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 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An open circuit is broken and ..... electrons to flow. A) Allows. B) Does not allow. C) All the above. D) None of the above. Show Answer Correct Answer: B) Does not allow. 2. In the experiment of potentiometer, at the balanced point there is no current in A) In main circuit. B) Galvanometer circuit. C) Potentiometer circuit. D) Both main and galvanometer circuit. Show Answer Correct Answer: C) Potentiometer circuit. 3. Voltage is measured in ..... A) Volts. B) Watts. C) Coulombs. D) None of the above. Show Answer Correct Answer: A) Volts. 4. What is Ohm's Law formula? A) V = I * R. B) V = R / I. C) I = V + R. D) R = V-I. Show Answer Correct Answer: A) V = I * R. 5. All permanent magnets have two A) Magnetic poles. B) Magnetic needles. C) Magnetic fields. D) Magnetic charges. Show Answer Correct Answer: A) Magnetic poles. 6. How does current behave in a series circuit? A) It divides equally among all components. B) It only flows through the first component. C) It remains the same through all components. D) It varies from one component to another. Show Answer Correct Answer: C) It remains the same through all components. 7. In a circuit, what is the purpose of the switch? A) To prevent extra energy from building up in the circuit. B) To control the flow of energy through the circuit. C) To control the brightness of the light bulb. D) To prevent energy from going the wrong direction. Show Answer Correct Answer: B) To control the flow of energy through the circuit. 8. Involves circuits A) Static Electricity. B) Current Electricity. C) All the above. D) None of the above. Show Answer Correct Answer: B) Current Electricity. 9. Which of the following factor is affecting, the resistivity of a conductor? A) Nature. B) Area. C) Length. D) None of the above. Show Answer Correct Answer: A) Nature. 10. The opposition to electron movement A) Resistance. B) Static electricity. C) Voltage. D) Current. Show Answer Correct Answer: A) Resistance. 11. Kirchhoff's second law is in accordance with law of conservation of ..... A) Current. B) Charge. C) Energy. D) None of the above. Show Answer Correct Answer: C) Energy. 12. To reverse current direction in a motor the conducted current goes A) In the direction of rotation. B) Through the armature. C) Through the brushes to the commutator. D) Through the commutator to the armature. Show Answer Correct Answer: C) Through the brushes to the commutator. 13. Which component is used to store electrical energy in a circuit? A) Resistor. B) Inductor. C) Capacitor. D) Diode. Show Answer Correct Answer: C) Capacitor. 14. Five cylindrical wires are made of the same material. Their lengths and radii are:wire 1:length f, radius rwire 2:length f/4, radius r/2wire 3:length f/2, radius r/2wire 4:length f, radius r/2wire 5:length 5f, radius 2rRank the wires according to their resistances, least to greatest. A) 1, 2, 3, 4, 5. B) 5, 4, 3, 2, 1. C) 1 and 2 tie, then 5, 3, 4. D) 1, 3, 4, 2, 5. Show Answer Correct Answer: C) 1 and 2 tie, then 5, 3, 4. 15. What is the rate of flow of electric charges called? A) Electric potential. B) Electric conductance. C) Electric current. D) None of these. Show Answer Correct Answer: C) Electric current. 16. What does the voltage on a battery mean? A) The amount of energy given to the electrons. B) How tough it is for electrons to flow through it. C) The speed of electron flow through it. D) The amount of energy taken away from the electrons. Show Answer Correct Answer: A) The amount of energy given to the electrons. 17. A uniform wire has resistance 24 ohm. It is bent in the form of a circle. The effective resistance between the two end points on any diameter of the circle is ..... ohm. A) 6. B) 24. C) 12. D) 3. Show Answer Correct Answer: A) 6. 18. There is ..... when opposite electric charges come near to each other. A) Repulsion. B) Attraction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Attraction. 19. What is the unit of resistivity? A) Ohm$^{-1}$m. B) No unit. C) Ohm-m$^{-1}$. D) Ohm-m. Show Answer Correct Answer: D) Ohm-m. 20. A series circuit has A) Only one path for the electric charges to follow. B) Multiple paths for the electric charges to follow. C) All the above. D) None of the above. Show Answer Correct Answer: A) Only one path for the electric charges to follow. 