Tag: pressure in fluids

Questions Related to pressure in fluids

Liquid pressure at a point in a liquid does not depend on the :

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. Density of liquid

  2. Shape of the vessel in which the liquid is kept

  3. Depth of the point from the surface

  4. Acceleration due to gravity

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Correct Option: B
Explanation:

pressure in a fluid = $\rho gh $ 

so clearly it is independent of the shape of the vessel in which the liquid is kept .
hence option (B) is correct .

Which of the following scientists invented mercury barometer?

physics fluids pressure in fluids pressure in liquids introduction to pressure

  1. Blaise Pascal

  2. Evangelist Torricelli

  3. Robert Brown

  4. Amedeo Avogadro

Show answer
Correct Option: B
Explanation:

Mercury Barometer was invented by Evangelist Torricelli in the year 1643. It is a device used to measure atmospheric pressure.

A fluid exerts pressure in all possible directions of a container.

physics fluids pressure in fluids pressure in liquids introduction to pressure

  1. True

  2. False

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Correct Option: A
Explanation:

this is the property of fluid to exert pressure in all directions of a container.

so option (A) is correct

Pressure at a point inside the liquid does not depend upon :

physics fluids pressure in fluids pressure in liquids introduction to pressure

  1. The depth of the point below the surface of the liquid.

  2. The nature of the liquid.

  3. The acceleration due to gravity at that point.

  4. The shape of the container.

Show answer
Correct Option: D
Explanation:

Pressure at a point inside the liquid $(P)=hdg$
Hence, it depends on the depth of the point below the surface of the liquid the acceleration due to gravity at that point and on the nature of the liquid but not on the shape of the containing liquid.

Extremely small pollen grains in water are viewed through a microscope. The grains are seen to
move continually and randomly.
What is the reason for this random movement?

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. The grains are moved by randomly moving water molecules

  2. The grains are moved by random convection currents in the water

  3. The grains are moved by random rays of light reflecting off them

  4. The grains are moved by the random motion of their own atoms

Show answer
Correct Option: A
Explanation:

This is due to brownian motion of fluid particles. The pollen get hitted by the water molecules and carried away by them. 

This is reason behind the random motion of pollen grains in water .

A hose shoots water straight up to a height of $2.5m$. The opening end of the hose an area of $0.75\ cm^{2}$. How much water will come out in one minute ?

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. $21.5\ litre$

  2. $25\ litre$

  3. $30\ litre$

  4. $31.5\ litre$

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Correct Option: A

The deep sea divers wear specially designed suites to protect from

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. different sea organisms

  2. different sea plants

  3. high water pressure

  4. none

Show answer
Correct Option: C
Explanation:

To be able to bear very high pressure of liquid in deep sea.

Fill in the blank spaces by choosing the correct words from the options given below.

The hulls of the______are made very strong to withstand huge pressure exerted by the sea water. 

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. $liquids$

  2. $gases$

  3. $submarines$

  4. All of the above

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Correct Option: C
Explanation:

Submarines.
The hull of Submarines are specially Strengthened to prevent it from collapsing from the high pressure of the water outside while submerged. Roughly every $30$ feet of depth under water adds another atmosphere of inward pressure on the hull.

A deep sea diver may hurt his ear drum during diving because of:

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. lack of oxygen

  2. more atm pressure

  3. more water pressure

  4. all of the above

Show answer
Correct Option: C
Explanation:

The pressure at a depth $h$ below the surface of water is given by 

$P=P _0+h\rho g$
Hence as the depth increases, the pressure increases.
Due to this increased pressure, as the diver goes deeper in sea water, the ear drum may get damaged.

In cities water supply from an overhead tank to.the houses is done due to:

physics pressure pressure in fluids pressure in liquids introduction to pressure

  1. difference in pressure

  2. gravitational force

  3. decrease of friction in pipes

  4. flow of liquid

Show answer
Correct Option: B
Explanation:

The water in an overhead tank has higher gravitational potential to compared to water which finally flows out of the taps in the houses. 
The water moves due to this decrease in gravitational potential energy of water by flowing out of taps, or, the water is supplied by the gravitational force acting on water.