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 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 20 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If q=(8t$^{2}$+2t+1 )$\mu$C Find Instantaneous Current at t= 2 sec and average Current at 0 to 2 sec A) 4$\mu$A, 1$\mu$A. B) 34$\mu$A, 18$\mu$A. C) 3$\mu$A, 18$\mu$A. D) 4$\mu$A, 8$\mu$A. Show Answer Correct Answer: B) 34$\mu$A, 18$\mu$A. 2. Every battery has 4 electrodes A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 3. What is the potential difference across resistors in parallel? A) Same across all. B) Depends on current. C) Different for each. D) Zero. Show Answer Correct Answer: A) Same across all. 4. A(n) is coil of wire with a current running through it. If you wrap the coil around a ferromagnetic material, it becomes a(n) . A) Electromagnet, solenoid. B) Generator, motor. C) Solenoid, electromagnet. D) Motor, generator. Show Answer Correct Answer: C) Solenoid, electromagnet. 5. ..... are good conductors of electricity. A) Insulators. B) Metals. C) Non metals. D) None of the above. Show Answer Correct Answer: B) Metals. 6. Ohm is Equivalent to? A) Volt/coulomb. B) Coulomb/volt. C) Ampere/volt. D) Volt/ampere. Show Answer Correct Answer: D) Volt/ampere. 7. In a simple voltaic cell ..... and ..... metal are used as electrodes. A) Cupper and silver. B) Copper and zinc. C) Zinc and sulphuric acid. D) Copper and sulphuric acid. Show Answer Correct Answer: B) Copper and zinc. 8. The thin wire inside alight bulb is called the filament. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. A wire of resistance R is stretched to n times of its original length. The resistance of stretched wire would be- A) NR. B) N$^{2}$R. C) R/n$^{2}$. D) R/n. Show Answer Correct Answer: B) N$^{2}$R. 10. How are electromagnets different from regular magnets? A) Their strength can be changed. B) They can be turned on and off. C) Their polarity can be reversed. D) All choices are correct. Show Answer Correct Answer: D) All choices are correct. 11. What is the unit for voltage? A) Volts. B) Ohms. C) Watts. D) Amperes (amps). Show Answer Correct Answer: A) Volts. 12. This unit tells you how much energy is carried by each charged particle. A) Ohms ($\Omega$). B) Volts (V). C) Joules (J). D) Amperes (A). Show Answer Correct Answer: B) Volts (V). 13. Materials that do not obey ohm's law are said to be ..... material. A) Non-Ohmic. B) Ohmic. C) Conductor. D) Zero. Show Answer Correct Answer: A) Non-Ohmic. 14. A current of 3.0 A flows in a wire connected to the terminals of a battery.Calculate the total electric charge which passes through the circuit in 5.0 minutes. A) 15 C. B) 0.60 C. C) 0.10 C. D) 900 C. Show Answer Correct Answer: D) 900 C. 15. What is the term for the resistance offered by the electrolyte inside a cell? A) Electromotive resistance. B) Terminal resistance. C) External resistance. D) Internal resistance. Show Answer Correct Answer: D) Internal resistance. 16. A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are: A) Drift speed only. B) Current, electric field and drift speed. C) Current and drift speed. D) Current only. Show Answer Correct Answer: D) Current only. 17. To supply maximum current, cells should be arranged in A) Series. B) Parallel. C) Mixed grouping. D) Depends on the internal and external resistance. Show Answer Correct Answer: A) Series. 18. Zero is never the first significant digit A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 19. Which of the following produces current to an electrical circuit? A) Wire. B) Switch. C) Light bulb. D) Battery. Show Answer Correct Answer: D) Battery. 20. This allows only one path for the electrons to flow: A) Conductor. B) Insulator. C) Parallel circuit. D) Series circuit. Show Answer Correct Answer: D) Series circuit. 