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qUESTIONS

MCQs-PYQs-12th-jee

An open U-tube contains mercury. When 11.2 cm of water is poured into one of the arms of the tube, how height does the mercury rise in the other arm form its initial level

MCQs-PYQs-12th-jee

Air is blown through a hole on a closed pipe containing liquid. Then the pressure will

MCQs-PYQs-12th-jee

A triangular lamina of area A and height h is immersed in a liquid of density pin a vertical plane with its base on the surface of the liquid. The thrust on the lamina is

MCQs-PYQs-12th-jee

The pressure on a swimmer 20 m below the surface of water at sea level is

MCQs-PYQs-12th-jee

Density of ice is p and that of water is o. What will be the decrease in volume when a mass M of ice melts?

MCQs-PYQs-12th-jee

Two liquids of densities p₁ and rho_{2}(rho_{2} = 2rho_{1}) are filled up behind a square wall of side 10m as shown in figure. Each liquid has a height of 5m. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is (Assume that the liquids are not mixing):

MCQs-PYQs-12th-jee

The ratio of surface tensions of mercury and water is given to be 7.5 while the ratio of their densities is 13.6. Their contact angles with glass are close to 135° and 0° respectively. It is observed that mercury gets depressed by an amount h in a capillary tube of radius r, while water rises by the same amount h in a capillary tube of radius r2. The ratio (r₁/r2) is then close to

MCQs-PYQs-12th-jee

If ‘M’ is the mass of water the rises in a capillary tube of radius ‘r’, then mass of water which will rise in a capillary tube of radius ‘2r’ is

MCQs-PYQs-12th-jee

A soap bubble, blown by a mechanical pump at the mouth of a tube, increases in volume, with time, at a constant rate. The graph that correctly depicts the time dependence of pressure inside the bubble is given by

MCQs-PYQs-12th-jee

The following observations were taken for determining surface tension o of water by capillary method: diameter of capillary, D = 1.25 * 10 ^ – 2 rise of water, h = 1.45 * 10 ^ – 2 * m Using g = 9.8 * m / s ^ 2 and the simplified relation sigma = (mhg)/2 * 10 ^ 3 * Nm the possible error in surface tension is closest to

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