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Laser Exam Questions with Detailed Verified
Answers
Which best characterizes laser waves:
A - Quasichromatic, non-collimated, non-coherent
B - Multichromatic, non-collimated, non-coherent
C - Monochromatic, collimated, coherent
⼀Answer:⼀ C - Monochromatic, collimated, coherent
A laser pulse cycles between ON for 5 ms and OFF for 20 ms.
What is the duty cycle?
A - 10%
B - 20%
C - 25%
D - 40%
⼀Answer:⼀ B - 20%
Which of the following lasers is used on hard tissue?
A - CO2 9,250 nm
B - THOR
C - Nd:YAG 1064nm
D - Diodes 810-1064nm
⼀Answer:⼀ A - CO2 9,250 nm
What is the definition of Power?
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A - Ability to perform work, expressed in joules (J)
B - Amount of work performed per unit time, expressed in watts
(W)
C - A measurement of the total amount of time that the pulse is
emitted
D - The power of a single, brief emission from a laser programmed
for pulsed behavior rather than continuous operation
⼀Answer:⼀ B - Amount of work performed per unit time, expressed
in watts (W)
When do you test fire a laser?
A - When it is a new laser
B - Always test fire before use
C - Depends on the laser
D - Never
⼀Answer:⼀ B - Always test fire before use
Electromagnetic waves transport energy through
a. Empty Space
b. A material medium
c. Matter
d. Mechanical waves
⼀Answer:⼀ a. Empty Space
Which is not a way lasers interact with tissues?
a. Reflection
b. Transduction
c. Scattering
d. Absorption
⼀Answer:⼀ b. Transduction
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Which laser wavelewngths can penetrate to the retina of the eye
and cause damage?
a. Diode wavelengths
b. Er:YAG
c. Nd:YAG
d. BothA&C
⼀Answer:⼀ d. BothA&C
Light-induced fluorescence can be used for
a. Caries detection
b. Mucosal evaluation
c. Pain relief
d. BothA&B
⼀Answer:⼀ d. BothA&B
Continuous wave lasers cause increased char of tissue compared
to ultraspeed or superpulse lasers. Ultraspeed or superpulse lasers
cause minimal heat spread compared to continuous wave lasers.
a. Both statements are true
b. Statement 1 is true; statement 2 is false
c. Both statements are false
d. Statement 1 is false; statement 2 is true
⼀Answer:⼀ a. Both statements are true
Which of the following is NOT a tissue chromophore that absorbs
a laser wavelength?
a. Water
b. Sodium (not at the dental wavelength)
c. Hemoglobin
d. Melanocytes
Laser Exam Questions with Detailed Verified
Answers
Which best characterizes laser waves:
A - Quasichromatic, non-collimated, non-coherent
B - Multichromatic, non-collimated, non-coherent
C - Monochromatic, collimated, coherent
⼀Answer:⼀ C - Monochromatic, collimated, coherent
A laser pulse cycles between ON for 5 ms and OFF for 20 ms.
What is the duty cycle?
A - 10%
B - 20%
C - 25%
D - 40%
⼀Answer:⼀ B - 20%
Which of the following lasers is used on hard tissue?
A - CO2 9,250 nm
B - THOR
C - Nd:YAG 1064nm
D - Diodes 810-1064nm
⼀Answer:⼀ A - CO2 9,250 nm
What is the definition of Power?
, Page | 2
A - Ability to perform work, expressed in joules (J)
B - Amount of work performed per unit time, expressed in watts
(W)
C - A measurement of the total amount of time that the pulse is
emitted
D - The power of a single, brief emission from a laser programmed
for pulsed behavior rather than continuous operation
⼀Answer:⼀ B - Amount of work performed per unit time, expressed
in watts (W)
When do you test fire a laser?
A - When it is a new laser
B - Always test fire before use
C - Depends on the laser
D - Never
⼀Answer:⼀ B - Always test fire before use
Electromagnetic waves transport energy through
a. Empty Space
b. A material medium
c. Matter
d. Mechanical waves
⼀Answer:⼀ a. Empty Space
Which is not a way lasers interact with tissues?
a. Reflection
b. Transduction
c. Scattering
d. Absorption
⼀Answer:⼀ b. Transduction
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Which laser wavelewngths can penetrate to the retina of the eye
and cause damage?
a. Diode wavelengths
b. Er:YAG
c. Nd:YAG
d. BothA&C
⼀Answer:⼀ d. BothA&C
Light-induced fluorescence can be used for
a. Caries detection
b. Mucosal evaluation
c. Pain relief
d. BothA&B
⼀Answer:⼀ d. BothA&B
Continuous wave lasers cause increased char of tissue compared
to ultraspeed or superpulse lasers. Ultraspeed or superpulse lasers
cause minimal heat spread compared to continuous wave lasers.
a. Both statements are true
b. Statement 1 is true; statement 2 is false
c. Both statements are false
d. Statement 1 is false; statement 2 is true
⼀Answer:⼀ a. Both statements are true
Which of the following is NOT a tissue chromophore that absorbs
a laser wavelength?
a. Water
b. Sodium (not at the dental wavelength)
c. Hemoglobin
d. Melanocytes
