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Rad135 Ch1 Basic Mathematics
Test Description: This content covers chapter 1 (Basic Mathematics) from the text to help you prepare for the midterm exam in Rad135.
Instructions: Answer all questions to get your test result.
1) Solve for R: 2/3 + 1/2 = 1/R
A
1.66
B
7/6
C
6/7
D
0.66
2) 4/5 x 1/3 = ?
A
4/15
B
1/3
C
22/15
D
15/22
3) What is the prefix for 10^-9?
A
nano
B
deci
C
kilo
D
hecto
4) 1,825 / 0.2 = ?
A
912.5
B
9,125
C
81.25
D
8,125
5) 2(3 + 5) + 1 -17 = ?
A
14
B
5
C
0
D
-5
6) Round 45.04167 to 2 decimals.
A
45.04
B
45.042
C
45
D
45.0
7) What is the standard unit of time?
A
hour
B
millisecond
C
minute
D
second
8) What is the prefix for 10^6?
A
micro
B
pico
C
mega
D
hecto
9) What must be done first in the order of operations?
A
perform all operations inside grouping symbols
B
unary minus (-) or unary plus (+)
C
exponents
D
multipication and division
10) Simplify in terms of x: ( (3x^2)^2) + x^3 x) / 2x
A
10x^2
B
41x^3
C
10x^3
D
5x^3
11) What would the exposure time in milliseconds (ms) at 55 mAs using 100 mA?
A
550 ms
B
5.5 ms
C
55 ms
D
0.55 ms
12) Which unit is equal to 10 to the 6th power?
A
milli
B
nano
C
mega
D
deca
13) If the primary voltage is 120 volts and 3 amperes, what will the secondary voltage be if the turns ratio is 1000:1?
A
120 V
B
3 mA
C
120 kV
D
36 kV
14) How many significant digits does 45.04 have?
A
0
B
depends on the units
C
1
D
4
15) 2/3 + 1/2 = ?
A
3/5
B
2/6
C
7/6
D
5/3
16) Round 82.1591 to four significant digits.
A
83.00
B
82.15
C
82.16
D
82.00
17) Given 1/RT = 1/R1 + 1/R2 + 1/R3 . Solve for RT, if R1=7, R2 = 3 and R3 = 5.
A
1.48
B
0.67
C
15
D
6
18) Using dimensional analysis, convert the speed of light from 3 x 10^8 m/s to mph.
A
6.71 x 10^5 mph
B
609.34 mpm
C
3 x 10^5 mph
D
6.71 x 10^8 mph
19) What is the SI unit for measuring electric current?
A
ampere
B
volt
C
frequency
D
potential difference
20) The maximum number of electrons that can occupy a given electron shell is equal to 2n^2, where n is the principal quantum. How many electrons can occupy the Q shell? Hint: in K shell n=1, in L shell n=2, in M shell n=3 ...
A
14 e-
B
64 e-
C
98 e-
D
16 e-
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