1.      Plants convert radiant energy from the sun into chemical energy by a process called photosynthesis.

A.  True

B.  False

 

2.      Nearly all of the energy consumed today is provided by petroleum, coal, hydropower and nuclear sources. 

A.  True

B.  False

 

3.      An elevator motor did 300,000.0 J of work lifting a freight elevator (mass = 500.0 kg).  If each story is 5.0 m, and the elevator started on the ground floor, what is the highest floor it could reach?

A.  60

B.  24

C.  12

D.  5

4.      A 1500 kg car moving at 20.0 m/s is brought to a stop by the brakes.  How many kilocalories of heat are generated in this process?  (Note: )

A.  3.6 kcal

B.  15 kcal

C.  144 kcal

D.  72 kcal

5.      A car traveling 20 mph can stop in about 40 ft.  If the same car were traveling twice as fast, its stopping distance would be roughly

A.  40 ft

B.  60 ft

C.  80 ft

D.  160 ft

6.      You do more work on yourself when you run up the stairs than when you walk slowly. 

A.  True

B.  False

 

7.      An iron cannon ball and a bowling ball were dropped at the same time from the top of a building.  At the instant before the balls hit the sidewalk, the heavier cannon ball has greater

A.  velocity

B.  acceleration

C.  kinetic energy

D.  all of these are the same for the two balls

8.      A liquid at 20°C is twice as hot as the liquid at 10°C.

A.  True

B.  False

 

9.      A metal lid is stuck on a glass jar. What will help you open the jar?

A.  Heat it under running water.

B.  Cool it.

C.  Heat it under running water, then quickly cool it.

D.  Nothing; you are stuck.

10.    The process by which solids vaporize without first becoming a liquid is called

A.  sublimation

B.  condensation

C.  evaporation

D.  boiling

11.    The sum of all the energy of the molecules of an object is called the temperature of that object. 

A.  True

B.  False

 

12.    A weight lifter performs a clean and jerk on 150 kg, raising it 2 m above the ground in 1.5 s.  His power output during the lift is most nearly (Use .)

A.  2000 W

B.  1125 W

C.  750 W

D.  450 W

13.    The specific heat of copper is roughly three times as great as the specific heat of gold.  Which of the following is true?

A.  If the same amount of heat is applied to equal masses of gold and copper, the copper will become hotter.

B.  Copper heats up three times as fast as gold.

C.  A piece of copper stores three times as much heat as the same mass of gold at the same temperature.

D.  The melting temperature of copper is roughly three times that of gold.

14.    In the equation:   the c stands for the

A.  heat of vaporization.

B.  number of calories gained or lost.

C.  convection coefficient.

D.  specific heat.

15.    Work is the rate at which you expend energy. 

A.  True

B.  False

 

16.    When water vapor condenses to a liquid

A.  it absorbs energy from the surroundings.

B.  its temperature drops sharply.

C.  it transfers heat to the surroundings.

D.  its temperature rises slightly.

17.    Two identical cars start at rest on a long hill, with car B twice as high as car A.  How much more work is needed to stop car B at the bottom of the hill?

A.  Twice as much.

B.  Three times as much.

C.  Six times as much.

D.  Nine times as much.

18.    The heat of vaporization of water is 540 cal/g.  When 10 g of water evaporates from your skin

A.  5400 calories are transferred to your skin.

B.  5400 calories are absorbed from your skin.

C.  your skin remains at the same temperature because phase changes occur at constant temperature.

D.  Water doesn't vaporize at temperatures under 100°C.

19.    Molecules in a solid

A.  are harder than molecules in liquids or gases.

B.  transfer heat to their neighbors by a process called convection.

C.  have no internal energy because they are not moving around.

D.  are held in nearly fixed positions by strong attractive forces.

20.    Which one of the following has an appropriate unit?

A.  work - joule

B.  force - newton

C.  power - watt

D.  all of the above.

21.    Two students are poised to dive off equal height diving towers to a swimming pool below.  Student B is twice as massive as student A.  Which of the following is true?

A.  Student B will reach the water sooner than student A.

B.  Both students have the same gravitational potential energy.

C.  Both students will have the same kinetic energy just before hitting the water.

D.  Student B did twice as much work climbing the tower.

22.    If you roll a 5.0 kg bowling ball down the alley at 10.0 m/s, how much work did you do on the ball?

A.  250 J

B.  490 J

C.  2500 J

D.  none since the height did not change.

23.    Water molecules move back and forth between the liquid and gaseous phases

A.  only when the air is not saturated

B.  only at 100°C

C.  only when the relative humidity is 100%

D.  at all times

24.    A flower pot falls off a window ledge 10.0 m above the ground.  Its velocity as it hits the ground is (Use .)

 

A.  10 m/s

B.  14 m/s

C.  20 m/s

D.  unknown, because the mass was not given

25.   

A.  joule

B.  newton

C.  horsepower

D.  watt


Answer Key for Test “sample_2”, 9/8/03

 

No. on
Test

Correct
Answer

1

T

2

T

3

C

4

D

5

D

6

F

7

C

8

F

9

A

10

A

11

F

12

A

13

C

14

D

15

F

16

C

17

A

18

B

19

D

20

D

21

D

22

A

23

D

24

B

25

A