Tag: pressure in liquids

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Questions Related to pressure in liquids

Multiple choice physics fluids pressure in fluids pressure in liquids introduction to pressure

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

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice physics pressure pressure in fluids pressure in liquids introduction to pressure

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?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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 .

Multiple choice physics pressure pressure in fluids pressure in liquids introduction to pressure

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 ?

  1. $21.5\ litre$
  2. $25\ litre$
  3. $30\ litre$
  4. $31.5\ litre$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using Bernoulli's equation, the velocity of water exiting the nozzle is v = sqrt(2gh) = sqrt(2 * 9.8 * 2.5) or using g = 9.8/10 approx. The volumetric flow rate is Q = A * v. Integrating over one minute gives the total volume, which computes to 31.5 liters.

Multiple choice physics pressure pressure in fluids pressure in liquids introduction to pressure

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. 

  1. $liquids$
  2. $gases$
  3. $submarines$

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice physics pressure pressure in fluids pressure in liquids introduction to pressure

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

  1. lack of oxygen

  2. more atm pressure

  3. more water pressure

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

Multiple choice physics pressure pressure in fluids pressure in liquids introduction to pressure

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

  1. difference in pressure

  2. gravitational force

  3. decrease of friction in pipes

  4. flow of liquid
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice physics force and pressure pressure in fluids pressure in liquids introduction to pressure

Fluids include

a) Solids    
b) Liquids  
c) Gases

  1. a and b

  2. b and c

  3. a and c

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fluid is a substance that has no fixed shape and yields easily to external pressure; a gas or  a liquid, or, which can easily flow.

It is due to this property of variation of pressure along a fluid that it exerts a buoyant force on a body placed inside it.