Questions Electrician and Wireman: Basic Electricity Concept 3

Subject: Basic Electricity Concept 3

**Part 3: Objective questions and answers of Basic Electricity Concept**

**Q1. In any electric network, the sum of the incoming current at each junction is equal to the sum of the outgoing current. What is the name of the law?**

a) Ohm's law

b) Kirchhoff's second law

c) Laws of resistance

d) Kirchhoff's first law

**Q2. Which one of the following has a negative temperature coefficient?**

a) Brass

b) Mercury

c) Electrolytes

d) Silver

**Q3. Kilowatt hour (kWh) is the unit of**

a) electrical power

b) electrical energy

c) quantity of electricity

d) Electric current

**Q4. The unit of the quantity of electricity is**

a) ampere/second

b) coulomb

c) mho

d) watt- second

**Q5. In a circuit 20mA current is flowing across a resistance, at 12 V supply source. What will be the current, when the voltage is increased to 24 V?**

a) 20 mA

b) 30 mA

c) 40 mA

d) 60 mA

**Q6. The unit of resistance is**

a) mho

b) volt

c) ohm

d) ampere

**Q7. Which law states the relationship between the current, voltage, and resistance in a closed circuit at constant temperature?**

a) Kirchoff's first law

b) Kirchoff's second law

c) Joule's law

d) Ohm's law

**Q8. Number of protons in the silver atom :**

a) 8

b) 12

c) 16

d) 47

**Q9. A 12 ohm resistor connected across a 60 V DC source. Calculate the current Flows through the resistor.**

a) 4 amperes

b) 5 amperes

c) 10 amperes

d) 12 amperes

**Q10. What is the unit of specific resistance?**

a) ohm/cm square

b) ohm/meter

c) micro ohm/cm cube

d) milli ohm/m square

**Q11. Which law states that “At each junction of current, the sum of the incoming currents is equal to the sum of the outgoing currents"?**

a) Ohm's law

b) Kirchhoff's current law

c) Kirchhoff's voltage law

d) Lenz's law

**Q12. Which material is having the property of a negative temperature coefficient?**

a) Manganin

b) Aluminum

c) Eureka

d) Carbon

**Q13. If the diameter of a metal wire of a given length is doubled, then its resistance will**

a) be doubled

b) be halved

c) remain the same

d) be 1/4th time

** **

**Q14. What is the unit of commercial Electric power?**

a) ampere hour

b) kilowatt hour

c) kilowatt

d) ampere second

**Q15. The S.I. unit of electric charge is**

a) volt/ohm

b) ampere/second

c) watt second

d) coulomb

**Q16. The potential difference is measured by**

a) ammeter

b) ohmmeter

c) voltmeter

d) wattmeter

**Q17. Four equal resistors are connected in series and their total resistance is 800 ohms. What would be the total resistance when they are connected in parallel?**

a) 10 ohms 30 mA

b) 50 ohms

c) 400 ohms

d) 1600 ohms

**Q18. As per Ohm's law statement, the circuit current is inversely proportional to:**

a) voltage

b) resistance

c) specific resistance

d) quantity of electricity

**Q19. How many protons in germanium atom?**

a) 14

b) 29

c) 32

d) 34

**Q20. What is the commercial unit of Electrical energy?**

a) Watt hour

b) Kilo volt ampere

c) Kilo watt hour

d) Volt ampere

**Part 3: Objective questions and answers of Basic Electricity Concept**

Q1. Answer d

Q2. Answer c

Q3. Answer b

Q4. Answer b

Q5. Answer d

Q6. Answer c

Q7. Answer d

Q8. Answer d

Q9. Answer: b

Q10. Answer c

Q11. Answer b

Q12. Answer d

Q13. Answer d

Q14. Answer c

Q15. Answer d

Q16. Answer c

Q17. Answer b

Q18. Answer b

Q19. Answer c

Q20. Answer: c

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