221) A flow through a long pipe at decreasing rate is called __________ uniform flow.

steady

unsteady

zero

none of these

Answer is:

unsteady

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222) The surface tension of mercury at normal temperature is __________ that of water.

same as

lower than

higher than

none of these

Answer is:

higher than

223) The property of a liquid which enables it to resist tensile stress is called its surface tension.

Agree

Disagree

Can't Say

None

Answer is:

Agree

Explanation:

Surface tension is the property of a liquid which enables it to resist tensile stress. Surface tension is denoted by σ (sigma). Surface tension is expressed in N/m (Newton/meter).

224) The magnitude of water hammer depends upon the

elastic properties of the pipe material

elastic properties of the liquid flowing through the pipe

speed at which the valve is closed

all of the above

Answer is:

all of the above

225) The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.

plus

minus

zero

none of these

Answer is:

plus

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