If two soap bubbles of different radii are connected by a tube,

(A)

air flows from the bigger bubble to the smaller bubble till the sizes become equal

(B)

air flows from bigger bubble to the smaller bubble till the sizes are interchanged

(C)

air flows from the smaller bubble to the bigger

(D)

there is no flow of air

Question-2

A water fountain on the ground sprinkles water all around it. If the speed of water coming out of the fountain is v, the total area around the fountain that gets wet is

(A)

(B)

(C)

(D)

Question-3

A hemispherical portion of radius R is removed from the bottom of a cylinder of radius R. The volume of the remaining cylinder is V and mass M. It is suspended by a string in a liquid of density , where it stays vertical. The upper surface of the cylinder is at a depth h below the liquid surface. The force on the bottom of the cylinder by the liquid is

(A)

Mg

(B)

(C)

(D)

Question-4

Water from a tap emerges vertically downwards with an initial speed of 1.0 ms^{-1} . The cross-sectional area of the tap is 10^{-4} m^{2}. Assume that the pressure is constant throughout the stream of water, and that the flow is steady. The cross-sectional area of the stream 0.15 m below the tap is

(A)

5.0×10^{-4} m^{2}

(B)

1.0×10^{-5} m^{2}

(C)

5.0×10^{-5} m^{2}

(D)

2.0×10^{-5} m^{2}

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

When the temperature is increased, the angle of contact of a liquid

(A)

increases

(B)

decreases

(C)

remains the same

(D)

first increases and then decreases

Question-7

A wooden block is taken to the bottom of a deep, calm lake of water and then released. It rises up with a

(A)

constant acceleration

(B)

decreasing acceleration

(C)

constant velocity

(D)

decreasing velocity

Question-8

A 15 cm x 6 cm x 0.1 cm slide suspended with its longest side vertical. 10% part of this slide is dipped into the water. In this state its apparent weight is equal to its real weight. The surface tension of water will be :

(A)

72.3 N/m

(B)

(C)

723 N/m

(D)

Question-9

The potential energy possessed by a soap bubble, having surface tension equal to 0.04 Nm^{-1} of diameter 1 cm, is

(A)

2× 10^{-6} J

(B)

4× 10^{-6} J

(C)

6× 10^{-6} J

(D)

8× 10^{-6} J

Question-10

Which one is not a dimensional number ?

(A)

Acceleration due to gravity

(B)

Surface tension of water

(C)

Velocity of light

(D)

Reynold's number

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