Class 12 Physics Ch-2 Electrostatic Potential and Capacitance MCQs Exam 2027

Unit 1: Electrostatics

1. The dielectric strength for air is: [BSEB 2021]

(A) $3 \times 10^6$ V/m

(B) $4 \times 10^6$ V/m

(C) $5 \times 10^6$ V/m

(D) $10^6$ V/m

2. The dielectric constant of a metal is: [BSEB 2019/2024]

(A) 0

(B) $\infty$

(C) 1

(D) -1

3. The dimensions of electric potential are: [BSEB 2020]

(A) $[ML^2T^{-3}A^{-1}]$

(B) $[ML^2T^{-3}A^1]$

(C) $[MLT^{-3}A^{-1}]$

(D) $[ML^2T^{-2}A^{-1}]$

4. One Volt is equal to: [BSEB 2020]

(A) 1 J

(B) 1 J/C

(C) 1 C/J

(D) 1 JC

5. Potential gradient is equal to: [BSEB 2021]

(A) $dx/dV$

(B) $dx \cdot dV$

(C) $dV/dx$

(D) None of these

6. The work done in rotating a dipole in an electric field is: [BSEB 2020]

(A) $W = PE(1 – \cos \theta)$

(B) $W = PE \tan \theta$

(C) $W = PE \sec \theta$

(D) None of these

7. Electron-volt (eV) is the unit of: [BSEB 2020]

(A) Charge

(B) Potential difference

(C) Current

(D) Energy

8. Electric potential at a point in the axial position of a dipole is: [BSEB 2022]

(A) $\frac{1}{4\pi\epsilon_0} \frac{p \cos \theta}{r^2}$

(B) $\frac{1}{4\pi\epsilon_0} \frac{p}{r^2}$

(C) Zero

(D) None of these

9. If a uniform electric field is along the X-axis, the equipotential surface will be: [BSEB 2022]

(A) XY-plane

(B) XZ-plane

(C) YZ-plane

(D) Anywhere

10. Electric potential (V) is equal to: [BSEB 2021]

(A) $q/W$

(B) $W/q$

(C) $Wq$

(D) $\sqrt{Wq}$

11. The potential on the surface of a hollow metal sphere is 10V. The potential at the center will be: [BSEB 2024]

(A) 0 V

(B) 10 V

(C) 5 V

(D) 2 V

12. The electric potential in the equatorial position of an electric dipole is: [BSEB 2024]

(A) $\frac{1}{4 \pi \epsilon_0} \frac{p \cos \theta}{r^2}$

(B) $\frac{1}{4 \pi \epsilon_0} \frac{p}{r^2}$

(C) Zero

(D) None of these

13. Potential due to an electric dipole at distance $r$ is proportional to: [BSEB 2018]

(A) $r$

(B) $1/r$

(C) $1/r^2$

(D) $1/r^3$

14. Which of the following quantities has the unit V/m? [BSEB 2020]

(A) Electric flux

(B) Electric potential

(C) Electric capacitance

(D) Electric field

15. Work done in moving an electron on an equipotential surface is: [BSEB 2012]

(A) Positive

(B) Negative

(C) Zero

(D) Infinite

16. The electric potential of the Earth is considered to be: [BSEB 2015]

(A) Positive

(B) Negative

(C) Zero

(D) Infinite

17. The direction of Dipole Moment is: [BSEB 2020]

(A) Positive to Negative charge

(B) Negative to Positive charge

(C) Perpendicular

(D) None of these

18. When a positive charge is moved from low potential to high potential, its potential energy: [BSEB 2017]

(A) Increases

(B) Decreases

(C) Remains unchanged

(D) Uncertain

