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 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 21 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A constant voltage is applied between two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if A) Both the length and radius of the wire are halved. B) Both the length and radius of the wire are doubled. C) The radius of the wire is doubled. D) The length of the wire is doubled. Show Answer Correct Answer: B) Both the length and radius of the wire are doubled. 2. Electromotive force (emf) is measured in units of ..... A) Ampere (A). B) Newton (N). C) Coulomb (C). D) Volt (V). Show Answer Correct Answer: D) Volt (V). 3. Which items are needed to create an electromagnet? A) A magnet, a wire, and a battery. B) A magnet, a metal bar, and a battery. C) A magnet, a metal bar, and a wire. D) A metal bar, a wire, and a batter. Show Answer Correct Answer: D) A metal bar, a wire, and a batter. 4. Keeping the potential difference constant, the resistance of the circuit is halved, the current will become ..... A) Four times. B) One-third. C) Half. D) Double. Show Answer Correct Answer: D) Double. 5. What is the unit of drift velocity? A) A m$^{2}$s. B) M$^{2}$ V$^{-1}$ S$^{-1}$. C) M V. D) Vm$^{-1}$. Show Answer Correct Answer: B) M$^{2}$ V$^{-1}$ S$^{-1}$. 6. In a magnet the opposite poles will ..... A) Attract. B) Repel. C) All the above. D) None of the above. Show Answer Correct Answer: A) Attract. 7. What is internal resistance of 2.0V cell which gives a current 0.1A through resistance of 10ohm A) 10 ohm. B) 20 ohm. C) 30 ohm. D) 40 ohm. Show Answer Correct Answer: A) 10 ohm. 8. What is the power consumed by a lamp whose current is 6 A and the voltage across it is 120 V? A) 10 W. B) 720 W. C) 120 W. D) 16 W. Show Answer Correct Answer: B) 720 W. 9. Fill in the Blank:Opposite charges will ..... one another. A) Repel. B) Attract. C) Neutralize. D) Have no effect on. Show Answer Correct Answer: B) Attract. 10. An ideal voltmeter in physics has ..... A) An infinite resistance. B) Zero resistance. C) A negligible internal resistance. D) An easily readable scale. Show Answer Correct Answer: A) An infinite resistance. 11. If there is a gap or break in in the electrical flow-there is no electricity it is called A) Discharge. B) Short circuit. C) Open circuit. D) Closed circuit. Show Answer Correct Answer: C) Open circuit. 12. A piece of copper and another of germanium are cooled from room temperature to 77 K. The resistance of: A) Copper decreases and germanium increases. B) Copper increases and germanium decreases. C) Each of them increases. D) Each of them decreases. Show Answer Correct Answer: A) Copper decreases and germanium increases. 13. What is the effect of adding more resistors in parallel on the total resistance? A) The total resistance remains the same. B) The total resistance fluctuates randomly. C) The total resistance increases. D) The total resistance decreases. Show Answer Correct Answer: D) The total resistance decreases. 14. The cells that cannot be recharged are called A) Primary cell. B) Secondary cells. C) Normal cells. D) None of the above. Show Answer Correct Answer: A) Primary cell. 15. True or FalseLike charges repel A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. Power is measured in what units? A) Watts. B) Ohms. C) Volts. D) Amperes. Show Answer Correct Answer: A) Watts. 17. Which examples below describes naturally-occurring electricity? A) Getting shocked when plugging in a vacuum cleaner. B) Quick release of energy. C) Current electricity. D) Battery. Show Answer Correct Answer: B) Quick release of energy. 18. Which material would be a good conductor? A) Cardboard. B) Paper. C) Metal. D) Wood. Show Answer Correct Answer: C) Metal. 19. How many Volts would it take to push 1 Amp through a resistance of 1 Ohm A) 10 volts. B) 48 volts. C) 5 volts. D) 1 volt. Show Answer Correct Answer: D) 1 volt. 20. Wires C and D are made from the same material. Wire C has a resistance of $48\Omega$ A) 24 $\Omega$. B) 12 $\Omega$. C) 48 $\Omega$. D) 96 $\Omega$. Show Answer Correct Answer: D) 96 $\Omega$. 21. Which of the following materials is not a conductor? A) Steel. B) Ionic solution. C) Wire wool. D) Plastic. Show Answer Correct Answer: D) Plastic. 