Archimedes' Principle

Which best describes the buoyant force?

• The upward force of a fluid

• The weight of the object

• The volume of the fluid displaced

• The downward force of a fluid

• The total weight of the fluid

A block of wood weighs 160N and has a specific gravity of 0.60. To sink it in fresh water requires an additional downward force of:

• 54N

• 64N

• 96N

• 110N

Tags

NGSS.MS-PS2-2

A 0.50-N metal sinker appears (as measured using a spring scale) to have a weight of 0.45N when submerged in water. The specific gravity of the metal is:

• 6

• 8

• 9

• 10

• 12

An object weighing 5 N in air, weighs 4.5 N a liquid. The buoyant force experienced by the object is :

• (5 + 4.5) N

• 4.5/5 N

• 5/4.5 N

• 0.5 N

The same body is immersed in two liquids A and B in succession. The extent to which the body sinks in liquid B is less then in liquid A. What are the conclusions that could be derived from such an observation

• The density of liquid A is more then B

• The density of liquid B is more then A

• The density of solid is less then the liquid in both

• No such conclusion can be made

The sea water is denser than fresh water due to

• Mixing of sand

• Stagnation

• Mixing of salts

• Evaporation

While measuring the volume displaced by a solid inside a liquid in a measuring jar, which of the following methods should be adopted?

• As in fig. (III) the solid should be partially immersed in the liquid in the jar.

• As in fig. I the solid should be well inside the liquid.

• Just rest at the surface of liquid in jar as in fig. (IV)

• As in fig.(II) the solid should be inside the liquid resting at bottom of the jar.

A packet of 400 g and volume 200 cm3 is put in a water tank. The relative density of packet is

• 2

• 4

• 200

• 400

An object of weight 500 N is floating in a liquid. The magnitude of buoyant force acting on it is

• 500

• 400

• 200

• 100

If relative density is 11.3, the density of the substance in SI units is

• 11.3 g/cm3

• 11.3 kg/m3

• 11.3 x 103 kg/m3

• 11.3 x 103 g/cm3