This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Electric Current And Its Effects > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Filament is made up of which metal? A) Gold. B) Tungsten. C) Bonze. D) Copper. Show Answer Correct Answer: B) Tungsten. 2. Combination of electric cells is called A) Bulb. B) Battery. C) Cells. D) None of the above. Show Answer Correct Answer: B) Battery. 3. When current is passed through a wire, it behaves like A) Conductor. B) Magnet. C) Insulator. D) None of the above. Show Answer Correct Answer: B) Magnet. 4. Electic current is the flow of particles with ..... A) A negative charge. B) A positive charge. C) Both positive and negative charges flowing opposite to each other. D) Either positive or negative charge depending on the material. Show Answer Correct Answer: A) A negative charge. 5. The products of combustion are A) Carbon dioxide. B) Oxygen & water. C) Water and fire. D) None of the above. Show Answer Correct Answer: A) Carbon dioxide. 6. Who put a compass near the electric cable? A) Alva edison. B) Party. C) Oasted. D) Cable. Show Answer Correct Answer: C) Oasted. 7. In the equation I = nAvq, what does v represent? A) The speed of the electrons. B) The average speed of the electrons. C) The velocity of the electrons. D) The average velocity of the electrons. E) The fastest speed of all electrons. Show Answer Correct Answer: D) The average velocity of the electrons. 8. What is the part of a simple d.c. motor that reverses the direction of current through the coil every half-cycle? A) The commutator. B) The armature. C) The slip rings. D) The brushes. Show Answer Correct Answer: A) The commutator. 9. Who discovered chemical effect of elecric current? A) Thomas Edison. B) Joule-Lence. C) Michael Faraday. D) James Watt. Show Answer Correct Answer: C) Michael Faraday. 10. When you suspend a bar magnet freely the north pole of the magnet points ..... of the earth A) South Poles. B) North poles. C) All the above. D) None of the above. Show Answer Correct Answer: B) North poles. 11. Which of the following an insulator? A) Wood. B) Copper. C) Salt water. D) Silver. Show Answer Correct Answer: A) Wood. 12. Which charges actually move? A) Negative. B) Positive. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Negative. 13. Circuits in your home, school, or other buildings are ..... circuits. A) Series. B) Parallel. C) Short. D) None of the above. Show Answer Correct Answer: B) Parallel. 14. There are ..... types of effects of electric current A) 3. B) 5. C) 4. D) 2. Show Answer Correct Answer: C) 4. 15. The strength of magnetic field between the poles of an electromagnet would be unchanged if A) Distance between the poles of electromagnet were doubled. B) Direction of current in electromagnet winding were reversed. C) Current in the electromagnet winding were doubled. D) Material of the core of electromagnet where changed. Show Answer Correct Answer: B) Direction of current in electromagnet winding were reversed. 16. What charge does a proton have? A) Negative (-). B) Positive (+). C) Neutral or no charge (0). D) None of the above. Show Answer Correct Answer: B) Positive (+). 17. When dealing with batteries, the negative side is the higher potential. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 18. In a non-uniform magnetic field the lines of force are: A) Circular. B) Parallel to each other. C) Non parallel. D) None of these. Show Answer Correct Answer: C) Non parallel. 19. Copper get transferred from the ..... to the ..... A) Anode, cathode. B) Cathode, anode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode, cathode. 20. Ria made a electrolytic cell with carbon rods as electrodes and alcohol as electrolyte. She used 2 cells. But the cell did not work. Why? A) Because the electrodes were made up of carbon. B) Because alcohol does not conduct electricity. C) Maybe the cells provided enough energy. D) None of the above. Show Answer Correct Answer: B) Because alcohol does not conduct electricity. 21. Those substances which have very low resistance are called as ..... A) Insulators. B) Ametre. C) Conductors. D) Voltmeter. Show Answer Correct Answer: C) Conductors. 