JEE Main · 2025 · 29 Jan 2025 · Shift 1 · Some Basic Concepts of Chemistry

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Choose the correct statements.
(A) Weight of a substance is the amount of matter present in it.
(B) Mass is the force exerted by gravity on an object.
(C) Volume is the amount of space occupied by a substance.
(D) Temperatures below are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.
  1. (A)(B), (C) and (D) Only
  2. (B)(A), (B) and (C) Only
  3. (C)(A), (D) and (E) Only
  4. (D)(C), (D) and (E) Only✓ Correct

Answer: (D)

Solution

Checking each statement against its definition: (A) Weight is the force of gravity on matter, not the amount of matter itself — that describes mass, so (A) is false. (B) The force exerted by gravity on an object is its weight, not its mass, so (B) is false. (C) Volume is indeed the space a substance occupies — true. (D) The Celsius scale allows negative readings, but the Kelvin scale is anchored at absolute zero and cannot go negative — true. (E) Precision is exactly the closeness of repeated measurements of the same quantity to one another — true.

The correct statements are (C), (D) and (E).

JEE Main · 2025 · 29 Jan 2025 · Shift 1 · Single correct option

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