This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part I > Class 12 Physics (Part I) Chapter 3 Current Electricity – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Electricity is used to turn on lights, watch television, and charge cell phones. Electricity is made up of traveling through wires that are connected to a power source. A) Electrons. B) Radiation. C) Energy. D) Protons. Show Answer Correct Answer: A) Electrons. 2. Calculate resistance of an electric bulb which allows a 10 A current when connected to 220 V power source. [Use V = IR] A) 10 ohm. B) 12 ohm. C) 22 ohm. D) 32 ohm. Show Answer Correct Answer: C) 22 ohm. 3. How to you calculate the total resistance in a series circuit? A) R1 = R2 = R3. B) R1 + R2+ R3. C) R1-R2-R3. D) 1/R1 + 1/R2 + 1/R3. Show Answer Correct Answer: B) R1 + R2+ R3. 4. A piece of copper and another ofgermanium are cooled from roomtemperature to 80 K. The resistance of A) Each of them increases. B) Each of them decreases. C) Copper increases and germaniumdecreases. D) Copper decreases and germaniumincreases. Show Answer Correct Answer: D) Copper decreases and germaniumincreases. 5. The mathematical expression of Kirchhoff's first law is ..... A) $\sum_x^y$. B) $\sum_x^y$. C) $\sum_x^y$. D) None of the above. Show Answer Correct Answer: A) $\sum_x^y$. 6. Conventionally, the direction of the current is taken as A) The direction of flow of negative charge. B) The direction of flow of molecules. C) The direction of flow of atoms. D) The direction of flow of positive charge. Show Answer Correct Answer: D) The direction of flow of positive charge. 7. The force that pushes the electricity through a circuit is called ..... A) Voltage. B) Resistance. C) Current. D) Switch. Show Answer Correct Answer: A) Voltage. 8. What does an ammeter measure? A) Current. B) Voltage. C) Resistance. D) None of the above. Show Answer Correct Answer: A) Current. 9. Work done to move a change around the complete circuit is called. A) Voltage. B) Resistance. C) Emf. D) Current. Show Answer Correct Answer: C) Emf. 10. What do electric generators do A) Transform electrical energy to mechanical energy. B) Transform mechanical energy to sound. C) Transform electrical energy to potential energy. D) Transform mechanical energy to electrical energy. Show Answer Correct Answer: D) Transform mechanical energy to electrical energy. 11. Identify the definition of sensitivity of a galvanometer from the following. A) Ratio of deflection in the galvanometer to half the unit change in unknown resistance. B) Ratio of unit change in unknown resistance to the deflection in the galvanometer. C) Ratio of unit change in unknown resistance to twice the deflection in the galvanometer. D) Ratio of deflection in the galvanometer to the unit change in unknown resistance. Show Answer Correct Answer: D) Ratio of deflection in the galvanometer to the unit change in unknown resistance. 12. The amount of obstruction to the flow of current is known as ..... A) Charge. B) Current. C) Voltage. D) Resistance. Show Answer Correct Answer: D) Resistance. 13. An electric current flows through a continuous loop known as a ..... A) Circuit. B) Switch. C) Field. D) Domain. Show Answer Correct Answer: A) Circuit. 14. A 220 volt, 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will be A) 250W. B) 500W. C) 750W. D) 1kW. Show Answer Correct Answer: A) 250W. 15. Which of the following is not a practical application of static electricity? A) Electrostatic Precipitators. B) Paint Spraying. C) Photocopying machines. D) Driving a Tractor. Show Answer Correct Answer: D) Driving a Tractor. 16. What is the rate at which energy is transferred in a circuit called? A) Resistance. B) Voltage. C) Power. D) Current. Show Answer Correct Answer: C) Power. 17. Which sign is associated with a positive charge? A) $. B) =. C) +. D) -. Show Answer Correct Answer: C) +. 18. The mathematical relationship among Voltage, Current, and Resistance A) Edison's Law. B) Tesla's Law. C) Faraday's Law. D) Ohm's Law. Show Answer Correct Answer: D) Ohm's Law. 19. Like charges ..... A) Attract. B) Repel. C) None of the above. D) None of the above. Show Answer Correct Answer: B) Repel. 20. Define electromotive force. A) It is the work done by the source in driving a unit charge around a complete circuit. B) It is a measure of the flow of electric charge through a given cross-section of a conductor. C) It is the work done by the source in driving charges around a complete circuit. D) It is a measure of the rate of flow of electric charge through a given cross-section of a conductor. Show Answer Correct Answer: A) It is the work done by the source in driving a unit charge around a complete circuit. 