Combustion and Flame

Which substance gives heat and light after combustion

• Flame

• Fuel

• Combustion

• None of these

Coal burns with ____________________________

• Flame

• Only glow

• Both flame and glow

• None of these

Burning of charcoal in a closed room will produce

• Carbon dioxide

• Nitrogen dioxide

• Carbon monoxide

• Sulphur dioxide

The substances which have very low ignition temperature

• Catch fire easily

• Will not catch fire

• Catch fire after some time

• None of these

Ignition temperature is

• Lowest temperature a substance catches fire

• Highest temperature a substance catches fire

• Any temperature

• 100⁰ C

Combustion is a

• Natural process

• Chemical process

• Physical process

• None of these processes

When magnesium ribbon burnt it produces

• Magnesium hydroxide

• Magnesium oxide

• Magnesium chloride

• Magnesium sulphate

Which one of the following is the fuel of our body?

• Petrol

• Diesel

• Water

• Glucose

In the presence of water, ignition temperature of paper

• Decreases

• Increases

• Remains constant

• None of these

Which is the hottest part in the flame of the candle

• Yellow

• Wax part

• Black

• Blue