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 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 15 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. During electrorefining of copper, the pure copper gets deposited on the A) Beaker / vessel used. B) Cathode. C) Wire. D) Anode. Show Answer Correct Answer: B) Cathode. 2. Current in an electric circuit increased it's maximum limit when live wire and neutral wire touches each other due to wear and tear of the wires over a period of time. This phenomenon is known as: A) 4.Heating effect of current. B) 3.Magnetic effect of current. C) 1.Over loading. D) 2.Short-circuit. Show Answer Correct Answer: D) 2.Short-circuit. 3. Which fuse requires replacement of wire after it is broken? A) MCB. B) Cartridge fuse. C) Ceramic fuse. D) None of the above. Show Answer Correct Answer: C) Ceramic fuse. 4. When two or more cells are joined together it forms a A) Dynamo. B) Radio. C) Battery. D) Transistor. Show Answer Correct Answer: C) Battery. 5. The most powerful magnet in the universe is A) Magnetar. B) Magnet. C) All the above. D) None of the above. Show Answer Correct Answer: A) Magnetar. 6. The electric bulb, in a torch as kept at the focus of which mirror? A) Convex mirror. B) Concave mirror. C) Plane mirror. D) None of the above. Show Answer Correct Answer: B) Concave mirror. 7. The movement of electrically charged particles is A) Electric current. B) Electric circuit. C) Electric resistance. D) None of the above. Show Answer Correct Answer: A) Electric current. 8. During electrolysis of water we get ..... A) Hydrogen and oxygen. B) Negative and positive ions. C) Hydrogen and oxides. D) Anode and cathode. Show Answer Correct Answer: A) Hydrogen and oxygen. 9. The salt content of a substance A) Temperature. B) Salinity. C) Convection. D) Density. Show Answer Correct Answer: B) Salinity. 10. Cations are ..... that form ..... ions and ..... electrons. A) Metals, positive, gain. B) Non metals, positove, gain. C) Metals, positive, lose. D) Non metals, positove, lose. Show Answer Correct Answer: C) Metals, positive, lose. 11. What is the primary reason that a compass needle points north? A) The position of the Sun. B) The gravitational pull of the North Pole. C) The magnetic field of the Earth. D) The rotation of the Earth. Show Answer Correct Answer: C) The magnetic field of the Earth. 12. You perform an experiment taking similar bulbs and cells but two different solutions A and B. You find that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that A) Higher current is flowing through the circuit in setup A. B) Higher current is flowing through the circuit in setup B. C) Equal current is flowing through both the circuits. D) No conclusion. Show Answer Correct Answer: A) Higher current is flowing through the circuit in setup A. 13. In which wire, the heat produced would be minimum? A) Tungsten wire of length 20 cm. B) Nichrome wire of length 10 cm. C) Copper wire of length 20 cm. D) Copper wire of length 10 cm. Show Answer Correct Answer: D) Copper wire of length 10 cm. 14. What is the force of attraction or repulsion of magnetic materials? A) Magnetism. B) Energy. C) Electromagnetism. D) Electricity. Show Answer Correct Answer: A) Magnetism. 15. Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating? A) To increase acidity. B) So that the colour becomes more prominent. C) To increase conductivity. D) To burn copper sulphate. Show Answer Correct Answer: C) To increase conductivity. 16. The weather patterns for a given region over time A) Climate. B) Waves. C) Global warming. D) Weather. Show Answer Correct Answer: A) Climate. 17. Electrons move towards the point of ..... potential. A) Higher. B) Lower. C) All the above. D) None of the above. Show Answer Correct Answer: B) Lower. 18. The process used to produce pure copper is called: A) Heating effect. B) Electrolysis. C) Mechanical effect. D) Voltaic effect. Show Answer Correct Answer: B) Electrolysis. 19. What two forces are required for generators and electric motors to work? A) Magnetic and thermal. B) Magnetic and radiant. C) Electric and thermal. D) Electric and magnetic. Show Answer Correct Answer: C) Electric and thermal. 20. What is the role of cathode in electrolysis? A) The cathode repels positively charged ions and is where oxidation occurs. B) The cathode attracts negatively charged ions and is where reduction occurs. C) The cathode attracts positively charged ions and is where reduction occurs. D) The cathode attracts positively charged ions and is where oxidation occurs. Show Answer Correct Answer: C) The cathode attracts positively charged ions and is where reduction occurs. 