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If a soap bubble expands, the pressure inside the bubble

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Important Questions on Properties of Bulk Matter

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A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball v as a function of time t is

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The velocity of a small ball of mass M and density ρ, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is ρ2, then the viscous force acting on the ball will be:
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A cup of coffee cools from 90°C to 80°C in t min, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is :
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Three stars A, B, C have surface temperatures TA, TB,TC  respectively. Star A appears bluish, star B appears reddish and star C yellowish. Hence,
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A liquid does not wet the solid surface if angle of contact is:
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A barometer is constructed using a liquid (density =760 kg m-3). What would be the height of the liquid column, when a mercury barometer reads 76 cm?

(density of mercury =13600 kg m-3)

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The quantities of heat required to raise the temperature of two solid copper spheres of radii r1 and r2r1=1.5 r2 through 1 K are in the ratio:
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A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is: