Question 1

In combustion

Accepted Answer

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

Question 2

Fuel may be

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

Explosion takes place because of

Accepted Answer

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 
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

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

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 
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 7

A person caught fire on clothes is wrapped with blanket because

Accepted Answer

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 
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 8

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

Accepted Answer

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 
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 9

Ignition temperature is

Accepted Answer

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 
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

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

Accepted Answer

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

Exam 1: Combustion and Flam: Combustion and Fire Safety