Tag: pressure in fluids

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Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure
Fluids are

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

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

If a sea fish enters a river, the fish will

  1. swell

  2. be squeezed

  3. remain as it is

  4. suffer none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

  1. Air

  2. Water

  3. Kerosene

  4. Both A and B are considered as most common fluids
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure
Mark the correct Statements.

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

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

  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
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.
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.

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

How fluid pressure is different from solid 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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

The size of an air bubble rising up in water.

  1. Decreases

  2. Increases

  3. Remains same

  4. May increase or decrease
Reveal answer Fill a bubble to check yourself
B Correct answer
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.