Tag: physics

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Questions Related to physics

Multiple choice archimedes' principle fluid pressure properties of matter physics

A body of mass 400 g has a volume of 300 cm$^3$. Will body sink in water or not? [Density of water = 1000 kg/m$^3$]

  1. Sink

  2. Float

  3. Sink partly

  4. Float partly
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Given :     Density of water     $\rho _w = 1000$ $kg/m^3  = 1$ $g/(cm)^3$
Density of body        $\rho _s = \dfrac{M}{V} = \dfrac{400}{300} = 1.33$  $g/(cm)^2$
$\implies$     $\rho _s >\rho _w$
Thus the body will sink in water.
Multiple choice archimedes' principle fluid pressure properties of matter physics

A slid floats in a liquid in a partially dipped position.

  1. The solid exerts a force equal to its weight on the liquid

  2. The weight of the displaced liquid equals the weight of the solid

  3. The liquid exerts a force of buoyancy on the solid which is equal to the weight of the solid

  4. The weight of the dipped part of the solid is equal to the weight of the displaced liquid
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

The force that solid exerts on liquid is its weight. Hence option A is correct.
Since the solid is stationary, the weight of solid is equal to the force exerted on it by liquid.
According to Archimedes' Principle, the buoyant force acting upwards on the solid is equal to the weight of the liquid displaced. Hence option B and C are correct.

Multiple choice archimedes' principle fluid pressure properties of matter physics

A balloon lifting in air follows:

  1. Law of gravitation

  2. Archimedes principle

  3. Laws of motion

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In a lifting balloon, force of gravitation acts downwards as on all other materials present on the earth, given by $mg$.

Also Archimedes' principle acts on the balloon to provide a buoyant force $V\rho g$ upwards, and greater in magnitude than the gravitational force downwards. (Where $\rho$ is the density of air)
Hence Newton's law of motion provides the acceleration of the balloon upwards, given by: $ma=V\rho g-mg$

Multiple choice archimedes' principle fluid pressure properties of matter physics

When a body is wholly or partly immersed in a liquid it experiences. 

  1. An up-thrust or down-thrust depending on the density of the liquid

  2. An up-thrust

  3. A down-thrust

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Whenever a body is wholly or partially immersed in a liquid it experience an upthrust or buoyant force.

Multiple choice archimedes' principle fluid pressure properties of matter physics

The principle on which Hare's apparatus works on is.

  1. Bernoulli's principle

  2. Archimedes principle

  3. Newton's law

  4. Kepler's law
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hare`s apparatus is used  to compare the densities of two liquids and is base on Archimedes principle .

so option (B) is correct

Multiple choice archimedes' principle fluid pressure properties of matter physics

The upward thrust exerted on the body by the liquid acts vertically upwards through the center of gravity of the displaced liquid.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

when a body is immersed in a fluid an downward force mg acts on it and to balance this force an upward force kown by the name buoyant force is exerted by the fluid .

so given statement is true , hence option ( A) is correct

Multiple choice archimedes' principle fluid pressure properties of matter physics

A body is floating in a given liquid with half of its volume above the surface of the given liquid. If the body is slightly pushed into the liquid, then the body,

  1. sinks in the liquid and settles at the bottom.

  2. come back to its position after some time.

  3. keeps oscillating in vertical direction.

  4. it jumps into the air and falls on the liquid.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Before pushing body was in the position of equilibrium so if we disturbs the eqm than with the passage of time it would come back to its eqm position .

so option (B) is correct

Multiple choice archimedes' principle fluid pressure properties of matter physics

Apparent loss of weight of a body when immersed in a liquid can be explained on the basis of 

  1. molecular theory.

  2. electron theory.

  3. Archimedes' principle.

  4. Bernoulli's principle.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Archimedes principle states that  loss in weight of a partially or fully immersed body in a fluid is equal to the weight of the fluid displaced .

so , option (C) is correct

Multiple choice archimedes' principle fluid pressure properties of matter physics

A ball floats on the surface of water in a container exposed to the atmosphere. Will the ball remain immersed at its former depth or will it sink or rise if the container is covered and the air is removed:

  1. The ball sinks

  2. The ball rises

  3. The ball remains immersed at its former depth

  4. It oscillates
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ball floats due to the buoyant force, which depends on the pressure gradient in the fluid. When the air is removed, the pressure at the surface becomes zero, but the pressure gradient (rho*g*h) remains the same as long as the fluid is incompressible; however, if the ball is held up by air pressure or if the surface tension/meniscus changes, it might sink. In standard physics problems of this type, the removal of atmospheric pressure does not change the buoyancy of a submerged object, but if the ball is floating, the lack of air pressure on the top surface while the water pressure remains below causes it to sink deeper.

Multiple choice archimedes' principle fluid pressure properties of matter physics

A piece of ice is floating on water in a container. What will happen to the surface of the water when whole ice piece melts

  1. Will go up

  2. Will not change

  3. Will go down

  4. Noe of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The water level eill not change. As the mass of ice before and after melting will remain same. When the ice was floating, the volume of water displaced has the mass equal to that of ice. After melting, that mass of ice has been converted into water. 
Thus there is no net change in level.