22. What does the resistance of a wire tell you? A) The amount of energy taken away from the electrons. B) The amount of energy given to the electrons. C) How tough it is for electrons to flow through it. D) The speed of electron flow through it. Show Answer Correct Answer: C) How tough it is for electrons to flow through it. 23. When current running through a wire is placed in the field of a permanent magnet, A) Electrical energy is transformed into sound. B) Solar energy is transformed into mechanical energy. C) Electrical energy is transformed into mechanical energy. D) Solar energy is transformed into light. Show Answer Correct Answer: C) Electrical energy is transformed into mechanical energy. 24. The part of a circuit that helps maintain a current flow by maintaining a p.d. A) Battery. B) Ammeter. C) Switch. D) Resistance. Show Answer Correct Answer: A) Battery. 25. In a meter bridge experiment the ratio of left gap resistance to right gap resistance is 2:3. The balance point from left is A) 20cm. B) 50cm. C) 40cm. D) 60cm. Show Answer Correct Answer: C) 40cm. 26. Protons have a negative charge and electrons have a positive charge. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 27. ..... provide low resistance so electrons move easily. A) Conductors. B) Insulators. C) All the above. D) None of the above. Show Answer Correct Answer: A) Conductors. 28. If current through a cross-section varies with time as i = (a + bt) where a and b are constant, then average current through the cross-section in time t$_{1}$ = 0 to t$_{2}$ = 2 sec is A) (a + b). B) (a + 2b). C) (2a + b). D) (a + $\frac{b}{2}$. Show Answer Correct Answer: A) (a + b). 29. Which of the following materials is commonly used as a core in an electromagnet to enhance its magnetic field? A) Iron. B) Wood. C) Glass. D) Plastic. Show Answer Correct Answer: A) Iron. 30. Measured in ohms. A) Voltage. B) Current. C) Resistance. D) None of the above. Show Answer Correct Answer: C) Resistance. 31. 1 ampere = 1 coulumb per ..... A) Minute. B) Time. C) Second. D) Hour. Show Answer Correct Answer: C) Second. 32. Two wires of equal length and equal diameter and having resistivities $\rho_1$ $\rho_2$ A) $\sqrt{\rho_1\rho_2}$. B) $\frac{\rho_1+\rho_2}{2}$. C) $\rho_1+\rho_2$. D) $\frac{\rho_1\rho_2}{\rho_1+\rho_2}$. Show Answer Correct Answer: B) $\frac{\rho_1+\rho_2}{2}$. 33. An example of an electromagnet A) Motor. B) Water bottle. C) Glass. D) Paper. Show Answer Correct Answer: A) Motor. 34. When 2 resistances P and Q are kept in the left and right gaps of a meter bridge, the null point is obtained at 60 cm. If P is shunted by a resistance equal to half of its value, the shift in null point is A) 10 cm to the left. B) 10cm to the right. C) 26.7 cm to the left. D) 26.7 cm to right. Show Answer Correct Answer: C) 26.7 cm to the left. 35. A given copper wire is stretched to reduce its diameter to half its previous value. What would be its new resistance? A) 1/16 OHM. B) NO CHANGE. C) 16 R. D) 4 OHM. Show Answer Correct Answer: C) 16 R. 36. If the potential difference across a resistor is doubled: A) Only the resistance is halved. B) Only the current is doubled. C) Only the current is halved. D) Only the resistance is doubled. Show Answer Correct Answer: B) Only the current is doubled. 37. Fill in the blank: ..... electricity exists when charges are able to freely flow. A) Static. B) Current. C) Discharge. D) Friction. Show Answer Correct Answer: B) Current. 38. The ..... resistance of a wire, the better it conducts electricity. A) More. B) Less. C) All the above. D) None of the above. Show Answer Correct Answer: B) Less. 39. Velocity of fluid increases where the pressure is: A) High. B) Low. C) Constant. D) Zero. Show Answer Correct Answer: B) Low. 40. Which of these forces works only by combining electric and magnetic forces? A) Magnetic. B) Electric. C) Electromagnetism. D) None of the above. Show Answer Correct Answer: C) Electromagnetism. 41. Which statement best describes a difference between static electricity and current electricity? A) Static electricity is positive energy while current electricity is negative energy. B) Static electricity is natural energy while current electricity is human-harnessed energy. C) Static electricity is created energy while current electricity is spent energy. D) Static electricity is human-harnessed energy while current electricity is natural energy. Show Answer Correct Answer: B) Static electricity is natural energy while current electricity is human-harnessed energy. 