Chapter 12 – Electricity – MCQs
Chapter 12 – Electricity – MCQs (Part 1: Q1–Q25)
Q1. The SI unit of electric current is:
a) Volt
b) Ampere
c) Ohm
d) Coulomb
✅ Answer: b) Ampere
Explanation: Current is measured in amperes (A), which represents 1 coulomb of charge per second.
Q2. Electric potential difference is measured in:
a) Ampere
b) Volt
c) Ohm
d) Joule
✅ Answer: b) Volt
Explanation: Potential difference = Work done per unit charge, measured in volts.
Q3. Which instrument is used to measure electric current?
a) Ammeter
b) Voltmeter
c) Galvanometer
d) Multimeter
✅ Answer: a) Ammeter
Explanation: An ammeter is always connected in series to measure current.
Q4. The SI unit of resistance is:
a) Watt
b) Ohm
c) Volt
d) Coulomb
✅ Answer: b) Ohm
Explanation: Resistance (R) is measured in ohms (Ω), where 1 Ω = 1 V/A.
Q5. Ohm’s law states that:
a) V = IR
b) V = I/R
c) V = R/I
d) V = I²R
✅ Answer: a) V = IR
Explanation: According to Ohm’s law, voltage across a conductor is proportional to current at constant resistance.
Q6. In a circuit, the current is directly proportional to:
a) Voltage
b) Resistance
c) Power
d) Energy
✅ Answer: a) Voltage
Explanation: From Ohm’s law: I = V/R.
Q7. In a circuit, the current is inversely proportional to:
a) Voltage
b) Resistance
c) Power
d) Energy
✅ Answer: b) Resistance
Explanation: Higher resistance reduces the flow of current.
Q8. The SI unit of electrical power is:
a) Joule
b) Watt
c) Ohm
d) Volt
✅ Answer: b) Watt
Explanation: Power = Work done/time = VI.
Q9. The commercial unit of electrical energy is:
a) Joule
b) Watt-hour
c) Kilowatt-hour
d) Ampere-hour
✅ Answer: c) Kilowatt-hour
Explanation: 1 kWh = 1000 watt × 1 hour = 3.6 × 10⁶ joules.
Q10. The SI unit of electric charge is:
a) Ampere
b) Coulomb
c) Volt
d) Joule
✅ Answer: b) Coulomb
Explanation: 1 Coulomb = charge transferred by 1 ampere current in 1 second.
Q11. A device used to measure potential difference is:
a) Ammeter
b) Voltmeter
c) Galvanometer
d) Rheostat
✅ Answer: b) Voltmeter
Explanation: Voltmeter is connected in parallel across the circuit.
Q12. Which of the following materials is a good conductor of electricity?
a) Rubber
b) Copper
c) Wood
d) Plastic
✅ Answer: b) Copper
Explanation: Copper has low resistance and is widely used in electrical wiring.
Q13. Which of the following materials is an insulator?
a) Copper
b) Silver
c) Aluminium
d) Rubber
✅ Answer: d) Rubber
Explanation: Rubber resists the flow of current and is used in insulation.
Q14. The resistance of a conductor depends on:
a) Length
b) Area of cross-section
c) Material of conductor
d) All of these
✅ Answer: d) All of these
Explanation: Resistance R = ρ (L/A), depends on length, area, and resistivity of material.
Q15. Resistivity depends on:
a) Length of conductor
b) Cross-sectional area
c) Material and temperature
d) Both a and b
✅ Answer: c) Material and temperature
Explanation: Resistivity is a property of material and varies with temperature.
Q16. The SI unit of resistivity is:
a) Ohm
b) Ohm-metre
c) Ohm/cm
d) Ohm/m²
✅ Answer: b) Ohm-metre
Explanation: Resistivity (ρ) is measured in ohm-metre (Ωm).
Q17. Which type of combination gives same current through all resistors?
a) Series
b) Parallel
c) Both series and parallel
d) None
✅ Answer: a) Series
Explanation: In series, the same current passes through all resistors.
Q18. In which combination of resistors is voltage the same across all resistors?
a) Series
b) Parallel
c) Both
d) None
✅ Answer: b) Parallel
Explanation: In parallel, voltage remains the same across all branches.
Q19. The equivalent resistance of two resistors R₁ and R₂ in series is:
a) R₁ + R₂
b) R₁R₂/(R₁+R₂)
c) 1/R₁ + 1/R₂
d) None
✅ Answer: a) R₁ + R₂
Explanation: Series resistances add directly.
