irrigation water resources engineering and hydrology MCQs – Page 5

Practise focused irrigation water resources engineering and hydrology questions with marked answers for exam preparation and subject revision.

irrigation water resources engineering and hydrology Mcqs
81. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by_____________?
comments icon0

A. (0.9)00

B. 1 (0.99)10

C. (0.99)10

D. l-(0.9)100

82. The main cause of meandering is________________?
comments icon0

A. degradation

B. the extra turbulence generated by the excess of river sediment during floods

C. presence of an excessive bed slope in the river

D. none of the above

83. Which of the following is a flexible outlet ?
comments icon0
A. Kennedys gauge outlet

B. submerged pipe outlet

C. none of the above

D. Gibbs outlet

84. The stream which does not have any base flow contribution is called________________?
comments icon0

A. none of the above

B. intermittent stream

C. ephemeral stream

D. perennial stream

85. The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?
comments icon0

A. Uplift

B. Water pressure

C. Pressure due to earthquake</strong>

D. correct answer is

E. Self weight

86. Seepage through embankments in an earthen dam is controlled by_______________?
comments icon0

A. provision of downstream berms

B. drainage filters

C. drain trenches

D. relief wells

87. A river training work is generally required when the river is_______________?
comments icon0

A. aggrading type

B. degrading type

C. meandering type

D. both (A) and (B)

88. A current meter is used to measure the__________________?
comments icon0
A. velocity of flow of water

B. depth of flow of water

C. discharge

D. none of the above

89. Generally the weir is aligned at right angles to the direction of the main river current because______________?
comments icon0

A. it is economical

B. all of the above

C. it ensures less length of the weir

D. it gives better discharging capacity

90. Rate of evaporation from a water surface increases if_________________?
comments icon0

A. correct answer is?

B. concentration of soluble solids in water is decreased</strong>

C. difference of vapour pressure between water and air is increased

D. velocity of wind is decreased

91. Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?
comments icon0
A. slope-area method

B. area-velocity method

C. ultra-sonic method

D. moving boat method

92. Tortuosity of a meandering river is the ratio of__________________?
comments icon0

A. meander belt to meander length

B. curved length along the channel to the direct axial length of the river reach

C. meander length to meander belt

D. direct axial length of the river reach to curved length along the channel

93. Instantaneous unit hydrograph is a hydrograph of________________?
comments icon0

A. correct answer is?

B. unit duration

C. unit rainfall excess

D. infinitely small rainfall excess</strong>

E. infinitely small duration

94. Select the correct statement?
comments icon0
A. A meander increases the river length but a cut off reduces the river length

B. A cutoff increases the river length but a meander reduces the river length

C. Both meander and cutoff increase the river length

D. Both meander and cutoff decrease the river length

95. The maximum permissible eccentricity for no tension at the base of a gravity dam is__________________?
comments icon0
A. B/6

B. B/3

C. B/4

D. B/2

96. To determine the discharge at a section in a stream from its rating curve, the required data are_______________?
comments icon0

A. stage at the section

B. correct answer is?

C. slope of water surface at the section

D. current meter readings at the section </strong>

97. In case of non-availability of space due to topography, the most suitable spillway is________________?
comments icon0

A. ogee spillway

B. chute spillway

C. shaft spillway

D. straight drop spillway

98. Infiltration is the_______________?
comments icon0
A. movement of water through the soil

B. absorption of water by soil surface

C. both (A) and (B)

D. none of the above

99. The net speed under which the turbine reaches its peak efficiency is called_________________?
comments icon0

A. operating speed

B. rated speed

C. gross speed

D. design speed
100. Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Laceys theory will be_________?
comments icon0

A. 76m

B. 19 m

C. 57m

D. 38m