Combustion And Fossil Fuels-1

The burning of LPG is an example of:

• Spontaneous combustion

• Rapid combustion

• Explosion

• Slow combustion

Name the gas known to be the supporter of combustion:

• Carbon dioxide

• Oxygen

• Hydrogen

• None of the aove

Which zone represents the partial combustion in candle flame?

• Outer Zone

• Middle Zone

• Innermost Zone

• None of the above

Out of these, which is able to control fires?

• Oxygen

• Carbon dioxide

• Nitrogen

• All of the above

Which zone of a flame does a goldsmith use for melting gold and silver ?

• Outer zone

• Middle zone

• Inner zone

• All of the above

During the burning of a candle, the substance that burns is the:

• wick

• solid wax

• liquid wax

• wax vapours

Which of the following substance is non-combustible?

• (a) Wood

• (b) Biogas

• (c) Kerosene oil

• (d) A piece of stone

When water is poured over burning wood, the fire goes off. This is because

• (a) The temperature of water goes up

• (b) The temperature of wood decrease

• c) Molecules of water reacts with with oxygen present in the flame.

• (d) The flame vaporizes.

CNG and LPG are the examples of:

• (a) Solid fuels

• (b) Liquid fuels

• (c) Gaseous fuels

• (d) They are not fuels

What is the colour of a luminous flame?

• Blue

• Black

• Yellow

• Red