BSc Second Year (Sem 3 & 4) Physics – Daily Revision MCQ (English Medium)
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A crystal plane cuts the x, y and z axes at 2a, 3b and ∞ (parallel to the z-axis). Its Miller indices are:
Chapter 1: Crystal Structure
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Answer: B. (3 2 0)
Reciprocals of 2, 3, ∞ are ½, ⅓, 0; multiplying by the LCM 6 gives (3 2 0).In a sodium chloride (NaCl) crystal, the atoms are held together mainly by:
Chapter 2: Bonding in Solids
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Answer: A. ionic bonding
Na gives its outer electron to Cl, forming Na⁺ and Cl⁻ ions held by electrostatic attraction: an ionic bond.According to the Debye model, at very low temperatures the lattice specific heat of a solid varies with absolute temperature T as:
Chapter 4: Lattice Vibrations and Specific Heat of Solids
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Answer: C. T³
Debye's T³ law: at low temperatures Cv ∝ T³, matching experiment, whereas the Einstein model falls off too fast (exponentially).In a metal at absolute zero (0 K), the energy of the highest occupied electron level is called the:
Chapter 5: Free Electron Theory of Metals
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Answer: D. Fermi energy
At 0 K electrons fill all levels up to the Fermi energy E_F; all levels above it are empty.Chromatic aberration in a lens is caused by:
Chapter 8: Cardinal Points and Aberrations of Lenses
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Answer: B. the refractive index of the lens material being different for different wavelengths
Because μ depends on wavelength (dispersion), different colours focus at different points; an achromatic doublet reduces this.In Fraunhofer diffraction, the wavefront falling on the obstacle or aperture is:
Chapter 10: Diffraction of Light
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Answer: A. plane
In Fraunhofer diffraction the source and screen are effectively at infinite distance (using lenses), so plane wavefronts are used; Fresnel diffraction uses spherical or cylindrical ones.Compared with an ordinary photograph, a hologram records:
Chapter 13: Holography and Applications of Lasers
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Answer: D. both the amplitude and the phase of the light from the object
A hologram records the interference of object and reference beams, storing phase as well as amplitude, which gives a 3-D image.The differential equation d²x/dt² + ω²x = 0 describes:
Chapter 17: Differential Equations in Physics
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Answer: C. simple harmonic motion
Its solution x = A sin(ωt + φ) is a simple harmonic oscillation of angular frequency ω; there is no damping term.The Fourier series of an odd function f(x) on (−π, π) contains:
Chapter 18: Fourier Series in Physics
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Answer: B. only sine terms
For an odd function a₀ and all aₙ (cosine coefficients) vanish, because f(x)cos nx is odd; only the bₙ sin nx terms remain.The Fourier transform of the Dirac delta function δ(x) is:
Chapter 19: Fourier Transform
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Answer: D. a constant (the same for all k)
Using the sifting property, ∫δ(x)e^(−ikx)dx = 1, so the transform is a constant (up to the normalising factor of the convention).
BSc Second Year (Sem 3 & 4): MCQ in other subjects
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All questions are written by PadhaiNotes in our own words from the common syllabus of Maharashtra universities (NEP). Your own university's syllabus may differ a little.