Tag: fluid pressure

Questions Related to fluid pressure

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

archimedes' principle fluid pressure properties of matter physics

  1. Bernoulli's principle

  2. Archimedes principle

  3. Newton's law

  4. Kepler's law

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Correct Option: B
Explanation:

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

so option (B) is correct

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

archimedes' principle fluid pressure properties of matter physics

  1. True

  2. False

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Correct Option: A
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

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,

archimedes' principle fluid pressure properties of matter physics

  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.

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Correct Option: B
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

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

archimedes' principle fluid pressure properties of matter physics

  1. molecular theory.

  2. electron theory.

  3. Archimedes' principle.

  4. Bernoulli's principle.

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Correct Option: C
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

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:

archimedes' principle fluid pressure properties of matter physics

  1. The ball sinks

  2. The ball rises

  3. The ball remains immersed at its former depth

  4. It oscillates

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Correct Option: A

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

archimedes' principle fluid pressure properties of matter physics

  1. Will go up

  2. Will not change

  3. Will go down

  4. Noe of these

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Correct Option: B
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.

In a car lift compressed air exert a force F1 on a small Piston having radius of 5 cm. This pressure is transmitted to second piston of radius 15 cm. If the mass of the car to be lifted is 1350 kg. What is F1?

archimedes' principle fluid pressure properties of matter physics

  1. $14.7\times 10^3 N$

  2. $1.47\times  10^2 N$

  3. $2.47\times  10^3 N$

  4. $24.7\times 10^2 N$

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Correct Option: C

A wooden block is taken to the bottom of a lake of water and then released . it rise up with a 

archimedes' principle fluid pressure properties of matter physics

  1. Constant acceleration

  2. Decreasing acceleration

  3. Constant velocity

  4. Decreasing velocity

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Correct Option: A

Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by

archimedes' principle fluid pressure properties of matter physics

  1. Bernoulli

  2. Archimedes

  3. Boyle

  4. Pascal

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Correct Option: A

A cube of wood supporting $200 \mathrm { gm }$ mass just floats in water in fully submerged state. When the mass is removed cube rises by $2 \mathrm { cm }$ above water level. Find the size of cube? (take $\rho _ { \text { water } } = 1000 \mathrm { kg } / \mathrm { m } ^ { 3 } )$

archimedes' principle fluid pressure properties of matter physics

  1. $10 \mathrm { cm }$

  2. $15 \mathrm { cm }$

  3. $20 \mathrm { cm }$

  4. $30 \mathrm { cm }$

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Correct Option: C