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This mock test of Test: Archimedes Principle for Class 9 helps you for every Class 9 entrance exam.
This contains 15 Multiple Choice Questions for Class 9 Test: Archimedes Principle (mcq) to study with solutions a complete question bank.
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QUESTION: 1

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

Solution:

The buoyant force experienced by the object is:- The buoyant force is in opposite direction to the weight of the object. Hence, if the object weighs 4.5 N in liquid then 0.5 N buoyant force will act on the object.

QUESTION: 2

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

Solution:

The density of liquid B is more than the liquid A as more upthrust is exerted on the body in liquid B and hence it sinks less.

QUESTION: 3

A sample of milk diluted with water has a density of 1040 kgm^{-3} . If pure milk has a density of 1080 kgm^{-3}. The percentage of water by volume in milk is

Solution:

Density of pure milk = 1080 Kg /m³

1080 kg / m³ = 100% pure milk

Density of diluted milk = 1032 kg / m³

1032 Kg/m³ = ? % of milk

1032 x 100/1080 = 95.56% of milk

Thus, the percentage of water by volume in milk is 100 – 95.56 = 4.44%

QUESTION: 4

A student lowers a body in a liquid filled in a container. He finds that there is a maximum apparent loss in weight of the body when

Solution:

QUESTION: 5

The density of copper is 9 g/cm^{3}. Then the volume of 90 g copper is

Solution:

Density of copper = 9 gm/cm^3

Mass of copper = 90 g

We know; Density = mass / volume

⇒ volume = mass / density

⇒ 90 / 9

⇒ Volume = 10 cm^{3}

QUESTION: 6

The sea water is denser than fresh water due to

Solution:

QUESTION: 7

Instrument used for measuring the density or relative density of liquids is known as

Solution:

QUESTION: 8

A packet of 400 g and volume 200 cm^{3} is put in a water tank. The relative density of packet is

Solution:

QUESTION: 9

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

Solution:

As we know that the buoyant force acting on a floating body in a liquid is equal to the weight of the floating body,

Buoyant force acting on the body of weight 200N floating in liquid = 200N

QUESTION: 10

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

Solution:

QUESTION: 11

If the density of the object placed in a liquid is equal to the density of the liquid, the object will:

Solution:

If the density of the object placed in liquid is equal to the density of the liquid, then :- It would float submerged in the liquid. Some part of the solid would be above the liquid surface and part would be inside the liquid surface.

QUESTION: 12

The mass of water displaced by a solid of mass 400 g and volume 150 cm^{3} is

Solution:

QUESTION: 13

Three objects A, B, and C having density 1.12 g cm^{-3}, 0.92 g cm^{-3} and 2.02 g cm^{-3 }respectively, are placed in a water tank. Which object will sink in water tank?

Solution:

QUESTION: 14

When a solid body is fully immersed in a liquid, the volume of the displaced liquid is:

Solution:
According to Archimedes’ principle, the volume of liquid displaced is equal to the volume of the solid.

QUESTION: 15

If we want to determine the volume of a solid by immersing it in water, the solid should be

Solution:

It should be heavier than water and insoluble in it, so that it sinks and displaces the water and also it does not mix in the water.

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