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