MRI PHYSICS EXAM SCRIPT 2026 COMPLETE QUESTIONS AND SOLUTIONS GRADED A+

MRI PHYSICS EXAM SCRIPT 2026
COMPLETE QUESTIONS AND SOLUTIONS
GRADED A+


◉Hydrogen. Answer: the most abundant atom in the body


◉atomic number. Answer: Protons in the nucleus


◉Mass Number. Answer: the sum of protons and neutrons in the
nucleus


◉Isotopes. Answer: atoms with the same number of protons but
with a different number of neutrons


◉Electrons. Answer: exist around the nucleus in clouds and spin
around


◉Atom stability. Answer: # protons=# electrons


◉Ions. Answer: different number of protons/electrons

, ◉Motion in the atom. Answer: There are three types of motion in an
atom
i. Electrons spinning on their own axis
ii. Electrons orbiting the nucleus
iii. The nucleus itself spinning about its own axis


◉What principles do MRI rely on:. Answer: i. The spinning motion of
specific nuclei present in biological tissues
ii. This spin derives from the individual spins of protons and
neutrons within the nucleus.
iii. Pairs of subatomic particles (protons and neutrons) spin in
opposing directions but at the same rates as their partners
iv. The nucleus itself has no net spin
v. Angular momentum


◉Angular momentum. Answer: 1. Nuclei with an odd mass number
(uneven proton to neutron ratio) have a net spin
2. Needed to create MR active nuclei


◉MR active nuclei. Answer: Have a tendency to align their axis
applied magnetic field.
have a + charge