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1.
An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will
2.
In the figure, the velocity 
will be
will be
3.
A horizontal pipe of non-uniform cross-section allows water to flow through it with a velocity 
when pressure is 50 kPa at a point. If the velocity of flow has to be 
at some other point, the pressure at that point should be
when pressure is 50 kPa at a point. If the velocity of flow has to be at some other point, the pressure at that point should be
4.
The height of a mercury barometer is 
at sea level and 
at the top of a hill. Ratio of density of mercury to that of air is 
. The height of the hill is
at sea level and at the top of a hill. Ratio of density of mercury to that of air is . The height of the hill is
5.
An aeroplane of mass 
kg and total wing area of 
is in a level flight at some height. The difference in pressure between the upper and lower surface of its wings in kilo pascals is 
kg and total wing area of is in a level flight at some height. The difference in pressure between the upper and lower surface of its wings in kilo pascals is