Q20. The equivalent resistance of two resistors R₁ and R₂ in parallel is:
a) R₁ + R₂
b) R₁R₂/(R₁+R₂)
c) R₁ – R₂
d) None
✅ Answer: b) R₁R₂/(R₁+R₂)
Explanation: Formula: 1/R = 1/R₁ + 1/R₂.
Q21. If 3 resistors of 6 Ω each are connected in series, the equivalent resistance is:
a) 2 Ω
b) 6 Ω
c) 12 Ω
d) 18 Ω
✅ Answer: d) 18 Ω
Explanation: R = R₁ + R₂ + R₃ = 6 + 6 + 6 = 18 Ω.
Q22. If 3 resistors of 6 Ω each are connected in parallel, the equivalent resistance is:
a) 2 Ω
b) 6 Ω
c) 12 Ω
d) 18 Ω
✅ Answer: a) 2 Ω
Explanation: 1/R = 1/6 + 1/6 + 1/6 = 3/6 → R = 2 Ω.
Q23. The SI unit of electric power is equivalent to:
a) Joule/second
b) Ampere/second
c) Volt/second
d) Coulomb/second
✅ Answer: a) Joule/second
Explanation: 1 Watt = 1 Joule per second.
Q24. Which of the following is the correct formula for electric energy?
a) E = VI × t
b) E = V/I
c) E = IR
d) E = V²/R
✅ Answer: a) E = VI × t
Explanation: Energy = Power × Time = V × I × t.
Q25. Which of the following relations is correct?
a) P = VI
b) P = I²R
c) P = V²/R
d) All of these
✅ Answer: d) All of these
Explanation: All are valid power formulas derived from Ohm’s law.
Electricity – MCQs (Part 2: Q26–Q50)
Q26. Which law governs the relationship between current, voltage, and resistance?
a) Joule’s law
b) Coulomb’s law
c) Ohm’s law
d) Newton’s law
✅ Answer: c) Ohm’s law
Explanation: Ohm’s law states that V = IR at constant temperature.
Q27. A fuse in a circuit is always connected in:
a) Parallel
b) Series
c) Either series or parallel
d) Across the battery
✅ Answer: b) Series
Explanation: Fuse is in series so it can break the entire circuit when current exceeds safe limit.
Q28. The heating effect of current is directly proportional to:
a) Resistance only
b) Square of current
c) Voltage
d) Power
✅ Answer: b) Square of current
Explanation: Heat (H) = I²Rt, so heat depends on the square of current.
Q29. The device used to protect electrical appliances from overloading is:
a) Capacitor
b) Fuse
c) Generator
d) Motor
✅ Answer: b) Fuse
Explanation: A fuse melts when current exceeds safe value, protecting appliances.
Q30. Which one of the following is the SI unit of electric energy?
a) Kilowatt-hour
b) Joule
c) Ampere-hour
d) Watt
✅ Answer: b) Joule
Explanation: The SI unit is joule, though kWh is commonly used commercially.
Q31. Which of the following will have the highest resistance?
a) Short thick wire
b) Short thin wire
c) Long thin wire
d) Long thick wire
✅ Answer: c) Long thin wire
Explanation: Resistance ∝ length/area, so a long thin wire has maximum resistance.
Q32. A voltmeter is always connected in:
a) Series
b) Parallel
c) Either series or parallel
d) In place of resistor
✅ Answer: b) Parallel
Explanation: Voltmeter measures potential difference, hence connected in parallel across the circuit.
Q33. Which of the following is the correct relation for resistivity (ρ)?
a) ρ = R × A / L
b) ρ = R × L / A
c) ρ = A / RL
d) ρ = V / IR
✅ Answer: b) ρ = R × L / A
Explanation: Resistivity depends on material, not dimensions.
Q34. When resistors are connected in parallel, their equivalent resistance is:
a) Greater than the largest resistance
b) Less than the smallest resistance
c) Equal to the sum of resistances
d) Equal to the difference
✅ Answer: b) Less than the smallest resistance
Explanation: In parallel, equivalent resistance is always smaller.
Q35. Electric current is the flow of:
a) Neutrons
b) Electrons
c) Protons
d) Atoms
✅ Answer: b) Electrons
Explanation: Current is due to flow of negatively charged electrons.
