Tag: physics

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Questions Related to physics

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.

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

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

  1. Atmospheric pressure

  2. Inertia of motion

  3. Inertia of rest

  4. Conservation of momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Directly proportional

  2. Inversely proportional

  3. Linear

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

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

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

  1. atmospheric pressure

  2. surface area

  3. volume of container

  4. density and depth of liquid
Reveal answer Fill a bubble to check yourself
D Correct answer
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.