Ohm’s Law (Formula) is the most important law of electricity if we talk about the basic concept of Electronics because it defines the relationship between the current, resistance and voltage. I am providing you Multiple Choice Questions and Answers (MCQs) on Ohm’s Law with the commitment to facilitate the students, technicians and teachers of different technical fields for the sake of test/interview or any quiz throughout the world.
Read More: MCQs on Types of Resistors
Ohm’s Law – Definition
According to the simplest definition of ohm’s law is current (I) is directly proportional to the Voltage (V) and inversely proportional to the Resistance (R).
Ohm’s Law MCQs (Multiple Choice Questions and Answers)
Q1. The relationship between current, resistance and voltage is determined by _______________.
- Georg Simon Ohm (1826 AD)
- William Shockley (1836 AD)
- John Bardeen (1816 AD)
- Hans Christian (1846 AD)
Answer: a
Q2. In the Ohm’s Law, Current (I) is ___________ proportional to the Resistance (R).
- Directly
- Indirectly
Answer: b
Q3. In the Ohm’s Law, Current (I) is ___________ proportional to the Voltage (V).
- Directly
- Indirectly
Answer: a
Q4. Ohm’s law formula is __________________.
- I = V/R
- V = IR
- R = V/I
- All are correct
Answer: d
Q5. When 500 Voltage (V) applied to the 2KΩ Resistance (R) then what will be Current (I) according to the Ohm’s Law.
- 0.50 Amp
- 0.25 Amp
- 0.75 Amp
- 4 Amp
Answer: b
Q6. What is the Resistance (R) _____________ of a bulb when draws 0.25A from a 24V battery Source?
- 75Ω
- 96Ω
- 85Ω
- 88Ω
Answer: b
Q7. The Unit of Current (I) is _______________.
- Ohm
- Ampere
- Volt
- Siemen
Answer: b
Q8. The Unit of Resistance (R) is _______________.
- Ohm
- Ampere
- Volt
- Siemen
Answer: a
Q9. The Unit of Voltage (V) is _______________.
- Siemen
- Volt
- Ohm
- Ampere
Answer: b
Q10. 1mA is equal to _______________.
- 100µA
- 10µA
- 1000µA
- 10A
Answer: c
Q11. The Resistance of the Tungsten filament in a light-bulb is _________.
- Linear
- Non-Linear
- Fixed
- a & b are correct
Answer: b
Q12. Most common types of non-linear resisters are ___________________.
- Thermistor Resistor
- Varistor Resistor
- Photo Resistor or LDR Resistor
- Surface Mount (SMD) Resistor
- All are correct
- a & b are correct
Answer: e
Q13. A graph of Current (I) versus Resistance (R) with Voltage (V) constant is called a ____________.
- Ordinate
- Hyperbola
- Abscissa
- All are correct
Answer: b
Q14. The unit of electric power is watt which name is the honour for Scottish inventor _______________
- James Watt (1736–1819)
- Alexander Graham Bell (1847–1922)
- Otto Blathy (1860–1939)
- Walter Houser Brattain (1902–1987)
Answer: a
Q15. One horse power is equal to ____________________.
- 576 watt
- 796 watt
- 746 watt
- 646 watt
Answer: c
Q16. The _________ is a basic unit of work or energy.
- Watt
- Joule
- Kelvin
- Tesla
Answer: b
Q17. Power Formula is equal to _________________.
- P = E/T
- P = W/T
- P = W/ΔT
- All are correct
Answer: d
Q18. The SI unit of work or energy is the joule which name is the honour for English physicist _______________.
- James Prescott Joule (1818–1889)
- James Watt (1736–1819)
- Alexander Graham Bell (1847–1922)
- Walter Houser Brattain (1902–1987)
Answer: a
Q19. One joule (J) is equal to one ____________.
- Volt-Coulomb
- Joule-Coulomb
- Horsepower
- Ampere-Joule
Answer: a
Q20. One joule is equal to _____________eV .
- 6.25 × 1018
- 7.45 × 1018
- 6.25 × 1033
- 6.25 × 10-18
Answer: a
Q21. The power dissipated by a resistance is directly proportional to _______________.
- V2
- I2
- V
- a & b are correct
Answer: d
Q22. The electric shock of 0.1 to 0.2 Amp can cause the _______________.
- Mild sensation
- Threshold of sensation
- Death
- Painful
Answer: c
Q23. The resistance in the open circuit is _________________
- Infinitely low
- Infinitely High
- Zero
- a & b are correct
Answer: b
Q24. An open circuit has zero current. T/F
Answer: True
Q25. The resistance in the short circuit is _________________
- Infinitely low
- Infinitely High
- Zero
- a & b are correct
Answer: c
Q26. A short circuit has excessive current. T/F
Answer: True
Q27. Kilowatt-hour (kWh) is a large unit of electrical ________________.
- work
- energy
- conductance
- power
Answer: b