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1.

Water is coming out of a hole made in the wall of tank filled with fresh water. If the size of the hole is increased, will the velocity of efflux change?  

Answer»

Velocity of efflux V = √2gh, Since the velocity of efflux is independent of area of hole, it will remain the same. 
Discussion
2.

The accumulation of snow on an aero plane wing may reduce the lift. Explain? 

Answer»

Due to the accumulation of snow on the wings of the aero plane, the structure of wings no larger remains as that of aerofoil. As a result, the net upward force (i.e. lift) is decreased. 
Discussion