CBSE Class 8 Science - Combustion and Flame (1)
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COMBUSTION AND FLAME
1.Which is not an example of inflammable substance?
(A) Charcoal. (B) Petrol. (C) Alcohol. (D) LPG.
2.The head of the safety match contains-
(A) antimony trisulphide. (B) potassium chlorate.
(C) Both (a) and (b). (D) None of these.
3.When a frying pan containing cooking oil is kept for long on a burning stove then cooking
oil catches fire because-
(A) Its temperature is lower than its ignition temperature.
(B) Its temperature is reached to its ignition temperature.
(C) Both (a) and (b) are correct.
(D) Neither (a) nor (b).
4.The minimum temperature at which a substance catches fire is-
(A) Melting point. (B) Ignition temperature.
(C) Boiling point. (D) Critical temperature.
5.Which gas is supporter of combustion?
(A) CO2. (B) He. (C) O2. (D) Ne.
6.Find odd one out-
(A) Coal. (B) Glass. (C) Wood. (D) Paper.
7.Pollution can be reduced by using-----in automobiles.
(A) Petrol. (B) Diesel. (C) Kerosene. (D) CNG.
8.Combustion is a -
(A) Physical process (B) Chemical process
(C) Both (a) and (b) (D) None of these
9.Which of the following is not true for water?
(A) Water is the most common fire extinguisher.
(B) Water works only when things like wood and paper are on fire.
(C) Water cannot works for fire involving electrical equipments.
(D) Water is suitable for fires involving oil and petrol.
10.Which substance is used to extinguish fire involving electricity?
(A) Nitrogen. (B) CO2. (C) Water. (D) All.
11.CO2 can be stored in cylinder in-------state at -----pressure.
(A) liquid, high. (B) gas, high. (C) gas, low. (D) liquid, low.
12.Which is not the requirement for burning?
(A) Heat. (B) O2. (C) Fuel. (D) CO2.
13.The combustion of coal dust in coal mines is-
(A) Rapid combustion. (B) Explosion.
(C) Spontaneous combustion. (D) None of these.
14.Find odd one out-
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