9_SR_PHYSICS REVIEW

Which is NOT true about Energy?

• It can be measured in Joules or in Watts.

• It is the ability to do work.

• It can be measured in Joules or Newton-meter.

• It can not be destroyed nor created.

Which of the following is NOT a factor that would affect the potential energy of an object?

• mass

• speed

• acceleration due to gravity

• height

Which one has greater kinetic energy?

• Vehicle moving at 80 kph

• Vehicle moving at 20 kph

• Vehicle moving at 50 kph.

What is the formula for work?

• Force = work × displacement

• Work = force × displacement

• Distance = force × work

• Work = force × mass

If you push a cart with a force of 60 N for 2 m, how much work have you done?

• 120 J

• 120 N

• 30 J

• 30 N

A 80-kg man climbs up a ladder to a height of 4.8 meters. How much work has he done on himself?

• 3763.20 J

• 163.33 J

• 784 J

• 16.67 J

For a wind powerplant, which of the following are considered as waste energies?

• Heat

• Sound

• Kinetic

• Mechanical

Which type of powerplant will have this energy transformation:

Potential Energy to kinetic energy to mechanical energy to electrical energy + sound energy + heat energy?

• Hydroelectric powerplant

• Wind

  Powerplant

• Solar

  Powerplant

• Geothermal powerplant

In Geothermal powerplants, heat is considered as useful energy. However, if not properly contained, this heat may become a waste. Which of the following processes can help in containing or trapping heat?

• Insulation

• Conduction

• Radiaton

• Convection

Generally, how can we improve the efficiency of a powerplant?

• Minimize waste energy

• Maximize Useful energy

• Maximize waste energy

• Minimize useful energy