The calorific value of fuel is expressed in
joule
kJ/kg
kJ
none of the above
B.
kJ/kg
The burning of candle is an example of
spontaneous combustion
rapid combustion
slow oxidation
explosion
Which of the following causes acid rain ?
carbon dioxide
sulphur dioxide
carbon monoxide
oxides of sulphur and nitrogen
The zone of the candle flame which is moderately hot is called
non-luminous zone
luminous zone
inner dark zone
lowest blue zone
Which of the following is not used for putting out fires from electrical gadgets ?
sand
water
foam
carbon dioxide