Tag: pressure in fluids

Questions Related to pressure in fluids

Fluids are
physics forces and matter pressure in fluids pressure in liquids introduction to pressure
  1. The substances which are lighter than air.
  2. The substances which let substances float on them.
  3. The substances which can flow easily.

  4. Liquids.

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Correct Option: C
Explanation:

A fluid is a substance such as liquid or gas which can flow easily, has no fixed shape and can changes its shape at a steady rate when acted upon by a force tending to change its shape.

If a sea fish enters a river, the fish will

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. swell

  2. be squeezed

  3. remain as it is

  4. suffer none of these

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Correct Option: A
Explanation:

Density of sea water is more than that of river water. So, at same depth, sea water exerts greater pressure. And, the body of the sea fish is habituated with the high pressure from outside. Now, as the same fish enters the river, water density being low, will suffer less pressure from outside. As a result, the body of the fish will swell out slightly.

Pressure exerted at a point in a liquid is 

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. scaler

  2. vector

  3. teasor

  4. none

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Correct Option: A
Explanation:

Pressure exerted at a point in a liquid is equal in magnitude in all directions, hence it is scalar.

Pressure exented by the liquids on the walls of the container depends upon

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. density

  2. declaration due to gravity

  3. height of the liquids column

  4. all

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Correct Option: D
Explanation:

Pressure exerted by the fluids on the sides of the container is called lateral pressure. It depends on the all the given options, mathematically p = hpg

Mark the most common fluids
physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Air

  2. Water

  3. Kerosene

  4. Both A and B are considered as most common fluids
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Correct Option: D
Explanation:
A fluid is a substance such as liquid or gas which can flow easily, has no fixed shape and can changes its shape when acted upon by a force tending to change its shape.
Air is the most common mixture of gas.
Water is the most common liquid present on earth.
Hence correct answer is option D.
Mark the correct Statements.
physics forces and matter pressure in fluids pressure in liquids introduction to pressure
  1. Solids exert pressure on a surface due to their own weight.

  2. Fluids also have weight.

  3. Liquids can exert pressure.

  4. All the above

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Correct Option: D
Explanation:

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

Pressure is exerted by fluids because of their weight. Static fluid pressure is given by = $\rho \times g \times h $
where $h$ =  depth of the fluid, 
            $\rho$ =  density of the fluid and 
            $g$ = the acceleration due to gravity.
Well knowingly, the solids exert pressure on the surface on which they are placed, given by $P=\dfrac{mg}{A}$
Hence correct answer is option D.

Fluids exert pressure on
physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Air

  2. The container in which they are stored

  3. Both A and B

  4. Their own molecules which are present on the surface of the container
Show answer
Correct Option: B
Explanation:
A fluid is a substance that has no fixed shape and yields easily to external pressure; a gas or  a liquid.
Pressure is exerted by fluids because of their weight. 
Static fluid pressure is given as = $\rho \times g \times h$
where $h$ = depth of the fluid,
           $\rho$ = the density of the fluid and
           $g$ = the acceleration of gravity.
Hence they exert pressure in the container in which they are stored.

How fluid pressure is different from solid pressure?

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Solid pressure leads to deformity while fluid pressure doesnt

  2. Solid pressure doesn't lead to deformity while fluid pressure leads to deformity

  3. Both leads to deformity

  4. Both doesn't lead to deformity

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Correct Option: A
Explanation:

Solid pressure is different from fluid pressure in the sense that solid pressure leads to deformity while fluid pressure doesnt.

State True or False.
A fluid exerts pressure in all possible directions.

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. True

  2. False

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Correct Option: A
Explanation:

Since a fluid has no definite shape, its pressure applies in all directions. Fluid pressure can also be amplified through hydraulic mechanisms and changes with the velocity of the fluid.

The size of an air bubble rising up in water.

physics forces and matter pressure in fluids pressure in liquids introduction to pressure

  1. Decreases

  2. Increases

  3. Remains same

  4. May increase or decrease

Show answer
Correct Option: B
Explanation:

 As the pressure exerted by water is directly proportional to the depth of water, as the depth of water increases in a water body, the pressure increases linearly. So when a air bubble rises in water, the pressure acting on the air bubble decreases. 


We know the that as the the pressure acting on gas is inversely proportional to the volume occupied by it i.e. if the pressure increases, then the volume occupied will decrease and if the pressure acting on the gas decreases, then the volume occupied by by the gas will increase.


In the rising air bubble, as the pressure is decreasing, the volume and hence its size increases.

so option (B) is correct.