Code: phyElectrical & Electronics1st Semester9 Examination Papers

Engineering Physics

Official Bihar Engineering University examination question papers, marks distribution, and questions transcript. Available exam sessions: 2026, 2025, 2024, 2023, 2022.

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Official Exam Paper TranscriptB.Tech 1st Semester Examination, 2026
Bihar Engineering University, Patna
B.Tech 2nd Semester Examination - 2026

Engineering Physics

Time: 03 HoursCode: 100201Full Marks: 70

Instructions:

  1. The marks are indicated in the right-hand margin.
  2. There are NINE questions in this paper.
  3. Attempt FIVE questions in all.
  4. Question No. 1 is compulsory.
Q.1 Choose the correct option / answer the following (Any seven question only):[2×7=14]

  1. A glass window may be broken by a distant explosion due to __________

    1. Interference
    2. Resonance
    3. Diffraction
    4. Polarization

  2. Displacement and velocity graph of SHM is __________

    1. Parabolic
    2. Circular
    3. Elliptical
    4. Linear

  3. For which angle of scattering is the Compton shift maximum?

    1. 90°
    2. 180°
    3. 0°
    4. None of the above

  4. Which characterizes a photon?

    1. Both energy and momentum
    2. Momentum, but not energy
    3. Energy, but not momentum
    4. Neither energy nor momentum

  5. Write the name of the particles produced in pair production?

    1. Electron and proton
    2. Positron and electron
    3. Proton and neutron
    4. Neutrino and neutron

  6. Ruby LASER is a

    1. 3 level gas laser
    2. 4 level solid state laser
    3. Semiconductor laser
    4. 3 level solid state laser

  7. Gauss divergence theorem converts __________

    1. Line integral to volume integral
    2. Surface integral to volume integral
    3. Surface integral to line integral
    4. Surface integral to volume integral & vice versa

  8. Which of the following laws do not form a Maxwell equation?

    1. Gauss's Law of electrostatics
    2. Faraday's law of electromagnetic induction
    3. Ampere's circuital Law
    4. None of the above

  9. The relationship describing the angle at which a beam of X-rays of a particular wavelength diffracts from a crystalline surface is __________

    1. Snell's law
    2. Fresnel's law
    3. Bragg's law
    4. None of the above

  10. In single slit diffraction the ratio of intensities of first secondary maximum to the central maximum is __________

    1. 1/28
    2. 1/22
    3. 1/121
    4. 1/5
Q.2

  1. Discuss the structure and working of He-Ne LASER. Draw its energy level diagram.

    [10]

  2. Explain Coriolis effect and its applications in weather system.

    [4]
Q.3

  1. What is damping? Derive the differential equation for Damped Harmonic Oscillator. Give its solution.

    [10]

  2. Differentiate between under damped, over damped and critically damped harmonic oscillation including graphical representation.

    [4]
Q.4

  1. What is a diffraction grating? Derive the expression for resultant intensity. Discuss the diffraction pattern due to a grating with intensities distribution curve.

    [10]

  2. Write a short note on Michelson's interferometer.

    [4]
Q.5

  1. Discuss Kronig-Penney model for the motion of an electron in a periodic potential and the existence of allowed and forbidden energy bands.

    [10]

  2. State and explain Bloch's theorem for a particle in a periodic potential.

    [4]
Q.6

  1. Derive an expression for torque on a magnetic dipole inside a uniform magnetic field. Define magnetic moment.

    [7]

  2. Distinguish among dia, para and ferro magnetic materials on the basis of orientation of atomic magnetic moments under the external magnetic fields.

    [7]
Q.7

  1. State Poynting theorem and define Poynting vector. Use Maxwell's equations to derive the theorem.

    [10]

  2. Write down four Maxwell's equations in differential form. Name the terms.

    [4]
Q.8

  1. Write down Schrödinger's wave equation for a particle in one dimensional potential well given by:

    V(x) = 0,    0 < x < a
           = ∞,    x ≤ 0 and x ≥ a

    Solve it to obtain the energy eigen values.

    [10]

  2. Derive Einstein's photo-electric equation.

    [4]
Q.9 Write short note on any two of the following:[7×2=14]

  1. Resonance

  2. Polarization mechanisms in dielectrics

  3. Compton scattering

  4. Newton's ring experiment

Related Official Syllabus

Engineering Physics

100104

Official BEU curriculum units & topics for this examination subject.

Unit- 1.0: Wave Optics (8 hrs)

1.1 Interference, division of amplitude, Newton's Ring experiment, Michelson interferometer • 1.2 Diffraction, Fraunhofer diffraction, single and double slit, circular aperture • 1.3 Diffraction grating • 1.4 Rayleigh criterion; resolving power of telescope • 1.5 Polarization, double-refracting crystal, Nicol prism

Unit- 2.0: Lasers and Optical Fiber (8 hrs)

2.1 Characteristics of laser light; Einstein's A & B coefficients; population inversion; pumping mechanism; optical resonator • 2.2 Ruby laser, He-Ne laser and semiconductor laser • 2.3 Structure of optical fibre; TIR, acceptance angle and numerical aperture; types of optical fibres • 2.4 Propagation mechanism of light in fibre; attenuation in optical fibres • 2.5 Applications of optical fibres; fibre optic sensors

Unit- 3.0: Electromagnetism & Propagation of Waves (8 hrs)

3.1 Electric fields, Gauss' Law, dielectrics and capacitors • 3.2 Magnetic fields and magnetic materials • 3.3 Maxwell's Equations • 3.4 Electromagnetic waves and Poynting Theorem

Unit- 4.0: Quantum Mechanics (8 hrs)

4.1 Introduction to Quantum Mechanics • 4.2 De-Broglie hypothesis; Heisenberg uncertainty principle • 4.3 Wave function and its characteristics • 4.4 Schrödinger's equation (time-dependent and independent) • 4.5 Particle in a box; energy eigenvalues and eigenfunctions • 4.6 Potential barrier and tunneling

Unit- 5.0: Semiconductors & Nano-materials (10 hrs)

5.1 Introduction; types of materials (metal, semiconductor and insulator) • 5.2 Intrinsic and extrinsic semiconductors; P-type and N-type; diffusion, drift and Fermi level • 5.3 Photodiode, P-N junction transistor, LED • 5.4 Hall effect • 5.5 Solar cell and its characteristics • 5.6 Introduction to nanoscience & nanotechnology; significance of nanoscale • 5.7 Unique properties: bulk vs nanomaterials; surface-to-volume ratio; band gap and optical/electrical/mechanical properties • 5.8 Classification of nanostructured materials: 0D (quantum dot), 1D (nanowire)

View Complete 1st Semester Syllabus

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