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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
6.
In which one of the following cases will the liquid flow in a pipe be most streamlined
7.
Eight drops of a density 
and each of radius 
are falling through air with a constant velocity 
. When the eight drops coalesce to from a single drop the terminal velocity of the new drop will be
and each of radius are falling through air with a constant velocity . When the eight drops coalesce to from a single drop the terminal velocity of the new drop will be
8.
An inverted bell lying at the bottom of a lake 
deep has 
of air trapped in it. The ball is brought to the surface of the lake. The volume of the trapped air will be (atmospheric pressure 
of 
and density of 
)
deep has of air trapped in it. The ball is brought to the surface of the lake. The volume of the trapped air will be (atmospheric pressure of and density of )
9.
The relative velocity of two parallel layers of water is 
. If the perpendicular distance between the layers is 0.1 cm, then velocity gradient will be
. If the perpendicular distance between the layers is 0.1 cm, then velocity gradient will be
10.
The fraction of a floating object of volume 
and density 
above the surface of a liquid of density 
will be
and density above the surface of a liquid of density will be