19. The total electric flux emerging from a unit positive charge is: [BSEB 2021]

(A) $\epsilon_0$

(B) $\epsilon_0^{-1}$

(C) $(4 \pi \epsilon_0)^{-1}$

(D) $4 \pi \epsilon_0$

20. Information obtained from electric field lines includes: [BSEB 2023]

(A) Field strength

(B) Direction

(C) Nature of charge

(D) All of these

21. The angle between an equipotential surface and electric field lines is: [BSEB 2022]

(A) $0^\circ$

(B) $90^\circ$

(C) $180^\circ$

(D) $45^\circ$

22. Energy gained by a proton accelerated through a potential difference of 1V is: [BSEB 2019]

(A) 0

(B) 1 eV

(C) 2 eV

(D) 4 eV

23. Work done in moving a charge from the center to the surface of a hollow sphere is: [BSEB 2018]

(A) 0

(B) $\frac{1}{4 \pi \epsilon_0} \frac{Qq}{R}$

(C) $\frac{1}{4 \pi \epsilon_0} \frac{Q}{R}$

(D) $\frac{1}{4 \pi \epsilon_0} \frac{q}{R}$

24. Potential energy between two dipoles is proportional to: [BSEB 2024]

(A) $r^3$

(B) $r^{-3}$

(C) $r^4$

(D) $r^{-4}$

25. The relation between electric field (E) and potential (V) is: [BSEB 2021]

(A) E = -dV/dx

(B) E = dV/dx

(C) V = dE/dx

(D) V = -dE/dx

26. Torque on a dipole is maximum when the angle is: [BSEB 2026]

(A) $0^{\circ}$

(B) $45^{\circ}$

(C) $90^{\circ}$

(D) $180^{\circ}$

27. In a region where intensity E = 0, the potential V is: [BSEB 2026]

(A) Zero

(B) Varies with distance

(C) Constant

(D) None of these

28. When a dielectric is placed in an external field, the electric field inside: [BSEB 2026]

(A) Decreases

(B) Increases

(C) Becomes zero

(D) Remains the same

29. The dielectric constant of water is: [BSEB 2026]

(A) 80

(B) 60

(C) 1

(D) 42.18

30. There are $n$ dipoles inside a closed surface. Total outgoing flux will be: [BSEB 2025]

(A) $q/\epsilon_0$

(B) Zero

(C) $nq/\epsilon_0$

(D) $2q/\epsilon_0$

31. Two charges of $+10 \mu C$ and $-10 \mu C$ are at 40 cm. Potential energy is: [BSEB 2019]

(A) 2.25 J

(B) 2.35 J

(C) -2.25 J

(D) -2.35 J

32. Bringing charges closer together causes the potential energy of the system to: [BSEB 2016]

(A) Increase

(B) Decrease

(C) Remain unchanged

(D) Zero

33. When a soap bubble is charged, its radius: [BSEB 2021]

(A) Increases

(B) Decreases

(C) Remains unchanged

(D) Zero

34. The unit of Dielectric Constant is: [BSEB 2023]

(A) $C^2 N^{-1} m^{-2}$

(B) $Nm^2 C^{-2}$

(C) Dimensionless

(D) None of these

Topic: Capacitors and Capacitance

35. Charge on a 10 µF capacitor charged to 5V will be: [BSEB Model]

(A) 50 C

(B) $50 \times 10^{-6}$ C

(C) $5 \times 10^{-6}$ C

(D) 2 C

36. Which of the following is the unit of Capacitance? [BSEB 2025]

(A) Coulomb

(B) Ampere

(C) Volt

(D) Coulomb/Volt

37. 64 identical drops (each 5 µF) combine to form a big drop. Capacitance will be: [BSEB]

