Physics Quiz Class 12

Physics quiz class 12​ can be an engaging way to test and reinforce students’ understanding of critical concepts in physics. Here is a comprehensive set of questions to practice.

One-Liner Questions for Physics Quiz Class 12​

1. What is the SI unit of electric flux?
2. State Gauss’s Law in electrostatics.
3. What is the formula for the capacitance of a parallel plate capacitor?
4. Name the device used to measure electric potential difference.
5. What is the relationship between current and drift velocity in a conductor?
6. Define resistivity of a material.
7. What happens to the resistance of a wire when its length is doubled?
8. What is the SI unit of resistivity?
9. State Ohm’s law.
10. What is the dimension of the electric field?
11. What is the magnetic flux through a surface parallel to a magnetic field?
12. Define one Tesla.
13. State Ampère’s circuital law.
14. What does a galvanometer measure?
15. What is the principle of an AC generator?
16. What is the power factor of an LCR circuit at resonance?
17. Define mutual inductance.
18. What is the time constant of an RC circuit?
19. What is the speed of light in vacuum?
20. State the principle of superposition of waves.
21. What is a photon?
22. What is Planck’s constant value?
23. State Heisenberg’s uncertainty principle.
24. Define nuclear fission.
25. What is the work function of a metal?
26. What is the formula for the energy of a photon?
27. Name the device used for measuring potential difference and current in an AC circuit.
28. What is rectification in electronics?
29. What is the difference between conductors and semiconductors?
30. What is the unit of magnetic permeability?
31. What is the formula of the Lorentz force?
32. State Biot-Savart law.
33. What is Brewster’s angle?
34. What is the focal length of a concave mirror?
35. What is the magnification formula for lenses?
36. State Snell’s law.
37. What is the condition for total internal reflection?
38. Define power of a lens.
39. What is the formula for angular magnification in an optical instrument?
40. What is meant by dispersion of light?
41. What is the primary use of a diode?
42. What is the de Broglie wavelength?
43. Define half-life of a radioactive substance.
44. What is the binding energy of a nucleus?
45. What is the effect of temperature on the conductivity of semiconductors?
46. What is hysteresis in magnetic materials?
47. What is the SI unit of inductance?
48. What is the wave-particle duality concept?
49. What is the ratio of charges in Coulomb’s law?
50. What is the purpose of a transformer?

Physics Quiz Class 12 Answers

1. SI unit of electric flux: Weber (Wb)
2. Gauss’s Law: The total electric flux through a closed surface is equal to 1/ε₀ times the total charge enclosed by the surface.
3. Capacitance formula (parallel plate capacitor): C = ε₀A/d
4. Device for electric potential difference: Voltmeter
5. Current and drift velocity relation: I = nqvA
6. Resistivity: A material’s resistance to the flow of electric current per unit length and cross-sectional area.
7. Resistance of a wire when length doubled: It becomes double.
8. SI unit of resistivity: Ohm-meter (Ω·m)
9. Ohm’s law: V = IR
10. Dimension of electric field: [MLT⁻³A⁻¹]
11. Magnetic flux through parallel surface: Zero
12. One Tesla: Magnetic flux density of one Weber per square meter.
13. Ampère’s law: ∮B.dl = μ₀Iₑnclosed
14. Galvanometer use: Measures small electric currents.
15. AC generator principle: Electromagnetic induction
16. Power factor (LCR circuit at resonance): 1
17. Mutual inductance: Induced emf in one coil due to a change in current in another coil.
18. Time constant (RC circuit): τ = RC
19. Speed of light in vacuum: 3 × 10⁸ m/s
20. Principle of superposition: The net displacement of overlapping waves is the vector sum of their individual displacements.
21. Photon: A quantum of electromagnetic radiation.
22. Planck’s constant: 6.626 × 10⁻³⁴ Js
23. Heisenberg’s principle: Δx × Δp ≥ ħ/2
24. Nuclear fission: Splitting of a heavy nucleus into lighter nuclei.
25. Work function: Minimum energy to remove an electron from a surface.
26. Photon energy formula: E = hf
27. Device for measuring AC potential difference: Voltmeter
28. Rectification: Conversion of AC to DC.
29. Difference (conductors and semiconductors): Conductors allow free electron flow, semiconductors have moderate conductivity.
30. Magnetic permeability unit: Henry per meter (H/m)
31. Lorentz force formula: F = q(E + v × B)
32. Biot-Savart law: dB = μ₀/4π × (I dl × r̂)/r²
33. Brewster’s angle: Angle of incidence at which light with a particular polarization is perfectly transmitted.
34. Focal length (concave mirror): Distance from the mirror’s pole to its focal point.
35. Magnification formula (lenses): m = v/u
36. Snell’s law: n₁sinθ₁ = n₂sinθ₂
37. Total internal reflection condition: θ₁ > critical angle (θc)
38. Power of a lens: Reciprocal of its focal length (D = 1/f)
39. Angular magnification formula: m = 1 + (D/f)
40. Dispersion of light: Splitting of white light into its spectrum of colors.
41. Primary use (diode): Allows current flow in one direction.
42. de Broglie wavelength: λ = h/p
43. Half-life: Time taken for half the atoms to decay.
44. Binding energy: Energy needed to disassemble a nucleus into its constituent nucleons.
45. Effect of temperature (semiconductors): Conductivity increases.
46. Hysteresis: Lag between magnetization and external magnetic field change.
47. SI unit of inductance: Henry (H)
48. Wave-particle duality: Particles like electrons exhibit both wave and particle properties.
49. Charges ratio (Coulomb’s law): Directly proportional to product of charges.
50. Purpose of transformer: Changes the voltage level in AC circuits.

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Key Takeaways of Physics Quiz Class 12

1. Practice strengthens understanding of core physics concepts.
2. Important for competitive exams.
3. Based on NCERT, CBSE, and ICSE standards.
4. Covers electrostatics, optics, electromagnetism, and more.
5. Understand laws and principles with examples.
6. Helpful for quick revisions.
7. Provides direct concept-based questions.
8. Useful for conceptual clarity.
9. Questions span from basics to complex topics.
10. Emphasizes on formulae and definitions.

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