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 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 22 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Drift velocity v$_{d}$ varies with the intensity of the electric field as per the relation A) Vd $\propto$ $E^2$. B) Vd $\propto$ $\frac{1}{E}$. C) V$_{d}$=constant. D) Vd $\propto$. Show Answer Correct Answer: D) Vd $\propto$. 2. A high resistance light bulb and a low resistance light bulb are connected in series to a 6-Volt pack of batteries. Which of the two light bulbs will shine the brightest? A) They will have the same brightness. B) The low-R bulb will shine more brightly. C) The high-R bulb will shine more brightly. D) None of the above. Show Answer Correct Answer: C) The high-R bulb will shine more brightly. 3. A complete, unbroken path through which charges can easily flow. A) Current. B) Ohm. C) Circuit. D) Voltage. Show Answer Correct Answer: C) Circuit. 4. When magnetic field lines are drawn, how do they look? A) Straight lines. B) Criss-crossed lines like X's. C) Curved lines from N to S pole and outwards. D) Lines extending outward in all directions like drawing the Sun. Show Answer Correct Answer: C) Curved lines from N to S pole and outwards. 5. What is the magnitude of the electrostatic force that a charge of +3.0 X 10$^{-5}$ coulomb exerts on a charge of +6.0 X 10$^{-6}$ coulomb that is 0.30 meter away? A) 5.4 X 10$^{0}$ N. B) 1.8 X 10$^{-3}$ N. C) 5.4 X 10$^{-2}$ N. D) 1.8 X 10$^{1}$ N. Show Answer Correct Answer: D) 1.8 X 10$^{1}$ N. 6. Three resistors:R1 = 5 $\Omega$, R2 = 3 $\Omega$, and R3 = 4 $\Omega$ are connected in series to each other. A voltmeter connected in parallel to resistor R2 measures voltage of 6 V. What is the net voltage in the circuit? A) 12 V. B) 16 V. C) 20 V. D) 24 V. Show Answer Correct Answer: D) 24 V. 7. More resistance means more current. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 8. You can increase the strength of an electromagnet are increasing the current, adding iron to the core, and ..... A) Increasing the number of coils on the magnet. B) Decreasing the number of coils on the magnet. C) Dividing the number of coil. D) None of the above. Show Answer Correct Answer: A) Increasing the number of coils on the magnet. 9. If you increase the resistance of a parallel circuit by adding more loads, what happens? A) Electrons disappear. B) Current increases at the souce. C) Bulbs get brighter. D) Current decreases at the source. Show Answer Correct Answer: B) Current increases at the souce. 10. A standard resistance of 1 ohm and a small resistance 'r' are connected in series. The balancing length on potentiometer wire corresponding to this combination is 630 cm whereas the balancing length corresponding to 1 ohm resistance is 600 cm. The value of 'r' will be ..... A) 1 ohm. B) 0.5 ohm. C) 0.05 ohm. D) 2 ohm. Show Answer Correct Answer: C) 0.05 ohm. 11. ..... termed the word electriciity. A) Benjamin Franklin. B) William Gilbert. C) Isaac Newton. D) None of the above. Show Answer Correct Answer: B) William Gilbert. 12. The chemical reaction inside a secondary cell is A) Reversibe. B) Irreversible. C) All the above. D) None of the above. Show Answer Correct Answer: A) Reversibe. 13. What is the unit of electrical power? A) Ampere (A). B) Ohm ($\Omega$). C) Volt (V). D) Watt (W). Show Answer Correct Answer: D) Watt (W). 14. Negative charges will repel A) Positive charges. B) Neutral charges. C) Negative charges. D) All charges. Show Answer Correct Answer: C) Negative charges. 15. How does the power consumed by a resistor change if the voltage across it is doubled? A) The power consumed by the resistor remains the same. B) The power consumed by the resistor increases by a factor of four. C) The power consumed by the resistor decreases by half. D) The power consumed by the resistor increases by a factor of two. Show Answer Correct Answer: B) The power consumed by the resistor increases by a factor of four. 16. The coil of current-carrying wire with an iron core is called a(n) A) Ferromagnet. B) Electromagnet. C) Compass. D) Maglev. Show Answer Correct Answer: B) Electromagnet. 17. If the current flowing through a fixed resistor is halved, the heat produced in it will become ..... A) One-half. B) Four times. C) One-fourth. D) Double. Show Answer Correct Answer: C) One-fourth. 