(A) 4 µF

(B) 20 µF

(C) 25 µC

(D) 164 µF

38. Total charge on a charged capacitor is: [BSEB 2020]

(A) Zero

(B) $1 \mu C$

(C) $1 C$

(D) Infinite

39. Electrical capacitance of the Earth (radius R) is: [BSEB 2021]

(A) $R/4\pi\epsilon_0$

(B) $4\pi\epsilon_0 R$

(C) $4\pi\epsilon_0/R$

(D) $4\pi\epsilon_0 R^2$

40. What does a Van de Graaff generator produce? [BSEB 2023]

(A) Alternating current

(B) High frequency current

(C) High voltage

(D) Low voltage

41. The formula for capacitance of a parallel plate capacitor is: [BSEB 2021]

(A) $\epsilon_0 A/d$

(B) $\epsilon_0 d/A$

(C) $d/\epsilon_0 A$

(D) $A/\epsilon_0 d$

42. If energy is 1 J when charged to 100V, capacitance will be: [BSEB 2019]

(A) $2 \times 10^4$ F

(B) $2 \times 10^{-4}$ F

(C) $2 \times 10^2$ F

(D) $2 \times 10^{-2}$ F

43. To obtain 5 µF, how many 2 µF capacitors are needed? [BSEB 2018]

(A) 4

(B) 3

(C) 5

(D) 6

44. Capacitance of a capacitor does not depend on: [BSEB 2024]

(A) Shape of plates

(B) Size of plates

(C) Charge on plates

(D) Distance between plates

45. What remains the same in parallel combination of capacitors? [BSEB 2025]

(A) Charge

(B) Energy

(C) Potential difference

(D) Capacitance

46. Potential energy of a charged conductor is: [BSEB 2021]

(A) $CV^2$

(B) $\frac{1}{2} CV^2$

(C) $\frac{1}{3} CV^2$

(D) $\frac{1}{4} CV^2$

47. One Farad (1 F) is equal to: [BSEB 2021]

(A) 1 CV

(B) $1 CV^{-1}$

(C) $1 CV^{-2}$

(D) $1 C^2V$

48. Three capacitors (each C) are connected in series. Equivalent capacitance is: [BSEB 2017]

(A) 3C

(B) 3/C

(C) C/3

(D) 1/3C

49. Capacitance of a spherical conductor is 1 µF. Its radius will be: [BSEB 2024]

(A) 1.11 m

(B) 10 m

(C) 9 km

(D) 1.11 cm

50. Pico-farad (pF) is a unit of: [BSEB 2024]

(A) Charge

(B) Potential

(C) Capacitance

(D) Flux

51. Correct formula for capacitance of a spherical capacitor is: [BSEB 2022]

(A) $C = 4 \pi \epsilon_0 \left( \frac{R r}{R – r} \right)$

(B) $C = 4 \pi \epsilon_0 \left( \frac{r R}{r + R} \right)$

(C) $C = 4 \pi \epsilon_0 r^2/(R – r)$

(D) $C = 4 \pi \epsilon_0 r R^2/(R – r)$

52. If $n$ capacitors of capacitance $C_1$ are in parallel, then: [BSEB 2022]

(A) $C = n/C_1$

(B) $C = C_1/n$

(C) $C = n C_1$

(D) $C = n^2 C_1$

53. Energy of a 100 µF capacitor charged to 100V is: [BSEB 2025]

(A) 0.5 Joule

(B) 5 Joules

(C) 50 Joules

(D) 100 Joules

54. Capacitance of a spherical conductor in air is proportional to: [BSEB 2014]

(A) Mass

(B) Radius

(C) Volume

(D) Density

55. What is lost during redistribution of charge? [BSEB 2024]

(A) Charge

(B) Energy

(C) Momentum

(D) Mass

56. Which ratio is constant for an isolated conductor? [BSEB 2024]

(A) Total charge/Potential

(B) Potential/Charge

(C) Charge/(Potential)$^2$

(D) None of these

57. When two charged conductors are connected, what is conserved? [BSEB 2015]

(A) Energy

(B) Charge

(C) Both

(D) None

58. Capacitance of a capacitor after placing a glass slab between plates: [BSEB 2025]

(A) Increases

(B) Decreases

(C) Remains constant

(D) Becomes zero

59. 2 µF and 4 µF in series are connected to 1200V. Potential across 2 µF is: [BSEB 2022]

