Questions and answers for exam Preparation

MCQs

Total Questions : 43 | Page 4 of 5 pages

Question 31. The permeability of the aquifer is ________ if the drawdown is 4m, discharge is 40litres/sec, thickness of confined aquifer is 30m and the radius of the well is 0.1m. The radius of influence is taken as 245m.

36 m/day
30 m/day
26 m/day
20 m/day

Discuss Question

Answer: Option A. -> 36 m/day
Answer: (a).36 m/day

Question 32. The formula for the pumping out test in an unconfined aquifer is given by _________

\(k=\frac{qπ}{1.36(H^2-h^2)}log_{10}\frac{R}{r} \)
\(k=\frac{q}{1.36(H^2-h^2)}log_{10}\frac{R}{r} \)
\(k=\frac{q}{π(H^2-h^2)}log_{10}\frac{R}{r} \)
\(k=\frac{q}{1.36(H^2-h^2)} \)

Discuss Question

Answer: Option B. -> \(k=\frac{q}{1.36(H^2-h^2)}log_{10}\frac{R}{r} \)
Answer: (b).\(k=\frac{q}{1.36(H^2-h^2)}log_{10}\frac{R}{r} \)

Question 33. The drawdown, corresponding to a steady discharge, are observed at a number of wells in _______

pumping out test
pumping in test
constant head permeability test
falling head permeability test

Discuss Question

Answer: Option A. -> pumping out test
Answer: (a).pumping out test

Question 34. In a tube well of 20cm diameter in a soil with coefficient of permeability of 4.15*10¯⁴ m/s, drawdown is 4m and aquifer is 30m thick. If radius of influence is 245m, what is the discharge in each well?

0.033 m³/s
0.040 m³/s
0.036 m³/s
0.042 m³/s

Discuss Question

Answer: Option C. -> 0.036 m³/s
Answer: (c).0.036 m³/s

Question 35. The pumping-in test was devised by _________

U.S. Bureau of soil and PRA
U.S. Bureau of reclamation
Indian standard of Bureau
None of the mentioned

Discuss Question

Answer: Option B. -> U.S. Bureau of reclamation
Answer: (b).U.S. Bureau of reclamation

Question 36. Three tube wells of 20cm diameter each forming an equilateral triangle at distance 100m on side. The coefficient of permeability is 4.15*10¯⁴ m/s, drawdown is 4m and aquifer is 30m thick. If radius of influence is 245m, what is the discharge in each well?