1. Radiologic Quantities and Units

2. MULTIPLE CHOICE

3. A fraction is also called a(n)
Denominator
Numerator
Quotient
Exponent

4. ANS: C
A fraction is also called a quotient.

5. Which is an example of a proper fraction?
2/5
3/2
5/3
7/4

6. ANS: A
If the quotient of the numerator divided by the denominator is less than one, the value is a proper fraction.

7. Which is an example of an improper fraction?
1/2
1/3
7/8
9/4

8. ANS: D
Improper fractions have value greater than one.

9. What is the value of 1/2 – 1/3?
1/3
1/5
1/6

10. ANS: D
First, find a common denominator; then add or subtract: 1/2 – 1/3 = 3/6 – 2/6 = 1/6

11. What is the value of 2/7 + 1/4?
3/11
15/28
3/7

12. ANS: C
First, find a common denominator; then add or subtract: 2/7 + 1/4 = 8/28 + 7/28 = 15/28

13. What is the value of 2/3 ´ 5/8?
7/11
16/15
5/12
24/10

14. ANS: C
To multiply fractions, multiply numerators and denominators, and reduce the answer.

15. 7. What is the value of 2/3 ´ 4/5?
8/15
15/8
10/12
5/6

16. ANS: A
To multiply fractions, multiply numerators and denominators, and reduce the answer.

17. How do you divide fractions?
Invert both fractions and multiply.
Add numerators and multiply denominators
Multiply numerators and add denominators
Invert the second fraction and multiply

18. ANS: D
To divide fractions, invert the second fraction and multiply

19. What is the value of 5/6 ÷ 2/3?
5/9
5/4
4/5
7/9

20. ANS: B
To divide fractions, invert the second fraction and multiply

21. What is the decimal equivalent of 3/10?
0.1
0.3
.003
.0003

22. ANS: B
The fraction 3/10 equals the decimal 0.3.

23. What is the decimal equivalent of 5/1000?
0.5
0.05
.005
.0005

24. ANS: C
The fraction 5/1000 equals the decimal 0.005

25. What is the decimal equivalent of 16/25?
0.64
0.75
0.82
1.52

26. ANS: A
The fraction 16/25 equals the decimal 0.64

27. Solve for the equation 3x= 12.

28. ANS: B
When an unknown, x, is multiplied by a number, divide both sides of the equation by that number

29. Solve for the equation 12 + x = 22.

30. ANS: D
When numbers are added to an unknown, x, subtract that number from both sides of the equation.

31. Solve for the equation x/12 = 3/8.
4.5
9.2
32.0
48.6

32. ANS: A
When an equation is presented in the form of a proportion, cross multiply and then solve for the unknown

33. Solve for the equation 3/x = (1/2)2.6 12 14 20

34. ANS: B
When an equation is presented in the form of a proportion, cross multiply and then solve for the unknown.

35. What is the exponential form of 12,400?
1.2 ´ 104
12.4 ´ 104

36. ANS: A
The exponential form of 12,400 is 1.2 ´ 104

37. What is the exponential form of 10?
103
102
101
100

38. ANS: C
The exponential form of 10 is 101.

39. The unit of measure of radiation in air is the ____.
Rem
Roentgen
Seivert
rad

40. ANS: B
The unit of measure of radiation in air is the Roentgen

41. The ____ is the unit used to describe the dose of ionizing radiation received by a patient.
rem
Seivert
rad
Roentgen

42. ANS: C
The rad is the radiation absorbed dose.

43. What unit is used to measure occupational dose?
rem
Seivert
rad
Roentgen

44. ANS: A
The rem is used to express the quantity of radiation received by radiation workers and populations.

45. The gray is equivalent to ____.
.001 rems
.01 rems
.001 rads
.01 rads

46. ANS: D
The gray is equivalent to .01 rads.

47. A measure of 10-3 rads is a
megarad
Millirad
Microrad
centirad

48. ANS: B
A measure of 10-3 rads is a millirad

49. Radioactive material is measured in ____.
Rads
Rems
Seiverts
Curies

50. ANS: D
Radioactive material is measured in curies