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question_answer1)
What are the two main hydrocarbons present in L.P.G.?
A)
Butane + propane done
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B)
Butane + isobutene done
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C)
Propane + ethane done
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D)
Methane + ethane done
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question_answer2)
What is the heat produced by burning 1 g of fuel completely known as?
A)
Heat capacity done
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B)
Calorific value done
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C)
Vapour density done
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D)
Boiling point done
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question_answer3)
Which of the following has the highest calorific value?
A)
Petrol done
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B)
Coke done
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C)
Natural gas done
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D)
Kerosene done
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question_answer4)
Which of the following has the characteristics of a good fuel?
A)
Coke done
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B)
Butane done
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C)
Coal done
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D)
Kerosene done
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question_answer5)
What is burning of a substance in the presence of air with the evolution of heat called?
A)
Distillation done
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B)
Carbonization done
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C)
Combustion done
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D)
Refining done
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question_answer6)
When methane burns in air, what are the products formed?
A)
\[C{{O}_{2}}+2{{H}_{2}}O+heat\] done
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B)
\[C{{O}_{2}}+{{H}_{2}}\] done
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C)
\[CO+{{O}_{2}}\] done
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D)
\[C{{O}_{2}}+{{O}_{2}}+heat\] done
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question_answer7)
What kind of reaction is combustion?
A)
Reduction done
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B)
Redox done
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C)
Substitution done
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D)
Oxidation done
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question_answer8)
Which of the following is a non- combustible substance?
A)
Coke done
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B)
Diamond done
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C)
Coal done
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D)
Wood done
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question_answer9)
What is the lowest temperature at which a substance starts burning called?
A)
Minimum temperature done
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B)
Maximum temperature done
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C)
Boiling temperature done
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D)
Ignition temperature done
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question_answer10)
If the temperature falls below its ignition temperature, then what happens to the burning substance?
A)
It gets extinguished. done
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B)
It burns brightly. done
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C)
It burns dimly. done
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D)
It burns with smoke. done
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question_answer11)
Which of the following is an example of rapid combustion?
A)
Candle done
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B)
Cracker done
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C)
White phosphorus done
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D)
Sulphur done
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question_answer12)
In which of the following types of combustion are heat, light and sound produced?
A)
Rapid done
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B)
Explosive done
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C)
Spontaneous done
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D)
All of the above done
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question_answer13)
I Match the entries in Column-l with those in Column-ll correctly.
| Column - I | | Column - II |
(a) | Dark inner zone | (i) | Hottest part (No carbon) |
(b) | Blue zone | (ii) | Partial combustion |
(c) | Luminous zone | (iii) | Unburnt vapours of wax |
(d) | Non-luminous zone | (iv) | Complete combustion |
A)
a-1, b-2, c-3, d-4 done
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B)
a-2, b-3, c-4, d-1 done
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C)
a-3, b-4, c-2, d-1 done
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D)
a-4, b-1, c-2, d-3 done
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question_answer14)
What does the blue zone in an L.P.G. flame indicate?
A)
Unburnt vapours done
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B)
Partial decomposition done
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C)
Moderately hot done
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D)
Hottest zone of complete combustion done
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question_answer15)
What does natural gas contain?
A)
Methane, ethane, propane. done
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B)
Butane, propane and ethane. done
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C)
Pentene, methane and ethylene. done
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D)
Hexane, butane and ethane. done
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question_answer16)
How is synthetic petrol produced?
A)
From petroleum done
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B)
From wood done
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C)
From coal done
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D)
From L.P.G. done
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question_answer17)
Arrange the following fuels in the increasing order of their calorific value.
(i) Petrol |
(ii) Wood |
(ii) Coal |
(iv) Natural gas |
A)
(i), (ii), (iii), (iv) done
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B)
(ii), (iii), (iv) and (i) done
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C)
(ii), (i), (iii) and (iv) done
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D)
(ii), (iii), (i) and (iv) done
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question_answer18)
What does the incomplete combustion of a fuel give?
A)
CO done
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B)
\[C{{O}_{2}}\] done
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C)
\[S{{O}_{2}}\] done
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D)
Oxides of nitrogen done
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question_answer19)
The total amount of heat produced by a fuel having a calorific value of 20 kJ kg 1 was found to be 50,000 joules. How much fuel was burnt?
