Unit3 Test

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5. An electric motor accomplishes what task?
 
[removed]converts chemical energy into mechanical energy
[removed]converts electrical energy into electromagnetic energy
[removed]converts electrical energy into mechanical energy
[removed]converts mechanical energy into chemical energy
[removed]converts mechanical energy into electrical energy

The next five questions refer to these electric meters: 

  
15. How much electricity was used during the month of June?
 
[removed]2813 kwh
[removed]2582 kwh
[removed]3011 kwh
[removed]2903 kwh
[removed]2744 kwh

 

 

17. 

How much would this energy cost the consumer? (assume the average rate of $0.07 per kwh)
 
[removed]$203.00
[removed]$210.77
[removed]$196.91
[removed]$188.90
[removed]$176.43
 
18. What was the meter reading on June 1?
 
[removed]59,301
[removed]58,300
[removed]58,410
[removed]69,411
[removed]58,310
 
19. What was the meter reading on July 1?
 
[removed]61,134
[removed]61,132
[removed]61,234
[removed]61,123
[removed]61,223
 
20. A piece of iron can be made into a permanent magnet by stroking it with a strong magnet.
 
[removed]true
[removed]false
10. If the frequency of a wave is 5 Hz, how many waves will pass by a stationary object in 1 minute?
 
[removed]1/5
[removed]5
[removed]300
[removed]60
[removed]1/300
 
11. A submarine captain wishes to know how far away an undersea cliff face is, so he sends out a SONAR signal. After 0.80 seconds, he receives the echo. How far away is the cliff face?
 
[removed]1500 m
[removed]1200 m
[removed]600 m
[removed]3000 m
[removed]2400 m
 
 Use this figure to answer the next 3 questions: 
  
12. On the diagram, which letter represents the amplitude?
 
[removed]A
[removed]B
[removed]C
[removed]D
[removed]E
 
13. Which of the letters represents the wavelength?
 
[removed]A
[removed]B
[removed]C
[removed]D
[removed]E
 
14. Which position represents the trough?
 
[removed]A
[removed]B
[removed]C
[removed]D
[removed]

E

 

 

1. If a star is moving away from Earth at a high speed, which of the following would astronomers observe?
 
[removed]The star's spectrum would not be shifted at all.
[removed]The star's spectrum would be shifted towards red.
[removed]The star's spectrum would be shifted towards blue.
[removed]

There is not enough information given to determine.

 

 

 

5. The visible spectrum is made of what types of light?
 
[removed]red, orange, yellow, green, blue, violet
[removed]infrared, red, orange, green, blue, ultraviolet
[removed]red, orange, yellow, green, blue, ultraviolet
[removed]radio, infrared, colored light, ultraviolet, x-rays, gamma rays
10. Which of the following has the most energy?
 
[removed]x-rays
[removed]ultraviolet
[removed]visible light
[removed]gamma rays
[removed]infrared
 
11. Which of the following best describes the dual nature of light?
 
[removed]Light can be thought of as visible colors or as invisible colors.
[removed]Light can be thought of as being white light or a combination of colored light.
[removed]Light can be thought of as a mixture of colored light or a mixture of pigments.
[removed]Light can be thought of as behaving like a particle or like a wave.

 

13. What advantage does knowing about the atomic spectrum give astronomers?
 
[removed]It helps them predict solar and lunar eclipses.
[removed]It helps them determine what elements make up stars.
[removed]It helps them determine the age of the universe.
[removed]It helps them know what the planets are made of.
15. Which of the following has the longest wavelength?
 
[removed]infrared
[removed]visible light
[removed]gamma rays
[removed]x-rays
[removed]ultraviolet
 
16. Which of the following scientists did not attempt to calculate the speed of light?
 
[removed]Michelson
[removed]Huygens
[removed]Galileo
[removed]Einstein
 
17. Which of the following characteristics of an object would allow no light to pass through?
 
[removed]horizontal polarization
[removed]opaqueness
[removed]transparency
[removed]translucency
[removed]transmutaticity
19. The "speed of light" (c) refers to the speed of all electromagnetic waves under what conditions?
 
[removed]through the interstellar ether
[removed]through a clear liquid, like water
[removed]through a perfect vacuum
[removed]through the earth's atmosphere
[removed]The speed of light is the same under any conditions.
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