42. Any type of object through which an electric current cannot flow A) Conductor. B) Insulator. C) All the above. D) None of the above. Show Answer Correct Answer: B) Insulator. 43. In a circuit, if the voltage is increased and the resistance stays the same, current will ..... A) Increase, because voltage and current are directly proportional. B) Decrease, because voltage and current are directly proportional. C) Decrease, because voltage and current are indirectly proportional. D) Increase, because voltage and current are indirectly proportional. Show Answer Correct Answer: A) Increase, because voltage and current are directly proportional. 44. How much charge must pass by a point in 10 s for the current to be 0.50 A? A) 2, 0C. B) 0, 05C. C) 5, 0C. D) 20C. Show Answer Correct Answer: C) 5, 0C. 45. Complete the sentence:An ammeter is a device that measures A) Charge. B) Resistance. C) Voltage. D) Current. Show Answer Correct Answer: D) Current. 46. When a potential difference V is applied accross conductor at a temprature T, the drift velocity of electron is propotional to A) V. B) $\sqrt[]{V}$. C) $\sqrt[]{T}$. D) T. Show Answer Correct Answer: A) V. 47. When a metal conductor connected to left gap of a meter bridge is heated, the balancing point A) Remains unchanged. B) Shifts towards right. C) Remains at zero. D) Shifts towards left. Show Answer Correct Answer: B) Shifts towards right. 48. The ..... is the energy that flows from the battery, through the wire in it's path through the circuit. A) Electric Current. B) Insulator. C) Electromagnet. D) Conductor. Show Answer Correct Answer: A) Electric Current. 49. Rubber is a good insulator. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 50. What is the power dissipated by a 32 ohm resistor with a current of 1.4A flowing through it? A) 57.8 W. B) 22.4 W. C) 35.2 W. D) 48.6 W. Show Answer Correct Answer: B) 22.4 W. 51. What needs to happen for static electricity to occur? A) A build-up of electrons on a surface. B) A constant flow of water. C) A reduction in air pressure. D) None of the above. Show Answer Correct Answer: A) A build-up of electrons on a surface. 52. Which is NOT true of a series circuit A) One light bulb can be broken and other lights will still work. B) All loads are a single loop. C) Adding more loads will lessen the current in the loop. D) None of the above. Show Answer Correct Answer: A) One light bulb can be broken and other lights will still work. 53. What is the term for the work done in bringing a unit positive charge from infinity to a point? A) Resistance. B) Potential. C) Current. D) Voltage. Show Answer Correct Answer: B) Potential. 54. True or False, Lighting is a form of static electricity. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 55. If an electric current is passed through a nerve, the man A) Is excited. B) Becomes insensitive to pain. C) Weeps. D) Laughs. Show Answer Correct Answer: A) Is excited. 56. Atoms are made up of all of the following except A) Neutrons. B) Magnets. C) Electrons. D) Protons. Show Answer Correct Answer: B) Magnets. 57. True or False:Conductors allow electrons to pass through easily. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 58. What would happen to the current in a circuit if the voltage decreased? (V=IR) A) Increase. B) Decrease. C) Remain the same. D) None of the above. Show Answer Correct Answer: B) Decrease. 59. An ammeter is to be constructed which can read currents up to 2A. If the coil has a resistance of 50 $\Omega$ and takes 100 mA for full-scale deflection, what should be the resistance of the shunt used? A) 25 $\Omega$. B) 0.25 $\Omega$. C) 5 $\Omega$. D) 2.5 $\Omega$. Show Answer Correct Answer: D) 2.5 $\Omega$. 60. An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry? A) 1.6 A going in. B) 6.8 A going out. C) 6.8 A going in. D) 1.6 A going out. Show Answer Correct Answer: D) 1.6 A going out. ← 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 7Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books