CBSE Class 8 Science Combustion and Flame Assignment Set A

Question. Element showing spontaneous combustion is
(a) Calcium
(b) Phosphorous
(c) Lithium
(d) Copper

Answer : C

Question. Which of the following is/are carbon fuel
(a) Wood
(b) Coal
(c) Petroleum
(d) All of these

Answer : D

Question. Combustion of most fuels releases
(a) CO2
(b) SO2
(c) NO2
(d) Oxygen

Answer : A 

Question. Acid rain is caused by oxides of
(a) Sulphur, Nitrogen
(b) Sulphur, Carbon
(c) Carbon, Nitrogen
(d) Phosphorous, Carbon

Answer : A

Question. Which is a solid fuel?
(a) Petrol
(b) Diesel
(c) Wax
(d) Wood

Answer : C

Question. In the sun, heat and light are produced by
(a)Chemical reactions
(b)Nuclear reactions
(c)Ionic reactions
(d)None of these

Answer : B

Question. The head of the safety match contains
(a) Antimony trisulphide
b Potassium Chlorate
(c) Both (a) and (b)
(d) None of these

Answer : C

Question. When the match struck against rubbing surface, red phosphorous
(a) Converts into white phosphorous
(b) Reacts with potassium chlorate
(c) Ignite antimony trisulphide
(d) None of these

Answer : A

Question. Best extinguisher for inflammable Materials is
(a) Water
(b) SO2
(c) CO2
(d) CO

Answer : C

Question. 48 CO2 is stored as a liquid in cylinder at
(a) High pressure
(b) Low pressure
(c) High temperature
(d) Low temperature

Answer : A

Question. Global warming is caused due to____ concentration of Co2 in air
(a) Decreased
(b) Increased
(c) Both (a) & (b)
(d) None of these

Answer : B

Question. Burning of coal and diesel releases
(a) NO2
(b) CO2
(c) SO2
(d) CO

Answer : C

Question.Petrol engine gives off gaseous oxides of
(a) Sulphur
(b) Nitrogen
(c) Phosphorous
(d) Carbon

Answer : B

Question. CO2 is given off by chemicals like
(a) Sodium bicarbonate
(b) Calcium sulphate
(c) Sodium sulphate
(d) Sulphuric acid

Answer : A

Question. Water is not suitable for fire involving
(a) Oil
(b) Petrol
(c) Both (a) & (b)
(d) None of these

Answer : C

Question. Amount of heat energy produced on _____combustion of 1kg of fuel is Calorific value
(a) Incomplete
(b) Complete
(c) Half
(d) None of these

Answer : B

Question. Which is better domestic fuel
(a) CNG
(b) LPG
(c) Wood
(d) Coal

Answer : B

Question. Which of the following has lower ignition temperature?
(a) Wood
(b) Paper
(c) Vegetable oil
(d) Kerosene oil

Answer : D

Question. Which one of the following is non Combustible?
(a) Stone piece
(b) Paper
(c) Straw
(d) Matchsticks

Answer : A

Question. In the presence of water, ignition Temperature of paper is-
(a) Decrease
(b) Increase
(c) Remain constant
(d) None of these

Answer : A

Question. Use of ….. in vehicle reduces pollution
(a) Petrol
(b) Diesel
(c) CNG
(d) None of these

Answer : C

Question. During the process of combustion ________is given out
(a) Heat
(b) Light
(c) Sound
(d) Both heat & light

Answer : D

Question. The most common fire extinguisher is
(a) Water
(b) CO2
(c) Oxygen
(d) Hydrogen

Answer : A

Question. Ideal fuel has ____ calorific value
(a) Low
(b) High
(c) Moderate
(d) Zero

Answer : B

Question. Calorific value gives the
(a) Fuel efficiency
(b) Amount of heat
(c) Amount of light
(d) None of these

Answer : A

Question. Calorific value is measured in
(a) Kilo joule
(b) Kilograms
(c) Kilo joule per Kg
(d) Kilometre

Answer : C

Question. Unburnt carbon particles causes
(a) Stomach infections
(b) Respiratory problems
(c) Brain infections
(d) Throat problems

Answer : B

Question. Yellow colour in the flame denotes
(a) Outermost part
(b) Middle zone
(c) Innermost zone
(d) None of these

Answer : B

Question. Good fuel is
(a) Readily available
(b) Cheap
(c) Burn easily in air
(d) All of these

Answer : D

Question. On burning fuel produces….. amount of heat
(a) Large
(b) Less
(c) Very less
(d) No heat

Answer : A

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.

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