(A) 400 V

(B) 600 V

(C) 800 V

(D) 900 V

60. Dimensions of electrical capacitance are: [BSEB 2021]

(A) $[M^{-1}L^{-2}T^4A^2]$

(B) $[M^1L^2T^{-4}A^{-2}]$

(C) $[ML^2T^3A^1]$

(D) $[M^{-1}L^{-2}T^3A^1]$

61. 8 drops of mercury combine to form a big drop. Capacitance will be: [BSEB]

(A) 2 times

(B) 4 times

(C) 8 times

(D) 16 times

62. Potential of a new drop formed by 125 drops (each 50V) is: [BSEB 2016]

(A) 50 V

(B) 250 V

(C) 500 V

(D) 1250 V

63. Three capacitors give 6 µF in series. In parallel they will give: [BSEB 2021]

(A) 18 µF

(B) 2 µF

(C) 54 µF

(D) 3 µF

64. Energy is U for charge q. For charge 2q, energy will be: [BSEB 2015]

(A) 2U

(B) U/2

(C) 4U

(D) U/4

65. Correct expression for Energy Density is: [BSEB 2021]

(A) $\frac{1}{2} \epsilon_0 E^2$

(B) $\frac{1}{2} \epsilon_0^2 E$

(C) $\frac{1}{2} \epsilon_0^2 E^2$

(D) $\frac{1}{2} \epsilon_0 E$

66. What does a Capacitor block? [BSEB 2022]

(A) AC

(B) DC

(C) Both

(D) Neither

67. Two 1 µF in parallel, then 0.5 µF in series. Equivalent capacitance: [BSEB 2018]

(A) 1.6 µF

(B) 1.2 µF

(C) 1.0 µF

(D) 0.4 µF

68. Energy required to charge 5 µF to 20 kV is: [BSEB Model]

(A) 1 kJ

(B) 10 kJ

(C) 100 kJ

(D) 5 kJ

69. Stored energy in 100 µF charged to 10V is: [BSEB 2019]

(A) $5 \times 10^{-3} J$

(B) $0.5 \times 10^{-3} J$

(C) 0.5 J

(D) 5 J

70. Placing mica between plates of a capacitor causes capacitance to: [BSEB 2018]

(A) Increase

(B) Decrease

(C) Remain unchanged

(D) Zero

71. Halving the area of plates causes capacitance to become: [BSEB 2026]

(A) Double

(B) Half

(C) Same

(D) Four times

72. Charge on 1 µF at 1V potential difference will be: [BSEB 2026]

(A) 1 C

(B) Zero

(C) $1 \mu C$

(D) None of these

Unit 2: Current Electricity

73. Ohm’s Law does not apply when: [BSEB 2026]

(A) Temperature changes

(B) Temperature is constant

(C) Potential difference changes

(D) None of these

74. External resistance is R, internal is r. Current is maximum if: [BSEB 2026]

(A) R = r/2

(B) R = r

(C) R > r

(D) R < r

75. Current flows in a metallic conductor via: [BSEB 2026]

(A) Free electrons

(B) Protons

(C) Neutrons

(D) Bound electrons

76. In parallel combination, equivalent resistance: [BSEB 2026]

(A) Decreases

(B) Increases

(C) Remains the same

(D) None of these

77. Resistance of a wire is not affected by: [BSEB 2026]

(A) Length

(B) Temperature

(C) Material

(D) Applied potential

78. Relation between current density (J) and electric field (E) is: [BSEB 2026]

(A) E = σJ

(B) J = σE

(C) J = E/σ

(D) None of these

79. Value of Yellow color code for carbon resistor is: [BSEB 2026]

(A) 4

(B) 2

(C) 3

(D) 5

80. Absorbed electrical energy is: [BSEB 2026]

(A) Proportional to V

(B) Proportional to 1/V

(C) Proportional to V²

(D) None of these

81. Resistance of an ideal ammeter is: [BSEB 2026]

(A) Zero

(B) Infinite

(C) High

(D) Negative

82. Unit of Resistivity is: [BSEB 2021]

(A) Ohm-meter

(B) Ohm/meter

(C) Ohm-meter²

(D) Ohm/meter²

83. 1 kiloWatt-hour (1 kWh) is equal to: [BSEB 2022]

