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1
Types of combustion are _______________________
Rapid
Spontaneous, rapid and explosive
Explosive
Spontaneous
2
When water is poured over burning wood, the fire goes off. This is because ___________________________
Temperature of wood decreases
Temperature of water goes up
Molecules of water reacts with oxygen present in the flame
The flame vapourises
3
Soda acid fire extinguisher is made up of _______________________________.
Sodium hydroxide carbonate and sulphuric acid
Sodium hyroxide and Hydrochloric acid
Sodium hydroxide and nitric acid
water and acid
4
Which of the following is a non combustible substance?
Paper
Wood
Iron
Wool
5
The heat produced by burning 1 kg of fuel completely is known as ____________________________.
Heat capacity
Calorific value
Vapour density
Boiling point
6
What should be the state of a substance to undergo combustion?
Solid or liquid
Liquid or gas
Soil, Liquid or gas
Only liquid
7
Water cannot be used as fire extinguisher to put out ____________________ .
Buring wood
Burning oil
Burning cloth
Burning charcoal
8
Which does not produce flame on burning ?
Candle wick
A wick dipped in kerosene
Charcoal
Camohor.
9
Which type of fire extinguisher is used to extinguish fire caused by burning oil and petrol ?
Foam type
Water type
Soda acid type
type
10
Substance which vapories during burning gives ________________.
Sound
Flame
Combustion
None of these
11
Which of the following is a noncombustible substance ?
Coke
Diamond
Coal
12
Combustion is a ___________ reaction accompanied by heat and light.
Reduction
Redox
Substitution
Oxidation
13
In foam type extinguisher __________ is present in bottle.
14
Outermost zone of flame is called ____________________ .
Luminous zone
Non - luminious zone
Dark zone
15
Non luminous flame undergoes _____________________ combustion.
Complete
Total
Incomplete
No