What is the working principle of MRI (Magnetic Resonance Imaging)?

Last Updated: 25 Jun 2026

What is the working principle of MRI (Magnetic Resonance Imaging)? Here, the relevant answer is “Nuclear magnetic resonance.” A sound solution relies on the governing concept rather than a memorised option letter, because option order may change in another paper. The distractors in this question—X-ray absorption, Ultrasound reflection, Infrared emission—do not satisfy the exact condition stated. The final selection must agree with the explanation and marked answer: Nuclear magnetic resonance.

AX-ray absorption

BNuclear magnetic resonance

CUltrasound reflection

DInfrared emission

Correct Answer: Nuclear magnetic resonanceYour Answer: B

Explanation

law, relation, or working principle involved. — the scientifically appropriate response is Nuclear magnetic resonance. Option-wise review: Nuclear magnetic resonance is correct under the condition given in the stem. X-ray absorption is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Ultrasound reflection is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Infrared emission is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option B, Nuclear magnetic resonance, is factually and logically consistent with the question. MRI works on the principle of nuclear magnetic resonance (NMR) of hydrogen nuclei in the body.

Important Notes

complete stem before looking at the options. Identify whether the demand is a definition, unit, formula, direction, cause, effect, image characteristic, or device principle. In this record, the confirmed answer is Nuclear magnetic resonance.
Do not interchange closely related terms: mass and weight; distance and displacement; speed and velocity; heat and temperature; reflection and refraction; real and virtual image; current and potential difference; power and energy. Such pairs generate common SSC distractors.
Eliminate X-ray absorption, Ultrasound reflection, Infrared emission here because none fulfils the exact requirement of the stem. The final answer and correct-index field must point to option B.
Exam memory point: connect Nuclear magnetic resonance directly with the key wording of the question, then verify it once against the relevant definition or formula before marking the answer.Uses strong magnetic fields and radio waves

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FAQ

SSC CGL Physics FAQs

Common questions and clear answers for this topic.

How many physics questions usually appear in the SSC CGL exam?

Physics typically makes up a small portion of the General Science questions, usually focused on concepts rather than numerical problems.

Which physics topics are most important for SSC CGL?

Basic mechanics, heat, sound and light, and electricity and magnetism are the areas that come up most consistently across previous papers.

Do I need to solve numerical problems for SSC CGL physics?

Rarely. Most questions are conceptual and test everyday understanding rather than calculation skills.

Is NCERT physics enough for SSC CGL preparation?

NCERT textbooks from classes 9 and 10 build a strong enough conceptual base for most of what SSC CGL asks.

How can I make physics concepts easier to remember for SSC CGL?

Connecting concepts to everyday observations, like why a thermos keeps tea warm, makes them far easier to recall than memorizing definitions.

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