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1.The charcoal use to decolourise raw sugar is
animal charcoal
sugar charcoal
coconut charcoal
wood charcoal
2.The most abundant metal in the earth’s crust is
zinc
copper
aluminium
iron
3.Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
Television
Tube light
Cooking gas
Refrigerator
4.The gas used to extinguish fire, is
neon
nitrogen
carbon dioxide
carbon monoxide
5. In which of the following activities silicon carbide is used?
Making cement and glass
Disinfecting water of ponds
Making casts for statues
Cutting very hard substances
6. The element common to all acids is
carbon
hydrogen
oxygen
sulphur
7. Gobar gas contains mainly
methane
carbon dioxide
butane
carbon monoxide
8.The most malleable metal is
Silver
Gold
Aluminium
Sodium
9.Tetraethyl lead is used as
mosquito repellent
painkiller
fire extinguisher
petrol additive
10.Which of the following is used in beauty parlours for hair setting?
Chlorine
Sulphur
Phosphorus
Silicon
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