Which of the following substances has the lowest ignition temperature? - spirit
One of the following is not a combustible substance. This one is: - asbestos
Which of the following is not used in making matchsticks these days? - white phosphorus
Which of the following undergoes spontaneous combustion? - white phosphorus
which of the following statement is not correct about carbondioxide acting as a fire extinguisher for electrical fires? - it is lighter than air
Fires in underground coalmines usually occur due to the: - spontaneous combustion
The calorific value of a fuel is 40000KJ/kg. This fuel is most likely to be: - biogas
Which of the following fuels has the highest calorific value? - hydrogen gas
On a cold winter night, the person sleeping in a room with closed door and windows with a coal fire burning inside may die due to the excessive accumulation of: - carbon monoxide
Which of the following burns without producing a flame? - coke
On a cold winter night, the persons sleeping in a room with closed door and windows with a coal fire burning inside may die to the excessive accumulation of: - CNG
Which of the following is the main cause of global warming? - carbon dioxide
Which of the following gas does not contribute to the formation of an acid rain? - carbon monoxide
Which of the following is the most environment friendly fuel to be used in automobiles? - natural gas
Which of the following does not involve a combustion reaction? - production of heat and light from hydrogen in the sun
A heap of green leaves is lying in one corner of a park. The green leaves in the heap burn with difficulty because: - they contain a lot of water.
If the clothes of a person working in the kitchen catch fire, then to extinguish the fire: - woolen blanket should be used to cover the burning clothes
The outermost zone of a candle flame is the: - hottest part
The flame of a kerosene oil lamp (or lantern) has: - three zones
A lot of dry powder of one of the following chemicals can be released over a fire to extinguished it. This chemical is: - baking soda
