Hydrology and Ground Water

81. In India the recording type rain gauge generally used, is

1. Weighing type
2. Tipping type
3. Float recording type
4. None of these

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82. In India, rain fall is generally recorded at

1. 8 A.M.
2. 12 Noon
3. 4 P.M.
4. 8 P.M.

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83. In India, which of the following is adopted as standard recording rain-gauge?

1. Symon's rain-gauge
2. Tipping bucket type
3. Natural syphon type
4. Weighing bucket type

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84. In nature water may occur as

1. Liquid
2. Solid
3. Vapours
4. All the above

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85. In the derivation of Thiem's formula, Q =2πT(S₁ - S₂)/[2.3 log₁₀(r₂/r₁)] the following assumption is not applicable

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

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86. In the estimate of design flood, Dickens assumes that high flood in cumecs, is proportional to catchment area raised to the power

1. 43556
2. 43497
3. 43558
4. 43526

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87. Indian Meteorological department uses the standard gauges whose collectors have apertures of

1. 50 or 100 sq. cm area
2. 100 or 150 sq. cm area
3. 100 or 200 sq. cm area
4. 250 or 500 sq. cm area

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88. Infiltration capacity of soil depends upon

1. Number of voids present in the soil
2. Shape and size of soil particles
3. Arrangement of soil particles
4. All the above

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89. While calculating the average depth of annual precipitation in a catchment basin, importance to individual rain-gauge station is given in

1. Arithmetical method
2. Thiessen's mean method
3. Isohyetal method
4. Both (b) and (c)

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90. With the usual meanings of letters, the equation V = 400 I (D10²/4) is used for determining the velocity of ground water flow in metres per day. It is known as

1. Meinzer's formula
2. Slichter's formula
3. Darcy's formula
4. Hazen's formula

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