Physics MCQs:

1)    A tube tapers from 20cm diameter to 2cm the velocity at first cross-section is 5cms^-1 , then velocity at second cross-section is

a)     5000 cms^-1

b)    500 cms^-1

c)     50 cms^-1

d)    5 cms^-1

2)    A cylinder is filled with non-viscous liquid of density ‘p’ to a height h_o  and a hole is made at a height h from the bottom of the cylinder. The velocity of liquid issuing of the hole is

a)     (2gh₀) ^½   

b)    [2g(h₀-h)] ^½

c)     [2g(h-h₀) ]^½

d)    None of these

3)    Surface tension is due to

a)     Intermolecular attractions

b)    Intramolecular attractions

c)     Intramolecular repulsions

d)    Intermolecular attractions

1.b

2.b

3.a