Chapter 1

1.

1 point

The kinetic energy of a typical 1 gram meteor is approximately equal to the energy of

10g of TNT

1/100g of TNT

150g of TNT

10g of gasoline

2.

1 point

You have 10 tungsten bulbs, and each uses 100watts. You leave them all on for an hour. The energy used is

1000 watts

10 kilowatts

10 kilowatt hours

1 kilowatt hour

3.

1 point

coal reserves in the united states are expected to last for

72 years

three or four decades

less than a decade/

hundreds of years

4.

1 point

One watt is equivalent to

one coulomb/second

one calorie/second

one horsepower

one joule/second

5.

1 point

Compared to an equal weight of gasoline, U235 can deliver energy that is greater by a factor of (choose the closest value)

one billion

1 million

25,000

2200

6.

1 point

The efficiency of inexpensive solar cells is closest to

1%

65%

100%

12%

7.

1 point

Solar power is about (choose all that are correct)

1 watt per sq meter

1 kW per sq meter

1 megawatt per sq km

1 gigawatt per sq km

8.

1 point

The kinetic energy of a bullet, per gram, is (within a factor of 2)

about the same as the energy released from 1g of TNT

about the same as the energy released by 1g of chocolate chip cookies

about the same as the kinetic energy in a typical 1g meteor

none of the above

9.

1 point

Which one of the following contains the most energy per gram?

battery

TNT

chocolate chip cookies

uranium

10.

1 point

A large nuclear power plant delivers energy of about

1 megawatt

1000 gigawatts

100 gigawatt

1 gigawatt

11.

1 point

which is least expensive- for the same energy delivered?

gasoline

coal

AAA batteries

natural gas

12.

1 point

A human ,running up stairs, can briefly use power of approximately

0.01 horsepower

1 horsepower

0.1 horsepower

0.2 horsepower

13.

1 point

Kinetic energy can be measured in:

amperes

watts

calories

grams

14.

1 point

Electricity from a AAA battery costs the consumer about:

$1 per kilowatt-hour

$1000 per kilowatt-hour

1¢ per kilowatt-hour

10¢ per kilowatt-hour

15.

1 point

The asteroid that killed the dinosaurs exploded because

it got very hot from imapct

it didn't explode; it knocked the Earth out of its normal orbit

It was made of explosive material

it was made out of U-235

16.

1 point

Which of the following statements is true?

Batteries release energy, but TNT releases power

power is energy divided by time.

Energy is measured in joules, and power is measured in calories

All of the above

17.

1 point

Electricity from a wall plug costs the consumer about:

$1000 per kilowatt-hour

10¢ per kilowatt-hour

1¢ per kilowatt-hour

$1 per kilowatt-hour

18.

1 point

The energy per gallon (not per pound) of liquid hydrogen, compared to gasoline, is about

3x less

about the same

3x more

12x more

19.

1 point

Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight batteries

The gasoline has about 70 times less energy

The gasoline has about 400 times as much energy

they cannot be honestly compared, since one stores power and the other stores energy.

The gasoline has about 10 times as much energy

20.

1 point

What is the main reason that hydrogen-driven automobiles have not replaced gasoline ones?

hydrogen is too difficult to store in an automobile

hydrogen is too expensive

hydrogen mixed with air is explosive.

hydrogen is radioactive, and the public fears it

21.

1 point

For each of these, mark whether it is a unit of energy(E) or power (P):

horsepower

kilowatt- hour

watt

calorie

22.

1 point

Hybrid vehicles run on

nuclear power and gasoline.

electric and solar power

electric power and gasoline

solar power and gasoline

23.

1 point

A 12-oz can of soft drink (not the 'diet' or 'lite' kind) contains about

50 calories

10 calories

150 calories

2000 calories

24.

1 point

Most of the hydrogen we use in the United States comes from

pockets of hydrogen gas found underground

hydrogen produced in nuclear reactors

hydrogen gas extracted from the atmosphere

it is manufactured from fossil fuels and/or water

25.

1 point

"Smart rocks" are considered for

ballistic missile defense

geological dating

solar power

nuclear power

26.

1 point

A limitation for all electric automobiles is

batteries explode more readily than gasoline

electric energy is not useful for autos

electric motors are less efficient than gasoline motors.

low energy density per battery