(A) $3.6 \times 10^6$ J

(B) $3.6 \times 10^3$ J

(C) $10^3$ J

(D) $10^5$ J

84. Electrical resistance of a healthy human body is: [BSEB 2021]

(A) 50,000 Ω

(B) 10,000 Ω

(C) 1,000 Ω

(D) 10 Ω

85. Formula for electric power (P) is: [BSEB 2021]

(A) V.I

(B) V²/R

(C) I².R

(D) All of the above

86. Unit of Faraday constant is: [BSEB 2022]

(A) Coulomb/mole

(B) Ampere/mole

(C) Coulomb/kg

(D) Coulomb/second

87. If 10A flows for 10s and potential is 15V, work is: [BSEB 2023]

(A) 150 J

(B) 75 J

(C) 1500 J

(D) 750 J

88. Wheatstone Bridge measures: [BSEB 2023]

(A) High resistance

(B) Low resistance

(C) Both high and low resistance

(D) Potential difference

89. Resistance of an ideal voltmeter is: [BSEB 2021]

(A) Low

(B) High

(C) Zero

(D) Infinite

90. Kirchhoff’s First Law (Junction rule) is based on: [BSEB 2021]

(A) Conservation of energy

(B) Conservation of charge

(C) Conservation of momentum

(D) Conservation of mass

91. Property of circuit that converts electrical energy to heat: [BSEB 2023]

(A) Current

(B) Potential

(C) Resistance

(D) EMF

92. Ampere-hour (Ah) is a unit of: [BSEB 2021]

(A) Power

(B) Charge

(C) Energy

(D) Potential

93. Dimensions of Electromotive Force (EMF) are: [BSEB 2022]

(A) $[ML^2T^{-2}]$

(B) $[ML^2T^{-3}A^{-1}]$

(C) $[MLT^{-2}]$

(D) $[ML^2T^{-3}]$

94. Red color code value for carbon resistor is: [BSEB 2021]

(A) 0

(B) 1

(C) 2

(D) 3

95. Between 25W and 100W bulbs, which has higher resistance? [BSEB 2019]

(A) 25W

(B) 100W

(C) Both same

(D) None of these

96. Relation between drift velocity (vd) and field (E) is: [BSEB 2021]

(A) vd ∝ E

(B) vd ∝ E²

(C) vd ∝ √E

(D) vd = Constant

97. What does a Volt-meter measure? [BSEB 2020]

(A) Resistance

(B) Potential difference

(C) Current

(D) Charge

98. Number of electrons per second in 1 µA current is: [BSEB 2023]

(A) $0.625 \times 10^{13}$

(B) $6.25 \times 10^{13}$

(C) $0.625 \times 10^{19}$

(D) $6.25 \times 10^{19}$

99. SI unit of Mobility is: [BSEB 2022]

(A) Am/N

(B) m²/Vs

(C) N/Am

(D) None of these

100. Which quantity remains the same in series combination? [BSEB 2024]

(A) Potential difference

(B) Current

(C) Resistance

(D) Power

101. Green color code value for carbon resistor is: [BSEB 2021]

(A) 3

(B) 4

(C) 5

(D) 6

102. Fuse wire is made of which material? [BSEB 2022]

(A) Copper

(B) Tungsten

(C) Lead-Tin alloy

(D) Nichrome

103. What is mainly measured by a Potentiometer? [BSEB 2024]

(A) Current

(B) Resistance

(C) Potential difference/EMF

(D) All of the above

104. Formula for electron mobility (µ) is: [BSEB 2021]

(A) µ = vd/E

(B) µ = E/vd

(C) µ = vd.E

(D) µ = E²/vd

105. A hot wire ammeter measures: [BSEB 2023]

(A) Peak current

(B) Average current

(C) Root-mean-square (RMS) current

(D) None of these

Mixed Practice (Electrostatics & Current)

