Tag: physics

Questions Related to physics

Fill in the blank.

Liquids exerts pressure in _______ directions.

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

  1. One

  2. Two

  3. All

  4. It do not extent any pressure

Show answer
Correct Option: C
Explanation:

Like solids fluids (liquids and gases) also exent pressure. A solid exent pressure only in the downward direction due to its weight, whereas liquids and gases exent pressure on the walls of their container.

If a sweet water fish enters a sea, 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

Show answer
Correct Option: B
Explanation:

Liquid pressure is given by =$\rho \times g \times h$

The water from river has a lower density than the sea water. So, at equal depth, sweet water or river water exerts less pressure than sea water. Body of a sweet water fish is habituated with this lower pressure of river water. Naturally, when the fish will enter the sea, it will suffer greater pressure due to increase in density and hence the body of the fish will be squeezed slightly.

There are two fish tanks each of depth $0.5 m$. Base area of one is $0.5m^2$ and that of another is $0.1m^2$. At the depth of which tank will a fish feel larger pressure?

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

  1. The tank of wider base area

  2. The tank of smaller base area

  3. Equal for both tanks

  4. Can't say

Show answer
Correct Option: C
Explanation:

Liquid pressure is given by =$ \rho \times g \times h$
Liquid pressure depends on the depth and not on surface area. Both the tanks have the same depth. So, for both the tanks, the fish will feel equal pressure.

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.

Show answer
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

Show answer
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

Show answer
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

Show answer
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
Show answer
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

Show answer
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.