NBCE PT BOARDS EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS
,A COMPLETE SOLUTION THAT
COVERS 2025 BEST GRADED A+ FOR
SUCCESS
Question 1
Which modality provides the deepest tissue penetration?
A) Infrared
B) Microwave Diathermy
C) Shortwave Diathermy
D) Ultrasound
Answer: D) Ultrasound
Rationale: Ultrasound provides the deepest tissue penetration (4-8 cm) compared to
other modalities. UV penetrates only 1-2 mm, infrared 8-10 mm, and
microwave/shortwave diathermy provide deep heating but not as deep as ultrasound.
Ultrasound waves can penetrate through skin and adipose tissue to reach deep
musculature and joint structures.
,Question 2
A patient presents with open growth centers (epiphyseal plates). Which modalities
should be AVOIDED?
A) Infrared and UV
B) Cryotherapy and TENS
C) Shortwave Diathermy, Microwave Diathermy, and Ultrasound
D) Low Volt Galvanic and High Volt
Answer: C) Shortwave Diathermy, Microwave Diathermy, and Ultrasound
Rationale: Deep heating modalities are contraindicated over open growth plates
because they can potentially damage the actively dividing cartilage cells and disrupt
normal bone growth. The thermal effects may accelerate or alter the ossification
process, leading to growth abnormalities.
Question 3
For which modalities are protective goggles REQUIRED?
A) Ultrasound and Cryotherapy
B) UV, Microwave Diathermy, and Laser
C) Shortwave Diathermy and Infrared
D) TENS and Iontophoresis
Answer: B) UV, Microwave Diathermy, and Laser
,Rationale: UV radiation can cause photokeratitis and retinal damage. Microwave
diathermy requires wire-mesh goggles to protect against microwave radiation. Lasers
can cause permanent retinal damage even from brief exposure. Each of these modalities
poses specific ocular risks requiring appropriate eye protection.
Question 4
Which modality has BOTH antibacterial AND antifungal properties?
A) Ultrasound
B) Infrared
C) Shortwave Diathermy
D) UV
Answer: D) UV
Rationale: Ultraviolet radiation has germicidal properties, damaging the DNA of
microorganisms. It is effective against bacteria, fungi, and viruses. UV-C (254 nm) is
particularly effective for sterilization purposes and is used clinically for treating
superficial skin infections.
Question 5
What form of cryotherapy does NOT use conduction as the primary method of
heat transfer?
A) Ice pack
B) Ice massage
, C) Cold pack
D) Cold bath
Answer: D) Cold bath
Rationale: Cold baths use convection rather than conduction for heat transfer. In
conduction, heat transfers through direct contact between solid objects. In convection,
heat transfers through fluid movement. Cold water circulating around the body part
creates convection currents, moving heated water away and bringing cooler water into
contact with the skin.
Question 6
Cryotherapy reduces muscle spasm by inhibiting what structure?
A) Golgi tendon organ
B) Muscle spindle
C) Pacinian corpuscle
D) Free nerve endings
Answer: B) Muscle spindle
Rationale: Cold decreases muscle spindle activity and gamma motor neuron firing,
reducing the stretch reflex and muscle tone. This inhibition of the muscle spindle's
sensitivity to stretch is a primary mechanism by which cryotherapy alleviates muscle
spasm and spasticity.
Question 7
AND CORRECT DETAILED ANSWERS
,A COMPLETE SOLUTION THAT
COVERS 2025 BEST GRADED A+ FOR
SUCCESS
Question 1
Which modality provides the deepest tissue penetration?
A) Infrared
B) Microwave Diathermy
C) Shortwave Diathermy
D) Ultrasound
Answer: D) Ultrasound
Rationale: Ultrasound provides the deepest tissue penetration (4-8 cm) compared to
other modalities. UV penetrates only 1-2 mm, infrared 8-10 mm, and
microwave/shortwave diathermy provide deep heating but not as deep as ultrasound.
Ultrasound waves can penetrate through skin and adipose tissue to reach deep
musculature and joint structures.
,Question 2
A patient presents with open growth centers (epiphyseal plates). Which modalities
should be AVOIDED?
A) Infrared and UV
B) Cryotherapy and TENS
C) Shortwave Diathermy, Microwave Diathermy, and Ultrasound
D) Low Volt Galvanic and High Volt
Answer: C) Shortwave Diathermy, Microwave Diathermy, and Ultrasound
Rationale: Deep heating modalities are contraindicated over open growth plates
because they can potentially damage the actively dividing cartilage cells and disrupt
normal bone growth. The thermal effects may accelerate or alter the ossification
process, leading to growth abnormalities.
Question 3
For which modalities are protective goggles REQUIRED?
A) Ultrasound and Cryotherapy
B) UV, Microwave Diathermy, and Laser
C) Shortwave Diathermy and Infrared
D) TENS and Iontophoresis
Answer: B) UV, Microwave Diathermy, and Laser
,Rationale: UV radiation can cause photokeratitis and retinal damage. Microwave
diathermy requires wire-mesh goggles to protect against microwave radiation. Lasers
can cause permanent retinal damage even from brief exposure. Each of these modalities
poses specific ocular risks requiring appropriate eye protection.
Question 4
Which modality has BOTH antibacterial AND antifungal properties?
A) Ultrasound
B) Infrared
C) Shortwave Diathermy
D) UV
Answer: D) UV
Rationale: Ultraviolet radiation has germicidal properties, damaging the DNA of
microorganisms. It is effective against bacteria, fungi, and viruses. UV-C (254 nm) is
particularly effective for sterilization purposes and is used clinically for treating
superficial skin infections.
Question 5
What form of cryotherapy does NOT use conduction as the primary method of
heat transfer?
A) Ice pack
B) Ice massage
, C) Cold pack
D) Cold bath
Answer: D) Cold bath
Rationale: Cold baths use convection rather than conduction for heat transfer. In
conduction, heat transfers through direct contact between solid objects. In convection,
heat transfers through fluid movement. Cold water circulating around the body part
creates convection currents, moving heated water away and bringing cooler water into
contact with the skin.
Question 6
Cryotherapy reduces muscle spasm by inhibiting what structure?
A) Golgi tendon organ
B) Muscle spindle
C) Pacinian corpuscle
D) Free nerve endings
Answer: B) Muscle spindle
Rationale: Cold decreases muscle spindle activity and gamma motor neuron firing,
reducing the stretch reflex and muscle tone. This inhibition of the muscle spindle's
sensitivity to stretch is a primary mechanism by which cryotherapy alleviates muscle
spasm and spasticity.
Question 7