A)
2500 kg done
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B)
250 kg done
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C)
25 kg done
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D)
2.5 kg done
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question_answer20)
What is combustion?
A)
An exothermic reaction done
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B)
An endothermic reaction done
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C)
A displacement reaction done
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D)
A reduction reaction done
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question_answer21)
Inspite of the danger involved with hydrogen, it is used for some applications. Where is it used?
A)
Rocket fuel done
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B)
Oxyhydrogen flame done
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C)
Car fuel done
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D)
All of the above done
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question_answer22)
A family consumes 12 kg of L.P.G. in 30 days. Calculate the average energy consumed per day, if the calorific value of L.P.G. is 50 kJ kg1.
A)
10,000 J per day done
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B)
15,000 J per day done
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C)
20,000 J per day done
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D)
25,000 J per day done
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question_answer23)
What ignition temperature does an inflammable substance have?
A)
More than 100°C done
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B)
Less than 100°C done
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C)
More than 200 °C done
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D)
Between 200 °C to 350 °C done
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question_answer24)
What is the disadvantage of incomplete combustion of a fuel?
A)
Unburnt carbon gets released. done
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B)
Air gets polluted. done
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C)
Respiratory problems arise. done
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D)
All of the above done
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question_answer25)
Which of the following is the best extinguisher for inflammable materials?
A)
Water done
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B)
Sulphur dioxide done
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C)
Carbon dioxide done
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D)
Carbon monoxide done
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question_answer26)
On which of these factors does the flame produced by a fuel depend upon?
A)
Calorific value done
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B)
Amount of oxygen done
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C)
The chemical composition of a fuel done
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D)
All of the above done
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question_answer27)
Which of the following statements is NOT true?
A)
\[C{{O}_{2}}\]is the best fire extinguisher. done
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B)
Global warming can cause acid rain. done
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C)
Burning of coal and diesel releases sulphur dioxide gas. done
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D)
L.P.G. has higher calorific value than biogas. done
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question_answer28)
Why is L.P.G, used as domestic fuel, mixed with a strong smelling volatile liquid like mercaptan?
A)
For better combustion done
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B)
For good smell/fragrance done
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C)
For detection of gas leakage done
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D)
For higher calorific value done
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question_answer29)
Hydrogen gas has the highest calorific value i.e., \[150\,kJ\,k{{g}^{-1}},\]yet it is not used as a fuel. Why?
A)
It is explosive in nature. done
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B)
It causes storage problem. done
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C)
It causes transportation problem. done
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D)
All of the above done
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question_answer30)
When wood is used as a fuel in chullahs, gaps are left in between logs of wood. Why is it done so?
A)
To facilitate movement of air done
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B)
To prevent more consumption of wood done
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C)
To control temperature done
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D)
All of these done
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question_answer31)
For a spontaneous combustion to take place, which condition given below is necessary?
A)
Flame done
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B)
Low ignition temperature done
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C)
Rise in temperature done
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D)
Temperature below 30°C done
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question_answer32)
An electric spark is struck between two electrodes placed near each other, inside a closed tank full of petrol. What will happen?
A)
Spontaneous combustion of petrol done
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B)
Explosion done
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C)
Slow combustion of petrol done
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D)
Nothing will happen done
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question_answer33)
One gram of which of these will give out the maximum amount of heat by complete combustion?
A)
Wood done
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B)
Coal done
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C)
Diesel done
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D)
Biogas done
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question_answer34)
What are the essential requirements for a fire to start and continue?
(i) Fuel |
(ii) Air (oxygen) |
(iii) Heat |
A)
Only (i) and (ii) done
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B)
Only (ii) and (iii) done
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C)
Only (i) and (iii) done
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D)
(i), (ii) and (iii) done
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question_answer35)
Which of the following statements is NOT true?
A)
Spontaneous combustion takes place without any apparent cause. done
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B)
The luminous zone of a flame has high temperature. done
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C)
Carbon dioxide gas causes global warming. done
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D)
The calorific value of a fuel is expressed in \[kJ/k{{g}^{-1}}.\] done
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