Electricity MCQ
Q1. What is electric current ? (āĻŦāĻŋāĻĻā§āĻ¯ā§ā§ āĻ§āĻžā§°āĻž āĻāĻŋ ?)
Options: (a) Flow of mass (āĻā§°ā§° āĻĒā§ā§°āĻŦāĻžāĻš) (b) Flow of charge (āĻā§ąā§āĻļā§° āĻĒā§ā§°āĻŦāĻžāĻš) (c) Flow of heat (āĻ¤āĻžāĻĒā§° āĻĒā§ā§°āĻŦāĻžāĻš) (d) Flow of light (āĻĒā§āĻšā§°ā§° āĻĒā§ā§°āĻŦāĻžāĻš)
Ans: (b) Flow of charge (āĻā§ąā§āĻļā§° āĻĒā§ā§°āĻŦāĻžāĻš)
Explanation: Electric current is the flow of charges. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻŦāĻŋāĻĻā§āĻ¯ā§ā§ āĻ§āĻžā§°āĻž āĻŽāĻžāĻ¨ā§ āĻā§ąā§āĻļā§° āĻĒā§ā§°āĻŦāĻžāĻšāĨ¤
Q2. What is the SI unit of current ? (āĻŦāĻŋāĻĻā§āĻ¯ā§ā§ āĻ§āĻžā§°āĻžā§° āĻāĻāĻ āĻāĻŋ ?)
Options: (a) Volt (āĻā§āĻ˛ā§āĻ) (b) Ohm (āĻāĻŽ) (c) Ampere (āĻāĻŽā§āĻĒāĻŋāĻ¯āĻŧāĻžā§°) (d) Watt (ā§ąāĻžāĻ)
Ans: (c) Ampere (āĻāĻŽā§āĻĒāĻŋāĻ¯āĻŧāĻžā§°)
Explanation: Ampere is the unit of current. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻāĻŽā§āĻĒāĻŋāĻ¯āĻŧāĻžā§° āĻšā§āĻā§ āĻŦāĻŋāĻĻā§āĻ¯ā§ā§ āĻ§āĻžā§°āĻžā§° āĻāĻāĻāĨ¤
Q3. What is potential difference ? (āĻā§āĻ˛ā§āĻā§āĻ āĻāĻŋ ?)
Options: (a) Energy (āĻļāĻā§āĻ¤āĻŋ) (b) Work per unit charge (āĻāĻāĻ āĻā§ąā§āĻļ āĻĒā§ā§°āĻ¤āĻŋ āĻāĻžāĻŽ) (c) Current (āĻ§āĻžā§°āĻž) (d) Resistance (āĻĒā§ā§°āĻ¤āĻŋā§°ā§āĻ§)
Ans: (b) Work per unit charge (āĻāĻāĻ āĻā§ąā§āĻļ āĻĒā§ā§°āĻ¤āĻŋ āĻāĻžāĻŽ)
Explanation: It is the work done to move a unit charge. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻāĻāĻ āĻā§ąā§āĻļ āĻ¸ā§āĻĨāĻžāĻ¨āĻžāĻ¨ā§āĻ¤ā§° āĻā§°āĻŋāĻŦāĻ˛ā§ āĻā§°āĻž āĻāĻžāĻŽāĨ¤
Q4. What is the unit of voltage ? (āĻā§āĻ˛ā§āĻā§āĻā§° āĻāĻāĻ āĻāĻŋ ?)
Options: (a) Ampere (āĻāĻŽā§āĻĒāĻŋāĻ¯āĻŧāĻžā§°) (b) Watt (ā§ąāĻžāĻ) (c) Volt (āĻā§āĻ˛ā§āĻ) (d) Ohm (āĻāĻŽ)
Ans: (c) Volt (āĻā§āĻ˛ā§āĻ)
Explanation: Voltage is measured in volts. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻā§āĻ˛ā§āĻā§āĻ āĻā§āĻ˛ā§āĻāĻ¤ āĻŽāĻžāĻĒ āĻā§°āĻž āĻšāĻ¯āĻŧāĨ¤
Q5. Ohm’s Law is: (āĻāĻŽā§° āĻ¸ā§āĻ¤ā§āĻ° āĻāĻŋ ?)
Options: (a) V = I/R (b) V = IR (c) I = VR (d) R = VI
Ans: (b) V = IR
Explanation: Voltage = Current × Resistance. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻā§āĻ˛ā§āĻā§āĻ = āĻ§āĻžā§°āĻž × āĻĒā§ā§°āĻ¤āĻŋā§°ā§āĻ§āĨ¤
Q6. What is resistance ? (āĻĒā§ā§°āĻ¤āĻŋā§°ā§āĻ§ āĻāĻŋ ?)
