Which phenomenon is used in the working of a microwave oven?

Last Updated: 25 Jun 2026

The most useful approach is to identify the physical quantity, phenomenon, law, or device named in the stem and connect it with its standard definition. Here, the relevant answer is “Resonance absorption by water molecules.” A sound solution relies on the governing concept rather than a memorised option letter, because option order may change in another paper. While reading a question, first note whether it asks for a definition, SI unit, formula, direction, cause, effect, or practical use. The distractors in this question—Induction, Photoelectric effect, Convection—do not satisfy the exact condition stated. The final selection must agree with the explanation and marked answer: Resonance absorption by water molecules.

AInduction

BResonance absorption by water molecules

CPhotoelectric effect

DConvection

Correct Answer: Resonance absorption by water moleculesYour Answer: B

Explanation

aw, relation, or working principle involved. — the scientifically appropriate response is Resonance absorption by water molecules. Option-wise review: Resonance absorption by water molecules is correct under the condition given in the stem. Induction is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Photoelectric effect is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Convection is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option B, Resonance absorption by water molecules, is factually and logically consistent with the question. Microwave ovens work by exciting water molecules in food through resonance absorption of microwave radiation.

Important Notes

Read the 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 Resonance absorption by water molecules.
Eliminate Induction, Photoelectric effect, Convection 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 Resonance absorption by water molecules directly with the key wording of the question, then verify it once against the relevant definition or formula before marking the answer.Frequency ~2.45 GHz

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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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