This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 26 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 26 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Distilled water becomes a good conductor of electricity on dissolving A) A little salt in it. B) Little sugar in it. C) Both. D) None of these. Show Answer Correct Answer: A) A little salt in it. 2. Cations are negatively charged ions. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 3. According to right hand thumb rule the direction of magnetic field in a current carrying straight conductor is denoted by: A) Thumb. B) Curl fingers. C) Middle finger. D) First finger. Show Answer Correct Answer: B) Curl fingers. 4. When does the filament of a bulb give off light A) When it breaks. B) When it burns. C) When it heats. D) None of the above. Show Answer Correct Answer: C) When it heats. 5. In a conducting liquid electricity is conducted with the help of: A) Proton. B) Neutron. C) Electron. D) Ions. Show Answer Correct Answer: D) Ions. 6. Electricity and magnetism are connected to each other. Electricity can produce magnetism. When an electric current flows through a wire, the current creates a very small magnetic field. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. How many volts would we need to produce a current flow of 8 A through a 6 $\Omega$ resistor A) 12 V. B) 24 V. C) 1.33 V. D) 48 V. Show Answer Correct Answer: D) 48 V. 8. In an experiment, a student wraps a copper wire around a nail and connects it to a battery. What is the student likely trying to demonstrate? A) The creation of a permanent magnet. B) The principles of gravitational force. C) The concept of an electromagnet. D) The effects of static electricity. Show Answer Correct Answer: C) The concept of an electromagnet. 9. The plane of the loop is perpendicular to the magnetic field the torque on the current loop is ..... A) Zero. B) Maximum. C) Minimum. D) Equal. Show Answer Correct Answer: A) Zero. 10. Electrolyte that ionise completely to form free mobile ions in the solution is known as A) Strong electrolytes. B) Weak electrolytes. C) Cathode. D) Anode. Show Answer Correct Answer: A) Strong electrolytes. 11. What is the purpose of using a sacrificial anode in corrosion prevention? A) To protect the primary metal structure by corroding itself instead. B) To increase the rate of corrosion on the primary metal structure. C) To provide additional strength to the primary metal structure. D) To attract more moisture to the primary metal structure. Show Answer Correct Answer: A) To protect the primary metal structure by corroding itself instead. 12. Which among the following is the diadvantage of heating effect of current? A) 1.It can break the insulation of wires/ devices. B) 2.It prevents energy loss. C) 3.It is used in working of electric fuse. D) None of the above. Show Answer Correct Answer: A) 1.It can break the insulation of wires/ devices. 13. In case of thunderstorms, we use ..... to protect appliances. A) Electric fuse. B) Switch. C) Heating element. D) None of the above. Show Answer Correct Answer: A) Electric fuse. 14. Explain the concept of electroplating. A) Electroplating is the process of coating a metal object with a thin layer of another metal using electricity. B) Electroplating involves heating metal objects to create a shiny surface. C) Electroplating is the process of coating a metal object with a thin layer of plastic using electricity. D) Electroplating is a method of removing metal from objects using chemicals. Show Answer Correct Answer: A) Electroplating is the process of coating a metal object with a thin layer of another metal using electricity. 15. Thin metal wire inside the electric bulb A) Fiber. B) Terminal. C) Filament. D) None of the above. Show Answer Correct Answer: C) Filament. 16. Which of these is plated on the iron to prevent it from chemically reacting with food? A) Gold. B) Chromium. C) Tin. D) Zinc. Show Answer Correct Answer: C) Tin. 17. Electroplating is a process whereby a metal surface is coated with a non-metal. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 18. What is the amount of current flowing through an electric press, if the amount of charge passing through a conductor in 10 minutes is 300 $^{0 }$C? A) 30 A. B) .3 A. C) .5 A. D) 5 A. Show Answer Correct Answer: C) .5 A. 19. Which among the following are the advantages of heating effect of current? A) 1.Can be used in electric fuse. B) 2.Increases the life of several appliances in the circuit. C) 3.It helps in preventing loss of energy. D) None of the above. Show Answer Correct Answer: A) 1.Can be used in electric fuse. 20. The device used for producing electric current is called a: A) Generator. B) Galvanometer. C) Ammeter. D) Motor. Show Answer Correct Answer: A) Generator. 21. The greater the resistance offered by the wire to the flow of current, the ..... would be the heat generated. A) Lesser. B) Smaller. C) Greater. D) None of the above. Show Answer Correct Answer: C) Greater. 22. The amount of matter in a given volume A) Climate. B) Weather. C) Density. D) Convection. Show Answer Correct Answer: C) Density. 23. In a non-uniform magnetic field the field lines are: A) Parallel lines. B) Non-parallel lines. C) Spiral. D) None of these. Show Answer Correct Answer: B) Non-parallel lines. 24. Though we specify the direction of direct current by putting an arrow, why is it not considered a vector quantity? A) Because current does not obey the laws of vector addition. B) Because charge is Quantized. C) Because conventional direction of current is only virtual. D) Because current obeys Kirchhoff Laws. Show Answer Correct Answer: A) Because current does not obey the laws of vector addition. 25. Name the effect that causes a coil of current-carrying wire in an electric motor to move. A) The electromagnetism effect. B) The magnetic effect. C) The motor effect. D) None of the above. Show Answer Correct Answer: C) The motor effect. ← 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