QUIZ PHYSICS

what is meaning of pressure ?

• ​simply defined as the ​amount of force per unit area​

• pressure exerted by a fluid at rest

• relating to or denoting the equilibrium of liquids and the pressure exerted by liquid at rest

What do you understand about hydrostatic pressure?

Formula of pressure

• P = F / A

You are scuba diving in the ocean, and you want to know the hydrostatic pressure at a certain depth. The density of seawater is approximately 1,025 kilograms per cubic meter, and you are at a depth of 20 meters. Calculate the hydrostatic pressure at this depth.

Assumptions:

The acceleration due to gravity (g) is approximately 9.81 m/s².
The atmospheric pressure at the surface is neglected for simplicity.

Which is/are not unit for pressure? (select all that apply)

• Newton per meter²

• kg m s^-2

• lb_m per cm²

• barg

Deep and shallow water wave celerity is governed by ___ & ___ respectively.

• water depth, wave period

• wave period, water depth

• water depth, water depth

• wave period, wave period

A square lamina (each side equal to 2m) is submerged vertically in water such that the upper edge of the lamina is at a depth of 0.5 m from the free surface. What will be the total water pressure (in kN) on the lamina?

• 19.62

• 39.24

• 58.86

• 78.48

The following if FALSE about wave diffraction:

• It occurs due to truncation of wave front

• It occurs due to lateral transfer of energy

• It occurs due to water depth changes

• It occurs due to obstruction in the path of wave propagation

Forging can be classified into 2 types which are open die and closed die forging. TRUE or FALSE?

• True

• False