21. A wire is broken in four equal parts. A circuit is formed by keeping the four wires together in parallel combination. The resistance of the packet in comparison to the resistance of the wire will be A) Equal. B) (1/16)th. C) (1/8)th. D) (1/4)th. Show Answer Correct Answer: D) (1/4)th. 22. If you decrease the voltage of a series circuit, what happens? A) Bulbs get brighter. B) Current increases. C) Current decreases. D) Electrons disappear. Show Answer Correct Answer: C) Current decreases. 23. If a compass is placed near an electromagnet what would happen if the switch is closed? A) The compass will do nothing. B) The wire will become an insulator. C) The compass needle will turn. D) A spark will jump from the nail. Show Answer Correct Answer: C) The compass needle will turn. 24. If you add a second battery to your series circuit, what will happen to the current in your circuit? A) Stay the same. B) Decrease. C) Disappears. D) Increase. Show Answer Correct Answer: D) Increase. 25. What is the function of every generator on Earth? A) Changing wind energy into electrical energy. B) Changing solar energy into electrical energy. C) Changing mechanical energy into electrical energy. D) Changing heat energy into electrical energy. Show Answer Correct Answer: C) Changing mechanical energy into electrical energy. 26. Which is the most commonly used conductor in electrical circuits? A) Gold. B) Copper. C) Silver. D) Aluminium. Show Answer Correct Answer: B) Copper. 27. Electric current comes from the movement or flow of ..... charged electrons around an electric circuit. A) Negatively. B) Neutral. C) Positively. D) Proton. Show Answer Correct Answer: A) Negatively. 28. What is the equation for Ohm's Law? A) I = V x R. B) I = V / R. C) V = I x R. D) R = V / I. Show Answer Correct Answer: B) I = V / R. 29. What is the unit of electric potential? A) Volt. B) Joule. C) Ampere. D) Coulomb. Show Answer Correct Answer: A) Volt. 30. A man standing near a fast moving train may fall. A) In the direction of train. B) Away from the train. C) Towards the train. D) On the same place. Show Answer Correct Answer: C) Towards the train. 31. Static electricity is a A) Steady flow of electric current. B) Current used in the house. C) Human-harness. D) Quick release of energy. Show Answer Correct Answer: D) Quick release of energy. 32. Build up of electrical charge on material-not flowing A) Static electricity. B) Current electriciity. C) Series circuit. D) Parallel circuit. Show Answer Correct Answer: A) Static electricity. 33. The ratio of masses of three wires 1:2:3 and that of their lengths is 3:2:1.If the wires are made of same material, the ratio of their resistances will be A) 27:6:1. B) 1:2:3. C) 9:4:1. D) 1:1:1. Show Answer Correct Answer: A) 27:6:1. 34. The current through each load connected in series ..... A) Will add up to the total current. B) Is the same everywhere. C) All the above. D) None of the above. Show Answer Correct Answer: B) Is the same everywhere. 35. A filament bulb of 500W, 100V it to be used in 230 V main supply. When a resistance R is connected in series, it works perfectly and bulb consumes 500W. The value of R is: A) 26 ohm. B) 46 ohm. C) 13 ohm. D) 230 ohm. Show Answer Correct Answer: A) 26 ohm. 36. Electrical potential is ..... A) Scalar quantity. B) Vector quantity. C) Both scalar and vector. D) Neither scalar nor vector. Show Answer Correct Answer: A) Scalar quantity. 37. To convert moving coil galvanometer in an ammeter a ..... is connected . A) A low resistance in parallel. B) A high resistance in parallel. C) A high resistance in series. D) A low resistance in series. Show Answer Correct Answer: A) A low resistance in parallel. 38. The flow of electricity goes from ..... to ..... in a battery. A) Negative to Negative. B) Positive to Negative. C) Positive to Positive. D) Negative to Positive. Show Answer Correct Answer: B) Positive to Negative. 39. Which best describes electromagnetism? A) The electrical component of a magnet. B) The flow of electric charges between two magnets. C) The interaction between electrical energy and magnetism. D) The flow of a magnetic field between electrons. Show Answer Correct Answer: C) The interaction between electrical energy and magnetism. 40. Harry replaces the switch in an electric circuit with a different object. The light bulb in the circuit does not light up. What can Harry conclude? A) The object is an insulator. B) The object is made of metal. C) The object is a conductor. D) The object is made of rubber. Show Answer Correct Answer: A) The object is an insulator. 41. Which device measures the potential difference in the circuit? A) Voltmetre. B) Ammeter. C) Galvanometer. D) None of the above. Show Answer Correct Answer: A) Voltmetre. 