21. Which of the following is NOT required for a circuit to be complete. A) Power Source. B) Conductor. C) Load. D) Switch. Show Answer Correct Answer: D) Switch. 22. The loop that electricity follows A) Static. B) Circuit. C) Terminal. D) Electrons. Show Answer Correct Answer: B) Circuit. 23. I allow electricity to run through me easily. A) Conductor. B) Electric circuit. C) Fuse. D) Insulator. Show Answer Correct Answer: A) Conductor. 24. An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, power consumed will be ..... [Use P = V$^{2}$/R] A) 50 W. B) 25 W. C) 75 W. D) 100 W. Show Answer Correct Answer: B) 25 W. 25. What is the primary function of a resistor in an electrical circuit? A) To store electrical energy. B) To decrease the voltage. C) To increase the current. D) To limit the current. Show Answer Correct Answer: D) To limit the current. 26. In a series circuit, if one receiver is disconnected, nothing will work. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 27. How are magnetic fields produced in an electromagnet? A) Iron filings are sprinkled around the iron core. B) The iron core was placed next to an existing magnet. C) An electric current is being sent through a wire. D) A battery is placed next to the iron core. Show Answer Correct Answer: C) An electric current is being sent through a wire. 28. Place the following events in sequence:A) Voltage is increased by a transformer; B) Voltage is decreased by a transformer; C) Electrical current enters your home A) A, B, C. B) B, A, C. C) B, C, A. D) A, C, B. Show Answer Correct Answer: A) A, B, C. 29. Why does opening a switch in an electric circuit stop the flow of current? A) Charges can't flow through a broken path. B) The magnetic domain is interrupted. C) The magnetic field disappears. D) None of the above. Show Answer Correct Answer: A) Charges can't flow through a broken path. 30. If R1 and R2 are the filament resistances of 200 W and a 100 W bulb respectively both designed to run at the same voltage, then A) R1 is four times of R2. B) R2 is two times of R1. C) R1 is two times of R2. D) R2 is four times of R1. Show Answer Correct Answer: B) R2 is two times of R1. 31. What is the value of the resistance of the resistor in ohms with color code Brown Black Yellow (ignore the tolerance) A) 1 k. B) 1000 k. C) 100 k. D) 10 k. Show Answer Correct Answer: C) 100 k. 32. Can happen by accident and is difficult to control A) Static Electricity. B) Current Electricity. C) All the above. D) None of the above. Show Answer Correct Answer: A) Static Electricity. 33. What is the resistance of a conductor? A) The ratio of voltage to current. B) The ratio of current to voltage. C) The product of voltage and current. D) The sum of voltage and current. Show Answer Correct Answer: A) The ratio of voltage to current. 34. Device used to measure electric current is A) Voltmeter. B) Ammeter. C) Barometer. D) Odometer. Show Answer Correct Answer: B) Ammeter. 35. The flow of current electricity that always goes in one direction is ..... A) Alternating Current. B) Direct Current. C) Solar cells. D) Wall socket. Show Answer Correct Answer: B) Direct Current. 36. What type of metal are most wires made of? A) Silver. B) Copper. C) Steel. D) None of the above. Show Answer Correct Answer: B) Copper. 37. Energy stored in the earth in the form of heat. A) WIND ENERGY. B) NUCLEAR ENERGY. C) GEOTHERMAL. D) SOLAR ENERGY. Show Answer Correct Answer: C) GEOTHERMAL. 38. If the lights are on, the circuit is A) Closed. B) Open. C) All the above. D) None of the above. Show Answer Correct Answer: A) Closed. 39. A wire connected to a power supplyof 230 V has power dissipation P$_{1}$.Suppose the wire is cut into two equalpieces and connected parallel to thesame power supply. In this case powerdissipation is P$_{2}$ . The ratio P$_{2}$/P$_{1}$is A) 1. B) 3. C) 4. D) 2. Show Answer Correct Answer: C) 4. 