NDHCB/NDHCE FINAL PAPER 2026 QUESTIONS
WITH SOLUTIONS GRADED A+
◉ What happens to the energy and penetrating ability when the
wavelength is shorter? Answer: The radiation energy and penetrating
power is greater
◉ Which is a negative electrode? Answer: Cathode
◉ Which is a positive electrode? Answer: Anode
◉ What on the control panel increases the penetrating ability? Answer:
Kilovoltage peak- kVp
◉ General radiation produces what percent of x-ray photons by dental x-
ray machines? Answer: 70
◉ What is primary radiation? Answer: Penetrating beam that is
produced at the target anode
◉ What is beam quality and density controlled by? Answer: kVp
, ◉ Is an increase in energy an increase or decrease in wavelengths?
Answer: Decrease
◉ What is beam quantity controlled by? Answer: mA
◉ What does density refer to on a radiograph? Answer: Overall darkness
of an image
◉ Increasing kVp does what to contrast? Answer: Creates a low contrast
(many shades of grey)
◉ Decreasing the kVp does what to contrast? Answer: Creates a high
contrast (few shades of grey, mostly dark and light)
◉ Increasing the beam quantity, or mA, does what to the density?
Answer: Increases the density resulting in a darker image
◉ Decreasing the beam quantity, or mA, does what to the density?
Answer: Decreases the density resulting in a lighter image
◉ What type of radiation injury is ionization? Answer: Causes a
breakage in the molecule, can affect structures such as DNA
WITH SOLUTIONS GRADED A+
◉ What happens to the energy and penetrating ability when the
wavelength is shorter? Answer: The radiation energy and penetrating
power is greater
◉ Which is a negative electrode? Answer: Cathode
◉ Which is a positive electrode? Answer: Anode
◉ What on the control panel increases the penetrating ability? Answer:
Kilovoltage peak- kVp
◉ General radiation produces what percent of x-ray photons by dental x-
ray machines? Answer: 70
◉ What is primary radiation? Answer: Penetrating beam that is
produced at the target anode
◉ What is beam quality and density controlled by? Answer: kVp
, ◉ Is an increase in energy an increase or decrease in wavelengths?
Answer: Decrease
◉ What is beam quantity controlled by? Answer: mA
◉ What does density refer to on a radiograph? Answer: Overall darkness
of an image
◉ Increasing kVp does what to contrast? Answer: Creates a low contrast
(many shades of grey)
◉ Decreasing the kVp does what to contrast? Answer: Creates a high
contrast (few shades of grey, mostly dark and light)
◉ Increasing the beam quantity, or mA, does what to the density?
Answer: Increases the density resulting in a darker image
◉ Decreasing the beam quantity, or mA, does what to the density?
Answer: Decreases the density resulting in a lighter image
◉ What type of radiation injury is ionization? Answer: Causes a
breakage in the molecule, can affect structures such as DNA
