Review Quiz (GenSci)

Why can you fill a balloon with air by blowing air into it through a single small opening?

• Particles of a fluid always spread out to fill their container

• Particles of a fluid always move from an area of lower pressure to an area of higher pressure

• Pressure of a fluid is greater when the same force is applied to a larger area

• Particles of a fluid only move in a single direction

Which of the following is the SI unit for pressure?

• 
  N or Pa

• N/m² or Pa

• N/m or Pa

• Na

Which law states that a change in pressure at any point in an enclosed fluid is transmitted equally throughout the fluid?

• Pascal's Law

• Archimedes' Law

• Bernoulli's Law

• Charles' Law

What happens if an object is placed in water and its density is greater than water?

• The object always sinks

• the object may sink or float

• The object always floats

• 
  The object's density decreases

  
  

What pressure does a 4000N horse exert on the ground if each foot is 10cm² in SI unit?

• 4,000,000 N/m²

• 400 N/m²

• 1,000,000 N/m²

• 10 N/cm²

In a hydraulic machine, a force of 2.25 N is applied on the piston of area 5 cm². what force is obtained on the bigger pistion of area 100cm² ?

• 
  45 N

• 450 N

• 225 N

• 22.5 N

What happens to the pressure of a fluid in a closed container if the temperature of the fluid is increased?

• The pressure decreases.

  
  

• The pressure increases.

• The pressure remains constant.

• The pressure fluctuates.

Pneumatic chairs in hairdressing salons depend on the relationship between volume and pressure of a gas to work. When the hairdresser pushes on the lever, the volume of gas in the cylinder decreases. What happens next?

• The gas pressure increases and the chair is released back down.

• The gas pressure increases and the chair is pushed up.

• The gas pressure decreases and the chair is released back down.

• The gas pressure decreases and the chair is pushed up.

a hammer being used by a person to remove a nail from a piece of wood is an example of what simple machine? 

• wheel an axle

• screw

• 
  lever

• inclined plane

A fishing pole is an example of a compound machine. What simple machines are used to make up this compound machine?

• lever, wheel and axle, pulley

• wheel and axle, pulley, inclined plane

• 
  wheel and axle, inclined plane, pulley

• wedge, pulley, lever