42. The SI Unit of electric Potential is the ..... A) Volt. B) Coulumb. C) Ampere. D) Current. Show Answer Correct Answer: A) Volt. 43. A wire of a certain material is stretched slowly by 10%. Its new resistance and specific resistance become respectively A) Both remain the same. B) 1.1 times, 1.1 times. C) 1.21 times, same. D) 1.1 times, same. Show Answer Correct Answer: C) 1.21 times, same. 44. What is the equation to calculate charge passing a point in a circuit? A) Q = I / t. B) Q = I x R. C) Q = V / I. D) Q = V x R. Show Answer Correct Answer: A) Q = I / t. 45. Which device measures the current in the circuit? A) Voltmetre. B) Ammeter. C) Galvanometer. D) None of the above. Show Answer Correct Answer: B) Ammeter. 46. A battery has an e.m.f of 6.0 V. When it is connected to an external resistor, the potential different is 2.6 V and the current is 0.6 A. What is the value of the internal resistance? A) 4.4 $\Omega$. B) 4.3 $\Omega$. C) 3.4 $\Omega$. D) 5.7 $\Omega$. Show Answer Correct Answer: D) 5.7 $\Omega$. 47. What is known as the difference between the earth's magnetic pole and its geographic pole? A) Geographic decline. B) Magnetic difference. C) Magnetic declination. D) Geographic increase. Show Answer Correct Answer: C) Magnetic declination. 48. You are given n identical resistors each of resistance r ohm. First, they are connected in such a way that the possible minimum value of resistance is obtained. Then they are connected in a way to get maximum possible resistance. The ratio of minimum and maximum resistance obtained in these ways is ..... A) N. B) $n^2$. C) $\frac{1}{n}$. D) $\frac{1}{n^2}$. Show Answer Correct Answer: D) $\frac{1}{n^2}$. 49. What does the switch do in a circuit? A) It supplies the power. B) It carries electricity. C) It opens and closes the circuit. D) It is an insulator. Show Answer Correct Answer: C) It opens and closes the circuit. 50. IF THE LENGTH OF A WIRE IN INCREASED TO 2 TIMES BY STRETCHING, WHAT WILL BE NEW RESISTANCE? A) 1/2 TIMES OF INITIAL RESISTANCE. B) 4 TIMES OF INITIAL RESISTANCE. C) 9 TIMES OF INITIAL RESISTANCE. D) 2 TIMES OF INITIAL RESISTANCE. Show Answer Correct Answer: B) 4 TIMES OF INITIAL RESISTANCE. 51. An example of a power source for current electricity is a battery. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 52. If you increase the voltage of the source in a parallel circuit, what happens? A) Current increases. B) Electrons disappear. C) Bulbs get dimmer. D) Current decreases. Show Answer Correct Answer: A) Current increases. 53. When static charge is built up on the bottom of your shoes from rubbing them on the carpet, this is caused by A) Magnatisim. B) Friction. C) Electronic system failure. D) Heat. Show Answer Correct Answer: B) Friction. 54. Mobility is the ..... A) Ratio of electric field to the drift velocity. B) Product of drift velocity and relaxation tme. C) Ratio of drift velocity to the electric field. D) None of the above. Show Answer Correct Answer: C) Ratio of drift velocity to the electric field. 55. The temperature coefficient of resistance of a wire is 0.00125 per degree celsius . At 300 K temperature its resistance is 1 ohm. The resistance of the wire will be 2 ohm at: A) 1400 K. B) 1154 K. C) 1100 K. D) 1127 K. Show Answer Correct Answer: C) 1100 K. 56. A voltmeter must have A) Low resistance so that it does affect the current through the main circuit. B) High resistance so that it does affect the current through the resistor. C) Low resistance so that it does affect the voltage across the resistor. D) None of the above. Show Answer Correct Answer: B) High resistance so that it does affect the current through the resistor. 57. How does electric current flow? A) From lower charge to higher charge. B) From higher charge to lower charge. C) All the above. D) None of the above. Show Answer Correct Answer: B) From higher charge to lower charge. 58. What happens to the terminal voltage when a larger current is drawn from a cell? A) Decreases. B) Becomes zero. C) Increases. D) Remains the same. Show Answer Correct Answer: A) Decreases. 59. A resource that can be replaced when needed. A) Exhaustible Energy. B) Renewable Energy. C) Nonrenewable Energy. D) Fossil Fuels. Show Answer Correct Answer: B) Renewable Energy. 60. The inverse of conductivity is called A) Mobility. B) Resistivity. C) Coercivity. D) Permittivity. Show Answer Correct Answer: B) Resistivity. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books