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Combustion and Flame

Combustion and Flame- 7th Std Science 3rd Term

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Question 1
During combustion light is evolved along with
A
Heat
B
Flame
C
Air
D
None of these
Question 2
Substances that catch fire easily are
A
Inflammable
B
Non-combustible
C
Heavy
D
Light
Question 3
LPG is a mixture of
A
Methane and Propane
B
Propane and Butane
C
Butane and Methane
D
None of these
Question 4
Rusting of iron is an example of ______ combustion.
A
Slow
B
Rapid
C
Spantaneous
D
Incomplete
Question 5
________ is a good supporter of combustion.
A
Oxygen
B
Carbon dioxide
C
Nitrogen
D
Hydrogen
Question 6
Petrol is a
A
solid fuel
B
Highly inflammable
C
Non-combustible Substance
D
Less inflammable substance
Question 7
  • Fill in the blanks
The lowest temperature at which fuel catches fire is called ______
A
auto ignition temperature
B
Ignition Temperature
C
Flash point
Question 8
_______ is used to extinguish oil fire.
A
Foamite
B
Hit
Question 9
The amount of heat energy liberated by completely burning 1 kg. of fuel is called ______
A
Temperature
B
Calorific Value
C
Heating Value
Question 10
In the ________ people used to eat raw food.
A
Stoge Age
B
Modern Age
C
Iron Age
Question 11
By rubbing two ______ together people could produce fire.
A
Gold
B
stones
C
Iron
Question 12
Fire is obtained by the _______ combustion of materials.
A
Verna
B
Vento
C
Rapid
Question 13
The substance that undergoes combustion is called _____
A
oil
B
Fuel
C
Gas
Question 14
________ burns in air producing carbon dioxide, heat and light.
A
Coal
B
Gold
C
Petrolium
Question 15
________ is combustible.
A
drumstick
B
Match stick
C
fire extinguisher
Question 16
__________ is necessary for combustion.
A
lithium
B
Nitrogen
C
Oxygen
Question 17
White phosphorus undergoes _________ combustion.
A
Nitrogen
B
Oxygen
C
Hydrogen
Question 18
Solid carbon dioxide is used to put off ________ fire.
A
Magnetic
B
Electric
C
Mechanical
Question 19
The luminous part of the candle flame is _________ colour.
A
Yellow
B
Green
C
Red
Question 20
Thermal power stations depend heavily on ________ for generating electricity.
A
Oil
B
fuels
C
Gas
Question 21
The hottest region of the candle flame is ______ region.
A
Green
B
Blue
C
Yellow
Question 22
The main constituents of fuels are ___________
A
hydrocarbons
B
Lithium
C
Nitrogen
Question 23
The ______ the heat energy evolved, the better is the fuel.
A
higher
B
Lower
Question 24
Paraffin is a _________ fuel
A
Liquid
B
Solid
C
Gas
Question 25
________ is an oily mixture of hydrocarbons in its crude form.
A
Petroleum
B
Nitrogen
C
Coal
Question 26
Natural gas is obtained from _______
A
Petroleum wells
B
Lithium
C
Hydrocarbon
Question 27
The cheapest form of gaseous fuel is ______
A
lithium Gas
B
Bio gas
C
Nitrogen Gas
Question 28
_____ has a characteristic odour is added to LPG to detect any leak.
A
Methyl Mercaptan
B
Ethyl Alcohol
C
Ethyl mercaptan
Question 29
_________ is a clean fuel.
A
Compressed Natural Gas
B
Natural Gas
C
Propane
Question 30
Match the following.
  1. Oxide of Sulphur and Nitrogen     a. Luminous flame
  2. Biogas                                b. Non-luminous flame
  3. Ethyl alcohol                          c. Acid rain
  4. Yellow colour flame                    d. Gaseous fuel
  5. Blue colour flame                          e. Liquid fuel
A
1 5 4 2 3
B
4 5 1 2 3
C
2 1 5 3 4
D
5 3 4 1 2
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