Easy MCQ +4 / -1 PYQ · JEE Mains 2022

Following statements are given :

(A) The average kinetic energy of a gas molecule decreases when the temperature is reduced.

(B) The average kinetic energy of a gas molecule increases with increase in pressure at constant temperature.

(C) The average kinetic energy of a gas molecule decreases with increase in volume.

(D) Pressure of a gas increases with increase in temperature at constant pressure.

(E) The volume of gas decreases with increase in temperature.

Choose the correct answer from the options given below :

  1. A (A) and (D) only
  2. B (A), (B) and (D) only
  3. C (B) and (D) only
  4. D (A), (B) and (E) only

Solution

<p>Because KE $\propto$ T so A is correct, B is incorrect, statement C cannot be said, statement D is contradicting itself, statement E is incorrect (Isothermal process)</p> <p>So no answer correct (Bonus)</p> <p>If the statement of D would have been.</p> <p>"Pressure of gas increases with increase in temperature at constant volume, "then statement D would have been correct, so in that case answer would have been 'A'.</p>

About this question

Subject: Physics · Chapter: Thermodynamics · Topic: Zeroth and First Law

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