SSC CGL

mediumQ. No. 14772-which-phenomenon-is-responsible-for-the-blue-colour-of-the-sky

Which phenomenon is responsible for the blue colour of the sky?

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 “Scattering.” 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—Reflection, Refraction, Dispersion—do not satisfy the exact condition stated. The final selection must agree with the explanation and marked answer: Scattering.

AReflection

BRefraction

CScattering

DDispersion

Correct Answer: ScatteringYour Answer: C

Explanation

— the scientifically appropriate response is Scattering. Option-wise review: Scattering 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. Dispersion is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option C, Scattering, is factually and logically consistent with the question. The sky appears blue due to Rayleigh scattering of sunlight by atmospheric molecules.

Important Notes

Learn each concept as a five-part card: definition; common symbol; SI unit; principal equation; and one real-life application. This works for mechanics, heat, optics, sound, electricity, magnetism, and modern physics.
Use dimensional consistency as a quick check for formulas. Both sides of a valid physical equation must have the same dimensions. Units can eliminate distractors quickly, although a dimensionally correct option must still satisfy the actual law.
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, Dispersion 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 Scattering directly with the key wording of the question, then verify it once against the relevant definition or formula before marking the answer.Shorter wavelengths scatter more

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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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