71. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm2, the pressure at a depth of 50 m below the oil surface will be
72. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm2. The pressure at 2.5 m below the oil surface will be
73. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
74. The hydraulic grade line is
75. During the opening of a valve in a pipe line, the flow is
76. A balloon lifting in air follows the following principle
77. Choose the wrong statement
78. In a forced vortex motion, the velocity of flow is
79. When the flow parameters at any given instant remain same at every point, then flow is said to be
80. The atmospheric pressure with rise in altitude decreases
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