Fertilizers and Pesticides TNPSC Group 1 Questions

Chemistry

Fertilizers and Pesticides MCQ Questions

13.
The growing plants need which of the following elements in largest quantity?
A.
Calcium
B.
Nitrogen
C.
Ammonia
D.
Phosphorus
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ANSWER :
B. Nitrogen
14.
Rainwater helps to increase the __________ of the soil
A.
Phosphorus content
B.
nitrogen content
C.
calcium content
D.
potash content
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ANSWER :
B. nitrogen content
15.
the amount of nitrogen present in atmospheric air is
A.
58%
B.
78%
C.
98%
D.
68%
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ANSWER :
B. 78%
16.
Gammexane is the trade name of
A.
BHC
B.
DDT
C.
Urea
D.
Detergent
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ANSWER :
A. BHC
17.
Which one of the following is used to kill rat
A.
red phosphorus
B.
white phosphorus
C.
Phosphine
D.
Carborundum
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ANSWER :
A. white phosphorus
18.
Copper sulphate is used as
A.
Food preservative
B.
Fungicide
C.
Mordant
D.
Reducing agent
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ANSWER :
B. Fungicide