Three resistors, 30 , 20 , and 60 , are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?
a. 110
b. 10
c. 0.1
d. 36000
[Ques. 2] A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object?
a. 15
b. 25
c. 50
d. 100
e. 15
[Ques. 3] Looking at the Moon, the horns of a waning crescent moon point toward the ______________.
Fill in the blank(s) with correct word
[Ques. 4] Three resistors, 90 , 40 , and 60 , are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?
a. 190
b. 19
c. 0.053
d. 216000
[Ques. 5] A clown 2 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet?
a. 1 m from the floor
b. 50 cm from the floor
c. 25 cm from the floor
d. at the bottom of the mirror
e. 1.5 m from the floor
[Ques. 6] When the Moon is 90 east of the Sun, it will be in the ______________ phase.
Fill in the blank(s) with correct word
[Ques. 7] If the voltage across a resistor is tripled, the current will
a. remain the same.
b. be cut to one-third.
c. be cut by one-third.
d. be tripled.
e. be multiplied by nine.
[Ques. 8] A uniform film of oil (n = 1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a brightness maximum at = 450 nm and a brightness minimum at = 600 nm. What is the thickness of the oil film?
[Ques. 9] A(n) ______________ moon occurs when more than one-half of the Moon's surface appears illuminated.
Fill in the blank(s) with correct word
[Ques. 10] If the voltage across a resistor is doubled, the current will
a. remain the same.
b. be cut to one-fourth.
c. be cut in half.
d. be doubled.
e. be quadrupled.
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