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Environment In Relation To Human Welfare - Questions and Answers

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61. The unit of sound is
A. Frequency
B. Calorie
C. Decibel
D. Moles
Explanation:
62. The sub-soil water gets polluted due to
A. Insecticides and pesticides
B. Ceramics and plastics
C. Mercuric chloride and PVC
D. Aluminium cans and plastics
Explanation:
63. Any unpleasant and unwanted sound dumped into atmosphere and causing adverse effect is
A. Air pollution
B. Noise pollution
C. Land pollution
D. Water pollution
Explanation:
64. Permissible levels of noise recognized by Industrial Noise Survey of India is
A. 61 to 100 dB
B. 71 to 110 dB
C. 81 to 120 dB
D. 91 to 130 dB
Explanation:
65. Soil fertility and life of soil microbes are affected by
A. Domestic sewage
B. Plastics
C. Detergents
D. Ceramics
Explanation:
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