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 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The property of a conductor by which it obstructs the flow of current is known as ..... of the conductor A) Voltage. B) Resistance. C) Power. D) Conductivity. Show Answer Correct Answer: B) Resistance. 2. ..... allows electricity to flow. A) A conductor. B) An insulator. C) A magnet. D) None of the above. Show Answer Correct Answer: A) A conductor. 3. What does the current in a wire tell you? A) The speed of electron flow through it. B) The amount of energy given to the electrons. C) The amount of energy taken away from the electrons. D) How tough it is for electrons to flow through it. Show Answer Correct Answer: A) The speed of electron flow through it. 4. True or False:A switch turns a circuit on or off. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. Resistance in an electric wire is A) Directly proportional to length of wire. B) Inversely proportional to length of wire. C) All the above. D) None of the above. Show Answer Correct Answer: A) Directly proportional to length of wire. 6. As earth's magnetic poles move what happens to the magnetic declination of a given location A) It will always remain constant. B) It will change. C) It will return to zero. D) It will always double. Show Answer Correct Answer: B) It will change. 7. What makes an electromagnet stronger? A) Greater number of loops. B) Smaller number of loops. C) Decreasing the current. D) Decreasing the voltage. Show Answer Correct Answer: A) Greater number of loops. 8. The mobility of free electrons in a metal is proportional to A) $\frac{m}{e\tau}$. B) $\frac{m}{e}\tau$. C) $\frac{e}{m\tau}$. D) $\frac{e}{m}\tau$. Show Answer Correct Answer: D) $\frac{e}{m}\tau$. 9. What is the power consumed by a lamp whose current is 6.0 A and the lamp has a resistance of 4.0 ohms? A) 120 W. B) 144 W. C) 1.5 W. D) 24 W. Show Answer Correct Answer: B) 144 W. 10. When seen from below, the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing. Select correct statement about the directions of its angular velocity and angular acceleration. A) Angular velocity upwards, angular acceleration downwards. B) Angular velocity downwards, angular acceleration upwards. C) Both angular velocity and angular acceleration upwards. D) Both angular velocity and angular acceleration downwards. Show Answer Correct Answer: A) Angular velocity upwards, angular acceleration downwards. 11. On increasing the temperature of a conductor, its resistance increases because the A) Relaxation time remains constant. B) Relaxation time increases. C) Electron density decreases. D) Relaxation time decreases. Show Answer Correct Answer: D) Relaxation time decreases. 12. V=IR is representation of what? A) Ohm's law. B) Coulomb's law. C) Newton's law. D) None of the above. Show Answer Correct Answer: A) Ohm's law. 13. The terminal potential of a cell is greater than its emf when it is A) Being charged. B) Being discharged. C) Open circuit. D) Being either charged or discharged. Show Answer Correct Answer: A) Being charged. 14. What boosts the voltage of an electric current? A) Step-up transformer. B) Transformer. C) Step-down transformer. D) Wires. Show Answer Correct Answer: A) Step-up transformer. 15. What does a switch do for a circuit? A) It does not help the circuit. B) It keeps the circuit closed. C) It keeps the circuit on. D) It makes the circuit opened or closed. Show Answer Correct Answer: D) It makes the circuit opened or closed. 16. An arc lamp operates at 80V, 10A. Suggest a method to use it with a 240 V d.c. source. Calculate the value of the electric component required for this purpose A) 16 Ohm. B) 60 ohm. C) 6 0hm. D) None of the above. Show Answer Correct Answer: A) 16 Ohm. 17. In Meter Bridge when P is kept in left gap, Q is kept in right gap, the balancing length is 40cm. If Q is shunted by 10, the balance point shifts by 10cm. Resistance Q is ..... A) 6 ohm. B) 8 ohm. C) 5 ohm. D) 10 ohm. Show Answer Correct Answer: C) 5 ohm. 18. What is the purpose of the rheostat in the electric circuit used to verify Ohm's law? A) To measure the current. B) To measure the potential difference. C) To adjust the current. D) To adjust the resistance. Show Answer Correct Answer: D) To adjust the resistance. 19. Calculate the amount of charge that would flow in 1 hour through the element of an electric bulb drawing a current of 0.2 A. [Use I = Q/t] A) 320 C. B) 720 C. C) 300 C. D) 700 C. Show Answer Correct Answer: B) 720 C. 20. Which best describes a series circuit? A) It has two light bulbs. B) The same current flows through both light bulbs. C) It uses a single battery. D) The current is divided between the light bulbs. Show Answer Correct Answer: B) The same current flows through both light bulbs. 