EASY
8th CBSE
IMPORTANT
Earn 100

Some words (underlined) in the following sentence is jumbled up. Write it in the correct form.

The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value.

Important Questions on Combustion and Flame

EASY
8th CBSE
IMPORTANT
Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?
MEDIUM
8th CBSE
IMPORTANT
Anu wants to boil water quickly in a test tube. On observing the different zones of the flame, she is not able to decide which zone of the flame will be best for boiling water quickly. Help her in this activity.
MEDIUM
8th CBSE
IMPORTANT
Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities?
MEDIUM
8th CBSE
IMPORTANT
Boojho wants to separate the following materials as combustible and non-combustible. Can you help him?
Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood.
EASY
8th CBSE
IMPORTANT

Air is necessary for combustion.

EASY
8th CBSE
IMPORTANT

Magnesium is a non-combustible metal.

MEDIUM
8th CBSE
IMPORTANT

Carbon dioxide is an excellent fire extinguisher.

MEDIUM
8th CBSE
IMPORTANT
Calorific value of wood is higher than that of coal.