This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 24 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 24 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How is electric potential measured A) Voltmeter. B) Galvanometer. C) Ammeter. D) It cannot be measured= infinity. Show Answer Correct Answer: A) Voltmeter. 2. The electrode thats connected to the positive terminal of the battery is called a A) Anode. B) Cathode. C) Elctrode. D) None of the above. Show Answer Correct Answer: A) Anode. 3. Why is it important to use a salt bridge in an electrolytic cell? A) To prevent the flow of ions between the two half-cells. B) To reduce the efficiency of the electrolytic cell. C) To increase the temperature of the electrolyte. D) To maintain electrical neutrality and allow the flow of ions between the two half-cells. Show Answer Correct Answer: D) To maintain electrical neutrality and allow the flow of ions between the two half-cells. 4. A rectangular coil of copper wire is rotated in a magnetic field. The direction of induced current changes once in each: A) Two revolutions. B) One revolution. C) Half revolution. D) One-fourth revolution. Show Answer Correct Answer: C) Half revolution. 5. THERE ARE 2 WIRES CALLED LEADS ATTACHED TO THE LED.One lead is slightly longer than the other. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 6. Surrounding every magnet is a ..... ..... A) Magnetic field. B) Electrical current. C) Another magnet. D) None of the above. Show Answer Correct Answer: A) Magnetic field. 7. Most liquids that conduct electricity are solution of acids, bases and distilled water A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 8. Who developed the ISI mark? A) Bureau of India standard. B) Bureau Indian standards. C) Bureau India standard. D) Bureau of Indian Standards. Show Answer Correct Answer: D) Bureau of Indian Standards. 9. Which of the given statements is true for a switch? A) It allows for the flow of electricity. B) It controls the brightnessof a bulb. C) It controls the powerof the batteries. D) It fuses a bulb. Show Answer Correct Answer: A) It allows for the flow of electricity. 10. When an electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates A) The chemical effect of current. B) The heating effect of current. C) The magnetic effect of current. D) The lightning effect of current. Show Answer Correct Answer: A) The chemical effect of current. 11. Which of the following is not used for electroplating metal articles? A) Nickel. B) Silver. C) Chromium. D) Sodium. Show Answer Correct Answer: D) Sodium. 12. Explain the process of electrolysis. A) Electrolysis is the process of using a magnetic field to drive a chemical reaction. B) Electrolysis is the process of using heat to drive a spontaneous chemical reaction. C) Electrolysis is the process of using an electric current to drive a non-spontaneous chemical reaction. D) Electrolysis is the process of using sound waves to drive a non-spontaneous chemical reaction. Show Answer Correct Answer: C) Electrolysis is the process of using an electric current to drive a non-spontaneous chemical reaction. 13. When we connect a fused bulb to a working cell this circuit is A) Open circuit. B) Closed circuit. C) Open cell. D) Closed cell. Show Answer Correct Answer: A) Open circuit. 14. When magnesium ribbon burnt it produce A) Magnesium hydroxide. B) Magnesium oxide. C) Magnesium chloride. D) Magnesium sulphate. Show Answer Correct Answer: B) Magnesium oxide. 15. Choose the statement which is not correct in the case of an electric fuse. A) Fuses are inserted in electric circuits of all buildings. B) There is a maximum limit on the current which can safely flow through the electric circuits. C) There is a minimum limit on the current which can safely flow in the electric circuits. D) If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit. Show Answer Correct Answer: C) There is a minimum limit on the current which can safely flow in the electric circuits. 16. The bulb which does not glow is said to be A) Fly. B) Fused. C) Filled. D) Fluid. Show Answer Correct Answer: B) Fused. 17. We can also detect weak electric current flowing through a liquid by using a A) Metal. B) Silver. C) Compass. D) None of the above. Show Answer Correct Answer: C) Compass. 18. The circulation of hot and cold fluids (liquids and gases) A) Convection. B) Radiation. C) Density. D) Temperature. Show Answer Correct Answer: A) Convection. 19. What happens during the process of erosion? A) Sediment forms. B) Sediment is moved. C) Sediment is dropped. D) Sediment hardens into rock. Show Answer Correct Answer: B) Sediment is moved. 20. When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion? A) Explosion. B) Random combustion. C) Rapid combustion. D) Spontaneous combustion. Show Answer Correct Answer: A) Explosion. 21. When Bethany walks across a carpet, her socks pick up many electric charges. Later in the day, these charges are no longer present on her socks. What most likely happened to the charges? A) The charges disappeared. B) The charges switched signs. C) The charges transferred to another object. D) The charges broke apart into smaller particles. Show Answer Correct Answer: C) The charges transferred to another object. 22. Electroplating is based on A) Chemical effect of electricity. B) Magnetic effect of electricity. C) Heating effect of electricity. D) Physical effect of electricity. Show Answer Correct Answer: A) Chemical effect of electricity. 23. Those substances which have extremely high resistance are called as ..... A) Ametre. B) Insulator. C) Conductors. D) Current. Show Answer Correct Answer: B) Insulator. 24. Nichrome Wire Is Used In: A) CFL. B) Electric fuse. C) Hair dryer. D) MCB. Show Answer Correct Answer: C) Hair dryer. 25. Every working circuit has at least three parts:1) a power source, 2) a conductor, usually wire and 3) A) Insulator. B) An object that uses electric current like a light bulb. C) Series circuit. D) Rock. Show Answer Correct Answer: B) An object that uses electric current like a light bulb. ← PreviousNext →Related 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 8Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 9Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books