51. When fluoride concentration in H₂O exceeds about 1.5 mg/l. the disease that may be caused, is
- (A) Dental caries in children
- (B) Fluorosis
- (C) Polymyelitis
- (D) Methemoglobinemia
Answer:
Explanation:
Exposure to excessively high concentrations of fluoride in water can lead to a condition called fluorosis, which affects teeth and bones.
52. Forest and wild life are
- (A) Renewable resource
- (B) Non-renewable resources
- (C) Inexhaustible resources
- (D) None of these
Answer:
Explanation:
Forests and wildlife are considered renewable resources because they can regenerate over time, though they require sustainable management.
53. Nitrogen constitutes about 78% of the atmosphere
- (A) By weight
- (B) By mass
- (C) By volume
- (D) None of these
Answer:
Explanation:
The composition of gases in the atmosphere is typically measured by volume. Nitrogen makes up about 78% of the air by volume.
54. The Wildlife (Protection) Act was enacted in the year:
- (A) 1986
- (B) 1974
- (C) 1994
- (D) 1972
Answer:
Explanation:
The Wildlife (Protection) Act was enacted by the Parliament of India in 1972 for the protection of plants and animal species.
55. The functions of Central Board are given under:
- (A) Section 16
- (B) Section 19
- (C) Section 25
- (D) Section 24
Answer:
Explanation:
The functions of the Central Pollution Control Board are detailed under Section 16 of both the Water Act of 1974 and the Air Act of 1981.
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