Q1. Which of the following is not favourable for the formation of deltas?
(a) Calm winds
(b) Currents and tides
(c) Sheltered coast
(d) No large lakes in the river course
(UPSC Prelims 1983)
Answer: (b) Currents and tides
Explanation: Strong currents and tides disrupt the deposition of sediments, which is essential for delta formation. Deltas form best in calm, sheltered coastal areas where sediment can accumulate undisturbed.