SSC CGL

mediumQ. No. 14795-which-law-of-thermodynamics-states-that-energy-can-neither-be-created-nor-destroyed

Which law of thermodynamics states that energy can neither be created nor destroyed?

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 “First Law.” A sound solution relies on the governing concept rather than a memorised option letter, because option order may change in another paper. The distractors in this question—Zeroth Law, Second Law, Third Law—do not satisfy the exact condition stated. The final selection must agree with the explanation and marked answer: First Law.

AZeroth Law

BFirst Law

CSecond Law

DThird Law

Correct Answer: First LawYour Answer: B

Explanation

definition, law, relation, or working principle involved. — the scientifically appropriate response is First Law. Option-wise review: First Law is correct under the condition given in the stem. Zeroth Law is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Second Law is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Third Law is incorrect because it fails the governing relation or characteristic relevant to this case. This removes the common confusion created by neighbouring concepts. Therefore, option B, First Law, is factually and logically consistent with the question. First Law of Thermodynamics is the law of conservation of energy.

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 First 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.
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 Zeroth Law, Second Law, Third Law here because none fulfils the exact requirement of the stem. The final answer and correct-index field must point to option B.

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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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