SSC CGL

mediumQ. No. 14809-which-law-describes-the-relationship-between-pressure-and-temperature-of-gas-at-constant-volume

Which law describes the relationship between pressure and temperature of gas at constant volume?

Last Updated: 25 Jun 2026

This question tests a core idea from school-level and competitive-examination physics. 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 “Gay-Lussac's Law.” A sound solution relies on the governing concept rather than a memorised option letter, because option order may change in another paper. Physics explains measurable natural events through quantities, units, observations, mathematical relations, and experimentally verified laws. Then check dimensions and limiting cases wherever a numerical relation is involved. The distractors in this question—Boyle's Law, Charles' Law, Avogadro's Law—do not satisfy the exact condition stated.

ABoyle's Law

BCharles' Law

CGay-Lussac's Law

DAvogadro's Law

Correct Answer: Gay-Lussac's LawYour Answer: C

Explanation

definition, law, relation, or working principle involved. — the scientifically appropriate response is Gay-Lussac's Law. Option-wise review: Gay-Lussac's Law is correct under the condition given in the stem. Boyle's Law is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Charles' Law is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Avogadro's Law is incorrect because it fails the governing relation or characteristic relevant to this case. Identify the chapter, recall the exact definition or equation, check the unit or direction if applicable, and then eliminate choices that contradict it. Therefore, option C, Gay-Lussac's Law, is factually and logically consistent with the question. Gay-Lussac's Law states P/T = constant at constant volume meaning P ∝ T.

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 Gay-Lussac's Law.
Physics answers are condition-dependent. The same lens, force, circuit, wave, or thermodynamic system can behave differently when distance, medium, temperature, direction, or boundary conditions change. Preserve every qualifier in the question.
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.

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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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