Q. A student wants to find the absolute pressure of water at a point below the surface of water. He has a barometer and a manometer pressure gauge. The barometer reads 1.3152 bar where as the manometer pressure gauge reads 0.3152 bar. What is the absolute pressure? (Assume that pressure at one end of the manometer is atmospheric.)

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Q. In a U-tube manometer, one end is open to the atmosphere, the other end attached to a pressurized gas of gauge pressure 40 kPa. The height of the fluid column in the atmospheric side is 60 cm, and that on the gas side is 30 cm. The manometic fluid used is: (Take g = 9.8 m/s²).

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Q. In a U-tube mercury manometer, one end is exposed to the atmosphere and the other end is connected to a pressurized gas. The gauge pressure of the gas is found to be 40 kPa. Now, we change the manometric fluid to water. The height difference changes by: (ρmercury = 13600 kg/m³, ρwater = 1000 kg/m³).

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Q. A manometric liquid should suitably have _________

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Q. A simple U-tube manometer can measure negative gauge pressures.

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Q. Both ends of a U-tube manometer are exposed to the atmosphere. There exists a possibility that the height difference of the manometer is non-zero. True or False?

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Q. Find the position of centre of buoyancy for a wooden block of width 3.5 m and depth 1 m, when it floats horizontally in water. The density of wooden block id 850 kg/m³ and its length 7.0 m.

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Q. A stone weighs 450 N in air and 200 N in water. Compute the volume of stone.

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Q. A stone weighs 650 N in air and 275 N in water. Compute its specific gravity.

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Q. A body of dimensions 2.7 m * 3.8 m * 2.5 m, weighs 2500 N in water. Find its weight in air.

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Q. Find the density of metallic body which floats at the interface of mercury of sp.gr 13.6 and water such that 40 % of its volume is sub-merged in mercury and 60% in water.

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Q. What is the principal cause of action of buoyant force on a body submerged partially or fully in fluid?

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Q. How can relatively denser object be made to float on the less dense fluid?

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Q. What happens to the buoyant force acting on the airship as it rises in the air?

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Q. As a balloon rises in the air its volume increases, at the end it acquires a stable height and cannot rise any further.

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Q. Submarines use principle of ‘neutral buoyancy’ to go into the water.

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Q. A rectangular pontoon is 5 m long, 3 m wide and 1.40 m high. The depth of immersion of the pontoon is 0.60 m in seawater. If the centre of gravity is 0.7 m above the bottom of the pontoon, determine the metacentric height. The density for seawater = 1045 kg/m³.

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Q. A uniform body of size 4 m long * 2.5 m wide * 1.5 m deep floats in water. What is the weight of the body if depth of immersion is 1 m ?

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Q. A block of material of specific gravity 0.45 floats in water. Determine the meta-centric height of the block if its size is 3 m * 2 m* 0.8 m.

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Q. A solid cylinder of diameter 4.5 has a height of 2.5 metres. Find the meta-centric height of the cylinder when it is floating in water with its axis vertical. The sp. gr. of the cylinder=0.45.

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