MCQ on Combustion and Flame
1.Burning of wood and coal causes ……………..of air.
(A) Suffocation
(B) Pollution
(C) Oxygen
(D) None of the above
2.Fire produced by oil cannot be controlled by ………………
(A) Carbon dioxide and foam
(B) Water
(C) Both A and B
(D) None of the above
3.Fuel must be heated to its………………… before it starts burning.
(A) Spontaneous temperature
(B) Ignition temperature
(C) Self ignition temperature
(D) Minimum ignition temperature
4.A liquid fuel, used in homes is…………………………
(A) CNG
(B) Petroleum
(C) Kerosene oil
(D) Charcoal
5.The substance which burns in air are called ………………….
(A) Ignition temperature
(B) Pollutants
(C) Combustible
(D) None of the above
6.A chemical process in which a substance reacts with oxygen to give off heat is called
(A) Inflammation
(B) Oxidation
(C) Combustion
(D) All of the above
7.Combustible is also called
(A) Mixture
(B) Fuel
(C) Ignition
(D) Temperature
8.Which of the following is/are combustible substance?
(A) Charcoal
(B) Magnesium
(C) Matchsticks
(D) All of the above
9.Food in our body is broken down by reaction with …………and heat is produced.
(A) Oxygen
(B) Haemoglobin
(C) Carbon dioxide
(D) All of the above
10………is necessary for combustion.
(A) Air
(B) Oxygen
(C) Both A and B
(D) None of the above
Answers: –
| 1-(B) | 2-(B) | 3-(B) | 4-(C) | 5-(C) | 6-(C) | 7- (B) | 8-(D) | 9-(A) | 10-(C) |