FLUID PRESSURE

What is the formula for pressure in fluids?

• P = FV

• P = F/A

• P = F/d

• P = mV

State Pascal's law.

• Pressure in a confined fluid decreases with an increase in temperature.

• When there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container.

• The pressure in a confined fluid is directly proportional to the volume of the fluid.

• Pascal's law only applies to gases, not liquids.

What is hydrostatic pressure?

• Pressure exerted by a fluid at rest due to the force of gravity.

• Pressure exerted by a gas at rest due to the force of gravity.

• Pressure exerted by a fluid in motion due to the force of gravity.

• Pressure exerted by a solid object due to the force of gravity.

What is atmospheric pressure?

• The force exerted by the Earth's gravitational pull on the atmosphere

• The force exerted by the Sun on the atmosphere

• The force exerted by the wind on the atmosphere

• Force per unit area exerted by the weight of the air

What is the SI unit of pressure?

• kg

• m

• N

• Pa

What is the principle behind manometers?

• Balancing pressure

• Detecting humidity

• Determining wind speed

• Measuring temperature

How does the pressure change with depth in a fluid?

• The pressure is not affected by depth.

• The pressure remains constant with depth.

• The pressure increases with depth.

• The pressure decreases with depth.

A car containing a beaker of water is moving horizontally on a level road. Consider two points, A & B, inside the water such that they are on the same horizontal level and are separated by a distance L. Which of the following options is correct regarding the pressure differences between those two points?

• If car is accelerating with acceleration a, P_A – P_B = ρgL

• If car is accelerating with acceleration a, P_A – P_B = 0

• If car is moving with constant velocity, P_A – P_B = 0

• If car is moving with constant acceleration a, P_A – P_B = ρ (g+a)L

What is the pressure at points A, B, C & D marked in the given mercury barometer? Assume that you have used a tube of length greater than 76cm and then filled it completely with mercury and then inverted into a jar. Let P₀ be atmospheric pressure, g be acceleration due to gravity and ρ be the density of mercury.

• P_A = P₀, P_B = P₀, P_C = P_A, P_D = P₀+ ρgL

• P_A = 0, P_B = P₀, P_C = ρg(h+L), P_D = P₀– ρgh

• P_A = 0, P_B = 0, P_C = P₀, P_D = P₀+ ρgL

• P_A = P₀, P_B = 0, P_C = P₀, P_D = ρgL

Which of the following quantities has the same S.I. unit as that of pressure?

• Work

• Energy / Velocity

• Energy / Displacement

• mass X (velocity)²/Volume