21. Sometimes the north and south poles of atoms in a material will line up. What is the term for the region where this occurs? A) Ferromagnetic. B) Magnetic pole. C) Magnetic field. D) Domain. Show Answer Correct Answer: D) Domain. 22. What is the main difference between conductors and insulators? A) Insulators are positively charged and conductors are negatively charged. B) Electrical currents move through conductors better than insulators. C) Electrical currents move through insulators better than conductors. D) Conductors have a neutral charge and insulators have a negative charge. Show Answer Correct Answer: B) Electrical currents move through conductors better than insulators. 23. The amount of energy in the circuit, the push. A) Voltage. B) Current. C) Resistance. D) None of the above. Show Answer Correct Answer: A) Voltage. 24. Which of these objects is an insulator? A) Copper Wire. B) Paper Clip. C) Steel Pole. D) Rubber Gloves. Show Answer Correct Answer: D) Rubber Gloves. 25. Which of the following is a good choice during a thunder storm. A) Stand under a tall tree so the lightning strikes the tree instead of you. B) Use an umbrella to stay dry since water conducts electricity. C) Lay in a low ditch so that you are not tall. D) Use your landline phone instead of your cellphone if you need to make a phone call. Show Answer Correct Answer: C) Lay in a low ditch so that you are not tall. 26. When a glass rod is rubbed on a silk cloth, the glass rod acqires ..... charge A) Electron. B) Negative. C) Positive. D) Nutral. Show Answer Correct Answer: C) Positive. 27. Expression for lost volts is ..... A) V = I R. B) V = I r. C) V = R r. D) None of the above. Show Answer Correct Answer: B) V = I r. 28. As the resistance of a circuit increases, the current will ..... A) Increase. B) Stay the same. C) Magnify. D) Decrease. Show Answer Correct Answer: D) Decrease. 29. What happens to voltage in a circuit if the current remains the same and the resistance is decreased? A) Voltage will increase. B) Voltage will decrease. C) Voltage will remain unchanged. D) None of the above. Show Answer Correct Answer: A) Voltage will increase. 30. What does power mean? A) Joules transferred per second. B) Speed of electrons. C) Electron flow per second. D) Electron energy. Show Answer Correct Answer: A) Joules transferred per second. 31. Thermocouple is an arrangement of two different metals a A) To produce more heat. B) To convert electric energy in to heat energy. C) To convert heat energy into chemical energy. D) To convert heat energy in to electrical energy. Show Answer Correct Answer: D) To convert heat energy in to electrical energy. 32. A current of 0.3 A is passed through a lamp for 2 minutes using a 6-V power supply. The energydissipated by this lamp during the 2 minutes is A) 1.8 J. B) 216 J. C) 20 J. D) 12 J. Show Answer Correct Answer: B) 216 J. 33. Electrical devices have ..... electric resistance, while good conductors have ..... electric resistance. A) High, low. B) Low, high. C) All the above. D) None of the above. Show Answer Correct Answer: A) High, low. 34. A flow of electrons through a conductor is called: A) A spark. B) A river. C) An electron flow. D) A current. Show Answer Correct Answer: D) A current. 35. Which of the following have the highest conductivity? A) Nichrome. B) Silver. C) Aluminium. D) Copper. Show Answer Correct Answer: B) Silver. 36. ..... electricity is the buildup of charged particles in a material. A) Static. B) Circuit. C) Charge. D) Current. Show Answer Correct Answer: A) Static. 37. A kettle requires a current of 2.1 A and takes 3 minutes to boil a litre of water. Calculate the charge through the wire in this time? A) 378 C. B) 0.7 C. C) 6.3 C. D) 6.3 Q. Show Answer Correct Answer: A) 378 C. 38. What measures current? A) Electroscope. B) Meter. C) Ammeter. D) All of the above. Show Answer Correct Answer: C) Ammeter. 39. What is electromotive force? A) The work done in driving a unit charge around a complete circuit. B) The work done in driving a unit charge through the component. C) All the above. D) None of the above. Show Answer Correct Answer: A) The work done in driving a unit charge around a complete circuit. 40. When electrons all spin in the same direction, they create an invisible force known as A) Motor. B) Magnetism. C) Electrons. D) Electricity. Show Answer Correct Answer: B) Magnetism. 