CBSE Class 8 Science Combustion and Flame Quiz 3

1. Out of these, which is able to control fires?

A NH3 B H2 C CO2 D F2

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

A Outer zone B Middle zone C Inner zone D Lower zone

3. Calorific value of a fuel is expressed in

A kilojoule per kilogram B kilojoule per gram C joule per milligram D kilojoule per milligram

4. Which is non-combustible substance?

A Wood B Paper C Iron nails D Straw

5. Acid rain contains mainly

A oxygen and nitrogen gas B fluorine and chlorine gas C magnesium oxide D nitrogen oxide and sulphur dioxide