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Class VIII >> Science >> Combustion and Flame >> A1

Q1	Fuels are the substances that produce __________.
A	Heat and Sound
B	Light and Sound
C	Heat but not Light
D	Heat and Light

Q2	Which of these is an example of combustible substance?
A	Water
B	Sand
C	Glass
D	Paper

Q3	Which of the following is NOT an example of a gaseous fuel?
A	Biogas
B	Charcoal
C	LPG
D	Petroleum Gas

Q4	__________ is the process in which a substance reacts with oxygen to give off heat.
A	Evaporation
B	Combustion
C	Condensation
D	Conduction

Q5	Which of the following is an example of an inflammable substance?
A	Petrol
B	Kerosene
C	Liquefied Petroleum Gas
D	All of the Above

Q6	A fireman extinguishes the fire by __________.
A	Cutting off the Supply of Air
B	Bringing Down Temperature of Fuel
C	Both of the Above
D	None of the Above

Q7	The substances which have low ignition temperature and catch fire easily are called __________.
A	Inflammable
B	Non-combustible
C	Conductors
D	Insulators

Q8	The amount of __________ produced on complete combustion of 1 kg of a fuel is called its calorific value.
A	Heat Energy
B	Sound Energy
C	Light Energy
D	Wind Energy

Q9	Fuels are used for __________.
A	Cooking
B	Generation of Electricity
C	Automobiles
D	All of the Above

Q10	Which of the following is commonly used to control fires?
A	Petrol
B	Water
C	Diesel
D	Kerosene

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