Q36. The resistance of a conductor is doubled when:
a) Length is doubled
b) Area is doubled
c) Length is halved
d) Area is increased
✅ Answer: a) Length is doubled
Explanation: Resistance ∝ length.
Q37. Which of the following does not affect the resistance of a conductor?
a) Length
b) Cross-sectional area
c) Temperature
d) Colour
✅ Answer: d) Colour
Explanation: Resistance depends only on physical dimensions and material properties.
Q38. Joule’s law of heating states that:
a) Heat ∝ I²Rt
b) Heat ∝ V²t/R
c) Heat ∝ VIt
d) All of these
✅ Answer: d) All of these
Explanation: All forms are valid using Ohm’s law.
Q39. The electrical energy consumed by an electric bulb depends on:
a) Power rating
b) Time of operation
c) Voltage supply
d) All of these
✅ Answer: d) All of these
Explanation: Energy consumed = Power × Time, and power depends on voltage and current.
Q40. Which of the following appliances uses the heating effect of current?
a) Electric bulb
b) Electric iron
c) Electric heater
d) All of these
✅ Answer: d) All of these
Explanation: All work on heating effect of current.
Q41. What is the resistance of a 100 W, 220 V bulb?
a) 220 Ω
b) 484 Ω
c) 440 Ω
d) 100 Ω
✅ Answer: b) 484 Ω
Explanation: R = V² / P = (220)² / 100 = 484 Ω.
Q42. What is the current through a 60 W, 220 V bulb?
a) 0.27 A
b) 0.5 A
c) 1 A
d) 2 A
✅ Answer: a) 0.27 A
Explanation: I = P/V = 60/220 ≈ 0.27 A.
Q43. Which of the following combinations is used for household wiring?
a) Series
b) Parallel
c) Both series and parallel
d) None
✅ Answer: b) Parallel
Explanation: Appliances in parallel get same voltage and work independently.
Q44. Electric power is defined as:
a) Work done per unit time
b) Energy × Time
c) Current × Resistance
d) Voltage × Resistance
✅ Answer: a) Work done per unit time
Explanation: Power = Work/Time = VI.
Q45. The SI unit of electric potential difference is equivalent to:
a) Joule/Coulomb
b) Watt/Second
c) Newton/Coulomb
d) Coulomb/Joule
✅ Answer: a) Joule/Coulomb
Explanation: Potential difference is work done per unit charge.
Q46. The total resistance of two resistors in parallel is:
a) Equal to the sum of resistances
b) Less than either of the resistances
c) Greater than both
d) None
✅ Answer: b) Less than either of the resistances
Explanation: Parallel connection reduces effective resistance.
Q47. A current of 1 A flows through a wire in 1 second. The charge passed is:
a) 1 C
b) 10 C
c) 100 C
d) 0.1 C
✅ Answer: a) 1 C
Explanation: Q = I × t = 1 × 1 = 1 C.
Q48. In Ohm’s law, resistance is constant if:
a) Temperature remains constant
b) Voltage changes
c) Current changes
d) Both b and c
✅ Answer: a) Temperature remains constant
Explanation: Ohm’s law is valid only at constant temperature.
Q49. Which of the following is NOT a good conductor?
a) Copper
b) Aluminium
c) Silver
d) Wood
✅ Answer: d) Wood
Explanation: Wood is an insulator.
Q50. Which of the following is the correct relation for electrical power?
a) P = VI
b) P = I²R
c) P = V²/R
d) All of these
✅ Answer: d) All of these
Explanation: All are equivalent power relations derived from Ohm’s law.
Electricity – MCQs (Part 3: Q51–Q75)
Q51. If the current through a resistor is doubled, the heat produced will become:
a) Half
b) Double
c) Four times
d) Remains same
✅ Answer: c) Four times
Explanation: Heat (H) = I²Rt. If current doubles, heat increases by 4 times.
Q52. Which of the following is NOT a unit of power?
a) Joule/second
b) Watt
c) Kilowatt
d) Joule
✅ Answer: d) Joule
Explanation: Joule is a unit of work/energy, not power.
Q53. A wire of resistance 10 Ω is stretched to double its length. Its new resistance will be:
a) 20 Ω
b) 40 Ω
c) 5 Ω
d) 2.5 Ω
✅ Answer: b) 40 Ω
Explanation: R ∝ L²/A. Doubling length → resistance becomes 4 times (10 × 4 = 40 Ω).
