This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 23 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Substances that do not conduct electricity are called ..... A) Conductors. B) Insulators. C) Non-insulators. D) None. Show Answer Correct Answer: B) Insulators. 2. If the direction of current in a coil at its one face is anti-clockwise this end of coil will be: A) South pole. B) North pole. C) Both (a) and (b). D) None of these. Show Answer Correct Answer: A) South pole. 3. A 120 w light bulb uses more ..... than a 60 w light bulb. A) Thermal energy. B) Electrical energy. C) All the above. D) None of the above. Show Answer Correct Answer: B) Electrical energy. 4. Alloys of metals A) Allow electric current to flow through them. B) Do not allow electric current to flow through them. C) Sometimes allow and sometimes do not allow electric current to flow through them. D) None of these. Show Answer Correct Answer: A) Allow electric current to flow through them. 5. Iron objects can be protected by electroplating them with A) Chromium. B) Nickel. C) Zinc. D) All of these. Show Answer Correct Answer: D) All of these. 6. Flow of electron is called A) Electroplating. B) Electric current. C) Electrodes. D) Electrolyte. Show Answer Correct Answer: B) Electric current. 7. What does the word "circumpolar" mean? A) Circular path around the poles. B) Wind-blown current. C) Cold and salty. D) Sinking. Show Answer Correct Answer: A) Circular path around the poles. 8. Where can the key and the switch can be placed in the circuit? A) Left side of the battery. B) Right side of the battery. C) Near the positive terminal of the bulb. D) Can be placed anywhere in the circuit. Show Answer Correct Answer: D) Can be placed anywhere in the circuit. 9. The amount of heat in a wire depends on A) Length. B) Material. C) Capacity. D) Both length and material. E) All of these. Show Answer Correct Answer: D) Both length and material. 10. Chromium plating is done on many objects such as car parts, bar taps, kitchen gas stoves etc. Why? A) It does not corrode but prevents scratches. B) It looks beautiful. C) Cost less. D) Articles can be sold at higher price. Show Answer Correct Answer: A) It does not corrode but prevents scratches. 11. An electric bell works on the ..... effect of electric current. A) Electric. B) Heating. C) Magnetic. D) Chemical. Show Answer Correct Answer: C) Magnetic. 12. Tin cans used for storing food are made by electroplating A) Copper on iron. B) Iron on tin. C) Tin on zinc. D) Tin on iron. Show Answer Correct Answer: D) Tin on iron. 13. In which of these is current not conducted by electrons? A) Copper. B) Aluminium. C) Tap water. D) Mercury. Show Answer Correct Answer: C) Tap water. 14. Which of the following is not a conductor of electricity? A) Tap water. B) Salt water. C) Petrol. D) Lime juice. Show Answer Correct Answer: C) Petrol. 15. In an electrolyte, the current is due to the flow of A) Electrons. B) Positive ions. C) Both electrons and positive ions. D) Neither electrons nor positive ions. Show Answer Correct Answer: C) Both electrons and positive ions. 16. What symbol do we use for charge? A) A. B) W. C) Q. D) Z. Show Answer Correct Answer: C) Q. 17. The North pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the North pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was: A) Moving towards the solenoid. B) Moving into solenoid. C) At rest inside the solenoid. D) Moving out of the solenoid. Show Answer Correct Answer: D) Moving out of the solenoid. 18. Neutrons have a ..... charge. A) Neutral. B) Potiveive. C) Negative. D) None of the above. Show Answer Correct Answer: A) Neutral. 19. The SI unit of electric potential is A) Coulomb. B) Volts. C) Ampere. D) Ohms. Show Answer Correct Answer: B) Volts. 20. The commercial unit of electric energy is A) Kilowatt hour. B) Watt. C) Joule. D) Kilowatt. Show Answer Correct Answer: A) Kilowatt hour. 21. A straight wire of length 0.5m and carrying current 1.2A is placed in uniform magnetic field of induction 2T, applied perpendicular to the length of the wire. The force on the wire is A) 2.4 N. B) 1.2 N. C) 3.0 N. D) 2.0 N. Show Answer Correct Answer: B) 1.2 N. 22. The process of breaking up of an electrolyte chemically by passing an electric current is called A) Electroplating. B) Electro refining. C) Electrode. D) Electrolysis. Show Answer Correct Answer: D) Electrolysis. 23. For electric current to flow, do you need a closed or open circuit? A) Closed. B) Open. C) All the above. D) None of the above. Show Answer Correct Answer: A) Closed. 24. Electric fuse, when gets heated too much, breaks A) Electrical appliances. B) Electric current. C) Electric circuit. D) Short-circuit. Show Answer Correct Answer: C) Electric circuit. 25. An electromagnet does not attract a piece of iron A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. ← 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