Radiologic Quantities and Units

MULTIPLE CHOICE

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

ANS: C A fraction is also called a quotient.

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

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

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

ANS: D Improper fractions have value greater than one.

What is the value of 1/2 – 1/3? 1/3 ¼ 1/5 1/6

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

What is the value of 2/7 + 1/4? 3/11 ¾ 15/28 3/7

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Solve for the equation 3x= 12.

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

Solve for the equation 12 + x = 22.

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

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

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

Solve for the equation 3/x = (1/2)2. 6 12 14 20

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

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

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

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

ANS: C The exponential form of 10 is 101.

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

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

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

ANS: C The rad is the radiation absorbed dose.

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

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

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

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

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

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

Radioactive material is measured in ____. Rads Rems Seiverts Curies

ANS: D Radioactive material is measured in curies