Q54. If a conductor’s cross-sectional area is doubled, its resistance will:
a) Become double
b) Become half
c) Remain unchanged
d) Become one-fourth
✅ Answer: b) Become half
Explanation: R ∝ 1/A. Doubling area halves resistance.
Q55. Which device converts electrical energy into mechanical energy?
a) Motor
b) Generator
c) Battery
d) Fuse
✅ Answer: a) Motor
Explanation: An electric motor works on the principle of current in a magnetic field.
Q56. Which device converts chemical energy into electrical energy?
a) Motor
b) Generator
c) Battery
d) Transformer
✅ Answer: c) Battery
Explanation: Batteries convert chemical reactions into electrical energy.
Q57. Which device converts electrical energy into heat energy?
a) Heater
b) Fuse
c) Motor
d) Generator
✅ Answer: a) Heater
Explanation: Heating effect of current is used in heaters.
Q58. The unit of electrical conductivity is:
a) Ohm-metre
b) Siemens/m
c) Ampere
d) Volt
✅ Answer: b) Siemens/m
Explanation: Conductivity is reciprocal of resistivity, measured in Siemens per metre.
Q59. The potential difference across a conductor is 12 V and current through it is 3 A. Its resistance is:
a) 2 Ω
b) 3 Ω
c) 4 Ω
d) 6 Ω
✅ Answer: c) 4 Ω
Explanation: R = V/I = 12/3 = 4 Ω.
Q60. The resistance of an ideal ammeter is:
a) Zero
b) Infinite
c) High
d) Very low
✅ Answer: a) Zero
Explanation: Ideally, an ammeter should have zero resistance so it doesn’t affect circuit current.
Q61. The resistance of an ideal voltmeter is:
a) Zero
b) Infinite
c) Very low
d) Depends on current
✅ Answer: b) Infinite
Explanation: Infinite resistance prevents current flow through voltmeter, ensuring accurate readings.
Q62. A 100 W bulb consumes 100 joules of energy in:
a) 1 second
b) 10 seconds
c) 100 seconds
d) 1 hour
✅ Answer: a) 1 second
Explanation: Power = Energy/Time → 100 W = 100 J/s.
Q63. A 2000 W appliance used for 2 hours consumes how much energy in kWh?
a) 2 kWh
b) 4 kWh
c) 2000 kWh
d) 40 kWh
✅ Answer: b) 4 kWh
Explanation: Energy = Power × Time = 2000 W × 2 h = 4000 Wh = 4 kWh.
Q64. Which of the following appliances works on the principle of heating effect of current?
a) Fan
b) Refrigerator
c) Electric geyser
d) Generator
✅ Answer: c) Electric geyser
Explanation: Geyser uses heating element to heat water.
Q65. A 220 V, 100 W bulb is used for 10 hours. The energy consumed is:
a) 0.1 kWh
b) 1 kWh
c) 10 kWh
d) 100 kWh
✅ Answer: b) 1 kWh
Explanation: Energy = Power × Time = 100 W × 10 h = 1000 Wh = 1 kWh.
Q66. The heating element of an electric iron is made of:
a) Copper
b) Aluminium
c) Nichrome
d) Tungsten
✅ Answer: c) Nichrome
Explanation: Nichrome has high resistivity and can withstand high temperatures.
Q67. The filament of an electric bulb is made of:
a) Copper
b) Tungsten
c) Silver
d) Nichrome
✅ Answer: b) Tungsten
Explanation: Tungsten has high melting point and glows without melting.
Q68. Which of the following materials is used for making fuse wire?
a) Copper
b) Aluminium
c) Silver
d) Tin-lead alloy
✅ Answer: d) Tin-lead alloy
Explanation: Fuse wire has low melting point, so it melts easily on overcurrent.
Q69. Electric current is measured as the rate of flow of:
a) Voltage
b) Power
c) Charge
d) Resistance
✅ Answer: c) Charge
Explanation: Current I = Q/t, where Q = charge.
Q70. What is the resistance of a 220 V, 1100 W electric kettle?
a) 22 Ω
b) 44 Ω
c) 55 Ω
d) 11 Ω
✅ Answer: a) 22 Ω
Explanation: R = V²/P = (220)² / 1100 = 22 Ω.
