
ii	Luminous	Moderately hot and yellow

	Zone	Characteristic
i	Outermost	Hottest and black
ii	Luminous	Least hot and blue

	Zone	Characteristic
i	Non-luminous	Least hot and blue
ii	Innermost	Hottest and black

Combustion and Flame Test - 9

Result

Combustion and Flame Test - 9

Score

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Rank

-

SHARING IS CARING

Question 1

Carbon monoxide

Carbon dioxide

Nitrogen

Ozone

Solution

Question 2

Y and Z

X and Y

W and X

Z and W

Solution

Question 3

O2

CO2

Fuel

Heat

Solution

Question 4

Charcoal

Camphor

Kerosene oil

Molten wax

Solution

Question 5

Petrol

Diesel

LPG

CNG

Solution

Question 6

°C

L

m/s

kJ/kg

Solution

Question 7

Zone Characteristic i Innermost Least hot and black ii Luminous Moderately hot and yellow

Zone Characteristic i Outermost Hottest and black ii Luminous Least hot and blue

Zone Characteristic i Non-luminous Least hot and blue ii Innermost Hottest and black

Zone Characteristic i Non-luminous Moderately hot and yellow ii Outermost Least hot and black

Solution

Question 8

Gaseous nitrogen oxides released by petrol engines

Oxides of sulphur and nitrogen dissolved in rain water

Emission of sulphur dioxide on combustion of coal

Release of carbon dioxide on combustion of fuels

Solution

Question 9

Wood

Biogas

Kerosene oil

A piece of stone

Solution

Question 10

Liquefied Petroleum gas is a better domestic fuel than wood.

Fire produced by kerosene oil can be controlled using water.

A fuel can be heated to any temperature before it starts burning.

Water is used to control fires involving electrical equipments.

Solution

Question 11

Antimony trisulphide

Potassium chlorate

Red phosphorus

Powdered glass

Solution

Question 12

Paper is non-combustible in nature

Aluminium is non-combustible in nature

Aluminium pipe does not attain its ignition temperature

Paper wrapped around the pipe does not attain its ignition temperature

Solution

O₂

CO₂

Zone Characteristic

i Innermost Least hot and black

ii Luminous Moderately hot and yellow

Zone Characteristic

i Outermost Hottest and black

ii Luminous Least hot and blue

Zone Characteristic

i Non-luminous Least hot and blue

ii Innermost Hottest and black

Zone Characteristic

i Non-luminous Moderately hot and yellow

ii Outermost Least hot and black