Join the Most Relevant JEE Main 2025 Test Series & get 99+ percentile! Join Now
Search any question & find its solution
Question: Answered & Verified by Expert
1 g of a liquid is converted to vapour at 3×105 Pa pressure. If 10% of the heat supplied is used for increasing the volume by 1600 cm3 during this phase change, then the increase in internal energy in the process will be :
PhysicsThermodynamicsJEE MainJEE Main 2023 (24 Jan Shift 1)
Options:
  • A 4320 J
  • B 432000 J
  • C 4800 J
  • D 4.32×108 J
Solution:
1975 Upvotes Verified Answer
The correct answer is: 4320 J

As pressure against which expansion is happening is constant, work done can be written as =PΔV

=3×105×1600×10-6

=480 J
As only 10% of heat is used in work done.
Hence ΔQ=W0.1=4800 J
The rest goes in increase in internal energy, which is 90% of heat.
Change in internal energy =0.9×4800=4320 J

Looking for more such questions to practice?

Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.