Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly (surface tension of soap solution = 0.03 Nm^{-1} )

(A)

4 mJ

(B)

0.2 mJ

(C)

2 mJ

(D)

0.4 mJ

Question-2

One large soap bubble of diameter D breaks into 27 bubbles having surface tension T. The change in surface energy is

(A)

(B)

(C)

(D)

Question-3

Bernoulli's equation is an example of conservation of

(A)

energy

(B)

momentum

(C)

angular momentum

(D)

mass

Question-4

In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from

(A)

Pascal's law

(B)

Stokes's law

(C)

Bernoulli's principle

(D)

Archimedes' principle

Question-5

Two capillaries of some materials are dipped into a liquid. If the height of liquid risen in them are 2.2 cm and 6.6 cm then the ratio of their radii is

(A)

3 : 1

(B)

1 : 3

(C)

9 : 1

(D)

1

Question-6

A sheet of brass is 50 cm long and 10 cm broad at 0^{o} C. The area of the surface increases by 1.9 cm^{2} at 100^{o} C. The coefficient of linear expansion of brass is

(A)

(B)

(C)

(D)

Question-7

Two capillaries of lengths L and 2 L and of radii R and 2 R respectively are connected in series. The net rate of flow of fluid through them will (Given, rate of the flow through single capillary, ) be

(A)

(B)

(C)

(D)

Question-8

The ratio of the terminal velocities of two drops of radii R and R/2 is

(A)

2

(B)

1

(C)

1/2

(D)

4

Question-9

The rate of flow of liquids in a tube of radius r, length l, whose ends are maintained at a pressure difference P is

where η is coefficient of viscosity and Q is

(A)

8

(B)

1/8

(C)

16

(D)

1/16

Question-10

A capillary tube when immersed vertically in a liquid records a rise of 3.0 cm. If the tube is half immersed in the liquid at an angle of 60^{o} with the vertical, the length of the liquid column along the tube will be :

(A)

1.5 cm

(B)

3.0 cm

(C)

(D)

6.0 cm

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