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__

__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 × 10
^{18} - 7.45 × 10
^{18} - 6.25 × 10
^{33} - 6.25 × 10
^{-18}

**Answer: ****a**

**Q21. The power dissipated by a resistance is directly proportional to _______________.
**

- V
^{2} - I
^{2} - 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**