Questions and answers for exam Preparation

MCQs

Total Questions : 440 | Page 1 of 44 pages

Question 1.

Ryve's formula for flood estimate in cumecs, is

`Q = CA^(3//4)`
`Q = CA^(2//3)`
`Q = CA^(1//2)`
`Q = CA^(1//4)`

Discuss Question

Answer: Option B. -> `Q = CA^(2//3)`

Question 2.

If `omega` is unit weight of water, Q the discharge in cumecs, H the total head lift and `eta`, the efficiency of the pump, the H.P. of the motor is

`H.P = (omega Q H)/( 75 eta)`
`H.P = (omega Q H)/( 4500 eta)`
`H.P = (omega Q eta)/( 75 H)`
`H.P = (omega Q eta)/( 4500 H)`

Discuss Question

Answer: Option A. -> `H.P = (omega Q H)/( 75 eta)`

Question 3.

The
coefficients of permeability of soils of an unconfined aquifer and
another confined aquifer were determined by pumping water from the wells
and observing the effect of water table in two test wells at equal
distances was found to be equal. The total height of confined aquifer H is given by

`H = h_2 - h_1`
`H = h_1 - h_2`
`H = h_2+ h_1`
`1/2 (h_1+ h_2)`

Discuss Question

Answer: Option D. -> `1/2 (h_1+ h_2)`

Question 4.

The formula for calculating the overland flow time (T_o) in hours for any basin, is (where L_o is the distance of the critical point and H is the difference in elevation)

`T_0 = (0.225 L_0^3/H)^0.385`
`T_0 = (0.665 L_0^3/H)^0.385`
`T_0 = (0.435 L_0^3/H)^0.385`
`T_0 = (0.885 L_0^3/H)^0.385`

Discuss Question

Answer: Option D. -> `T_0 = (0.885 L_0^3/H)^0.385`

Question 5.

The rational formula for calculating the discharge, is (where A is the area of basin and P_o is one hour rainfall)

`(1/12) K.P_0 ((1)/(1 + T_e)). A`
`(1/24) K.P_0 ((2)/(1 + T_e)). A`
`(1/36) K.P_0 ((2)/(1 + T_e)). A`
`(1/48) K.P_0 ((1)/(1 + T_e)). A`

Discuss Question

Answer: Option C. -> `(1/36) K.P_0 ((2)/(1 + T_e)). A`

Question 6. According to Robert E. Horton, the equation of infiltration capacity curve, is (where letters carry their usual meanings)

Discuss Question

Answer: Option C. -> C
Answer: (c).C

Question 7. If s is the potential infiltration, P is rainfall in cm in a drainage of a soil with fair pasture cover, the direct run off Q in cm is given by

Discuss Question

Answer: Option C. -> C
Answer: (c).C

Question 8. Burge formula given by the following equation cumecs is based upon

rainfall and drainage area
run off and drainage area
drainage area and its shape
drainage area

Discuss Question

Answer: Option C. -> drainage area and its shape
Answer: (c).drainage area and its shape

Question 9. In the derivation of Thiem's formula given by following equation, the following assumption is not applicable

The aquifer is homogeneous and isotropic
Flow lines are radial and horizontal
The slope of the water surface is too small
The well has been sunk up to the surface of the unconfined aquifer

Discuss Question

Answer: Option D. -> The well has been sunk up to the surface of the unconfined aquifer
Answer: (d).The well has been sunk up to the surface of the unconfined aquifer

Question 10. With the usual meanings of letters, the following equation is used for determining the velocity of ground water flow in metres per day. It is known as