The calorific value of a fuel is expressed in a unit called
  • kilojoule per kilogram
  • kilojoule per litre
  • kilojoule per gram
  • kilogram per mililitre
Match the column
class8-combustion-and-flame-1.png
  • p -> iv, q -> i, r -> ii , s ->iii
  • p -> iii, q -> iv, r -> i , s ->ii
  • p -> iv, q -> iii, r -> ii, s ->i
  • p -> ii, q -> iv, r -> iii , s ->i
The substance that does not burn with flame is
  • camphor
  • charcoal
  • LPG
  • dry grass
The substance expected to have the highest ignition temperature out of the following is
  • kerosene
  • coal
  • petrol
  • alcohol
Combustion is
  • Physical Process
  • Chemical process
  • Both of these
  • None of these
The lowest temperature at which a substance catches fire is called its
  • Burning temperature
  • ignition temperature
  • None of these
  • inflammable temperature
Which gas is produced when sodium bicarbonate and concentrated sulphuric acid mix?  
  • Carbon monoxide
  • Hydrogen
  • Oxygen
  • Carbon dioxide
What is the calorific value of biogas?
  • 1,50,000
  • 35,000-40,000
  • 23,000
  • 30,00,000
Which of the following is an example of gaseous fuel?
  • Kerosene
  • Petrol
  • Natural gas
  • Diesel
Which of the following is an example of primary fuel?
  • Wood
  • Charcoal
  • Coke
  • Coal tar
What is the full form of CNG?
  • Combined Natural Gas
  • Cover Nature Gasoline
  • Compressed Natural Gas
  • Consumption Nature Gas
Which of the following is the luminous zone of candle flame?
  • Outermost Zone
  • Innermost Zone
  • Middle Zone
  • All of these
Which of the following gas is required for complete combustion?
  • Oxygen
  • Carbon monoxide
  • Carbon dioxide
  • None of these
Which of the following gas is responsible for acid rain?
  • Oxygen
  • Helium
  • Oxides
  • Hydrogen
Which element particles form the particulate matter when they do not burn?
  • Nitrogen particles
  • Oxygen molecules
  • Carbon particles
  • Boron particles
Which disease can be caused due to the continuous inhalation of lead compounds?
  • Diabetes
  • Thyroid
  • Gall Stones
  • Cancer
which substance is also known as marsh gas?
  • $CH_4$
  • $CO_2$
  • $CO$
  • $NH_3$
which of the followings has the highest calorific value?
  • LPG
  • Coal
  • Hydrogen
  • Biogas
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