question_answer 1)

  A plot of volume (V) versus temperature (T) for a gas at constant pressure is a straight line passing through the origin. The plots at different values of pressure are shown in fig. 5.1. Which of the following order of pressure is correct for this gas? (a)\[{{p}_{1}}>{{p}_{2}}>{{p}_{3}}>{{p}_{4}}\]      (b) \[{{p}_{1}}={{p}_{2}}={{p}_{3}}={{p}_{4}}\]                (c)\[{{p}_{1}}<{{p}_{2}}<{{p}_{3}}<{{p}_{4}}\]      (d) \[{{p}_{1}}<{{p}_{2}}={{p}_{3}}<{{p}_{4}}\]

Answer:

  (c) At a fixed temperature, volume will decrease with increase in pressure (Boyle's law). Hence, in the given graph \[{{p}_{1}}<{{p}_{2}}<{{p}_{3}}<{{p}_{4}}\]