Buoyancy and floatation MCQ Questions- Mechanicaltalks

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Buoyancy and floatation

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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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The floating body is said to be in neutral equilibrium if the metacentre is above the centre of gravity.

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A uniform body of size 4 m long, 2.5 m wide and 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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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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The principle of floatation of bodies is based on the premise of

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Which of the following cannot be the value of absolute pressure of a fluid at any point?

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

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

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

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

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In a stationary fluid, how does the local pressure of the fluid vary?

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

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

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When body is completely or partially immersed in a fluid, how much its weight be distributed for it to be in stable equilibrium.

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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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A manometric liquid should suitably have

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The floating body is said to be in stable equilibrium if the metacentre is below the centre of gravity.

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In stable equilibrium for completely submerged bodies what is the relation between forces?

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Proper explanation for metacentre is:

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

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If the magnitude of dimension of a rectangular wooden block is length>breadth>height, then for it to float on the water, it should be immersed in what manner?

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

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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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