Code: phyRobotics & Automation2nd 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 2nd 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

100201

Official BEU curriculum units & topics for this examination subject.

Unit 1.0: Frame of Reference and Oscillations

Non-Inertial frame of reference • Rotating coordinate system • Centripetal and Coriolis acceleration and its application in weather system • Harmonic Oscillator • Damped Harmonic motion: overdamped, critically Damped and lightly damped oscillators • Force Oscillators and Resonance

Unit 2.0: Optics and LASER

Huygens's Principle • Superposition of Waves and interference of Light by wave front-splitting and amplitude-splitting • Young's double slit experiment • Michelson interferometer • Fraunhofer diffraction from single slit and circular aperture • Diffraction Grating and their resolving power • Einstein's theory of matter-radiations interaction • Einstein's Coefficients (A and B) • Amplification by population inversion • Different types of lasers: Gas Laser, Helium-Neon Laser, Solid State Laser (Ruby, Neodymium), Semiconductor Laser

Unit 3.0: Quantum Mechanics

Compton Effect • Photoelectric Effect • Wave Particle duality • de Broglie's hypothesis • Heisenberg's Uncertainty Principle • Wave function and wave packets • Phase and group velocities • Schrodinger's Wave Equation • Normalization • Expectation values • Eigenvalues and Eigenfunction • Application of Schrodinger Wave Equation for particle in one dimensional box: its wavefunction and eigenvalue of energy and momentum

Unit 4.0: Vector Calculus and Electrostatics

Gradient, Divergence and Curl • Line, Surface and Volume integrals • Gauss's Divergence theorem and Stokes' theorem in Cartesian Coordinate • Gauss's Law and its applications • Divergence and Curl of Electrostatic fields • Electrostatic Potential • Boundary Conditions • Poisson's and Laplace's equations • Dielectrics • Polarization • Bound Charges • Electric displacement • Boundary Conditions in dielectrics

Unit 5.0: Magnetostatics and Electrodynamics

Lorentz force • Biot-Savart and Ampere's circuital laws and their applications • Divergence and Curl of Magneto static fields • Magnetic vector potential • Force and torque on a magnetic dipole • Magnetic Materials • Magnetization • Bound currents • Boundary conditions • Ohm's law • Motional EMF • Faraday's Law • Lenz's law • Self and mutual inductance • Energy stored in magnetic field • Maxwell's equations in vacuum and nonconducting medium • Continuity Equation • Poynting Theorem • Wave Equations: plain electromagnetic wave in vacuum and their transverse nature and Polarization

View Complete 2nd Semester Syllabus

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