Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds?

  1. Decreased salinity in the river
  2. Pollution of groundwater
  3. Lowering of the water-table

Select the correct answer using the code given below.

[UPSC Civil Services Exam – 2018 Prelims]

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3


Answer: (b)        

Explanation:

  • Heavy sand mining in riverbeds leads to the increase of velocity of the flowing water, thereby eventually erode the river banks.
  • Sand aquifer helps in recharging the water table; its progressive depletion in the river is accompanied by the lowering of the water table in the nearby areas.
  • As the turbidity increases at the mining site, saline water intrusion takes along the coastal aquifers thereby polluting the ground water.
  • It also leads to an imminent danger of saline water ingress into fresh water. Hence, Statement 1 is not correct.

Consider the following statements:                                                                   The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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Consider the following statements:                                                         The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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