22. The arrangement where an electric current flows in a conductor when it is connected to a source of electric current is known as A) Conducting wires. B) Electric circuit. C) Elements of a circuit. D) Electrical energy. Show Answer Correct Answer: B) Electric circuit. 23. An electric current that continually reverses direction over time is known as a(n) A) Direct current. B) Alternating current. C) Simple current. D) None of the above. Show Answer Correct Answer: B) Alternating current. 24. A bulb uses which of the following effect of electric current to glow? A) Heating Effect. B) Magnetic Effect. C) Chemical Effect. D) All of the above. Show Answer Correct Answer: A) Heating Effect. 25. Conduction of electricity in liquids occurs through electrons. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 26. What gets deposited on the plate connected to the negative terminal of the battery? A) Silver. B) Zinc. C) Gold. D) Copper. Show Answer Correct Answer: D) Copper. 27. The path along which electricity travels. A) Electric Discharge. B) Fuse. C) Insulator. D) Electric circuit. Show Answer Correct Answer: D) Electric circuit. 28. For electroplating an iron object with copper metal, a copper plate is made ..... A) Positive electrode. B) Negative electrode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive electrode. 29. Which is NOT a distinguishing feature of an electric generator? A) An electric generator converts electrical energy into mechanical energy. B) It is based on the principle of electromagnetic induction. C) It generates electricity. D) An electric generator converts mechanical energy into electrical. Show Answer Correct Answer: A) An electric generator converts electrical energy into mechanical energy. 30. Every magnet has 2 poles ..... and ..... A) North and south. B) East and west. C) All the above. D) None of the above. Show Answer Correct Answer: A) North and south. 31. Unlike poles of a magnet will A) Repel. B) Attract. C) All the above. D) None of the above. Show Answer Correct Answer: B) Attract. 32. Which of the following is the CORRECT description of the operation of an electric motor? A) The electric motor uses electricity. B) The operation is based on the principle of electromagnetism. C) The motor converts electric energy into mechanical energy. D) All of the above. Show Answer Correct Answer: D) All of the above. 33. If a positive terminal of one cell is connected to the negative terminal of the next cell it is known as A) Element. B) Fuse. C) Battery. D) Electric current. Show Answer Correct Answer: C) Battery. 34. ..... is a naturally occurring magnet. A) Lodestone. B) Hapstone. C) Loading. D) Walking stone. Show Answer Correct Answer: A) Lodestone. 35. What process brings the deep cold ocean currents up to the surface? A) Conduction. B) Global Wind Patterns. C) Convection Currents. D) Temperature and salinity. Show Answer Correct Answer: C) Convection Currents. 36. Which of the following metals is used in electroplating to make objects appear shining? A) Chromium. B) Iron. C) Aluminium. D) Copper. Show Answer Correct Answer: A) Chromium. 37. The process of depositing a layer of any desired metal on another metal by means of electricity is called? A) Scratching. B) Corroding. C) Electroplating. D) Chromo-plating. Show Answer Correct Answer: C) Electroplating. 38. Nichrome contains A) 20% nickel 80% chromium. B) 80% nickel 20% chromium. C) 40 % chromium 60% zinc. D) None of the above. Show Answer Correct Answer: B) 80% nickel 20% chromium. 39. Which of these particles are responsible for the flow of electric current-electrons, protons or neutrons? A) Electrons. B) Protons. C) Neutrons. D) None of the above. Show Answer Correct Answer: A) Electrons. 40. What is the formula for current? A) I = W/Q. B) I = t/Q. C) I = W/t. D) I = Q/t. Show Answer Correct Answer: D) I = Q/t. 41. When the bulb gets fused, its filament is broken. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 42. The frequency of D.C. is: A) 100 Hz. B) 0 Hz. C) 60 Hz. D) 50 Hz. Show Answer Correct Answer: B) 0 Hz. 43. Which of the following types of water would SINK the fastest? A) Warm and salty. B) Cold and salty. C) Warm and fresh. D) Cold and fresh. Show Answer Correct Answer: B) Cold and salty. 