Q71. In a household circuit, the fuse is always connected to the:
a) Neutral wire
b) Earth wire
c) Live wire
d) Any wire
✅ Answer: c) Live wire
Explanation: Fuse cuts off supply by breaking live wire connection.
Q72. Which of the following has negative charge carriers?
a) Protons
b) Electrons
c) Neutrons
d) Positrons
✅ Answer: b) Electrons
Explanation: Electrons carry negative charge and flow to form current.
Q73. A 60 W bulb consumes 60 joules of energy in:
a) 1 hour
b) 1 minute
c) 1 second
d) 60 seconds
✅ Answer: c) 1 second
Explanation: Power = Energy/Time → 60 W = 60 J/s.
Q74. A fuse is rated at 5 A. Which appliance can be safely connected?
a) 220 V, 1000 W
b) 220 V, 500 W
c) 220 V, 1200 W
d) 220 V, 1500 W
✅ Answer: b) 220 V, 500 W
Explanation: Current = P/V = 500/220 ≈ 2.27 A (< 5 A). Others exceed 5 A.
Q75. The earth wire in an electric circuit is for:
a) Reducing current
b) Preventing shocks
c) Reducing resistance
d) Saving energy
✅ Answer: b) Preventing shocks
Explanation: Earth wire provides path for leakage current, preventing electric shocks.
Electricity – MCQs (Part 4: Q76–Q100)
Q76. The household supply in India is:
a) 110 V, DC
b) 220 V, DC
c) 220 V, AC
d) 110 V, AC
✅ Answer: c) 220 V, AC
Explanation: In India, households receive 220 V alternating current at 50 Hz.
Q77. The frequency of AC in India is:
a) 25 Hz
b) 50 Hz
c) 60 Hz
d) 100 Hz
✅ Answer: b) 50 Hz
Explanation: The alternating current in India changes direction 50 times per second.
Q78. A bulb is rated 60 W, 220 V. The current drawn is:
a) 0.27 A
b) 0.5 A
c) 1 A
d) 2 A
✅ Answer: a) 0.27 A
Explanation: I = P/V = 60/220 ≈ 0.27 A.
Q79. A 220 V, 100 W bulb is used for 10 hours. The energy consumed is:
a) 1 kWh
b) 10 kWh
c) 0.1 kWh
d) 100 kWh
✅ Answer: a) 1 kWh
Explanation: E = P × t = 100 × 10 h = 1000 Wh = 1 kWh.
Q80. The filament of an electric bulb is made of tungsten because:
a) Low resistivity
b) High melting point
c) Cheap
d) Shiny
✅ Answer: b) High melting point
Explanation: Tungsten can glow at high temperature without melting.
Q81. An electric iron of 1000 W is used for 1 hour. Energy consumed is:
a) 1 J
b) 1000 J
c) 1 kWh
d) 1000 kWh
✅ Answer: c) 1 kWh
Explanation: Energy = P × t = 1000 W × 1 h = 1 kWh.
Q82. The resistance of a wire is proportional to:
a) L²
b) L
c) 1/L
d) None
✅ Answer: b) L
Explanation: Resistance ∝ Length of conductor.
Q83. The resistance of a wire is inversely proportional to:
a) Area of cross-section
b) Resistivity
c) Length
d) Temperature
✅ Answer: a) Area of cross-section
Explanation: Resistance decreases with larger cross-sectional area.
Q84. Which material has the lowest resistivity?
a) Silver
b) Copper
c) Aluminium
d) Iron
✅ Answer: a) Silver
Explanation: Silver is the best conductor, having lowest resistivity.
Q85. Electric energy is equal to:
a) VI
b) VIt
c) IRt
d) V/R
✅ Answer: b) VIt
Explanation: Energy = Power × Time = VI × t.
Q86. The power consumed in a circuit is maximum when:
a) Resistance is very high
b) Resistance is very low
c) Resistance equals source resistance
d) None
✅ Answer: c) Resistance equals source resistance
Explanation: This is the condition for maximum power transfer.
Q87. A 60 W, 220 V bulb and a 100 W, 220 V bulb are connected in parallel. Which glows brighter?
a) 60 W
b) 100 W
c) Both same
d) None
✅ Answer: b) 100 W
Explanation: In parallel, both receive 220 V, but 100 W consumes more power.
