LU B.Sc Sem 3 Physics Heat and Thermodynamics Important Questions 2026 | PYQ Pattern
LU B.Sc 3rd Semester Physics (Heat and Thermodynamics) Important Questions 2026 – Lucknow University (LU) aur affiliated colleges ke B.Sc NEP Semester III (PCM group) students ke liye Physics – Heat and Thermodynamics (Paper-I) ke sabse important questions, bilkul previous year question paper (PYQ) pattern me. Saare questions neeche page par hi hain – section-wise.
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Paper Details – B.Sc Sem 3 Physics (LU NEP 2026)
| University | University of Lucknow (LU) + affiliated colleges |
| Course | B.Sc. III Semester (NEP) – PCM |
| Paper | Physics – Heat and Thermodynamics (Paper-I) |
| Time / Marks | 2 Hours / 75 Marks |
| Pattern | Kul 4 questions: Section A se 1 (15 marks) + Section B se 3 (20 marks each) |
Section A – Important Questions (15 Marks)
Note: Section A se koi ek question attempt karna hai.
Q1. Give the first law of thermodynamics and show that it is a special case of the conservation of energy. Discuss its physical meaning and its limitations. [15 Marks]
Q2. (a) What is entropy and how is it connected with degradation of energy?
(b) Find the entropy change when 20 gm of ice at 0°C turns into 20 gm of steam at 100°C. (Latent heat of fusion of ice = 80 cal/gm; specific heat of water = 1 cal/gm; latent heat of steam = 540 cal/gm; log₁₀ 373 = 2.5717, log₁₀ 273 = 2.4362) [15 Marks]
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Section B – Important Questions (20 Marks)
Note: Section B se koi teen questions attempt karne hain.
Q3. What is the Joule-Thomson effect? Using Maxwell’s thermodynamic relations, obtain the Joule-Thomson coefficient, show that enthalpy remains constant in the process and that a perfect gas shows no Joule-Thomson effect. [20 Marks]
Q4. Sketch Andrews’ isotherms of CO₂ at various temperatures and obtain the critical constants. Show that the ratio of inversion temperature to critical temperature is Tᵢ/T_c = 27/4. [20 Marks]
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Q5. Starting from the thermodynamic potentials U, H, F and G, obtain Maxwell’s thermodynamic relations and explain their uses. [20 Marks]
Q6. State and explain the law of equipartition of energy and obtain the molar specific heats of monoatomic, diatomic and polyatomic gases. What are its limitations? [20 Marks]
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Q7. What are transport phenomena in gases? Using kinetic theory, obtain an expression for the coefficient of viscosity and the relation between viscosity and thermal conductivity. [20 Marks]
Q8. Starting from the average energy of a Planck oscillator, obtain Planck’s radiation formula and show that Wien’s law and the Rayleigh-Jeans law are its special cases. [20 Marks]
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Q9. Using the Carnot cycle, obtain the efficiency of an ideal engine working between T₁ and T₂. Give the statement and proof of Carnot’s theorem. [20 Marks]
Q10. Write short notes on: (a) Mean free path (b) Clausius-Clapeyron equation (c) Degrees of freedom (d) Wien’s displacement law [20 Marks]
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Exam Tips – Physics (Heat and Thermodynamics)
- Section A ke long answers ke short notes bana lo – 15 marks pakke karo.
- Section B ke derivations / numericals / diagrams ki practice karo.
- Upar ke questions ko 2 ghante me PYQ ki tarah solve karke dekho.
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FAQs
LU B.Sc 3rd Semester Physics (Heat and Thermodynamics) exam me kitne questions attempt karne hote hain?
Ye 75 marks ka 2 ghante ka paper hai. Kul 4 questions attempt karne hote hain – Section A se 1 question (15 marks) aur Section B se 3 questions (20-20 marks).
Kya ye LU B.Sc Sem 3 Physics ka official previous year question paper (PYQ) hai?
Nahi. Ye LUUPDATE team ka banaya 2026 exam ke liye most important questions ka set hai, jo Lucknow University ke previous year papers ke pattern aur NEP syllabus par based hai.
B.Sc Sem 3 Physics Heat and Thermodynamics ke answers / solutions kahan milenge?
LUUPDATE ke Most Important Questions course (BA, B.Sc, B.Com Sem I, III & V) me har question ka pura solution milta hai – sirf ₹99 me, LUUPDATE App par.
Ye paper kis group ke liye hai – PCM ya ZBC?
Physics (Heat and Thermodynamics) LU B.Sc NEP Semester III ke PCM group ke students ke liye hai.
Disclaimer: Ye LUUPDATE team dwara taiyar kiye gaye expected important questions hain (previous year pattern par), Lucknow University ka official question paper nahi. Exam pattern aur syllabus ke liye university ka official notice zaroor dekhein.