44. During electrolysis of water, hydrogen gas is deposited at which electrode? A) Positive electrode. B) Negative electrode. C) All the above. D) None of the above. Show Answer Correct Answer: B) Negative electrode. 45. Tick the electric apps working with mechanical effect of electric current A) Electric kettle. B) Compass. C) Electric oven. D) Juice squeezer. Show Answer Correct Answer: D) Juice squeezer. 46. Which of the following is used as a safety device? A) Resistor. B) Switch. C) Bulb. D) Fuse. Show Answer Correct Answer: D) Fuse. 47. Mary-Alice likes to bring her coffee to work each morning. However, she wonders what the best cup to bring would be if she wants her coffee to stay warm. Which of the following materials would keep Mary-Alice's coffee warm the longest? A) Styrofoam. B) Plastic. C) Glass. D) Paper. Show Answer Correct Answer: A) Styrofoam. 48. What would happen to the coiled wire in an electric motor model if there are repulsion and attraction of the magnetic poles? A) The coil fluctuates and converts electrical energy into chemical energy. B) The coil stops and changes mechanical energy into electrical energy. C) The coil rotates and changes electrical energy into mechanical energy. D) The coil remains unstable. Show Answer Correct Answer: C) The coil rotates and changes electrical energy into mechanical energy. 49. If the current at a given point in a circuit is 2.5 Amp, then how many electrons pass that point on the circuit in a time period of 1 minute.Answer: A) 9.375 x 10$^{21 }$ electrons. B) 9.375 x 10$^{20 }$ electrons. C) 9.375 x 10$^{18}$ electrons. D) 9.375 x 10$^{19 }$ electrons. Show Answer Correct Answer: B) 9.375 x 10$^{20 }$ electrons. 50. Which of the following is inflammable Substances? A) Straw. B) Wood. C) Petrol. D) Paper. Show Answer Correct Answer: C) Petrol. 51. A student wants to increase the strength of an electromagnet. Which of these is a way to make the electromagnet stronger? A) Wrapping the wire around the iron core fewer times. B) Replacing the iron core with a copper core. C) Increasing the electric current flowing through the wire. D) Replacing the copper wire with plastic wire. Show Answer Correct Answer: C) Increasing the electric current flowing through the wire. 52. What is electromagnet A) Current carrying coil of insulated wire wrapped around a piece of iron. B) Bar magnet. C) Horseshoe magnet. D) None of the above. Show Answer Correct Answer: A) Current carrying coil of insulated wire wrapped around a piece of iron. 53. What current must flow in an infinitely long straight wire to produce a magnetic field of $4\\times10^5$ A) 1.6 A. B) 160 A. C) .16 A. D) 16 A. Show Answer Correct Answer: D) 16 A. 54. What unit is used to measure voltage? A) Omega. B) Volts. C) Amps. D) Ohms. Show Answer Correct Answer: B) Volts. 55. If a material is less dense then water, it will A) Sink. B) Float. C) Be neutrally buoyant. D) Freeze. Show Answer Correct Answer: B) Float. 56. The substance used to make permanent magnet is: A) Copper. B) Aluminium. C) Alno. D) None of these. Show Answer Correct Answer: C) Alno. 57. During electroplating, the metal to be plated is at the- A) Anode. B) Cathode. C) Any would do. D) Both of them. Show Answer Correct Answer: A) Anode. 58. Th ree wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque? A) Circle. B) Semi-circle. C) Square. D) All of them. Show Answer Correct Answer: A) Circle. 59. A glowing filament will be? A) At atmospheric temperature. B) At a low temperature. C) At a high temperature. D) At the temperature of the ice. Show Answer Correct Answer: C) At a high temperature. 60. What kind of products contain ISI mark? A) Electrical appliances. B) Switches, Motors, Wiring Cables. C) Computers, Mobiles. D) None of the above. Show Answer Correct Answer: B) Switches, Motors, Wiring Cables. ← PreviousNext →Related QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 10 Electric Current And Its Effects Quiz 1Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 2Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 3Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 4Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 5Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 7Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 8Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books