CBSE Questions for Class 8 Chemistry Combustion And Flame Quiz 10 - MCQExams.com

The flame of the candle has three zones. The outer zone is blue, the middle zone is yellow and the inner zone is black. Which is correct regarding this?
  • The outer zone is hottest zone.
  • The middle zone is hottest.
  • The inner zone is least hot.
  • All the zones have same temperature.
Holmes signals can be given by using:
  • $$CaC_2+Ca(CN)_2$$
  • $$CaC_2+Ca_3P_2$$
  • $$CaC_2+CaCO_3$$
  • $$Ca_3P_2+Ca(CN)_2$$
Complete combustion of $$CH_{4}$$ gives:
  • $$CO_{2}+H_{2}O$$
  • $$CO_{2}+H_{2}$$
  • $$COCl_{2}$$
  • $$CO+CO_{2} + H_{2}O$$
Soda acid fire extinguishers contains sulphuric acid and:
  • sodium bicarbonate and sodium carbonate
  •  sodium bicarbonate
  • sodium carbonate
  • calcium carbonate
Which of the following statements are true about fuel efficiency?
  • Calorific value helps determine the fuel efficiency of a fuel.
  • Calorific value is the amount of heat energy produced on complete combustion of 1 kg of a fuel.
  • Calorific value is expressed in $$kJ/kg$$.
  • All of these
What is used as a fuel in jet planes?
  • Liquid Petrol
  • Diesel oil
  • Kerosene
  • LPG
Fire-related deaths are mostly due to:
  • smoke inhalation
  • burns
  • presence of $$CO_2$$
  • over inhalation of nitrous oxide
Which of the  following does not burn with a flame?
  • Kerosene
  • Coal
  • Candle
  • All of these

Choose the correct statement about inflammable substances from the following. They have:
  • low ignition temperature and cannot catch fire easily.
  • high ignition temperature and can catch fire easily.
  • low ignition temperature and can catch fire easily.
  • high ignition temperature and cannot catch fire easily.
Which of the following has lowest ignition temperature ?
  • LPG
  • Petrol
  • Coal
  • Kerosene
Which of the following does not represent characteristic of a good fuel?
  • It should have a low calorific value
  • Its ignition temperature should be low but well above the room temperature
  • It should be fairly cheap
  • It should be safe to handle and transport
  • None of these
Which of the following substance(s) is(are) inflammable?
  • Petrol
  • LPG
  • Wood
  • All of the above
Some uses of chlorine and bromine are given.
Which is a use of bromine?
  • making bleaches for textiles and the the paper industry
  • making CFC's
  • making flame retardants and fire extinguishers
  • making the polymer PVC

A good fuel is one which:
  • has a high ignition temperature.
  • produces a large amount of heat.
  • leaves behind many undesirable substances.
  • None of the above
The compounds which are rich in carbon on burning produce:
  • Lampblack
  • Petrol
  • Oxygen
  • None of these
Write True/False against the following statements and also correct the false statement.
Greater the calorific value better is the fuel.
  • True
  • False
State True or False:

Carbon tetrachloride is inflammable.
  • True
  • False
Alcohol, CNG and LPG are inflammable substances.
  • True
  • False
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