Deck 1: Combustion and Flam: Combustion and Fire Safety

Question 1

A chemical process in which a substance reacts with oxygen to give off heat is called

A)Conduction
B)Conjunction
C)Combustion
D)Confusion

Answer 1

Combustion

Question 2

Fuel may be

A)Solid only
B)Solid,Liquid or gas
C)Liquid only
D)Gas only

Answer 2

Solid,Liquid or gas

Question 3

The amount of heat energy produced on complete combustion of_____ fuel is called its calorific value.

A)1 litre
B)1 Kg
C)1 milli litre
D)1 gram

Answer 3

1 Kg

Question 4

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

A)inflammable substances
B)Flaming substance
C)Fire proof substance
D)None of the above

Question 5

When we heat water in a paper bowl over a candle, the paper does not catch fire because

A)Paper is not inflamable
B)Paper gets wet
C)Due to water the ignition temperature of paper is not reached
D)This is not possible

Question 6

When oil or petrol catches fire, water is not used to extinguish it because

A)Water covers oil and oil burns under water layer which may not be noticeable
B)Water is heavier than oil / petrol and so remains below the oil layer which continues to burn
C)Water get mixed with oil and increases fire
D)Water gets evaporated

Question 7

In combustion

A)Both heat and light is produced
B)Only heat is produced
C)Only light is produced
D)All are correct

Question 8

A person caught fire on clothes is wrapped with blanket because

A)The person suddenly feels cold
B)To hide the burnt body parts
C)The person's clothes gets burnt
D)To reduce air supply and put fire off

Question 9

Ignition temperature is

A)The maximum temperature at which a substance catches fire
B)The minimum temperature at which a substance catches fire
C)The temperature of burning substance
D)The temperature in the substance when

Question 10

Explosion takes place because of

A)Release of large amount of gas under pressure due to sudden reaction
B)Release of large amount of heat
C)Release of large amount of light
D)None of the above