NVCC RAD 105 Final
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. At 25 lux, the maximum ambient lighting in a radiologists' reading room while
images are being diagnosed should be less than _____________ of the typical
lighting for offices in general:
a. 3/4
b. 1/2
c. 1/4
d. 1/10
Correct Answer: c. 1/4
2. In terms of energy emitted, one lumen is equal to about 0.0015 _____________
of power per steradian:
a. ohms
b. amps
c. volts
d. watts
Correct Answer: d. watts
3. The device (provided by many manufacturers of display monitors) designed to
directly measure luminance, or the light intensity emitted from a display monitor,
,is the:
a. densitometer
b. photometer
c. lux inflector
d. SMPTE test device
Correct Answer: b. photometer
4. Read-out from a photometer may be in:
a. lumens
b. candela per square meter
c. either of the above
d. neither of the above
Correct Answer: c. either of the above
5. For their display monitors, radiologists generally prefer a brightness level of:
a. 250 lumens
b. 500-600 lumens
c. 800 lumens
d. 250 candela
Correct Answer: b. 500-600 lumens
6. When you touch the face of an LCD monitor screen, you are directly touching
its:
a. filters
b. pixels
c. LEDs
d. circuits
Correct Answer: b. pixels
7. In each pixel of an LCD monitor screen, under normal conditions (without
electrical charge applied) the "threads" of liquid crystals tend to line up with:
a. the pixel wires
,b. the iodine molecules in the polarizing lens
c. the magnetic poles of the iodine molecules
d. scratches in the surface of the electrodes
Correct Answer: d. scratches in the surface of the electrodes
8. In an LCD monitor, when an electrical charge is applied to a pixel, the nematic
crystals align:
a. parallel to each other
b. parallel to iodine chain molecules in the polarizing lens
c. parallel to scratches in the electrodes
d. perpendicular to scratches in the electrodes
Correct Answer: a. parallel to each other
9. In an LCD monitor pixel, without any twisting effect on the nematic crystals, the
pixel is depicted as a ___________ spot in the displayed image:
a. light
b. medium gray
c. dark
Correct Answer: c. dark
10. For medical imaging applications, the most common arrangement to provide
lighting in an LCD monitor is:
a. a reflective surface backing
b. LED's behind the screen
c. florescent bulbs placed behind the screen
d. florescent bulbs placed to the side of the screen
Correct Answer: d. florescent bulbs placed to the side of the screen
11. In an LCD monitor, input lag, is caused by:
a. excessive response time
b. excessive refresh time
, c. too much digital processing within the LCD
d. all of the above
Correct Answer: c. too much digital processing within the LCD
12. Truly dead pixels appear as:
a. permanent light spots
b. light spots on the image only
c. permanent dark spots
d. dark spots on one image only
Correct Answer: a. permanent light spots
13. An LCD display monitor should be replaced if there are more than:
a. 15 bad pixels overall
b.3 bad pixels overall
c. 3 bad pixels adjacent to each other
d. any of the above
Correct Answer: d. any of the above
14. Compared to other display systems, the displayed contrast for LCDs is
relatively poor due to their inability to:
a. produce true black
b. achieve uniform sharpness
c. warm up quickly
d. cope with temperature changes
Correct Answer: a. produce true black
15. For the output of an LCD, brightness is:
a. time-dependent
b. temperature-dependent
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. At 25 lux, the maximum ambient lighting in a radiologists' reading room while
images are being diagnosed should be less than _____________ of the typical
lighting for offices in general:
a. 3/4
b. 1/2
c. 1/4
d. 1/10
Correct Answer: c. 1/4
2. In terms of energy emitted, one lumen is equal to about 0.0015 _____________
of power per steradian:
a. ohms
b. amps
c. volts
d. watts
Correct Answer: d. watts
3. The device (provided by many manufacturers of display monitors) designed to
directly measure luminance, or the light intensity emitted from a display monitor,
,is the:
a. densitometer
b. photometer
c. lux inflector
d. SMPTE test device
Correct Answer: b. photometer
4. Read-out from a photometer may be in:
a. lumens
b. candela per square meter
c. either of the above
d. neither of the above
Correct Answer: c. either of the above
5. For their display monitors, radiologists generally prefer a brightness level of:
a. 250 lumens
b. 500-600 lumens
c. 800 lumens
d. 250 candela
Correct Answer: b. 500-600 lumens
6. When you touch the face of an LCD monitor screen, you are directly touching
its:
a. filters
b. pixels
c. LEDs
d. circuits
Correct Answer: b. pixels
7. In each pixel of an LCD monitor screen, under normal conditions (without
electrical charge applied) the "threads" of liquid crystals tend to line up with:
a. the pixel wires
,b. the iodine molecules in the polarizing lens
c. the magnetic poles of the iodine molecules
d. scratches in the surface of the electrodes
Correct Answer: d. scratches in the surface of the electrodes
8. In an LCD monitor, when an electrical charge is applied to a pixel, the nematic
crystals align:
a. parallel to each other
b. parallel to iodine chain molecules in the polarizing lens
c. parallel to scratches in the electrodes
d. perpendicular to scratches in the electrodes
Correct Answer: a. parallel to each other
9. In an LCD monitor pixel, without any twisting effect on the nematic crystals, the
pixel is depicted as a ___________ spot in the displayed image:
a. light
b. medium gray
c. dark
Correct Answer: c. dark
10. For medical imaging applications, the most common arrangement to provide
lighting in an LCD monitor is:
a. a reflective surface backing
b. LED's behind the screen
c. florescent bulbs placed behind the screen
d. florescent bulbs placed to the side of the screen
Correct Answer: d. florescent bulbs placed to the side of the screen
11. In an LCD monitor, input lag, is caused by:
a. excessive response time
b. excessive refresh time
, c. too much digital processing within the LCD
d. all of the above
Correct Answer: c. too much digital processing within the LCD
12. Truly dead pixels appear as:
a. permanent light spots
b. light spots on the image only
c. permanent dark spots
d. dark spots on one image only
Correct Answer: a. permanent light spots
13. An LCD display monitor should be replaced if there are more than:
a. 15 bad pixels overall
b.3 bad pixels overall
c. 3 bad pixels adjacent to each other
d. any of the above
Correct Answer: d. any of the above
14. Compared to other display systems, the displayed contrast for LCDs is
relatively poor due to their inability to:
a. produce true black
b. achieve uniform sharpness
c. warm up quickly
d. cope with temperature changes
Correct Answer: a. produce true black
15. For the output of an LCD, brightness is:
a. time-dependent
b. temperature-dependent