Options: (a) Flow of current (āĻ§āĻžā§°āĻžā§° āĻĒā§ā§°āĻŦāĻžāĻš) (b) Production of heat (āĻ¤āĻžāĻĒ āĻā§āĻĒāĻžāĻĻāĻ¨) (c) Opposition to current (āĻ§āĻžā§°āĻžā§° āĻŦāĻžāĻ§āĻž) (d) Energy (āĻļāĻā§āĻ¤āĻŋ)
Ans: (c) Opposition to current (āĻ§āĻžā§°āĻžā§° āĻŦāĻžāĻ§āĻž)
Explanation: Resistance opposes current flow. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻĒā§ā§°āĻ¤āĻŋā§°ā§āĻ§ā§ āĻ§āĻžā§°āĻžā§° āĻĒā§ā§°āĻŦāĻžāĻšāĻ¤ āĻŦāĻžāĻ§āĻž āĻĻāĻŋāĻ¯āĻŧā§āĨ¤
Q7. Unit of resistance is: (āĻĒā§ā§°āĻ¤āĻŋā§°ā§āĻ§ā§° āĻāĻāĻ āĻāĻŋ ?)
Options: (a) Volt (āĻā§āĻ˛ā§āĻ) (b) Watt (ā§ąāĻžāĻ) (c) Ampere (āĻāĻŽā§āĻĒāĻŋāĻ¯āĻŧāĻžā§°) (d) Ohm (āĻāĻŽ)
Ans: (d) Ohm (āĻāĻŽ)
Explanation: Resistance is measured in ohms. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻĒā§ā§°āĻ¤āĻŋā§°ā§āĻ§ āĻāĻŽāĻ¤ āĻŽāĻžāĻĒ āĻā§°āĻž āĻšāĻ¯āĻŧāĨ¤
Q8. What is electric power ? (āĻŦāĻŋāĻĻā§āĻ¯ā§ā§ āĻļāĻā§āĻ¤āĻŋ āĻāĻŋ ?)
Options: (a) Energy (āĻļāĻā§āĻ¤āĻŋ) (b) Work (āĻāĻžāĻŽ) (c) Rate of doing work (āĻāĻžāĻŽ āĻā§°āĻžā§° āĻšāĻžā§°) (d) Force (āĻŦāĻ˛)
Ans: (c) Rate of doing work (āĻāĻžāĻŽ āĻā§°āĻžā§° āĻšāĻžā§°)
Explanation: Power tells how fast work is done. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻļāĻā§āĻ¤āĻŋāĻ¯āĻŧā§ āĻāĻžāĻŽ āĻā§°āĻžā§° āĻāĻ¤āĻŋ āĻŦā§āĻāĻžāĻ¯āĻŧāĨ¤
Q9. Unit of electric power is: (āĻļāĻā§āĻ¤āĻŋā§° āĻāĻāĻ āĻāĻŋ ?)
Options: (a) Volt (āĻā§āĻ˛ā§āĻ) (b) Watt (ā§ąāĻžāĻ) (c) Ohm (āĻāĻŽ) (d) Ampere (āĻāĻŽā§āĻĒāĻŋāĻ¯āĻŧāĻžā§°)
Ans: (b) Watt (ā§ąāĻžāĻ)
Explanation: Power is measured in watts. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻļāĻā§āĻ¤āĻŋ ā§ąāĻžāĻāĻ¤ āĻŽāĻžāĻĒ āĻā§°āĻž āĻšāĻ¯āĻŧāĨ¤
Q10. Formula of electric power is: (āĻļāĻā§āĻ¤āĻŋā§° āĻ¸ā§āĻ¤ā§āĻ° āĻāĻŋ ?)
Options: (a) P = IR (b) P = V/I (c) P = VI (d) P = R/V
Ans: (c) P = VI
Explanation: Power = Voltage × Current. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻļāĻā§āĻ¤āĻŋ = āĻā§āĻ˛ā§āĻā§āĻ × āĻ§āĻžā§°āĻžāĨ¤
Quick Revision (āĻĻā§ā§°ā§āĻ¤ āĻĒā§āĻ¨ā§°āĻžāĻŦā§āĻ¤ā§āĻ¤āĻŋ)
- Current → Flow of charge (āĻā§ąā§āĻļā§° āĻĒā§ā§°āĻŦāĻžāĻš)
- Voltage → Work per charge (āĻāĻžāĻŽ/āĻā§ąā§āĻļ)
- Resistance → Opposes current (āĻ§āĻžā§°āĻžā§° āĻŦāĻžāĻ§āĻž)
- Power → P = VI
- Ohm’s Law → V = IR