1|Page
ESSENTIALS OF RADIOGRAPHIC
PHYSICS AND IMAGING CHAPTER
4|ACTUAL QUESTIONS WITH ANSWERS
2026
What is the role of a vacuum tube in x-ray production? - correct-answer -
Electrons jump the gap between oppositely charged electrodes.
What is a good example of a conductor? - correct-answer -Copper.
What are the two types of electric current? - correct-answer -Direct current (DC)
and alternating current (AC).
How does direct current (DC) flow? - correct-answer -In only one direction.
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What is alternating current (AC)? - correct-answer -Current that changes direction
in cycles as the electric potential changes.
At what frequency does electricity alternate in the United States? - correct-
answer -60 cycles per second (60 Hz).
What does Ohm's law express? - correct-answer -The relationship among voltage,
current, and resistance (V = IR).
What is resistance measured in? - correct-answer -Ohms.
What does Ohm's law state? - correct-answer -The potential difference across a
circuit is equal to the current multiplied by the resistance (V = IR).
ESSENTIALS OF RADIOGRAPHIC
PHYSICS AND IMAGING CHAPTER
4|ACTUAL QUESTIONS WITH ANSWERS
2026
What is the role of a vacuum tube in x-ray production? - correct-answer -
Electrons jump the gap between oppositely charged electrodes.
What is a good example of a conductor? - correct-answer -Copper.
What are the two types of electric current? - correct-answer -Direct current (DC)
and alternating current (AC).
How does direct current (DC) flow? - correct-answer -In only one direction.
, 2|Page
What is alternating current (AC)? - correct-answer -Current that changes direction
in cycles as the electric potential changes.
At what frequency does electricity alternate in the United States? - correct-
answer -60 cycles per second (60 Hz).
What does Ohm's law express? - correct-answer -The relationship among voltage,
current, and resistance (V = IR).
What is resistance measured in? - correct-answer -Ohms.
What does Ohm's law state? - correct-answer -The potential difference across a
circuit is equal to the current multiplied by the resistance (V = IR).
