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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Q. In case of spherically shaped bodies of uniform mass distribution and completely immersed in fluid and floating, the centre of buoyancy coincides with centre of gravity.

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Q. Proper explanation for metacentre is:

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Q. The metacentric height is affected by the change in density.

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Q. or a completely immersed body, the metacentric height is always zero.

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Q. Meta centre always lies below the centre of gravity

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