Engineering Physics — Major (End Semester) 2026 question paper

Paper details

• Subject: Engineering Physics (BSM-181)
• Branch: Mechanical Engineering
• Semester: 2
• Exam: Major (End Semester) 2026
• Questions: 24

Questions asked in Engineering Physics Major (End Semester) 2026

1. Q1. Attempt any Five parts of the following. (Unit I & II)
2. Q1(a). What do you mean interference? Write down the conditions for obtaining sustained interference patterns? If two waves having amplitudes 3 and 5 units superpose, what will be the ratio of the maximum to minimum intensities? [2 marks]
3. Q1(b). Light of wavelength 5500 A° falls normally on a slit of width of 22 × 10^{-5} cm. Calculate the angular position of the second minima on either side of the central maxima. [2 marks]
4. Q1(c). Write down Heisenberg uncertainty principle. Show that an electron cannot reside inside the nucleus of an atom. Given that size of a nucleus is 10 × 10^{-15} meters. [2 marks]
5. Q1(d). Derive formula for the wave functions and energy Eigen values in case of one dimensional Schrodinger equation. Obtain the energy required for making and electron jump from its ground state to second excited state if it is trapped in a one dimensional box of size 1.0 nm. [2 marks]
6. Q1(e). Describe de Brogile hypothesis. Describe how could Davisson-Germor experiment provide direct evidence in favor of it. Explain with the help of neat and clean diagram. [2 marks]
7. Q1(f). Answer the following [2 marks]
8. Q1(g). What do you mean by Polarization? Explain the differences between linearly, elliptically and circularly polarized light. [2 marks]
9. Q2. Attempt any Two parts of the following. (Unit-III)
10. Q2(a). Write down Maxwell's electromagnetic equations in integral forms for free space and explain their physical significance. [5 marks]
11. Q2(b). Derive Maxwell's fourth law. Which modifications were proposed by Maxwell in Ampere's law and why? Explain the physical significance of displacement current. [5 marks]
12. Q2(c). Show that the electric and magnetic vectors in electromagnetic waves transverse with a constant speed. [5 marks]
13. Q3. Attempt any Two parts of the following. (Unit-III)
14. Q3(a). Derive Maxwell third equation and explain the physical significance of terms in it. [5 marks]
15. Q3(b). Show that the electromagnetic waves are transversic in nature. [5 marks]
16. Q3(c). Explain the difference between Gradient, Divergence and Curl. Show that ∇ · (∇ × E) = 0 ; Here E is an electric field. [5 marks]
17. Q4. Attempt any Two parts of the following. (Unit-IV)
18. Q4(a). What do you mean by energy bandgap? Describe the origin of bandgap in case of silicon. Highlight the difference between direct and indirect bandgap semiconductors giving one example of each. [5 marks]
19. Q4(b). Explain the difference between the intrinsic and extrinsic semiconductors. Derive the carrier concentrations in case of intrinsic semiconductors. [5 marks]
20. Q4(c). What do you mean by superconductivity? Explain it on the basis of BCS theory. [5 marks]
21. Q5. Attempt any Two parts of the following. (Unit-IV)
22. Q5(a). Define nanomaterials. Classify them as 0D, 1D and 2D nanomaterials and give two appropriate examples of each. [5 marks]
23. Q5(b). What do you mean by Meissner effect? Classify superconductors into different types on its basis. Give one example of each. [5 marks]
24. Q5(c). i- Write down five potential applications of superconductors. ii- What do you mean by isotope effect. The critical temperature. Tc for Hg With isotopic mass 199.5 is 4.185 K. Calculate its Tc when its isotopic mass changes to 203.4 [5 marks]