21. When current is switched 'on' of a bulb it converts ..... energy into ..... energy. A) Electrical, light. B) Electrical, heat. C) Electrical, sound. D) Electrical, mechanical. Show Answer Correct Answer: A) Electrical, light. 22. The colour of insulation of live wire is: A) Green. B) Grey. C) Red. D) Black. Show Answer Correct Answer: C) Red. 23. If resistance increases in the circuit then the heat energy ..... A) Increases. B) Decreases. C) No change. D) All the above. Show Answer Correct Answer: A) Increases. 24. The coil of a wire is known as element A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 25. The device that makes or breaks an electric circuit is? A) Switch. B) Ammeter. C) Resistor. D) Battery. Show Answer Correct Answer: A) Switch. 26. An electric current flows ..... unless it is disrupted in some way A) Drop by drop. B) In spurts. C) Unevenly. D) Continuously. Show Answer Correct Answer: D) Continuously. 27. What are the factors on which the strength of an electromagnet depend? A) 1. number of turns of the coil. B) 2. strength of electric current. C) 3. both 1 and 2. D) None of the above. Show Answer Correct Answer: C) 3. both 1 and 2. 28. Which of the following makes use of magnetic effect of electric current? A) Fridge Magnet. B) Compass. C) Electric Bell. D) None of the above. Show Answer Correct Answer: C) Electric Bell. 29. Which of the following is a good heating element? A) Copper. B) Wood. C) Plastic. D) Nichrome. Show Answer Correct Answer: D) Nichrome. 30. Urvashi made a circuit and saw that some pins kept nearby were being attracted to the wires this is due to the ..... effect of electric current. A) Magnetic. B) Attractive. C) Heating. D) Gravitational. Show Answer Correct Answer: A) Magnetic. 31. Carbon is The only non-metal material that can conduct electricity. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 32. The magnetic strength of a conductor decreases with the increase in current A) True. B) False. C) None of the above. D) None of the above. Show Answer Correct Answer: B) False. 33. An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance. A) $\frac{1}{240}$. B) 180 Ohms. C) 240 Ohms. D) 60 Ohms. Show Answer Correct Answer: C) 240 Ohms. 34. During electrolysis the positively charged ions travel towards Cathode. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 35. In the process of electroplating, pure copper rod is connected to ..... terminal of the battery. A) Positive. B) Negative. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Positive. 36. How does electric current affect the chemical composition of a substance? A) It can cause chemical reactions to occur, leading to changes in the substance's chemical composition. B) It has no effect on the chemical composition. C) It can make the substance taste sweeter. D) It can change the color of the substance. Show Answer Correct Answer: A) It can cause chemical reactions to occur, leading to changes in the substance's chemical composition. 37. Which of the following cannot be harmed by current A) Plastic. B) Rubber. C) All of the above. D) None of the above. Show Answer Correct Answer: C) All of the above. 38. What energy transformation takes place in a battery powered fan that is spinning? A) Kinetic to chemical to electrical. B) Electrical to kinetic to chemical. C) Chemical to kinetic. D) Chemical to electrical to kinetic. Show Answer Correct Answer: D) Chemical to electrical to kinetic. 39. Fill in the blank:CFLs and fluorescent tubes contain ..... A) Nitrogen oxide. B) Carbon vapour. C) Mercury vapour. D) H$_{2}$SO$_{4}$. Show Answer Correct Answer: C) Mercury vapour. 40. A light bulb is an example of a ..... A) Current. B) Resistor. C) Battery. D) None of the above. Show Answer Correct Answer: B) Resistor. 41. Why is it necessary to have a continuous flow of electricity during electrolysis? A) To prevent the formation of unwanted byproducts. B) To create a magnetic field for better separation of ions. C) To increase the temperature of the electrolyte for faster reactions. D) To provide a constant supply of electrons for the reduction and oxidation reactions. Show Answer Correct Answer: D) To provide a constant supply of electrons for the reduction and oxidation reactions. 