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Thermodynamics (Physics)

JEE Main 2025 (Online) 23rd January Evening ShiftMCQMedium📈 Topic in 3% papers+4−1
Ques. 1JEE Main 2025, 23 January (Evening Shift)

Water of mass m gram is slowly heated to increase the temperature from T1 to T2. The change in entropy of the water, given specific heat of water is 1 J kg-1 K-1, is :

  1. m(T2-T1)
  2. zero
  3. m ( T1T2 )
  4. m ( T2T1 )

Answer

(4) m ( T2T1 )

Solution

Slow heating is reversible: dS= dQT= mc dTT.

S=mc T1T2 dTT=mc T2T1

With c=1: S=m T2T1

Answer: (4)

Keep practising — Thermodynamics (Physics)

Ques. 2JEE Main 2025, 23 January (Evening Shift)

[figure] Using the given P-V diagram, the work done by an ideal gas along the path ABCD is :

  1. 3P0 V0
  2. -3P0 V0
  3. -4P0 V0
  4. 4P0 V0
Ques. 3JEE Main 2025, 22 January (Evening Shift)

Given are statements for certain thermodynamic variables, Choose the correct answer from the options given below :

  1. C and D Only
  2. A and B Only
  3. D and A Only
  4. B and C Only

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