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NEET 2019 · PhysicsMean KEPrevious Year Question

Increase in temperature of a gas filled in a container would lead to:

Answer: (B) Increase in its kinetic energy. Correct Answer (B): Increase in its kinetic energy The kinetic interpretation of temperature states that the average translational kinetic energy of a gas molecule is (3/2)k_BT, directly proportional to absolute temperature.

  1. A.Increase in its mass
  2. B.Increase in its kinetic energy✓
  3. C.Decrease in its pressure
  4. D.Decrease in intermolecular distance

Correct Answer

(B) Increase in its kinetic energy

Solution & Explanation

Correct Answer (B): Increase in its kinetic energy The kinetic interpretation of temperature states that the average translational kinetic energy of a gas molecule is (3/2)k_BT, directly proportional to absolute temperature. So heating the gas increases the molecular kinetic energy. The other options are wrong: mass is conserved; at fixed volume the pressure rises (not falls) with temperature; and the intermolecular distance does not decrease on heating.

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