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 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Graphs consists of dependent and independent variables A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. A material where electricity does flow easily A) Filament. B) Conductor. C) Insulator. D) Circuit. Show Answer Correct Answer: B) Conductor. 3. Kilowatt hour is the commercial unit of ..... A) Electric power. B) Electrical energy. C) Time. D) None of the above. Show Answer Correct Answer: B) Electrical energy. 4. What is the amount of charge that passes a point in a wire per unit of time? A) Voltage. B) Current. C) Resistance. D) Power. Show Answer Correct Answer: B) Current. 5. By increasing the temperature, the specific resistance of a conductor and a semiconductor: A) Increases for both. B) Decreases for both. C) Increases, decreases respectively. D) Decrease, increases respectively. Show Answer Correct Answer: C) Increases, decreases respectively. 6. Copper is used in wiring because it is an excellent ..... of electricity. A) Circuit breaker. B) Fuse. C) Insulator. D) Conductor. Show Answer Correct Answer: D) Conductor. 7. Like poles of a magnet A) Attract. B) Repel. C) All the above. D) None of the above. Show Answer Correct Answer: B) Repel. 8. A wire carrying a current is placed in a magnetic field. What will happen to the wire? A) It will experience a force perpendicular to both the current and the magnetic field. B) It will experience a force parallel to the current. C) It will not experience any force. D) It will experience a force parallel to the magnetic field. Show Answer Correct Answer: A) It will experience a force perpendicular to both the current and the magnetic field. 9. In a parallel circuit, if one connection is broken, all of the connections stop working. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 10. In a series circuit with three resistors, if the total resistance is 12 ohms and two of the resistors are 3 ohms each, what is the resistance of the third resistor? A) 6 ohms. B) 9 ohms. C) 3 ohms. D) 4 ohms. Show Answer Correct Answer: D) 4 ohms. 11. Negatively charged electrons flow toward positively charged protons. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. What is the symbol used for current in equations? A) V. B) C. C) R. D) I. Show Answer Correct Answer: D) I. 13. Used to open or close a circuit A) Conductor. B) Switch. C) Insulator. D) Terminal. Show Answer Correct Answer: B) Switch. 14. An electric iron has a rating of 750 W, 220 V. Calculate current passing through it. [Use P = IV] A) 5 A. B) 6 A. C) 7 A. D) 3.4 A. Show Answer Correct Answer: D) 3.4 A. 15. In Joule's heating law, when R and t areconstant, if the H is taken along the yaxis and I$^{2}$ along the x axis, the graph is A) Ellipse. B) Straight line. C) Circle. D) Parabola. Show Answer Correct Answer: B) Straight line. 16. What are the two conditions for electric current? A) An energy source and an open circuit. B) A ground and a closed circuit. C) A ground and an open circuit. D) An energy source and a closed circuit. Show Answer Correct Answer: D) An energy source and a closed circuit. 17. What is the term for the reciprocal of resistance? A) Resistivity. B) Voltage. C) Current. D) Conductance. Show Answer Correct Answer: D) Conductance. 18. Which description best identifies the cause of static electricity? A) A lack of any neutral charges. B) A lack of any positive or negative charges. C) An imbalance of positive and negative charges. D) An exact balance of positive, negative, and neutral charges. Show Answer Correct Answer: C) An imbalance of positive and negative charges. 19. An electrical build up caused by rubbing us known as ..... A) Attraction. B) Lightning. C) Friction. D) Discharge. E) Volts. Show Answer Correct Answer: C) Friction. 20. Clothes sticking together in the dryer is an example of A) Static Electricity. B) Current Electricity. C) All the above. D) None of the above. Show Answer Correct Answer: A) Static Electricity. 21. The carbon resistor has three orange bands. The maximum value of resistance offered by the resistor will be ..... kilo-ohm. A) 33. B) 26.4. C) 49.6. D) 39.6. Show Answer Correct Answer: A) 33. 22. The motion of charged particles create electric current. The motion of which particles create current in a conductor, in gases and in electrolyte . A) Conductor-electrons gases-moleculeselectrolytes-ions. B) Conductor-molecules gases-ionselectrolytes-electrons. C) All the above. D) None of the above. Show Answer Correct Answer: A) Conductor-electrons gases-moleculeselectrolytes-ions. 23. What is magnetism? A) An invisible force produced by certain metals. B) A visible force produced by certain metals. C) An invisible force produced by all metals. D) A visible force produced by mixtures of metals. Show Answer Correct Answer: A) An invisible force produced by certain metals. 