Q88. A 60 W, 220 V bulb and a 100 W, 220 V bulb are connected in series. Which glows brighter?
a) 60 W
b) 100 W
c) Both same
d) None
✅ Answer: a) 60 W
Explanation: In series, current is same. The bulb with higher resistance (60 W) dissipates more power.
Q89. In an electric circuit, if the voltage is doubled and resistance is halved, current becomes:
a) Same
b) Double
c) Four times
d) Half
✅ Answer: c) Four times
Explanation: I = V/R. Doubling V and halving R → I increases 4 times.
Q90. The resistance of an ideal conductor at 0 K is:
a) Zero
b) Infinite
c) Very high
d) Cannot be determined
✅ Answer: a) Zero
Explanation: At absolute zero, ideal conductors behave like superconductors.
Q91. In household wiring, why are appliances connected in parallel?
a) To reduce power
b) To save energy
c) To get equal voltage and independent working
d) To increase resistance
✅ Answer: c) To get equal voltage and independent working
Explanation: In parallel, appliances receive full voltage and work independently.
Q92. Which law explains the heating effect of current?
a) Ohm’s law
b) Joule’s law
c) Coulomb’s law
d) Kirchhoff’s law
✅ Answer: b) Joule’s law
Explanation: Joule’s law: H = I²Rt.
Q93. The safety fuse wire should have:
a) High melting point and high resistance
b) Low melting point and low resistance
c) Low melting point and high resistance
d) High melting point and low resistance
✅ Answer: c) Low melting point and high resistance
Explanation: Fuse should melt easily to break the circuit during overload.
Q94. Which of the following is NOT a property of an ideal fuse wire?
a) High resistivity
b) Low melting point
c) High current carrying capacity
d) Easily replaceable
✅ Answer: c) High current carrying capacity
Explanation: Fuse should carry limited current only, not high current.
Q95. When electric current passes through a metallic conductor, most of the energy is lost as:
a) Sound
b) Heat
c) Radiation
d) Magnetism
✅ Answer: b) Heat
Explanation: Due to resistance, electrical energy is converted into heat.
Q96. The heating element of a geyser should have:
a) High resistivity, high melting point
b) Low resistivity, low melting point
c) High conductivity, high melting point
d) Low conductivity, low melting point
✅ Answer: a) High resistivity, high melting point
Explanation: High resistivity produces heat, high melting point prevents breakage.
Q97. Which of the following appliances works on the principle of Joule heating?
a) Electric iron
b) Electric oven
c) Electric heater
d) All of these
✅ Answer: d) All of these
Explanation: All these appliances use heating effect of current.
Q98. The potential difference across a resistor is doubled. The power dissipated will:
a) Double
b) Half
c) Four times
d) Remains same
✅ Answer: c) Four times
Explanation: P = V²/R. Doubling V increases P four times.
Q99. Which of the following is a correct statement about electric current?
a) Current is the flow of protons
b) Current flows from low potential to high potential
c) Conventional current is opposite to electron flow
d) Current is measured in volts
✅ Answer: c) Conventional current is opposite to electron flow
Explanation: Electrons flow negative → positive, conventional current flows positive → negative.
Q100. The SI unit of electric power is:
a) Joule
b) Ampere
c) Watt
d) Volt
✅ Answer: c) Watt
Explanation: Power = Work/Time = VI, measured in watts.
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❓ FAQ Section:
Q1. Why are Electricity Class 10 MCQs important for CBSE Science Board Exams?
Ans: Electricity MCQs help students revise Ohm’s Law, resistances, power, energy, and circuit analysis, which are frequently tested in exams.
Q2. How many marks can the Electricity chapter carry in Class 10 Board Exams?
Ans: The “Electricity” chapter typically carries 8–10 marks in the CBSE Class 10 Science Board Exams, including MCQs and numericals.
Q3. What are the most important topics in Class 10 Electricity for MCQs?
Ans: Key topics include Ohm’s Law, resistors in series and parallel, heating effect of current, electric power, and energy consumption.
Q4. How can I prepare Electricity MCQs effectively for exams?
Ans: Revise NCERT thoroughly, solve practice MCQs with explanations, attempt previous years’ CBSE papers, and focus on numerical-based questions.
Q5. Which formulas should I memorize for Class 10 Electricity?
Ans: Important formulas include V = IR, P = VI, P = I²R, P = V²/R, H = I²Rt, R = ρL/A, and energy = P × t.