18. What is the current if a charge of 25 coulombs passes in 5 seconds? A) 0.2 Amps. B) 125 Amps. C) 5 Amps. D) None of the above. Show Answer Correct Answer: C) 5 Amps. 19. Work done in moving a charge of 2C across 2 points having a potential difference of 12V is A) 24J. B) 48J. C) 12J. D) 6J. Show Answer Correct Answer: A) 24J. 20. By using only two resistors, R$_{1}$ and R$_{2}$, a student is able to obtain resistances of 3 $\Omega$, 4 $\Omega$, 12 $\Omega$, and 16 $\Omega$. The values of R$_{1}$ and R$_{2}$ (in ohms) are: A) 3, 16. B) 4, 12. C) 4, 16. D) 3, 4. Show Answer Correct Answer: B) 4, 12. 21. If you have a 3 bulb series circuit, what will happen if one of your light bulbs goes out? A) Nothing happens. B) Bulbs get brighter. C) Bulbs go out. D) Bulbs get dimmer. Show Answer Correct Answer: C) Bulbs go out. 22. In the wheatstone Bridge all four arms have equal resistance R and Galvanometer also has R resistance. Find the equivalent resistance of the ckt A) 2R. B) R/4. C) R. D) R/2. Show Answer Correct Answer: C) R. 23. Ampere is the SI unit of which of the following quantities A) Luminous Intensity. B) Resistance. C) Electric Current. D) Pressure. Show Answer Correct Answer: C) Electric Current. 24. What is the maximum resistance which can be made using five resistor each of 1/5 ohm? A) 5 ohm. B) 10 ohm. C) 1 ohm. D) 1/5 ohm. Show Answer Correct Answer: C) 1 ohm. 25. The metal wire that glows in a light bulb A) Filament. B) Glass. C) Support wires. D) Metal tip. Show Answer Correct Answer: A) Filament. 26. The quantity which remains same in series combination of resistors is ..... A) Voltage. B) Current. C) Power. D) None of the above. Show Answer Correct Answer: B) Current. 27. Electricity is a form of energy produced by charges. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 28. Electrical conductor contains A) Only bound electrons. B) Neither bound nor free electrons. C) Only free. D) Both free and bound electrons. Show Answer Correct Answer: D) Both free and bound electrons. 29. Where is the strongest attraction force of the magnet? A) At the poles. B) In the middle. C) Above the magnet. D) Below the magnet. Show Answer Correct Answer: A) At the poles. 30. Which of the following is a real-world application of current electricity? A) Powering a television. B) Lightning during a storm. C) A balloon sticking to a wall after being rubbed. D) A spark from a doorknob. Show Answer Correct Answer: A) Powering a television. 31. A galvanometer can be converted into a voltmeter by connecting a A) High resistance in parallel. B) High resistance in series. C) Low resistance in parallel. D) Low resistance in series. Show Answer Correct Answer: B) High resistance in series. 32. Which side of the circuit has the less amount of voltage? A) The negative side. B) The bulbs. C) The positive side. D) The wires near the bulbs. Show Answer Correct Answer: A) The negative side. 33. If too much electricity is flowing through a circuit wires heat up and can start a fire A) Short circuit. B) Parallel circuit. C) Series circuit. D) Terminals. Show Answer Correct Answer: A) Short circuit. 34. Which statement is true about the drift velocity of the electrons in a current-carrying metallic conductor? A) It is directly proportional to the diameter of the conductor. B) It is inversely proportional to the current. C) It is directly proportional to the resistance of the conductor if the potential difference across the conductor is kept constant. D) It is inversely proportional to the number of conduction electrons per unit volume. Show Answer Correct Answer: D) It is inversely proportional to the number of conduction electrons per unit volume. 35. This measures the speed of the current in a circuit A) Switch. B) Voltage. C) Resistance. D) Ammeter. Show Answer Correct Answer: D) Ammeter. 36. A voltmeter is described as a device that can be used to measure A) Resistance. B) Power. C) Current. D) Voltage. Show Answer Correct Answer: D) Voltage. 37. Current is referred to as: A) Flow of electricity. B) Circuits. C) Flow of electrons. D) Batteries. Show Answer Correct Answer: C) Flow of electrons. 38. If resistance slows the current, you will need more ..... to speed it up. A) Resistance. B) Voltage. C) Current. D) None of the above. Show Answer Correct Answer: B) Voltage. 39. What reusable device stops the flow of charges by switching "off" the current if it gets too high? A) Charger. B) Fuse. C) Circuit breaker. D) Outlet. Show Answer Correct Answer: C) Circuit breaker. 40. The pathway through which electrical current flows A) Flows. B) Electromagnet. C) Insulator. D) Circuit. Show Answer Correct Answer: D) Circuit. 