Laser Exam Questions and Answers
1.Which best characterizes laser waves
A - Quasichromatic, non-collimated, non-coherent
B - Multichromatic, non-collimated, non-coherent
C - Monochromatic, collimated, coherent
Answer C - Monochromatic, collimated, coherent
2.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%
Answer B - 20%
3.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
,Answer A - CO2 9,250 nm
4.What is the definition of Power?
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
Answer B - Amount of work performed per unit time, expressed in watts
(W)
5.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
Answer B - Always test fire before use
6.Electromagnetic waves transport energy through
a. Empty Space
b. A material medium
c. Matter
d. Mechanical waves
, Answer a. Empty Space
7.Which is not a way lasers interact with tissues?
a. Reflection
b. Transduction
c. Scattering
d. Absorption
Answer b. Transduction
8.Which laser wave-lengths can penetrate to the retina of the eye and cause
damage?
a. Diode wavelengths
b. Er;YAG
c. Nd;YAG
d. BothA&C
Answer d. BothA&C
9.Light-induced fluorescence can be used for
a. Caries detection
b. Mucosal evaluation
c. Pain relief
d. BothA&B
Answer d. BothA&B
1.Which best characterizes laser waves
A - Quasichromatic, non-collimated, non-coherent
B - Multichromatic, non-collimated, non-coherent
C - Monochromatic, collimated, coherent
Answer C - Monochromatic, collimated, coherent
2.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%
Answer B - 20%
3.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
,Answer A - CO2 9,250 nm
4.What is the definition of Power?
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
Answer B - Amount of work performed per unit time, expressed in watts
(W)
5.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
Answer B - Always test fire before use
6.Electromagnetic waves transport energy through
a. Empty Space
b. A material medium
c. Matter
d. Mechanical waves
, Answer a. Empty Space
7.Which is not a way lasers interact with tissues?
a. Reflection
b. Transduction
c. Scattering
d. Absorption
Answer b. Transduction
8.Which laser wave-lengths can penetrate to the retina of the eye and cause
damage?
a. Diode wavelengths
b. Er;YAG
c. Nd;YAG
d. BothA&C
Answer d. BothA&C
9.Light-induced fluorescence can be used for
a. Caries detection
b. Mucosal evaluation
c. Pain relief
d. BothA&B
Answer d. BothA&B