40. A natural fuel (coal, oil, or gas) formed in the geological past from the remains of living organisms. A) SOLAR ENERGY. B) FUEL CELL. C) FOSSIL FUEL. D) WIND ENERGY. Show Answer Correct Answer: C) FOSSIL FUEL. 41. The dimensions of mobility of charge carriers are A) [M$^{-2}$T$^{2}$A]. B) [M$^{-1}$T$^{2}$A]. C) [M$^{-1}$T$^{3}$A]. D) [M$^{-1}$T$^{3}$A$^{-1}$]. Show Answer Correct Answer: B) [M$^{-1}$T$^{2}$A]. 42. What is the term for the flow of charge in a circuit? A) Power. B) Voltage. C) Current. D) Resistance. Show Answer Correct Answer: C) Current. 43. Voltage is a form of: A) Kinetic energy. B) Potential energy. C) Both Potential and Kinetic energy. D) None of the above. Show Answer Correct Answer: B) Potential energy. 44. An example of a good conductor is A) Copper. B) Sand. C) Plastic. D) None of the above. Show Answer Correct Answer: A) Copper. 45. What electrical charge to electrons carry? A) Positive. B) Negative. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Negative. 46. Resistance of conductor depends on its A) Length. B) Area of cross section. C) Nature of material. D) All of these. Show Answer Correct Answer: D) All of these. 47. Wheatstone is one type of ..... bridge A) AC. B) DC. C) ADC. D) DAC. Show Answer Correct Answer: B) DC. 48. 8 identical cells, each of emf E and internal resistance r, are connected in series.If polarity of two cell is reversed, the total internal resistance in the circuit wil be A) 4r. B) 8r. C) 2r. D) 6r. Show Answer Correct Answer: B) 8r. 49. In a metre bridge experiment, resistance box (withR = 2ohm) is connected in the left gap andthe unknown resistance S in the right gap. If balancing length be 40 cm, calculate value of S. A) 4 ohm. B) 2 ohm. C) 2.5 ohm. D) 3 ohm. Show Answer Correct Answer: D) 3 ohm. 50. A wire of length L is drawn such that its diameter is reduced to half of its original diameter. If the resistance of the wire were 10 ohm, its new resistance would be. A) 120 ohm. B) 60 ohm. C) 40 ohm. D) 160 ohm. Show Answer Correct Answer: D) 160 ohm. 51. If voltage is decreased, current will ..... A) Increase. B) Decrease. C) Stay the same. D) None of the above. Show Answer Correct Answer: B) Decrease. 52. What is the unit of specific resistance? A) Watt x meter. B) Volt x meter. C) Ampere x meter. D) Ohm x meter. Show Answer Correct Answer: D) Ohm x meter. 53. If the charge is 60 Coulombs and the time is 15 seconds, what is the current? A) 45 Amps. B) 4 Amps. C) 15 Amps. D) 75 Amps. Show Answer Correct Answer: B) 4 Amps. 54. The most energy efficient option is A) CFL lights. B) LED lights. C) Ordinary lights. D) None of the above. Show Answer Correct Answer: B) LED lights. 55. What is the effect of increasing the resistance in a circuit on the current flow, assuming the voltage remains constant? A) The current flow becomes zero. B) The current flow remains the same. C) The current flow decreases. D) The current flow increases. Show Answer Correct Answer: C) The current flow decreases. 56. If one of the resistors in a parallel circuit is removed, the total resistance will be A) Increases. B) Constant. C) Decreases. D) Zero. Show Answer Correct Answer: A) Increases. 57. What happends to potential as it pass through a bulb A) It increase the potential. B) The potential lose a bit of charge. C) Potential loses all of the charge. D) Nothing happend. Show Answer Correct Answer: B) The potential lose a bit of charge. 58. Charge carriers in metals are A) Protons. B) Holes. C) Ions. D) Free electrons. Show Answer Correct Answer: D) Free electrons. 59. Electric currents passing through wires will produce a(n) A) Magnet. B) Solenoid. C) Magnetic field. D) Insulator. Show Answer Correct Answer: C) Magnetic field. 60. Relation connecting resistance and resistivity is ..... A) $\rho$. B) $\rho$. C) $\rho$. D) None of the above. Show Answer Correct Answer: A) $\rho$. ← 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