Combustion And Fuel Test

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Combustion And Fuel Test - 5

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Weekly Quiz Competition

Question 1
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Directions: Read the statements given below and select the correct option.

Statement 1: Combustion is a chemical process in which a substance reacts with oxygen to give out heat and light.
Statement 2: Heat and light are produced in the sun due to combustion.

A
Both statements are true and statement 2 is the correct explanation of statement 1.

B
Both statements are true, but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true and statement 2 is false.

D
Both statements are false.

Solution

Statement 2 is false because nuclear reactions are responsible for the heat and light produced in the sun.
Question 2
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Which of the following options correctly defines calorific value of a fuel?

A
Heat energy liberated by complete combustion of 1 g of fuel

B
Heat energy liberated by complete combustion of 1 kg of fuel

C
1 kJ of energy liberated by complete combustion of any amount of fuel

D
None of these

Solution

The amount of heat produced by the complete combustion of a material or a fuel is called its calorific value.
It is measured in units of energy per amount of material, e.g. kJ/kg.
Question 3
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What are the most suitable temperature and pressure conditions for the formation of petroleum?

A
High temperature and low pressure

B
High pressure and low temperature

C
High temperature and high pressure

D
Low temperature and low pressure

Solution

The most suitable temperature and pressure conditions for the formation of petroleum is high temperature and high pressure.
Question 4
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Which of the following is a fossil fuel?

A
Nuclear energy

B
Wind

C
Solar energy

D
Natural gas

E
Geothermal energy

Solution

Natural gas and petroleum are formed from the dead remains of marine plants and animals under geothermal conditions of high temperature and pressure.
Hence, it is a fossil fuel.
Question 5
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Which of the following are used these days to make the head of a matchstick?

a. Antimony trisulphide
b. Potassium chlorate
c. Red phosphorus
d. White phosphorus

A
Only a and b

B
Only b and c

C
Only a and c

D
Only b and d

E
Only a and d

Solution

Antimony trisulphide and potassium chlorate are used these days to make the head of a matchstick.
Red phosphorus is coated on the rubbing surface that is on the side of a matchbox.
White phosphorus is not used these days because it may undergo spontaneous combustion and hence, its use is not safe.
Question 6
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Which instrument is fitted in automobiles to reduce the harmful emissions from its exhaust?

A
Catalytic converter

B
Biogas plant

C
Electrostatic precipitator

D
Sedimentation

E
Scrubber

Solution

Catalytic converter is fitted in automobiles to reduce the harmful emissions from its exhaust.
This instrument has a catalyst, which can convert carbon monoxide into carbon dioxide and oxides of nitrogen into gaseous nitrogen. This is a pollution control measure.
Question 7
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Which of the following, when buried under the earth for a long period, give(s) rise to petroleum?

A
Forests

B
Aquatic organisms

C
Wildlife

D
Microorganism

Solution

Petroleum is formed from the organisms living in the sea. When they die, their bodies settle at the bottom of the sea and get covered with layers of sand and clay. Over a period of time, they get converted into petroleum.
Question 8
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Liquefied petroleum gas consists mainly of

A
methane

B
carbon monoxide

C
butane

D
nitrogen

E
hydrogen

Solution

This is the correct option. Liquefied petroleum gas consists mainly of butane.
Question 9
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Which of the following pairs is incorrectly matched?

A
Wildlife - Inexhaustible

B
Coal - Exhaustible

C
Sunlight - Exhaustible

D
Wind - Inexhaustible

E
Petroleum - Exhaustible

Solution

Inexhaustible resources are those which are present in unlimited quantity in nature or are renewed by natural cycles and are not likely to be exhausted by human activities, e.g. wildlife, sun and wind.
Exhaustible resources are those which are present in a limited quantity in nature and are not renewed through quick natural cycles, e.g. fossil fuels (coal and petroleum).
Sunlight is abundant in nature and cannot be destroyed by human activities. Hence, it is an inexhaustible resource.
Question 10
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Observe the image given below and answer the question that follows.

Which of the following in an incorrect statement?

A
The orange colour of the middle zone is on account of complete combustion of the fuel.

B
The outermost zone is the hottest part of the flame.

C
The wick turns black due to deposition of unburnt carbon particles.

D
The flame is the burning vapour of paraffin wax.

Solution

Complete combustion takes place in the outermost part of the flame due to the availability of oxygen, which is the reason that this is the hottest part of the flame.
Partial combustion takes place in the middle zone, because the supply of oxygen is inadequate; hence, a yellowish orange luminous flame is produced.
Therefore, option (1) is incorrect.
Question 11
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Analyse the two statements given below and select the correct option.

