This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 3 Current Electricity – Quiz 27 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 27 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is NOT a good insulator? A) Rubber. B) Wood. C) Iron. D) Plastic. Show Answer Correct Answer: C) Iron. 2. Why is it important to have a switch in an electrical circuit? A) To increase the voltage of the circuit. B) To control the flow of electricity. C) To decrease the resistance in the circuit. D) To change the direction of the current. Show Answer Correct Answer: B) To control the flow of electricity. 3. When a switch is turned on, you close a circuit so that it is ..... A) Incomplete. B) Inactive. C) Complete. D) Broken. Show Answer Correct Answer: C) Complete. 4. When is it easiest for a person to build up static electricity? A) After a rainstorm when the air is warm and humid. B) During the winter when the air is dry. C) After a lightning strike when the air is full of electricity. D) During the spring when the ground is wet. Show Answer Correct Answer: B) During the winter when the air is dry. 5. What is the colour of live wire insulation? A) Red. B) Blue. C) Yellow. D) Brown. Show Answer Correct Answer: A) Red. 6. Electromagnets are strong magnets that can be turned on and off. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. Of the following, the copper conductor that has the least resistance is: A) Thin, long and hot. B) Thick, short and cool. C) Thick, long and hot. D) Thin, short and cool. Show Answer Correct Answer: B) Thick, short and cool. 8. A circuit that has more than one path for electricity to follow is a ..... A) Series. B) Static. C) Broken. D) Parallel. Show Answer Correct Answer: D) Parallel. 9. What unit is used to measure electric current? A) Volt. B) Ohm. C) Ampere. D) Watt. Show Answer Correct Answer: C) Ampere. 10. How do you calculate total resistance in a series circuit? A) R total = R1 * R2 * R3 * * Rn. B) R total = R1 + R2 + R3 + + Rn. C) R total = 1/(1/R1 + 1/R2 + 1/R3 + + 1/Rn). D) R total = R1-R2-R3 Rn. Show Answer Correct Answer: B) R total = R1 + R2 + R3 + + Rn. 11. Generators generate A) Electricity. B) Mechanical energy. C) Heat. D) Chemical energy. Show Answer Correct Answer: A) Electricity. 12. Michael tries to pick up a small bit of plastic wrap that is on his desk. Michael's hand has a negative charge. The pieceof plastic has a positive charge. What will happen when Michael's hand gets close to the plastic? A) The plastic will neither move towards or away from Michael's hand. B) The plastic will circle around Michael's hand. C) The plastic will move away from Michael's hand. D) The plastic will move towards Michael's hand. Show Answer Correct Answer: D) The plastic will move towards Michael's hand. 13. Two resistors R1 = 6 $\Omega$ and R2 = 12 $\Omega$ are connected in parallel to each other and in series to R3 = 2 $\Omega$. An ammeter measures an electric current of 3 A flowing though resistor R3. What is the net voltage applied to the circuit? A) 6 V. B) 12 V. C) 18 V. D) 24 V. Show Answer Correct Answer: C) 18 V. 14. In which part of a circuit is electrical energy changed into other forms of energy? A) In the battery. B) In the switch. C) In the wire. D) In the load. Show Answer Correct Answer: D) In the load. 15. Electricity cannot flow through porcelain. Porcelain is therefore a(n) A) Conductor. B) Insulator. C) Electron. D) Conductor and insulator. Show Answer Correct Answer: B) Insulator. 16. Electrical cell converts A) Electrical energy to chemical energy. B) Chemical energy to electrical energy. C) Chemical to potential energy. D) None of the above. Show Answer Correct Answer: B) Chemical energy to electrical energy. 17. Charge through a cross-section of a conductor is given by Q = 5t$^{2}$-2t coulomb. Find the average current through the conductor in the interval t$_{1}$ = 2 s to t$_{2}$ = 4 s. A) 14 A. B) 28 A. C) 56 A. D) 7 A. Show Answer Correct Answer: B) 28 A. 18. Which of the following should you not do near a downed powerline? A) Stay in your car if no other danger is present. B) Make sure to keep both hands on the car when stepping out. C) Jump out and land on both feet without touching the car. D) Shuffle away in small steps until at least 35 feet away. Show Answer Correct Answer: B) Make sure to keep both hands on the car when stepping out. 19. When n equal resistances of values R are connected in parallel, then the effective resistance is ..... A) N R. B) R / n. C) N / R. D) None of the above. Show Answer Correct Answer: B) R / n. 20. The rate at which electrical energy is used may be measured in. A) Watt/second. B) Wattsecond. C) Watt. D) Joulesecond. Show Answer Correct Answer: C) Watt. 21. Good conductors A) Have low resistance. B) Allow electrons to flow easily. C) Are frequently made from metals. D) All of the above. Show Answer Correct Answer: D) All of the above. 22. Which of the following is not an example of safety device? A) Fuse. B) Circuit breaker. C) Earth wire. D) Battery. Show Answer Correct Answer: D) Battery. 23. If a circuit has a voltage of 12V and a resistance of 4$\Omega$, what is the current? A) 3A. B) 6A. C) 4A. D) 2A. Show Answer Correct Answer: A) 3A. 24. Which will make an electromagnet WEAKER? A) More coils of wire around nail. B) An extra battery attached. C) Thicker wire. D) Remove one of the nails from the coils. Show Answer Correct Answer: D) Remove one of the nails from the coils. 25. Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2m. The ratio of e.m.f.'s of the two cells is A) 3:5. B) 5:3. C) 4:3. D) 3:4. Show Answer Correct Answer: B) 5:3. ← PreviousNext →Related QuizzesClass 12 Physics (Part I) Chapter 3 Current Electricity Quiz 1Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 2Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 3Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 4Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 5Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 6Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 7Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 8Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 9Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books