154) The normal stress is same in all directions at a point in a fluid

Answer is:

when there is no motion of one fluid layer relative to an adjacent layer

Fluid Mechanics MCQ with Answers

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155) Select the correct statement

Local atmospheric pressure depends upon elevation of locality only

Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

Local atmospheric pressure is always below standard atmospheric pressure

A barometer reads the difference be-tween local and standard atmospheric pressure

Answer is:

Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

156) For measuring flow by a venturimeter, it should be installed in

Answer is:

in any direction and in any location.

Explanation:

Venturimeter is an instrument used to measure the discharge of liquid flowing in a pipe. Venturimeter consists of three parts
1. Convergent cone
2. Throat
3. Divergent cone
The length of divergent cone is made about three to four times longer than that of the divergent cone in order to avoid tendency of breaking away the stream of liquid and to minimise frictional losses.
For measuring flow by a venturimeter, it can be installed in any direction and in any location.