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1.
We have two (narrow) capillary tubes 
and 
. Their lengths are 
and 
and radii of cross-section are 
and 
respectively. The rate of flow of water under a pressure difference 
through tube is 
. If 
and 
, what will be the rate of flow when the two tubes are connected in series and pressure difference across the combination is same as before 
and . Their lengths are and and radii of cross-section are and respectively. The rate of flow of water under a pressure difference through tube is . If and , what will be the rate of flow when the two tubes are connected in series and pressure difference across the combination is same as before
2.
A horizontal pipe of cross-sectional diameter 5 cm carries water at velocity of 
. The pipe is connected to a smaller pipe with a cross-sectional diameter 4 cm. the velocity of water through the smaller pipe is
. The pipe is connected to a smaller pipe with a cross-sectional diameter 4 cm. the velocity of water through the smaller pipe is
3.
A vessel, whose bottom has round holes with diameter 0.1 mm is filled with water. The maximum height upto which water can be filled without leakage is (Surface tension = 
and 
)
and )
4.
Two pieces of glass plate one upon the other with a little water in between them cannot be separated easily because of
5.
Two rain drops falling through air have radii in the ratio 1:2. They will have terminal velocity in the ratio