MAT201 Exam Review

Algebra and Equations

Radiation Physics

Radiographic Procedures

Measurement Conversions

Radiation Dose Calculations

100

Solve for x in the equation 2x+5=15

x = 5

100

The intensity of an X-ray beam at 1 meter is 100 units. What is the intensity at 2 meters?

A) 50 units
B) 25 units
C) 10 units
D) 75 units

B) 25 units

100

If a procedure requires 120 mAs and the current is set to 300 mA, what is the exposure time in seconds?

A) 0.2
B) 0.4
C) 0.6
D) 1.0

A) 0.4

100

Convert 72 inches to centimeters. (1 inch = 2.54 cm)

A) 180 cm
B) 182.88 cm
C) 170 cm
D) 150 cm

B) 182.88 cm

100

Calculate the mAs for 200 mA and 0.5 seconds.

A) 100 mAs
B) 10 mAs
C) 50 mAs
D) 1 mAs

A) 100 mAs

200

Simplify 4(x−3)+2x.

6x−12

200

A radiograph requires an exposure of 10 mAs at 70 kVp. If the kVp increases to 80, what should the mAs be to maintain the same exposure?

A) 15
B) 5
C) 20
D) 10

B) 5

200

A radiographic image requires a magnification factor of 1.25. If the SID is 100 cm, what is the OID?

A) 25 cm
B) 20 cm
C) 30 cm
D) 15 cm

A) 25 cm

200

Convert 500 mL to liters.

A) 5 L
B) 0.5 L
C) 0.05 L
D) 1 L

B) 0.5 L

200

A solution contains 5% iodine. How many grams of iodine are in 200 mL?

A) 5 g
B) 10 g
C) 15 g
D) 20 g

B) 10 g

300

Solve the inequality 3x−7<11

x<6

300

Using the inverse square law, if the intensity is 100 mSv at 40 inches, what will it be at 80 inches?

A) 50 mSv
B) 25 mSv
C) 12.5 mSv
D) 100 mSv

C) 25 mSv

300

With a SID of 180 cm, an object appears 1.5 times its actual size. What is the OID?

A) 30 cm
B) 60 cm
C) 45 cm
D) 50 cm

B) 60 cm

300

Convert 0.75 Gy to milligray.

A) 750 mGy
B) 75 mGy
C) 7.5 mGy
D) 70 mGy

A) 750 mGy

300

Convert 5 rem to millisieverts. (1 rem = 10 mSv)

A) 50 mSv
B) 500 mSv
C) 5 mSv
D) 0.5 mSv

A) 50 mSv

400

Expand and simplify (x+2)(x−5).

A) x²+3x−10
B) x²−3x−10
C) x²−3x−5
D) x²+7x−10

B) x²−3x−10

400

A radioactive substance has a half-life of 6 hours. What fraction remains after 18 hours?

A) 1/4
B) 1/6
C) 1/8
D) 1/3

C) 1/8

400

A patient’s medication is reduced from 150 mg to 120 mg. What is the percentage decrease?

A) 15%
B) 20%
C) 25%
D) 10%

B) 20%

400

A patient weighs 154 lbs. Convert this to kilograms (1 kg ≈ 2.2 lbs).

A) 70 kg
B) 75 kg
C) 80 kg
D) 85 kg

A) 70 kg

400

If the magnification factor is 1.25, and the actual object size is 5 cm, what is the image size?

A) 6.25 cm
B) 7 cm
C) 4 cm
D) 6 cm

A) 6.25 cm

500

Solve for x in the equation 2x+2x=16.

x = 4

500

If the exposure to radiation decreases by half every 5 cm of tissue, what is the exposure after 15 cm, starting from 80 mGy?

A) 20 mGy
B) 40 mGy
C) 10 mGy
D) 5 mGy

C) 10 mGy

500

A radiographic table supports up to 200 kg. What is this weight in pounds? (1 kg ≈ 2.2 lbs)

A) 220 lbs
B) 440 lbs
C) 500 lbs
D) 400 lbs

B) 440 lbs

500

A radiograph measures 35 cm by 43 cm. What are the dimensions in inches?

A) 13.78 in by 16.93 in
B) 12 in by 15 in
C) 14 in by 17 in
D) 14.5 in by 18 in

A) 13.78 in by 16.93 in

500

Convert 0.045 to a fraction in simplest form.

A) 45/100
B) 9/200
C) 9/100
D) 45/200

C) 9/200