SSC CGL

hardQ. No. 14858-what-is-the-coefficient-of-restitution-for-a-perfectly-elastic-collision

What is the coefficient of restitution for a perfectly elastic collision?

Last Updated: 25 Jun 2026

What is the coefficient of restitution for a perfectly elastic collision? Here, the relevant answer is “1.” 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—0, 0.5, Greater than 1—do not satisfy the exact condition stated.

B0.5

DGreater than 1

Correct Answer: 1Your Answer: C

Explanation

The correct answer is 1.

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.
Eliminate 0, 0.5, Greater than 1 here because none fulfils the exact requirement of the stem. The final answer and correct-index field must point to option C.

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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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