UPSC CAPF AC 2026 Paper 1 · Question 120

Question 120 of the UPSC CAPF (AC) 2026 Paper I (19 July 2026). Try it first, then open the answer and explanation.

1. CAPF 2026 · P-I · Q120 · General Science · Physics

   In the ideal gas equation PV = μRT, relating pressure P, volume V and absolute temperature T, the quantity μ is

   1. number of moles
   2. number of molecules
   3. specific heat ratio
   4. coefficient of friction

   दाब P, आयतन V और परम ताप T के बीच संबंध दर्शाने वाले आदर्श गैस समीकरण PV = μRT में मात्रा μ क्या है?

   1. मोलों की संख्या
   2. अणुओं की संख्या
   3. विशिष्ट ऊष्मा अनुपात
   4. घर्षण गुणांक
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   Answer: (1) number of moles

   उत्तर: (1) मोलों की संख्या

   In PV = μRT (often written PV = nRT), μ is the number of moles of gas and R is the universal gas constant (8.314 J/mol K). Written in terms of the number of molecules N, the equation becomes PV = NkT, with Boltzmann's constant k instead of R.

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