106. What does quantization of charge show? [BSEB 2023]

(A) Fractional charge is not possible

(B) Charge cannot be destroyed

(C) Charge value is zero

(D) There is a minimum charge

107. Ratio of momenta of electron and proton at 100V is: [BSEB Model]

(A) 1

(B) $\sqrt{2m_e/m_p}$

(C) $\sqrt{m_e/m_p}$

(D) $\sqrt{m_e/2m_p}$

108. Expression for final velocity (v) of electron is: [BSEB 2012]

(A) $\sqrt{2eV/m}$

(B) $\sqrt{eV/m}$

(C) $eV/2m$

(D) $eV/m$

109. Increasing length of potentiometer wire causes sensitivity to: [BSEB 2021]

(A) Decrease

(B) Increase

(C) Remain constant

(D) Zero

110. SI unit of electric capacitance is: [BSEB 2025]

(A) Volt

(B) Newton

(C) Farad

(D) Ampere

111. Dielectric strength for air is: [BSEB 2021]

(A) $3 \times 10^6$ V/m

(B) $4 \times 10^6$ V/m

(C) $5 \times 10^6$ V/m

(D) $10^6$ V/m

112. Charge on 10 µF connected to 5V will be: [BSEB Model]

(A) 50 C

(B) $50 \times 10^{-6}$ C

(C) $5 \times 10^{-6}$ C

(D) 2 C

113. 64 drops combine to form a big drop. What is the capacitance? [BSEB 2018]

