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56. Percentage of oxygen in the troposphere is
A. 79
B. 0.03
C. 20
D. Trace
Explanation:
57. Vibrations of a vibrating body per second is termed
A. Joule
B. Decibel
C. Frequency
D. Moles
Explanation:
58. An example of a degradable pollutant is
A. Ceramics
B. Plastics
C. Domestic sewage
D. PVC materials
Explanation:
59. Prolonged exposure of man to unpleasant noises leads to
A. Mental disturbance
B. Violent behavior
C. Consumption of tranquilizers
D. All the three
Explanation:
60. Noise pollution aggravates
A. Peptic ulcer
B. Asthma
C. Peptic ulcer and Asthma
D. Jaundice
Explanation:
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