Light strikes a diamond (n = 2.42) at an angle of 60 relative to the normal to the surface. What is the angle of refraction?
a. 21
b. 30
c. 38
d. 69
e. 71
[Ques. 2] The imaginary, huge, apparently moving sphere on which the stars appear to be mounted is called the _______________ sphere.
a. celestial
b. global
c. universal
d. galactic
[Ques. 3] AC voltage may be stepped up or stepped down using a(n) ______________.
Fill in the blank(s) with correct word
[Ques. 4] An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20, what is the angle of refraction into the air?
a. 20
b. 30
c. 38
d. 69
e. 26
[Ques. 5] The angular measurement in hours, minutes, and seconds from the celestial prime meridian eastward is called _______________.
a. sundial
b. protractor
c. declination
d. right ascension
[Ques. 6] A step-down transformer has more windings on the ______________ coil.
Fill in the blank(s) with correct word
[Ques. 7] An aquarium contains a 5-cm layer of water (n = 1.33) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the air is 30, what is the angle of refraction into the carbon tetrachloride?
a. 58
b. 69
c. 37
d. 20
e. 75
[Ques. 8] The angular measure in degrees north or south of the celestial equator is called _______________.
a. declination
b. azimuth
c. altitude
d. latitude
[Ques. 9] In a dc motor, the polarity and current are reversed by a(n) ______________.
Fill in the blank(s) with correct word
[Ques. 10] A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33)
a. 3.2
b. 4.4
c. 2.1
d. 1.0
e. 0.3
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