NBCE PT BOARDS EXAM QUESTIONS WITH VERIFIED ANSWERS AND DETAILED RATIONALE

NBCE PT BOARDS EXAM QUESTIONS WITH VERIFIED ANSWERS AND DETAILED RATIONALE 1. What is the depth of penetration for microwave diathermy? A) Superficial (1–2 mm) B) Moderate (5–10 mm) C) Deep (2–5 cm) D) Deepest (up to 8 cm) Answer: C) Deep (2–5 cm) Rationale: Microwave diathermy penetrates deeply, typically 2–5 cm, making it effective for heating deep tissues such as muscles and joints. ________________________________________ 2. Which modality is most appropriate for treating herpes zoster? A) Infrared B) Ultrasound C) Ultraviolet radiation and ultrasound D) Shortwave diathermy Answer: C) Ultraviolet radiation and ultrasound Rationale: Ultraviolet radiation has antiviral and germicidal effects, and ultrasound can help with pain and tissue healing in herpes zoster. ________________________________________ 3. In a patient with open growth plates, which modalities should be avoided? A) Ultrasound only B) Shortwave diathermy only C) Shortwave diathermy, microwave diathermy, and ultrasound D) Infrared only Answer: C) Shortwave diathermy, microwave diathermy, and ultrasound Rationale: These modalities can affect bone growth plates; they should not be used over open epiphyses. ________________________________________ 4. Which of the following is a contraindication for spinal traction? A) Disc herniation B) Osteoporosis C) Muscle spasm D) Sciatica Answer: B) Osteoporosis Rationale: Osteoporosis weakens bones, making traction unsafe due to fracture risk. ________________________________________ 5. What is the primary mechanism by which the body dissipates heat through the blood vascular system? A) Convection B) Conduction C) Radiation D) Evaporation Answer: A) Convection Rationale: Convection is the transfer of heat by the movement of a fluid, such as blood, which carries heat away from the core to the periphery. ________________________________________ 6. What is the most common therapeutic ultrasound frequency range? A) 0.5–2.0 watts/cm² B) 2.0–3.0 watts/cm² C) 0.1–0.5 watts/cm² D) 3.0–4.0 watts/cm² Answer: A) 0.5–2.0 watts/cm² Rationale: This is the typical intensity range used for therapeutic ultrasound to produce thermal and non-thermal effects. ________________________________________ 7. Which of the following is a contraindication to the use of ultrasound? A) Muscle spasm B) Anesthesia C) Arthritis D) Bursitis Answer: B) Anesthesia Rationale: Anesthesia impairs sensation, increasing the risk of thermal injury because the patient cannot report discomfort. ________________________________________ 8. Which of the following correctly orders the frequencies used by ultrasound, shortwave diathermy, and microwave diathermy? A) 1 MHz, 27 MHz, 2450 MHz B) 27 MHz, 1 MHz, 2450 MHz C) 2450 MHz, 27 MHz, 1 MHz D) 1 MHz, 2450 MHz, 27 MHz Answer: A) 1 MHz, 27 MHz, 2450 MHz Rationale: Ultrasound uses ~1 MHz, shortwave diathermy uses ~27 MHz, and microwave diathermy uses ~2450 MHz. ________________________________________ 9. The velocity of peripheral nerve conduction decreases by how many m/sec per degree Celsius of cooling? A) 2.4 B) 1.5 C) 3.0 D) 4.2 Answer: A) 2.4 Rationale: Cooling slows nerve conduction velocity by approximately 2.4 m/sec per degree Celsius. ________________________________________ 10. What is a primary effect of high-frequency therapy? A) Analgesic B) Hypo-myotonia C) Edema reduction D) Postural change Answer: A) Analgesic Rationale: High-frequency currents (e.g., diathermy) produce deep heating that can reduce pain through various mechanisms. ________________________________________ 11. Traction is contraindicated in which of the following? A) Hypertension B) Disc herniation C) Muscle spasm