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Why is it difficult to breathe at higher altitudes?
1).Due to low air pressure
2).Due to low temperature
3).Due to ozone
4).Due to high humidity

Natural rubber is the polymer of:
1). isoprene
2). Styrene
3). Butadiene
4). Ethylene

Which of the following is used for refrigeration?
1). Sulphur dioxide
2). Chlorine
3). Freon
4). Phosphine

The drugMarijuanais a
1). sedative
2). mental stimulant
3). hallucinating substance
4). tranquillizer

Galena is a mineral of
1). Iron
2). gold
3). lead
4). calcium

Which of the following is ozone depleting pesticide ?
1). D.D.T.
2). Benzene
3). Methyl bromide
4). Ethylene ozonide

Hydrogen bomb is based on the principle of
1). controlled fission reaction
2). uncontrolled fission reaction
3). controlled fusion reaction
4). uncontrolled fusion reaction

If all bullets could not be removed from gunshot injury of a man it may cause poisoning by
1). Mercury
2). Lead
3). Iron
4). Arsenic

Water gas is the mixture of
1). carbon dioxide and hydrogen
2). carbon monoxide and nitrogen
3). carbon monoxide and hydrogen
4). carbon dioxide and nitrogen

Mortar is a mixture of water sand and
1). Slaked lime
2). Quick lime
3). Limestone
4). Gypsum

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