State whether the following statements are true or false.

An object float or sink when placed on the surface of water.

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True

False

answer is A.

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Detailed Solution

The given statement is true.
Concept- Use the Archimedes Principle. When a body is immersed in the liquid or placed on its surface, it exerts a force. This resultant force is directed upward. If the density of an object is greater than the density of the liquid, the object sinks. This is due to the fact that an object's weight is greater than the buoyant force acting on the object. If the density of the object is more than the density of the liquid, the object sinks into the liquid; if the density of the object is less than the density of the liquid, the object floats on the liquid's surface. This occurs because when a body is immersed in water, the liquid exerts a buoyant pull on that body. Archimedes Principle asserts that "the upward buoyant force exerted on a body immersed in a fluid, whether partially or totally submerged, is equal to the weight of the fluid that the body displaces and operates in."
the upward direction at the displaced fluid's centre of mass." This upward buoyant force is known as 'thrust.' When we join a swimming pool or a river to swim, we experience a sense of weightlessness due to the thrust exerted by the water. The entire force felt by an object is defined as its weight. There are primarily two forces at work in liquids: gravitational force and buoyant force (thrust) . The difference between these two forces is an object's apparent weight. Gravitational force – buoyant force = apparent weight (Thrust)
Hence, the given statement is true.

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