21. What is the main function of a turbine? A) Spinning. B) Reducing the voltage of an electrical current. C) Producing a magnetic field. D) Increasing the voltage of an electrical current. Show Answer Correct Answer: A) Spinning. 22. An electric circuit is ..... A) An object that resists the flow of energy. B) An open pathway that can carry electric current. C) A continuous pathway that can carry an electric current. D) An object that attracts metal. Show Answer Correct Answer: C) A continuous pathway that can carry an electric current. 23. Known as Naturally Occurring electricity A) Static Electricity. B) Current Electricity. C) All the above. D) None of the above. Show Answer Correct Answer: A) Static Electricity. 24. What is the symbol used for charge in equations? A) V. B) R. C) Q. D) I. Show Answer Correct Answer: C) Q. 25. A circuit with the switch open allows A) Electricity to flow so the device is off. B) Electricity to flow so the device is on. C) Electricity to not flow so the device is on. D) Electricity to not flow so the device is off. Show Answer Correct Answer: D) Electricity to not flow so the device is off. 26. In the circuit, the bulb lights up because there is ..... flowing in the closed circuit. A) Voltage. B) Resistance. C) Battery. D) Current. Show Answer Correct Answer: D) Current. 27. In an electric circuit, electron flow from a point of ..... potential to the point of ..... potential A) (a) lower. B) (b) Higher. C) Midium. D) Option a and b. Show Answer Correct Answer: D) Option a and b. 28. What causes resistance? A) Electrons colliding with ions in the insulator. B) Electrons colliding with ions in the conductor. C) Protons colliding with ions in the conductor. D) None of the above. Show Answer Correct Answer: B) Electrons colliding with ions in the conductor. 29. The flow of electrical energy is called a(n) A) Electron. B) Insulator. C) Circuit. D) Current. Show Answer Correct Answer: D) Current. 30. The resistance of resistor 1 is twice the resistance of resistor 2. The two are connected in parallel and a potential difference is maintained across the combination. Then: A) The current in 1 is half that in 2. B) The potential difference across 1 is twice that across 2. C) The potential difference across 1 is half that across 2. D) The current in 1 is twice that in 2. Show Answer Correct Answer: A) The current in 1 is half that in 2. 31. Fill in the Blank:Current Electricity is measured in ..... A) Electrons. B) Speed. C) Volts. D) Amperes. Show Answer Correct Answer: D) Amperes. 32. ..... electricity is temporary. A) Mains supply. B) Static. C) None of the above. D) None of the above. Show Answer Correct Answer: B) Static. 33. Blocks electricity from moving through A) Filament. B) Source. C) Conductor. D) Insulator. Show Answer Correct Answer: D) Insulator. 34. What does the term 'potential difference' refer to? A) Resistance per unit length. B) Work done per unit charge. C) Charge per unit time. D) Current per unit voltage. Show Answer Correct Answer: B) Work done per unit charge. 35. A 2.0-ohm resistor and a 4.0-ohm resistor are connected in series with a 12-volt battery. If the current through the 2.0-ohm resistor is 2.0 amperes, the current through the 4.0-ohm resistor is A) 1.0 A. B) 2.0 A. C) 4.0 A. D) 3.0 A. Show Answer Correct Answer: B) 2.0 A. 36. A wire of 10 ohm resistance is stretched to thrice its original length . Calculate the new resistivity A) 3 times. B) 9 times. C) No change. D) 10. Show Answer Correct Answer: C) No change. 37. A room heater is marked as 1000watt-200V, find the percentage change in the power of heater if voltage drops 120V A) 72%. B) 64%. C) 36%. D) 54%. Show Answer Correct Answer: B) 64%. 38. When capacitors is arrange in series (3 capacitors), the equivalent capacitance C is A) C = C$_{1}$ + C$_{2}$ + C$_{3}$. B) C = QV$_{1}$ + QV$_{2}$ + QV$_{3}$. C) 1/C = 1/C$_{1}$ + 1/C$_{2}$ + 1/C$_{3}$. D) C = CR$_{1}$ + CR$_{2}$ + CR$_{3}$. Show Answer Correct Answer: C) 1/C = 1/C$_{1}$ + 1/C$_{2}$ + 1/C$_{3}$. 39. A complete, connected circuit: A) Closed Circuit. B) Open Circuit. C) Conductor Circuit. D) None of the above. Show Answer Correct Answer: A) Closed Circuit. 40. What is current electricity? A) Current electricity involves a continuous flow of protons. B) Current electricity is a single transfer of electrons. C) Current electricity involves a continuous flow of neutrons. D) Current electricity is a steady flow of electrons. Show Answer Correct Answer: D) Current electricity is a steady flow of electrons. 