(A) 4 µF

(B) 20 µF

(C) 25 µC

(D) 164 µF

114. Dimensions of potential gradient are same as: [BSEB 2020]

(A) Electric field

(B) Potential

(C) Capacitance

(D) Energy

115. Capacitance of a capacitor does not depend on: [BSEB 2024]

(A) Shape

(B) Size

(C) Charge on plates

(D) Gap

116. Which of these is produced by a Van de Graaff generator? [BSEB 2023]

(A) AC

(B) DC

(C) High voltage

(D) Low voltage

117. Capacitance of Earth (for radius R) is: [BSEB 2021]

(A) $R/4\pi\epsilon_0$

(B) $4\pi\epsilon_0 R$

(C) $4\pi\epsilon_0/R$

(D) $4\pi\epsilon_0 R^2$

118. One volt (1 V) is equal to: [BSEB 2020]

(A) 1 J

(B) 1 J/C

(C) 1 C/J

(D) 1 JC

119. Electron-volt (eV) is a measure of: [BSEB 2020]

(A) Charge

(B) Potential

(C) Current

(D) Energy

120. What remains same for capacitors in parallel? [BSEB 2025]

(A) Charge

(B) Energy

(C) Potential

(D) Capacitance

121. Formula for energy of a charged conductor is: [BSEB 2021]

(A) $CV^2$

(B) $\frac{1}{2} CV^2$

(C) $C^2V$

(D) $V^2/C$

122. Radius of a spherical conductor (1 µF) will be: [BSEB 2024]

(A) 1.11 m

(B) 10 m

(C) 9 km

(D) 1.11 cm

123. Potential V for a point charge at distance r: [BSEB 2018]

(A) V ∝ r

(B) V ∝ 1/r

(C) V ∝ r²

(D) V ∝ 1/r²

124. Resistance of an ideal ammeter is: [BSEB 2026]

(A) Zero

(B) Infinite

(C) High

(D) Low

125. Resistance of an ideal voltmeter is: [BSEB 2021]

(A) Zero

(B) Infinite

(C) High

(D) Low

126. Kirchhoff’s First Law is based on: [BSEB 2021]

(A) Energy

(B) Charge

(C) Momentum

(D) Mass

127. Kirchhoff’s Second Law is based on: [BSEB 2022]

(A) Energy conservation

(B) Charge conservation

(C) Momentum conservation

(D) Mass conservation

128. Value of 1 kWh in Joules is: [BSEB 2022]

(A) $3.6 \times 10^6$

(B) $3.6 \times 10^5$

(C) $3.6 \times 10^4$

(D) $10^6$

129. Value of ‘Black’ color in carbon code is: [BSEB 2021]

(A) 0

(B) 1

(C) 2

(D) 5

130. Value of ‘Brown’ color in carbon code is: [BSEB 2021]

(A) 0

(B) 1

(C) 2

(D) 5

131. Resistance after doubling the length of a wire by stretching: [BSEB 2019]

(A) 2R

(B) 4R

(C) R/2

(D) R/4

132. SI unit of Resistivity is: [BSEB 2021]

(A) Ohm-meter

(B) Ohm/meter

(C) Volt-meter

(D) Ampere-meter

133. Resistance of semiconductors with increase in temperature: [BSEB 2022]

(A) Increases

(B) Decreases

(C) Remains constant

(D) Becomes zero

134. Resistance of conductors with increase in temperature: [BSEB 2021]

(A) Increases

(B) Decreases

(C) Remains constant

(D) Becomes zero

135. What is the unit of electric power? [BSEB 2021]

(A) Watt

(B) Volt

(C) Ampere

(D) Ohm

136. Main function of a capacitor is: [BSEB Model]

(A) Stop current

(B) Increase potential

(C) Energy storage

(D) Reduce temperature

137. Shape of a soap bubble when charged: [BSEB 2021]

(A) Increases

(B) Decreases

(C) Remains constant

(D) None of these

138. Potential V in a region where intensity E = 0: [BSEB 2026]

(A) Zero

(B) Constant

(C) Infinite

(D) Variable

139. Capacitance after adding dielectric medium: [BSEB 2025]

(A) Increases

(B) Decreases

(C) Remains constant

(D) Becomes zero

140. Dielectric constant (k) of metals is: [BSEB 2019]

(A) 0

(B) 1

(C) Infinite

(D) -1

141. SI unit of electric dipole moment (p) is: [BSEB 2021]

(A) C-m

(B) C/m

(C) C-m²

(D) None of these

142. Value of charge on an electron is: [BSEB 2023]

(A) $1.6 \times 10^{-19}$ C

(B) $1.6 \times 10^{-18}$ C

(C) $1.6 \times 10^{-20}$ C

(D) None of these

143. One Farad (F) is equal to: [BSEB 2021]

(A) 1 C/V

(B) 1 V/C

(C) 1 C-V

(D) None of these

144. kiloWatt-hour (kWh) is a unit of: [BSEB 2020]

(A) Power

(B) Energy

(C) Force

(D) Potential

145. Ampere-second (As) is a unit of: [BSEB 2021]

(A) Charge

(B) Current

(C) Potential

(D) Energy

146. Dimensions of electric capacitance are: [BSEB 2021]

(A) $[M^{-1}L^{-2}T^4A^2]$

(B) $[ML^2T^{-3}A^{-1}]$

(C) $[ML^2T^{-2}]$

(D) None of these

147. Wheatstone Bridge is used to measure: [BSEB 2023]

(A) Only high resistance

(B) Only low resistance

(C) Both high and low resistance

(D) None of these

148. To increase sensitivity of a potentiometer: [BSEB 2021]

(A) Wire length should be increased

(B) Current should be increased

(C) Length should be decreased

(D) None of these

149. EMF of a cell is measured by: [BSEB 2024]

(A) Voltmeter

(B) Ammeter

(C) Potentiometer

(D) Galvanometer

150. Value of permittivity of free space (ε₀) is: [BSEB 2021]

(A) $8.85 \times 10^{-12}$

(B) $9 \times 10^9$

(C) $1.6 \times 10^{-19}$

(D) 1