Unit3 Test

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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