CBSE Class 8 - Science - Ch 6 - Combustion & Flame (MCQs)

Combustion & Flame

Combustion & Flame
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(MCQs)

Q1: Which of the following is the chemical process in which a substance reacts with oxygen to give off heat?

(a) Electrolysis
(b) Combustion
(c) Ignition
(d) Friction


Q2: The substance which undergoes combustion is called …

(a) Fuel
(b) Energy
(c) Light
(d) Matter


Q3: Which of the following is not a combustible substance?

(a) Magnesium
(b) Charcoal
(c) Petrol
(d) Glass


Q4: Which of the following has the lowest ignition temperature?



(a) Keroscene
(b) Petrol
(c) Wood
(d) Coal


Q5: The substances which have very low ignition temperature and can easily catch fire with a flame are called …

(a) Unflammable substances
(b) Combustible substances
(c) Inflammable substances
(d) Luminous substances


Q6: Which of the following is used to extinguish electrical fires?

(a) Water
(b) Carbon dioxide
(c) Foam
(d) Blanket


Q7: The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called …

(a) quick combustion
(b) scary combustion
(c) spontaneous combustion
(d) explosion


Q8: The sudden evolution of large volume of gases created excessive pressure,which producesa very loud noise. Such a combustion is known as …

(a) Rapid combustion
(b) Slow combustion
(c) Spontaneous combustion
(d) Explosion




Answers:
1: (b) Combustion
2: (a) Fuel
3: (d) Glass
4: (b) Petrol

5: (c) Inflammable substances
6: (b) Carbon dioxide
7: (c) spontaneous combustion
8: (d) Explosion