Chapter 5

A 60 W fluorescent bulb produces as much light as a 60 W incandescent bulb. How much energy does the incandescent bulb use in 10 hours? A. 0.6 kWh C. 6 kWh B. 6.5 kWh D. 65 kWh

A

A blow dryer is 1850 watts. How much electric energy do you use if you take 15 minutes to dry your hair A. .4625 kWh C. 46.25 kWh B. 4.625 kWh D. 462.5 kWh

A

A nuclear generator converts what form of energy into what other form? A. Nuclear to electrical C. Nuclear to light B. Nuclear to chemical D. Nuclear to sound

A

An automobile changes energy into different forms. The total amount of energy does not change due to the A. Law of conservation of energy B. Law of conservation of mass C. Concept of kinetic energy D. Measure of energy efficiency

A

An electric company charges customers for the number of kilowatt-hours used. Your household uses 2,400 W for 300 hours. How many kilowatt-hours will be on your electric bill? A. 720 kWh C. 72 kWh B. 7.20 kwh D. 0.72 kWh

A

Could a similar electrical generator be designed that burns coal in the first step? Explain your answer in terms of energy conversions. A. Yes, chemical energy from coal converts to thermal energy B. Yes, chemical energy from coal could be converted to thermal energy C. No, coal could not burn and boil water D. No, chemical energy from coal is not possible

A

How is a nuclear generator similar to a generator that is water flowing over a dam as an energy source Both turn forms of energy into mechanical energy needed A. to turn the turbine B. Both use solar energy C. Both turn nuclear energy into chemical energy D. They are not similar

A

The ability to cause change is called? A.Energy C. mass B. Atoms D. State

A

Which of these is consistent with the law of conservation of energy? A. Energy is converted from one form to another B. Energy is created C. Energy is destroyed D. The total amount of energy in the universe changes.

A

A 25 W compact fluorescent bulb produces as much light as a 100 W incandescent bulb. How much electric energy in kWh does the fluorescent bulb use in 5 hours? A. 1.25 kWh C. 12.5 kWh B. 0.125 kWh D. 4125 kWh

B

A solar cell converts sunlight into A. Thermal energy C. Nuclear energy B. Electrical energy D. Mechanical energy

B

In many energy conversion, the largest amount of wasted energy often ends up as A. Light C. sound B. Heat D. Matter

B

Sunlight is changed into electric energy by a A. Thermal cell C. Nuclear battery B. Solar cell D. chemical battery

B

The energy stored in food is a form of? A. Kinetic energy B. Potential energy C. thermal energy D. electromagnetic energy

B

The water that cools the rubines in generally returned back to the lake or ocean from it came. What effect does this have on the thermal energy of the lake? A. The thermal energy will decrease B. The thermal energy will increase C. There is no effect D. The thermal energy will not change

B

Tom moves a bag of groceries from the floor to a table. By moving the bag, he has increased the bag's A. Kinetic energy C. Mechanical energy B. Potential energy D. Chemical energy

B

What advantage do light-emitting diodes (LEDs) have? A. They are more expensive than incandescent light bulbs. B. They convert almost all the electricity they use into light. C. They add useful heat into the surrounding room. D. They use a different type of energy than incandescent light bulbs do.

B

Which arrangement shows the sequence of energy transformation that occurs when you apply brakes to a bicycle? A. Moving bicycle, friction produced, brakes applied, thermal energy increases B. Moving bicycle, brake applied, thermal energy increase, friction produced C.Brakes applied, moving bicycle, friction produced, thermal energy increase, D. Brakes applied, moving bicycle, thermal energy increase, friction produced

B

An iron is 1500 watt. If you use the iron for .5 hours how much electric energy do you use? A. 7.5 kWh C. .75 kWh B. 75 kWh D. .775 kWh

C

Describe two conversions that take place when you strike a match A. Electrical to light to heat B. Sound to heat to chemical C. chemical to mechanical to light D. Mechanical to heat to light

C

Friction causes what energy transformation? A. Thermal into Kinetic C. Kinetic into thermal B. Potential into kinetic D. thermal into radiant

C

If a household uses 1,800 W each hour for 15 hours, how many kilowatt-hours are used? A. 2.75 kWh C. 27 kWh B. 2.7 kWh D. 0.27 kWh

C

Kinetic energy of an object depends on its ____ and _____. A. Mass and volume C. Speed and Mass B. Speed and volume D. Mass and height

C

When a rock falls from a cliff, A. Kinetic energy changes into potential energy B. Chemical energy changes into electrical energy C. Potential energy changes into kinetic energy D. Electrical energy changes into chemical energy

C

Which produces the most air pollutants? A. Burning natural gas C. Burning coal B. Hydroelectric power plants D. Nuclear power plants

C

Which type of energy is released when the nuclei of some atoms split? A. Sound C. Nuclear energy B. Electric energy D. Solar energy

C

X-rays are an example of ___ energy? A. Nuclear energy C. electromagnetic energy B. Electric energy D. chemical energy

C

which type of energy is stored in the nucleus? A. sound energy B. electrical energy C. Nuclear energy D. solar energy

C

A water heater is rated at 5,500 watts and operated for 106 hours per month. How much electric energy in kwh does the water heater use each month A. .583 kWh C. 58.3 kWh B. 5.83 kWh D. 583 kWh

D

Chris compares several clothes dryers. The one suing the A. greatest percentage of its energy to dry the clothes Is the largest dryer B.. Has the lowest energy efficiency C. Is the smallest dryer D. Has the highest energy efficiency

D

How is the law of conservation applied to the example of the burning log? A. Mechanical energy is converted to light and heat B. Thermal energy is converted to light C. Sound energy is converted to heat and light D. Chemical energy is converted to light, sound, and heat

D

Is all the nuclear energy eventually converted to electrical energy? How do you know? A. Yes, all is converted to electric B. Yes, all the nuclear reactions heated the water C. No, some is lost in building D. No, some is converted to heat in turbines

D

Judy shoots a rubber band toward a tree. What energy conversion happens when she shoots the rubber band? A. Mechanical to thermal C. Kinetic to potential B. Chemical to mechanical D. potential to kinetic

D

Judy shoots a rubber band towards a tree. The rubber band hits the tree with a "whap" knocking off a small bark and bouncing off the tree. Using what you know about potential kinetic energy, explain the energy conversion in the rubber band sound A. Stretching and holding the rubber band is potential energy B. Letting go causes potential energy to convert to kinetic energy C. The tree has potential energy which converts to sound energy when hit D. Letting go of the rubber band cause some kinetic energy t change to sound energy when it hits the tree

D

Laurie has the most kinetic energy when she is? A. Sitting in a chair C. Walking slowly B. Standing on the roof D. riding a bicycle

D

Laurie is riding her bicycle. Her kinetic energy depends on her mass and A. Weight C. Temperature B. Height D. speed

D

Suppose that a log is burning in a fireplace. The log contains chemical energy A. Nuclear energy converts to light and heat B. Thermal energy converts to electrical energy C. Chemical energy converts to electrical energy D. Chemical energy converts to light to heat

D

Which of the following is a conversion from chemical energy to mechanical energy? A dark light bulb starting to glow B. Food being heated in an oven C. a ball rolling down a hill D. a person lifting a weight

D

if the gym uses 4500 W each hour for 8 hours, how much kilowatt- hours are used? A. 3.36 kWh C. 3.6 kWh B. 0.36 kWh D. 36 kWh

D