Elective Physics 2 - Pre Test

It is the branch of fluid mechanics that studies incompressible fluids at rest.

• Thermodynamics

• Fluid Mechanics

• Fluid Statics

• Solid Mechanics

A person wearing steel toe capped boots and a person wearing stiletto heels stand on a wooden floor. They both have the same weight. Which person exerts a greater pressure on the floor?

• The person wearing the boots because the boots have a larger surface area in contact with the floor.

• The person wearing the boots because the boots have a smaller surface area in contact with the floor.

• The person with the stiletto heels because they have a larger surface area in contact with the floor.

• The person with the stiletto heels because they have a smaller surface area in contact with the floor.

Fluids can be...

• liquids

• solids

• liquids or gases

• gases

Which statement correctly describes pressure?

• force per unit area

• force times surface area

• the area to which a force is applied

• the applied force that acts on an object

What is the greatest benefit of using hydraulics?

• The multiplication of operating time.

• The multiplication of force.

• The multiplication of fuel efficiency.

• The multiplication of speed.

TRUE or FALSE

"If the weight of the water displaced is the same as the weight of the object placed in the water, the object will sink".

• TRUE

• FALSE

The density of water is 1g/cm^3. A substance will float if its density is less than that of water. Which of the following substance will float?

• substance 1

• substance 2

• substance 3

• substance 4

What happens to the buoyant force acting on the airship as it rises in the air?

• Buoyant force increases.

• Buoyant force decreases.

• Buoyant force remains constant.

• Buoyant force first increases then shows decrease.

The density of gasoline is 721 kilograms per cubic meter. What is its specific gravity?

• 0.072

• 0.731

• 1.72

• 0.721

Which of the following is a statement of Archimedes' principle?

• Buoyant force is the weight of the mass of water displaced by an immersed object.

• Buoyant force is the weight of the surface area displaced by an immersed object.

• Buoyant force is the weight of the volume of water displaced by an immersed object.

• Buoyant force is the weight of the mass of an immersed object.