MCQ on Combustion and Flame

CBSE/NCERT 8th Class MCQ CBSE/NCERT 8th Class MCQ on Science

31.A large amount of gas formed in the reaction is liberated such a reaction is called

(A) Explosion

(B) Self Combustion

(C) Fire

(D) None of the above


32.The substance which vapourise during burning and form flames are

(A) Kerosene oil

(B) Molten wax

(C) Both A and B

(D) None of the above


33.What part of the flame has a high temperature?

(A) Blue flame

(B) Yellow flame

(C) Black flame

(D) None of the fame


34.which of the following substance/s called fuels?

(A) Charcoal

(B) Wood

(C) Petrol and Kerosene

(D) All of the above


35.The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its

(A) Calorific value

(B) Calories value

(C) Kilroy’s value

(D) None of the above


36.The calorific value of a fuel is expressed in a unit called …………..

(A) Joule per kg (KJ/kgk)

(B) Kilojoule per kg (KJ/kg)

(C) Watt per kg

(D) None of the above


37.Which of the following fuel has highest calorific value?

1. Hydrogen

2. Biogas

3. LPG

4. CNG

5. Methan

(A) Hydrogen

(B) Methane

(C) LPG and CNG

(D) Biogas


38.Consider the statement and choose the correct answer.

The burning of coal in a closed room is dangerous because on burning it produced very poisonous gas which cause death.

What type of gas is produced when coal is burnt?

(A) Argon

(B) Carbon dioxide

(C) Carbon monoxide

(D) Hydrogen


39.Incomplete combustion of a fuel gives poisonous ……………………gas.

(A) Carbon monoxide

(B) Carbon dioxide

(C) Ashes

(D) All of the above


40.Fuel efficiency is expressed in terms of its

(A) Calorific value

(B) Kilojoule per kg

(C) Calorie value

(D) None of the above


31- (A) 32- (C) 33-(A) 34-(D) 35-(A) 36-(B) 37-(A) 38-(C) 39-(A) 40-(A)