42. Which of these is a good conductor of electricity? A) Wood. B) Alcohol. C) Milk. D) None of the above. Show Answer Correct Answer: C) Milk. 43. Which of these characteristics will produce the most dense water? A) High salinity, high temperature. B) High salinity, low temperature. C) Low salinity, low temperature. D) Low salinity, high temperature. Show Answer Correct Answer: B) High salinity, low temperature. 44. An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on the: A) The intensity of magnetic field in which coil is moved. B) Number of turns in the coil. C) Speed of magnet with which it moves. D) Resistivity of the wire used in coil. Show Answer Correct Answer: D) Resistivity of the wire used in coil. 45. Electrical device has ..... terminals A) 4. B) 3. C) 2. D) None of the above. Show Answer Correct Answer: C) 2. 46. To electroplate an iron nail with copper, we connect the nail to the ..... electrode A) Positive. B) Negative. C) Any one. D) None of these. Show Answer Correct Answer: B) Negative. 47. What does magnets repelling mean? A) Magnets move away from each other. B) Magnets do not have magnetism. C) Magnets move towards each other. D) None of the above. Show Answer Correct Answer: A) Magnets move away from each other. 48. Which of the following is not an effect of electric current? A) Heating Effect of electric current. B) Colour Changing Effect of electric current. C) Magnetic Effect of electric current. D) None of the above. Show Answer Correct Answer: B) Colour Changing Effect of electric current. 49. In an electric bell, which of these gets attracted to the electromagnet? A) The hammer. B) The soft iron strip. C) The screw. D) None of these. Show Answer Correct Answer: B) The soft iron strip. 50. Which statement describes how deposition builds up the surface of a floodplain? A) Lava flows from a volcano and piles up. B) Rainwater seeps into the ground and freezes. C) A river flows over its banks and slows down. D) A river slows down as it flows into the ocean. Show Answer Correct Answer: D) A river slows down as it flows into the ocean. 51. If the current increases it could be because of ..... A) Increasing voltage. B) Decreasing resistance. C) Both. D) None of the above. Show Answer Correct Answer: C) Both. 52. The shock you sometimes feel when you touch a metal doorknob on a dry day is electric ..... A) Resistance. B) Discharge. C) Current. D) Circuit. Show Answer Correct Answer: B) Discharge. 53. Current consisting of charges that move back and forth in a circuit A) Alternating current. B) Direct current. C) Parallel current. D) Electric current. Show Answer Correct Answer: A) Alternating current. 54. If an object has the same number of positive and negative charges, its electrical charge is ..... A) Opposite. B) Negative. C) Positive. D) Neutral or no charge. Show Answer Correct Answer: D) Neutral or no charge. 55. Differences in water temperature create movement in the Ocean because A) Bodies of water at different temperature have different densities. B) Warm water is pulled more by the force of gravity then cold water is. C) Warm and cold water mix until they reach the same temperature. D) The ocean just likes to "move-it move-it" . Show Answer Correct Answer: A) Bodies of water at different temperature have different densities. 56. What are insulators and how do they differ from conductors? A) Insulators and conductors have the same properties. B) Insulators are materials that do not allow the flow of electricity, while conductors are materials that allow the flow of electricity. C) Conductors are materials that do not allow the flow of electricity. D) Insulators are materials that enhance the flow of electricity. Show Answer Correct Answer: B) Insulators are materials that do not allow the flow of electricity, while conductors are materials that allow the flow of electricity. 57. Two south magnetic poles that are brought near each other ..... A) Attract. B) Shake hands. C) Thumb wrestle. D) Repel. Show Answer Correct Answer: D) Repel. 58. Insectivorous plants eat insects to fulfill their needs of A) Potassium. B) Nitrogen,. C) Energy. D) Calcium. Show Answer Correct Answer: B) Nitrogen,. 59. Coil of wire in room heater is called A) Filament. B) Element. C) Connecting wire. D) None of these. Show Answer Correct Answer: B) Element. 60. The magnetic field around a current carrying coil A) Lasts for three hours. B) Is permanent. C) Lasts till its half-life period. D) Lasts as long as current flows through it. Show Answer Correct Answer: D) Lasts as long as current flows through it. ← 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 6Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 7Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books