41. What is a permanent magnet? A) Has magnetic properties for a long time. B) Is not magnetized. C) Does not have a north or south pole. D) Is magnetized by an electric current. Show Answer Correct Answer: A) Has magnetic properties for a long time. 42. Name the factors decide internal resistance of a cell A) 3. nature of the electrodes. B) 1. temperature. C) 4.distance between the electrodes. D) 1, 2, 3 & 4. E) 2. nature of the electrolyte. Show Answer Correct Answer: D) 1, 2, 3 & 4. 43. Which of the following materials is commonly used as a core in electromagnets? A) Iron. B) Copper. C) Plastic. D) Aluminum. Show Answer Correct Answer: A) Iron. 44. An incomplete or broken circuit. A) Closed Circuit. B) Open Circuit. C) Cracked bulb Circuit. D) None of the above. Show Answer Correct Answer: B) Open Circuit. 45. In a series circuit, if one component fails, what happens to the rest of the circuit? A) The rest of the circuit continues to work. B) The entire circuit stops working. C) The voltage increases. D) The current increases. Show Answer Correct Answer: B) The entire circuit stops working. 46. In a simple circuit, what is the role of a resistor? A) To decrease the voltage. B) To store electrical energy. C) To increase the current flow. D) To limit the current flow. Show Answer Correct Answer: D) To limit the current flow. 47. To have a complete circuit, the path must be ..... A) Open. B) Closed. C) All the above. D) None of the above. Show Answer Correct Answer: B) Closed. 48. How is a voltmeter connected in the circuit to measure the potential difference between two points? A) Series. B) Parallel. C) According to the situation either series or parallel. D) None. Show Answer Correct Answer: B) Parallel. 49. A group of lights are connected in a parallel circuit. One of the lights is removed. The rest of the lights will A) Get brighter. B) Go out. C) Not change. D) Get dimmer. Show Answer Correct Answer: C) Not change. 50. House hold circuits are connected in A) Parallel. B) Series. C) Both series and parallel. D) None of these. Show Answer Correct Answer: A) Parallel. 51. A wire of uniform cross-section, A length L and resistance R is cut into two equal parts. The resistivity of each part will be A) One fourth. B) Halved. C) Remains the same. D) Doubled. Show Answer Correct Answer: C) Remains the same. 52. Which of follwing charactristics of electrons determines the current in the conductor A) Thermal velocity of electrons alone. B) Drift velocity of electrons alone. C) Tboth drift velocity and thermal velocity of electrons alone. D) Niether drift velocity and thermal velocity. Show Answer Correct Answer: B) Drift velocity of electrons alone. 53. Kirchoff's first law is a consequence of conservation of A) Current. B) Power. C) Energy. D) Charges. Show Answer Correct Answer: D) Charges. 54. Like poles on a permanent magnet will A) Point in the same direction. B) Repel each other. C) Always interact. D) Attract each other. Show Answer Correct Answer: B) Repel each other. 55. What is immaterial for an electric fuse? A) Its radius. B) Current flowing through it. C) Its length. D) Its specific resistance. Show Answer Correct Answer: C) Its length. 56. What happens when you pull a bulb out of a series circuit A) Electricity will find a different path rest of bulbs light. B) The electricity will flow around and the other bulbs light up. C) It will create a gap or open circuit-no bulbs light up. D) The bulb will still light either way. Show Answer Correct Answer: C) It will create a gap or open circuit-no bulbs light up. 57. Two conductors are made of the same material and have the same length. Conductor A is asolid wire of diameter 1 m. Conductor B is a hollow tube of inside diameter 1 m and outsidediameter 2 m. The ratio of their resistance, , is:$R_A$ $R_B$ A) $\sqrt{2}$. B) 2. C) 1. D) 3. Show Answer Correct Answer: D) 3. 58. True or False:A battery is used to power a flashlight circuit. When the battery no longer works, it is because it has run out of charge. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 59. True or False:Charge is consumed as it moves through the energy-transforming devices of the external circuit. For instance, the amount of charge entering a light bulb in a second is less than that which exits the light bulb in a second. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 60. SI Unit of Electric current A) Ampara. B) Ampaire. C) Ampare. D) Ampere. Show Answer Correct Answer: D) Ampere. ← 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 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 8Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books