24. Which of the following is a characteristic of current electricity? A) It is stored in batteries. B) It is a flow of electric charge through a conductor. C) It occurs naturally in the atmosphere. D) It is caused by friction. Show Answer Correct Answer: B) It is a flow of electric charge through a conductor. 25. Which of the following is a characteristic of static electricity? A) It involves a continuous flow of electrons. B) It is generated by friction between two objects. C) It is used to power household appliances. D) It requires a closed circuit to flow. Show Answer Correct Answer: B) It is generated by friction between two objects. 26. When a magnetic South pole is brought close to a magnetic North pole, the magnets will A) Repel. B) Attract. C) Cancel each other out. D) Create sparks. Show Answer Correct Answer: B) Attract. 27. Why are parallel circuits more useful in more appliances than series circuits? A) Parallel circuits are cheaper to build. B) They allow many appliances to be used at one time. C) Parallel circuits take up less room. D) Series circuits produce short circuits, but parallel circuits don't. Show Answer Correct Answer: B) They allow many appliances to be used at one time. 28. Lightning strike is the electric discharge from cloud to ground. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 29. If a resistor has a resistance of 10$\Omega$, what is its conductance? A) 0.1 S. B) 1 S. C) 5 S. D) 0.5 S. Show Answer Correct Answer: A) 0.1 S. 30. When a conductor carries a current, the number of conduction electrons that flow in the conductor for 10 s is 3.75 $\times10^{20}$ A) 6.0 A. B) 3.8 A. C) 10 A. D) 4.2 A. Show Answer Correct Answer: A) 6.0 A. 31. Which best describes a parallel circuit? A) Electricity flows along one pathway. B) The flow of electricity comes from more than 1 load. C) The flow of electricity comes from more than one source. D) Electricity flows along more than one pathway. Show Answer Correct Answer: D) Electricity flows along more than one pathway. 32. When you flip a light switch on and off you are closing and opening a circuit. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 33. Adding another light bulb to a series circuit would ..... A) Make the lights dimmer. B) Turn off the lights. C) Burn out the lights. D) Make the lights brighter. Show Answer Correct Answer: A) Make the lights dimmer. 34. 32 cells each of emf 3 V are connected in series and kept in a box. Externally, the combination shows an emf of 84 V. The number of cells reversed in the connection is ..... A) 8. B) 0. C) 4. D) 2. Show Answer Correct Answer: D) 2. 35. A toaster operating at 240 V has aresistance of 120 $\Omega$. Its power is A) 240 W. B) 480 W. C) 2 W. D) 400 W. Show Answer Correct Answer: B) 480 W. 36. One coulomb of electrons is equal to one ..... A) Volt. B) Amp. C) Ohm. D) Watt. Show Answer Correct Answer: B) Amp. 37. The best instrument for accurate measurement of emf of a cell is A) Ammeter. B) Voltmeter. C) Potentiometer. D) Wheatstone bridge. Show Answer Correct Answer: C) Potentiometer. 38. What is the significance of the equivalent capacitance in a circuit? A) It indicates the power consumption of the circuit. B) It determines the voltage across each capacitor in a circuit. C) It is used to measure the resistance of a circuit. D) The equivalent capacitance allows for easier analysis and calculation of total capacitance in circuits with multiple capacitors. Show Answer Correct Answer: D) The equivalent capacitance allows for easier analysis and calculation of total capacitance in circuits with multiple capacitors. 39. Kelly wants to start a science club that investigates the interactions between electrical energy and magnetism. What is the main process that this club will investigate? A) Electrical safety. B) Electronic devices. C) Electromagnetism. D) Electric charge. Show Answer Correct Answer: C) Electromagnetism. 40. Known as Human Harnessed electricity A) Static Electricity. B) Current Electricity. C) All the above. D) None of the above. Show Answer Correct Answer: B) Current Electricity. 