Physics

Practice questions

1. In a series RLC circuit at resonance, which quantity is maximum?
   • Impedance
   • Current
   • Inductive reactance
   • Capacitive reactance
2. Which mathematical operation gives the divergence of a vector field?
   • Scalar product of del and the field
   • Vector product of del and the field
   • Scalar product of two vectors
   • Line integral of the field
3. In the photoelectric effect, the stopping potential depends primarily on the:
   • Intensity of incident light
   • Frequency of incident light
   • Surface area of the metal
   • Duration of illumination
4. Which thermodynamic quantity is a state function?
   • Heat
   • Work
   • Internal energy
   • Path length
5. The SI unit of magnetic field strength B is:
   • Tesla
   • Weber
   • Henry
   • Coulomb
6. Which principle explains the splitting of spectral lines in a magnetic field?
   • Doppler effect
   • Zeeman effect
   • Compton effect
   • Raman effect
7. For a simple harmonic oscillator, acceleration is:
   • Constant and positive
   • Directly proportional to displacement and in the same direction
   • Proportional to displacement and opposite in direction
   • Independent of displacement
8. Which phenomenon provides strong evidence for the wave nature of electrons?
   • Electron diffraction
   • Nuclear fission
   • Pair production
   • Radioactive decay
9. The critical angle for total internal reflection is defined for light travelling:
   • From a rarer medium to a denser medium
   • From a denser medium to a rarer medium
   • From vacuum into glass only
   • Between two media of identical refractive index
10. Which particle mediates the electromagnetic interaction in the Standard Model?
    • Gluon
    • Photon
    • W boson
    • Higgs boson
11. In a diffraction grating, increasing the number of illuminated slits generally makes principal maxima:
    • Broader and less distinct
    • Narrower and sharper
    • Unchanged in width
    • Completely absent
12. Which equation relates electric potential difference to electric field in a uniform field?
    • V = Ed
    • V = E/d
    • V = E + d
    • V = E²d
13. The de Broglie wavelength of a particle is most directly associated with its:
    • Electric charge only
    • Momentum
    • Temperature only
    • Rest mass only
14. Which type of nuclear decay emits an electron or positron from the nucleus?
    • Alpha decay
    • Beta decay
    • Gamma emission
    • Spontaneous fission only
15. In a p-type semiconductor, the majority charge carriers are:
    • Electrons
    • Holes
    • Neutrons
    • Photons
16. Which law states that the induced emf opposes the change in magnetic flux that produces it?
    • Faraday’s law alone
    • Lenz’s law
    • Coulomb’s law
    • Ampère’s law
17. For an ideal gas undergoing an adiabatic process, which quantity remains constant?
    • Temperature in every case
    • Pressure in every case
    • Heat exchanged with the surroundings
    • Volume in every case
18. Which type of polarization occurs when the electric field vector of a light wave rotates with constant magnitude in a plane perpendicular to propagation?
    • Linear polarization
    • Circular polarization
    • Unpolarized light
    • Partial reflection only
19. The number of independent coordinates required to specify the configuration of a system is called its:
    • Degree of freedom
    • Wavelength
    • Quality factor
    • Phase velocity
20. Which statistical distribution describes indistinguishable particles with half-integer spin?
    • Maxwell–Boltzmann distribution
    • Bose–Einstein distribution
    • Fermi–Dirac distribution
    • Planck’s classical distribution