Tag: physics

Questions Related to physics

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.

Pressure inside an inflated balloon is

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

  1. Less than atmospheric pressure

  2. Greater than atmospheric pressure

  3. Equal to atmospheric pressure

  4. May be less than or equal to atmospheric pressure

Show answer
Correct Option: C

The pressure in an enclosed fluid is transmitted _________ in all directions with diminished force

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

  1. equally

  2. unequally

  3. cant say

  4. none

Show answer
Correct Option: A
Explanation:
According to Pascal's law: Pressure in an enclosed fluid is transmitted equally in all direction with diminished force at all the points with same depth. 

Different liquids exert the _____ pressure at a given depth. 

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

  1. same

  2. different

  3. can't say

  4. none

Show answer
Correct Option: B
Explanation:

Different liquids will exert the different pressure at a given depth because of difference in their density.

Liquid rise in a syringe when its piston is pulled up due to 

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

  1. Atmospheric pressure

  2. Inertia of motion

  3. Inertia of rest

  4. Conservation of momentum

Show answer
Correct Option: A
Explanation:

When the piston is pulled up, air pressure inside syringe reduces because of increase in volume. While pressure outside syringe is more than that. So, it pushes liquid into syringe.

Based on which of the following does a water pump draw water?

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

  1. Pressure difference

  2. Bernoulli's principle 

  3. Law of Gravity

  4. None of these

Show answer
Correct Option: A
Explanation:

Water pump reduses the pressure at one end of the pipe and pressure difference drives the water to come up from well.

What is the relationship between liquid pressure and the depth of a liquid?

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

  1. Directly proportional

  2. Inversely proportional

  3. Linear

  4. None of these

Show answer
Correct Option: A
Explanation:

The relationship between liquid pressure and the depth of a liquid:

Pressure at depth 'h' = density of fluid $\times $ acceleration due to gravity 'g' $\times $  depth 'h'.
Pressure is directly proportional to depth. If we triple the depth, we triple the pressure.

The pressure a liquids exerts against the sides and bottom of a container depends on the 

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

  1. atmospheric pressure

  2. surface area

  3. volume of container

  4. density and depth of liquid

Show answer
Correct Option: D
Explanation:

$\because p = h\times d\times g$
where, p = pressure, h = depth (height), d = density,  g = acceleration due to gravity = constant.

So, pressure depends on density and depth of liquid.