120. When a constant discharge 2.91 litres/sec. was obtained in a pumping test, the draw downs in the test wells at 3 m and 6.184 m were 2.6 m and 0.3 m respectively. If over-all depth of the pumping well was 16 m, the permeability of the soil, is

A. 0.0005 cm/sec _

B. 0.001 cm/sec

C. 0.002 cm/sec

D. 0.01 cm/sec.

121. A well is sunk in an unconfined aquifer having a saturated depth of 100 m. Assuming the equilibrium flow

A. 2/3

B. 5/4

C. 4/5

D. 8/7.

122. A well penetrates to 30 m below the static water table. After 24 hours of pumping at 31.40 litres/minute, the water level in a test well at a distance of 80 m is lowered by 0.5 m and in a well 20 m away water is lowered by 1.0 m. The transmissibility of the auifer, is

A. 1.185 m2/minute

B. 1.285 m2/minute

C. 1.385 m2/minute

D. 1.485 m2/minute

123. Shrouding is provided in

A. cavity type tube wells

B. slotted type tube wells

C. strainer type tube wells

D. perforated type tube wells,

124. The efficiency of a pump may be taken as

A.0.55

B.0.6

C.0.65

D. 0.70.

125. If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as

A. 0.01 h

B. 0.45 h

C. 0.20 h

D. 0.25 h

126. If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as

A. 0.10 m

B. 0.20 m

C. 0.5 m

D. 1.0 m.

Page **18** of **21**