SSC CGL

mediumQ. No. 14837-what-is-the-phenomenon-by-which-certain-materials-emit-light-when-exposed-to-radiation

What is the phenomenon by which certain materials emit light when exposed to radiation?

Last Updated: 25 Jun 2026

What is the phenomenon by which certain materials emit light when exposed to radiation? 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 “Fluorescence.” A sound solution relies on the governing concept rather than a memorised option letter, because option order may change in another paper.

AReflection

BRefraction

CFluorescence

DDiffraction

Correct Answer: FluorescenceYour Answer: C

Explanation

— the scientifically appropriate response is Fluorescence. Option-wise review: Fluorescence is correct under the condition given in the stem. Reflection is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Refraction is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Diffraction is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option C, Fluorescence, is factually and logically consistent with the question. Fluorescence is the emission of light by a substance that has absorbed radiation of a different wavelength.

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 Fluorescence.
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 Reflection, Refraction, Diffraction here because none fulfils the exact requirement of the stem. The final answer and correct-index field must point to option C.
Exam memory point: connect Fluorescence directly with the key wording of the question, then verify it once against the relevant definition or formula before marking the answer.Used in fluorescent lamps

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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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