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WorksheetsClass 8 Ch:6 Combustion and flame
Total questions: 25
Worksheet time: 2hrs 5mins
Fuel may be _____, _______ or gas.
Petrol; CNG
Solid; Liquid
Diesel; Petrol
Water; Diesel
Give two examples of combustible substances
Magnesium and Charcoal
Iron and Glass
Straw and Stone
None of the above
What fire extinguishers is needed for fires involving in
a) Paper b) Oil
c) Cloth d) Petrol
Use water for a and b
Use water for b and d
Use water for a and c
Use water or A and d
What is the light given off during combustion
Carbon fuels
A glow
A diamond
Oxygen
Combustion take places in the body
True
False
In the sun, heat and light is produced by __.
Nucleic Acid
Nuclear Bomb
Nuclear Power
Nuclear reaction
When was the modern safety match developed?
100 years
2 centuries
2000 years
1000 years
Which is not a characteristic of rapid combustion
It has to be initiated once
External Heat is required to start it
Small amount of heat and light is evolved in a short period of time
None of the above
Define Flame.
A region of burning gases
A region of burning solids
A region of burning liquid
None of the above
What is the calorific value of Wood
6000-8000 kJ/kg
10000-12000 kJ/kg
15000-22000 kJ/kg
17000-22000 kJ/kg
25000-33000 kJ/kg
Name a fuel which have been replaced by wood as domestic and industrial fuels in the recent years.
Cow dung
Wood
CNG
LPG
Both CNG and LPG
Petrol Engines gives off gaseous oxides of
Hydrocarbon
Nitrogen
Oxygen
Sulphur
Sun is some kind of a combustion
True
False
When did ancient Egypt started making matchsticks
more than 10,000 years ago
more than 100,000 hours ago
more than 1000 yeas ago
more than 5000 years ago
What are the materials needed to make the head of a modern matchstick
Antimony trisulphide, Potassium chlorate, red phosphorus, glue and starch
Antimony bisulphide, Potassium chlorate, red phosphorus.
Antimony trisulphite, Potassium chlorate, white phosphorus, glue starch
Antimony bisulphite, Potassium chlorate, white phosphorus, glue starch
Which has a low ignition temperate; Kerosene or wood
Kerosene
Wood
Both kerosene and wood
Neither Kerosene nor wood
Which is not required to start a combustion
Air
Ignition Temperature
Fuel
A person
How do we store the supply of CO2.
Cuboid in High pressure
Cube in High pressure
Cylinder in High pressure
Prism in High pressure
How is CO2 stored?
It is stored in a solid form
It is stored in a liquid form
It is stored in a gaseous form
None of the above
What is the result of spontaneous combustion of coal dust?
Instant revival
Instant superpower
Instant Disastrous Fire
Instant heart attack
What substances doesn't forms flames
Candle
Camphor
Charcoal
Molten wax
Which is not a characteristic of an ideal fuel
Cheap
Readily available
High calorific value
Transportation is quite hard
None of the above
SI unit of calorific value
kJ/kg
kg/kJ
J/g
g/J
Wood is beneficial as a fuel
True
False
What is sulphur dioxide gas?
Extremely suffocating gas
Extremely corrosive gas
Burning of coal releases this gas
None of the above