Statement I: Fuel are energy reserves and this energy is released by the process of combustion.
Statement II: Combustion is the process of burning the substance in the presence of a sufficient quantity of oxygen.

A
Both statements I and II are correct and statement II is the correct reason for I.

B
Both statements I and II are correct, but statement II is not the correct reason for I.

C
Statement I is correct, but statement II is incorrect.

D
Both statements I and II are incorrect.

Solution

Both statements I and II are correct, but statement II is not the correct reason for I.
The correct reason for statement I is that combustion is an exothermic process.
Question 12
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Observe the activity in the image below and answer the question that follows.

Which of the following statements are incorrect?

I. Burning of the magnesium ribbon is a combustion reaction.
II. Magnesium combines with oxygen.
III. The reaction is exothermic.
IV. The ribbon is held in the flame to initiate the reaction.

A
I and IV

B
II and III

C
All the statements are correct.

D
All the statements are incorrect.

Solution

All the given statements about the burning of the magnesium ribbon in air are correct.
The reaction that occurs is:

The reaction is highly exothermic, but the ribbon is heated initially to provide the ignition temperature for the reaction to occur.
Question 13
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Which of the following is not a constituent of petroleum?

A
Coke

B
Diesel

C
Paraffin

D
Kerosene

Solution

Coke is formed by the destructive distillation of coal and is not a component of petroleum.
Question 14
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Observe the given flow chart and the statements that follow.

I. W and X are the components of water gas.
II. W, X and Y are the components of coal gas.
III. W is a rocket fuel.
IV. Z is a domestic fuel.

Which of the following options is the correct identification of W, X, Y and Z?

A
W - Hydrogen; X - Carbon monoxide; Y - Methane; Z - L.P.G.

B
W - Hydrogen; X - Methane; Y - Carbon monoxide; Z - L.P.G.

C
W - Carbon monoxide; X - Hydrogen; Y - Methane; Z - L.P.G.

D
W - L.P.G; X - Carbon monoxide; Y - Methane; Z - Hydrogen

Solution

W - Hydrogen; X - Carbon monoxide; Y - Methane; Z - L.P.G.
This is the correct identification of the combustible substances W, X, Y and Z.
W is hydrogen (rocket fuel); hence, X is the other component of water gas and is carbon monoxide.
Y will be the third component of coal gas which is methane.
Z is L.P.G, which is used as a domestic fuel.
Question 15
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Which of the following options regarding burning of coal is correct?

A
It burns with a flame.

B
It vaporises on heating.

C
It smoulders when hot.

D
It leaves no residue on burning.

Solution

Coal is a solid fuel and it does not vaporise on heating. Hence, it does not burn with a flame, but smoulders on heating.
The initial flame formed is due to the trapped impurities.
Moreover, coal on burning produces solid ash.

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Combustion And Fuel Test - 5

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Combustion And Fuel Test - 5

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Question 1

Both statements are true and statement 2 is the correct explanation of statement 1.

Both statements are true, but statement 2 is not the correct explanation of statement 1.

Statement 1 is true and statement 2 is false.

Both statements are false.

Solution

Question 2

Heat energy liberated by complete combustion of 1 g of fuel

Heat energy liberated by complete combustion of 1 kg of fuel

1 kJ of energy liberated by complete combustion of any amount of fuel

None of these

Solution

Question 3

High temperature and low pressure

High pressure and low temperature

High temperature and high pressure

Low temperature and low pressure

Solution

Question 4

Nuclear energy

Wind

Solar energy

Natural gas

Geothermal energy

Solution

Question 5

Only a and b

Only b and c

Only a and c

Only b and d

Only a and d

Solution

Question 6

Catalytic converter

Biogas plant

Electrostatic precipitator

Sedimentation

Scrubber

Solution

Question 7

Forests

Aquatic organisms

Wildlife

Microorganism

Solution

Question 8

methane

carbon monoxide

butane

nitrogen

hydrogen

Solution

Question 9

Wildlife - Inexhaustible

Coal - Exhaustible

Sunlight - Exhaustible

Wind - Inexhaustible

Petroleum - Exhaustible

Solution

Question 10

The orange colour of the middle zone is on account of complete combustion of the fuel.

The outermost zone is the hottest part of the flame.

The wick turns black due to deposition of unburnt carbon particles.

The flame is the burning vapour of paraffin wax.

Solution

Question 11

Both statements I and II are correct and statement II is the correct reason for I.

Both statements I and II are correct, but statement II is not the correct reason for I.

Statement I is correct, but statement II is incorrect.

Both statements I and II are incorrect.

Solution

Question 12