Chemistry II Combustion
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MANOJ MChemistry II Combustion
Uploaded by
MANOJ MMultiple Choice Questions
Combustion and Flame
1.
In the presence of water, ignition Temperature of paper is
a. Decrease
b.
Increase
c.
Remain constant
d.
None of these
Ans. (b)
2.
The lowest temperature at which a Substance catches fire is called its
a. Boiling point
b.
Melting point
c. Ignition temperature
d.
Critical temperature
Ans. (c)
3.
Which of the following is inflammable Substances?
a. Petrol
b.
Wood
c.
Paper
d.
Straw
c.
Heat
d.
All of these
Ans. (a)
4.
Essential requirements for producing fire are:
a. Fuel
b.
Air
Ans. (d)
5.
Fire extinguisher
a. Cut off the supply of air b.
Bring down the temperature of fuel
c. Both (a) & (b)
d.
None of these
c.
Sound
d.
All of these
c.
Combustion
d.
None of these
Ans. (c)
6.
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
Ans. (a)
7.
Explosion is the evolution of
a. Heat
b.
light
Ans. (d)
8.
Substance which vaporise during Burning gives
a. Sound
b.
Flame
Ans. (b)
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9.
Which is the hottest part in the flame of the candle
a. Blue
b.
Yellow
c.
Black
d.
Wax part
c.
Least hot part
d.
Cold part
Ans. (a)
10.
Innermost zone of candle flame is the
a. Hottest part
b.
Moderately hot part
Ans. (c)
11.
Yellow colour in the cande flame denotes
a. Outermost part
b.
Middle zone
c.
Innermost zone
d.
None of these
b.
Cheap
c.
Burn easily in air
d.
All of these
c.
Very less
d.
No heat
c.
CNG
d.
None of these
c.
Moderate
d.
Zero
c.
Kilo joule per Kg
d.
Kilometre
a. Stomach infections
b.
Respiratory problems
c. Brain infections
d.
Throat problems
c.
Carbon
d.
None of these
Ans. (b)
12.
Good fuel is
a. Readily available
Ans. (d)
13.
On burning fuel produces.. amount of heat
a. Large
b.
Less
Ans. (a)
14.
Use of .. in vehicle reduces pollution
a. Petrol
b.
Diesel
Ans. (c)
15.
Ideal fuel has ____ calorific value
a. Low
b.
High
Ans. (b)
16.
Calorific value is measured in
a. Kilo joule
b.
Kilograms
Ans. (c)
17.
Unburnt carbon particles causes
Ans. (b)
18.
Incomplete combustion gives
a. CO2
Ans. (b)
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b.
CO
19.
Goldsmith uses ____part of the flame for melting gold
a. Outermost
b.
Middle
c.
Innermost
d.
Both (b) & (c)
c.
SO2
d.
CO
c.
Phosphorous
d.
Carbon
a. Sulphur, Nitrogen
b.
Sulphur, Carbon
c. Carbon, Nitrogen
d.
Phosphorous, Carbon
Ans. (a)
20.
Burning of coal and diesel releases
a. NO2
b.
CO2
Ans. (c)
21.
Petrol engine gives off gaseous oxides of
a. Sulphur
b.
Nitrogen
Ans. (b)
22.
Acid rain is caused by oxides of
Ans. (a)
23.
In the sun, heat and light are produced by
a. Chemical reactions
b. Nuclear reactions
c. Ionic reactions d.None of these
Ans. (b)
24.
The head of the safety matchsticks contains
a. Antimony disulphide
b.
Potassium Chlorate
c. Both (a) and (b)
d. None of these
Ans. (c)
25.
When the matchsticks struck against rubbing surface, red phosphorous
a. Converts into white phosphorous
b.
Reacts with potassium chlorate
c. Ignite antimony disulphide
d.
None of these
Ans. (a)
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