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Current Electricity

Bihar Board Class 12 · Physics · 60 past questions

  1. Q1 2026 Set A
    A cell of internal resistance $r$ is connected to an external resistance $R$. The current will be maximum in…
  2. Q2 2026 Set A
    In a metallic conductor, the current is carried by
  3. Q3 2026 Set A
    Which factor of the following does not affect resistance of a conducting wire ?
  4. Q4 2026 Set A
    An ideal ammeter has
  5. Q5 2026 Set A
    Ohm's law does not apply, when
  6. Q6 2026 Set A
    Which of the following expressions represents electrical energy ?
  7. Q7 2026 Set A
    The relationship between current density $\vec{J}$, specific conductance $\sigma$ and electric field…
  8. Q8 2026 Set A
    The yellow colour code value of carbon resistance is
  9. Q9 2026 Set A
    The equivalent resistance of resistors in parallel combination
  10. Q10 2025 Set D
    Kilowatt-hour (kWh) is the unit of
  11. Q11 2025 Set D
    The relation between drift velocity $v$ of free electrons in conductor in electric conduction and potential…
  12. Q12 2025 Set D
    The graph between voltage $V$ of a conductor and current $I$ is a straight line which makes an angle $\theta$…
  13. Q13 2025 Set D
    With the rise in temperature, the resistance of semiconductor
  14. Q14 2025 Set D
    Which of the following represents resistance, $R$? ($\rho$ = resistivity, $l$ = length of a material, $A$ =…
  15. Q15 2025 Set D
    In a series circuit with resistors $R_1$, $R_2$, and $R_3$, the current flowing through each resistor is
  16. Q16 2025 Set D
    The unit of current density is
  17. Q17 2025 Set D
    If the length of a conductor is doubled while keeping the potential difference across it constant, then the…
  18. Q18 2025 Set D2021 Set A
    Power of electric circuit is
  19. Q19 2024 Set A
    Two bulbs of 40 W and 60 W are connected to 220 V source. The ratio of their resistances will be
  20. Q20 2024 Set A
    The resistance of any wire is 500 $\Omega$. Its electrical conductivity will be
  21. Q21 2024 Set A
    $n$ equal resistors are first connected in series and then in parallel. The ratio of maximum and minimum…
  22. Q22 2024 Set A
    To increase the sensitivity of a potentiometer
  23. Q23 2024 Set A
    Kirchhoff's second law of electricity is related to
  24. Q24 2024 Set A
    Current used in electroplating is
  25. Q25 2023 Set F
    The motion of electron inside the conductor is
  26. Q26 2023 Set F
    The relation between the drift velocity ($V_d$) and applied electric field (E) of a conductor is
  27. Q27 2023 Set F
    What is mainly measured by potentiometer?
  28. Q28 2023 Set F
    Two resistors R and 2R are connected in series in an electric circuit. The thermal energy developed in R and…
  29. Q29 2023 Set F2019
    State and explain Kirchhoff's law's. Applying this law, obtain the balanced condition of Wheatstone bridge.
  30. Q30 2022 Set I
    Which of the following is correct for current density?
  31. Q31 2022 Set I
    Which of the following is correct for mobility?
  32. Q32 2022 Set I
    Which of the following is correct?
  33. Q33 2022 Set I
    Colour code of carbon resistance for blue colour is
  34. Q34 2022 Set I
    Ampere-hour is the unit of
  35. Q35 2022 Set I
    Resistance of ideal ammeter is
  36. Q36 2021 Set A
    One ampere is equal to
  37. Q37 2021 Set A
    Unit of electromotive force is
  38. Q38 2021 Set A
    The heat produced in a conductor of resistance $R$ due to flow of current $I$ for time $t$ is
  39. Q39 2021 Set A
    Value of green colour code on carbon resistance is
  40. Q40 2021 Set A
    Which of the following is the best conductor of electricity?
  41. Q41 2021 Set A
    Voltameter measures
  42. Q42 2021 Set A
    Which of the following is the same in parallel connection of resistances ?
  43. Q43 2021 Set A
    The value of yellow colour in colour code of carbon resistance is
  44. Q44 2021 Set A
    Which of the following is correct for resistivity of a material ?
  45. Q45 2019
    Power of an electric – circuit is
  46. Q46 2019
    When two bulbs of power 60 W and 40 W are connected in series, then the power of their combination will be
  47. Q47 2019
    The resistance of ideal ammeter is
  48. Q48 2019
    At constant potential difference, the resistance of any electric circuit is halved, the value of heat…
  49. Q49 2019
    The current flowing; in a wire is 1 A. if the charge of an electron is $1.6\times10^{-19}C$, then the number…
  50. Q50 2019
    Two resistors of resistance ratio 3:4 are connected in parallel. Compare the magnitude of heat produced in…
  51. Q51 2018
    The specific resistance of a conductor increases with…
  52. Q52 2018
    The Drift velocity ($v_d$) and applied electric field (E) of a conductor are related as…
  53. Q53 2018
    Four 12Ω resistances are connected in parallel. Three such combinations are connected in series. What will be…
  54. Q54 2018
    Using theory of dirft velocity, express Ohm's law.
  55. Q55 2017
    Two cells of emf $\varepsilon_1$ and $\varepsilon_2$, internal resistance $r_1$ and $r_2$, connected in…
  56. Q56 2017
    Absorbed electrical energy is-
  57. Q57 2017
    Wheat stone's bridge is used in measuring –
  58. Q58 2017
    Explain that Kirchhoff's second law is law of conservation of energy.
  59. Q59 2017
    A bulb rated 100w. 220 V is connected across 240 Volt. Calculate electrical power loss.
  60. Q60 2017
    What is Wheatstone bridge? Explain its use in detail.