41. What is the equation to calculate current in a circuit? A) I = V x R. B) I = V / R. C) I = Q / t. D) I = P / V. Show Answer Correct Answer: C) I = Q / t. 42. Work of 24 J is done in a moving 4 C ( coulomb )of charge between two points on a conductor wire, then the potential difference between two points is A) 0.6 V. B) 6 V. C) 14 V. D) 24 V. Show Answer Correct Answer: B) 6 V. 43. SI unit if resistivity A) Ohm metre. B) Volt. C) Ampere. D) Ohm. Show Answer Correct Answer: A) Ohm metre. 44. A device used to open or close a circuit A) Switch. B) Charge. C) Electricity. D) Battery. Show Answer Correct Answer: A) Switch. 45. A wire of resistance R is stretched to twice of its original length. Its new resistance will be A) 4R. B) 3R. C) R/3. D) R/9. Show Answer Correct Answer: A) 4R. 46. This type of circuit only has one path for current to flow. A) Series. B) Parallel. C) Combination. D) Split. Show Answer Correct Answer: A) Series. 47. Assertion:dielectric polarization means formation of positive and negative charges inside the dielectricReason:free electrons are formed in this process A) Assertion is correct and reason is a correct explanation of assertion. B) Assertion is correct but reason is not a correct explanation of assertion. C) Assertion is correct, reason is incorrect. D) None of the above. Show Answer Correct Answer: C) Assertion is correct, reason is incorrect. 48. A copper wire is connected across the terminals of battery of e.m.f. 9.0 V.Calculate the electrical energy used to move 50 C of charge across the complete circuit. A) 0.18 J. B) 5.56 J. C) 450 J. D) None of the above. Show Answer Correct Answer: C) 450 J. 49. The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is A) 23 $\times$ $\pm$. B) 12 $\times$ $\pm$. C) 21 $\times$ $\pm$. D) 21 $\times$ $\pm$. Show Answer Correct Answer: C) 21 $\times$ $\pm$. 50. What type of equipment is used to measure the current induced when a wire passes through a magnetic field? A) A galvanometer. B) An insulated wire. C) A generator. D) A transformer. Show Answer Correct Answer: A) A galvanometer. 51. How does an ammeter is added in the circuit? A) Series. B) Parallel. C) All the above. D) None of the above. Show Answer Correct Answer: A) Series. 52. Explain Kirchhoff's Second Law with a practical application. A) Kirchhoff's Second Law states that the sum of the emf in a closed loop equals the sum of the potential drops across components. B) The sum of currents in a closed loop equals the sum of the voltages across components. C) The total resistance in a circuit is equal to the sum of the individual resistances. D) Kirchhoff's Second Law states that energy is conserved in electrical circuits. Show Answer Correct Answer: A) Kirchhoff's Second Law states that the sum of the emf in a closed loop equals the sum of the potential drops across components. 53. Apply your understanding of electricity to select the essential element needed to create static electricity: A) Contact between two insulators. B) A source of moisture. C) A complete circuit. D) A good conductor. Show Answer Correct Answer: A) Contact between two insulators. 54. Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps A) 30 volts. B) 0.08 volts. C) 12 volts. D) 300 volts. Show Answer Correct Answer: C) 12 volts. 55. A flow of 10$^{7 }$electrons per second in a conduction wire constitutes a current of A) 1.6 x 10$^{-12}$ A. B) 1.6 x 10$^{ 26}$ A. C) 1.6 x 10$^{-26}$ A. D) 1.6 x 10$^{ 12}$ A. Show Answer Correct Answer: A) 1.6 x 10$^{-12}$ A. 56. Two wires of the same material having equal area of cross section having length L and 2L. Their respective resistance are in the ratio A) 2:1. B) 1:3. C) 1:2. D) 1:1. Show Answer Correct Answer: C) 1:2. 57. Ammeter is used to measure ..... A) Voltage. B) Electric current. C) Resistance. D) Resistivity. Show Answer Correct Answer: B) Electric current. 58. Which part of a circuit could start and stop the flow of electric current? A) Switch. B) Wire. C) Light bulb. D) Battery. Show Answer Correct Answer: A) Switch. 59. What happens to the voltage before AC is used at home? A) It is increased. B) It is decreased. C) It remains the same. D) None of the above. Show Answer Correct Answer: B) It is decreased. 60. (a) is the best electrical conductor A) Plastic Tubing. B) Cotton String. C) Glass Rod. D) A. Copper Penny. Show Answer Correct Answer: D) A. Copper Penny. ← 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