41. Mrs. Rodriguez has a battery, wooden spoon, copper wire, metal paperclip, and a light bulb. Which materials does Mrs. Rodriguez need in order to create a complete circuit? A) Battery, wooden spoon, copper wire, and light bulb. B) Battery, metal paperclip, copper wire, and light bulb. C) Metal paperclip, copper wire, and light bulb. D) Battery, wooden spoon, and light bulb. Show Answer Correct Answer: B) Battery, metal paperclip, copper wire, and light bulb. 42. What device is used to measure electric current in a circuit? A) Thermometer. B) Ohmmeter. C) Ammeter. D) Voltmeter. Show Answer Correct Answer: C) Ammeter. 43. The melting point of tungsten is A) 3380 $^{o }$C. B) 3580 $^{o }$C. C) 3680 $^{o }$C. D) 3280 $^{o }$C. Show Answer Correct Answer: A) 3380 $^{o }$C. 44. A voltmeter measures the voltage across a component. Where should it be positioned in a circuit in order to measure voltage correctly? A) In series with the component. B) In parallel with the component. C) Over the cell. D) Anywhere in the circuit. Show Answer Correct Answer: B) In parallel with the component. 45. What kind of circuits power the electrical devices in homes and buildings? A) Series circuits. B) Simple circuits. C) Parallel circuits. D) GFCI circuits. Show Answer Correct Answer: C) Parallel circuits. 46. Aclosedpath in which currentflows isknown as an Electric circuit. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 47. The physical quantity responsible for the current flow is A) Resistance. B) Electric potential. C) Electricity. D) Electric potential difference. Show Answer Correct Answer: D) Electric potential difference. 48. An electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s. [Use H = I$^{2}$ X R X t] A) 1000 joules. B) 15000 joules. C) 30000 joules. D) 2000 joules. Show Answer Correct Answer: B) 15000 joules. 49. Give an example of conductor A) Glass. B) Copper wire. C) Mercury. D) Pure water. Show Answer Correct Answer: B) Copper wire. 50. Moving a permanent magnet through a coil of wire will A) A current will be generated in the wire. B) The wire will become an electromagnet. C) Demagnetize the magnet. D) The magnet will become electrified. Show Answer Correct Answer: A) A current will be generated in the wire. 51. What potential difference is required across an 8.0-$\Omega$ resistor to cause 2.0 A to flow through it? A) 8.0 V. B) 32 V. C) 4.0 V. D) 16 V. Show Answer Correct Answer: D) 16 V. 52. What is Direct Current (DC)? A) Current in which electric charges move in one direction. B) Current in which electric charges move in multiple directions. C) Current that does not involve electric charges. D) None of the above. Show Answer Correct Answer: A) Current in which electric charges move in one direction. 53. What happens to the electrons when you rub a balloon on your hair and it sticks to a wall? A) Electrons are transferred from the wall to the balloon. B) Electrons are transferred from the balloon to the wall. C) Electrons are transferred from your hair to the balloon. D) Electrons are transferred from the balloon to your hair. Show Answer Correct Answer: C) Electrons are transferred from your hair to the balloon. 54. Electricity flows freely it is considered a ..... no breaks A) Open circuit. B) Fuse. C) Closed circuit. D) Short circuit. Show Answer Correct Answer: C) Closed circuit. 55. What does AC stand for? A) Power plants. B) Direct current. C) Alternating current. D) None of the above. Show Answer Correct Answer: C) Alternating current. 56. What is the resistance for a Red, Green, Blue color resistor? A) 250K ohms. B) 25K ohms. C) 25, 000, 000 ohms. D) 250, 000 ohms. Show Answer Correct Answer: C) 25, 000, 000 ohms. 57. What is the amount of electricity that can be fatal. A) 10V. B) 0.001A. C) 0.1A. D) 100V. Show Answer Correct Answer: C) 0.1A. 58. Physics is the study of matter and energy A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 59. Kirchhoff's II law for the electric network is based on: A) Law of conservation of energy. B) Law of conservation of mass. C) Law of conservation of angular momentum. D) Law of conservation of charge. Show Answer Correct Answer: A) Law of conservation of energy. 60. When electricity flows-a current is moving A) Static electricity. B) Parallel circuit. C) Current-electricity. D) Dishcharge. Show Answer Correct Answer: C) Current-electricity. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books