41. What is alternating current? A) Current that flows in a loop. B) Current that flows in one direction, then in the reverse direction. C) Current that flows randomly. D) None of the above. Show Answer Correct Answer: B) Current that flows in one direction, then in the reverse direction. 42. According to ohm's law A) Current is directly proportional to the potential difference. B) Current is inversely proportional to the potential difference. C) Current is directly proportional to the resistance. D) None of the above. Show Answer Correct Answer: A) Current is directly proportional to the potential difference. 43. Which of the following best describes static electricity? A) A build-up of electric charges on the surface of an object. B) The conversion of electrical energy into mechanical energy. C) The conversion of electrical energy into light energy. D) A continuous flow of electric charges through a conductor. Show Answer Correct Answer: A) A build-up of electric charges on the surface of an object. 44. Name the instrument used to control current in an electric circuit. A) Valnometer. B) Rheostat. C) Galvanometer. D) Ammeter. Show Answer Correct Answer: B) Rheostat. 45. Which way will NOT increase the strength of the magnetic field of an electromagent A) Increasing the current. B) Winding the coils closer together. C) Decreasing the number of loops. D) Using a stronger ferromagnetic core. Show Answer Correct Answer: C) Decreasing the number of loops. 46. How much current will heater rated 2.5KW draw, when connected to 250V supply A) 10A. B) 30A. C) 20A. D) 40A. Show Answer Correct Answer: A) 10A. 47. Which of these is NOT a necessary part of a circuit? A) Load. B) Wire. C) Battery. D) Switch. Show Answer Correct Answer: D) Switch. 48. Twelve identical wires of resistance 2 ohm, are joined to form a skeleton cube. The Current enters at one corner and leaves at the diagonally opposite corner find the total resistance between these corners A) 5ohm. B) 1ohm. C) 2.5ohm. D) 5/3ohm. Show Answer Correct Answer: D) 5/3ohm. 49. The temperature coefficient of resistance of an alloy used for making resistor is A) Small and positive. B) Small and negative. C) Large and positive. D) Large and negative. Show Answer Correct Answer: A) Small and positive. 50. 72 cells of internal resistance 5 Ohm and emf 2.0 volt are used to send current through an external circuit of resistance 10 Ohm. What is the maximum current in the circuit A) 24/35 Amp. B) 35/24 Amp. C) 12/35 Amp. D) 6/35 amp. Show Answer Correct Answer: C) 12/35 Amp. 51. What type of resistors do not obey Ohm's law? A) Ohmic resistors. B) Non-ohmic resistors. C) Metallic resistors. D) Alloy resistors. Show Answer Correct Answer: B) Non-ohmic resistors. 52. ..... did an experiment using kite and key during a thunderstrom. A) Galileo. B) Thomas Edison. C) Benjamin Franklin. D) None of the above. Show Answer Correct Answer: C) Benjamin Franklin. 53. Kirchhoff's rule can be used to find ..... and voltage in the circuit. A) Potential difference. B) Energy. C) Current. D) None of the above. Show Answer Correct Answer: C) Current. 54. Charging a cell phone is an example of A) Static Electricity. B) Current Electricity. C) All the above. D) None of the above. Show Answer Correct Answer: B) Current Electricity. 55. In resistor tolerance of silver is ..... A) 10%. B) 10$^{-1}$. C) 10. D) 10$^{-2}$. Show Answer Correct Answer: A) 10%. 56. What is a Parallel circuit? A) Has only one path. B) Has more than one path. C) Allows energy to travel through easily. D) Has only one light bulb. Show Answer Correct Answer: B) Has more than one path. 57. A metal wire is connected in the left gap and a semiconductor is connected in the right gap of meter-bridge. The balance is found on bridge wire. Both are heated so that change in resistance in them are same. Then the balancing point A) Will shift towards right. B) Will shift towards left. C) Depends on rise of temperatures. D) Will not shift. Show Answer Correct Answer: A) Will shift towards right. 58. If you add a second load to your series circuit, what will happen to the voltage in each load? A) Decrease. B) Increase. C) Stay the same. D) None of the above. Show Answer Correct Answer: B) Increase. 59. The movement of electrons from atom to atom in a line results in a flow of ..... A) Amperage. B) Electric current. C) Electromagnetic connectors. D) None of the above. Show Answer Correct Answer: B) Electric current. 60. Provides a constant flow of electricity A) Static Electricity. B) Current Electricity. C) All the above. D) None of the above. Show Answer Correct Answer: B) Current Electricity. 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