Tag: fluid pressure

Questions Related to fluid pressure

The method of concentration of the ore that makes use of difference in density between ore and impurities is called __________.

chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. levigation

  2. leaching

  3. magnetic separation

  4. liquation

Show answer
Correct Option: A
Explanation:

Levigation is based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind.

Write the correct alternatives :
In the Wilfley table method, the particles of gangue are separated by...................separation method.

chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. Magnetic

  2. Froth floatation

  3. Hydraulic

  4. Gravitational

Show answer
Correct Option: C
Explanation:

Hydraulic Washing :

In this method by flowing the powdered ore in a current of water, lighter rocky impurities can be washed away, for this, either wilfley table or Hydraulic classifier is used.

$\therefore$ option $"C"$ is correct.

Hydraulic washing is based on the differences in ___________ of the ore and gangue particles.

chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. specific gravities

  2. mass

  3. type of material

  4. none of these

Show answer
Correct Option: A
Explanation:

Hydraulic washing is a type of gravity separation, which is based on gravity differences between the ore and the gangue particles. In this process, the lighter gangue particles are washed away by a stream of water, leaving behind the heavier ore.

A rectangular block is $10\ cm \times 10\ cm \times 15\ cm$ in size is floating in water with $10\ cm$ side vertical. If it floats with $15\ cm$ side vertical, then the level of water will

archimedes' principle fluid pressure properties of matter physics

  1. $Rise$

  2. $Fall$

  3. $Remain\ same$

  4. $Change\ according\ to\ density\ of\ block$

Show answer
Correct Option: C

A boat having some iron pieces is floating in a pond. If iron pieces are thrown in the liquid then level of liquid 

archimedes' principle fluid pressure properties of matter physics

  1. Increases

  2. Decreases

  3. May increase or decrease

  4. Neither increases nor decreases

Show answer
Correct Option: B

A coil of wire of cross-section$0.50$ $m m ^ { 2 }4$ weighs $75g$ in air and $65g$ in water. The length of the coil in cm is

archimedes' principle fluid pressure properties of matter physics

  1. $\frac { 10 ^ { 2 } } { 50 }$

  2. $\frac { 10 ^ { 2 } } { 0.50 }$

  3. $\frac { 10 ^ { 5 } } { 50 }$

  4. $\frac { 10 ^ { 5 } } { 0.0050 }$

Show answer
Correct Option: C

A hollow metal container floats in water, because it displaces _____ weight of water than/as its own weight.

archimedes' principle fluid pressure properties of matter physics

  1. more

  2. less

  3. same

  4. can't say

Show answer
Correct Option: C
Explanation:

FALSE
If hollow metal container  displaces more weight of water than its own weight it will sink.
Because, we know that by Archimedes principle, the weight of water displaced should be equal to the weight of the part submerged in water. If the weight is greater than the weight of the object, it will sink.

A piece of ice floats in a liquid denser than water.The liquid fills the vessel upto the edge. If ice melts completely then:

archimedes' principle fluid pressure properties of matter physics

  1. water level remains unchanged

  2. water level decreases

  3. water overflows

  4. data is insufficient

Show answer
Correct Option: C
Explanation:

Density of ice is less than that of water. If it melts it becomes water. But still, the density of liquid is greater than water therefore, water remains on top and thus it floats and then overflows.

State whether the given statement is True or False :

When submerged, a $3N$ block appears to weigh only $1N$. The missing weight is equal to the weight of the water.

archimedes' principle fluid pressure properties of matter physics

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Objects weigh more in air than in water. When submerged, the 3 N block appears to weigh only 1 N. The missing weight is equal to the weight of the water displaced. The 2 N weight is equal to the buoyant force.
That is, Loss in weight of body = Weight of water (liquid) displaced by the body = Buoyant force or upthrust exerted by water (any liquid) on the body.

A body of density 5.34  $ \displaystyle g/cm^{3} $ when immersed in water (density 1.0$ \displaystyle g/cm^{3} $ ) will 

archimedes' principle fluid pressure properties of matter physics

  1. float

  2. sink

  3. rise

  4. none of these

Show answer
Correct Option: B
Explanation:

 

Any solid floats on water if its density is less than the density of water(i.e. 1).So, it will sink.