This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 34 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 34 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The movement of deep, cold, nutrient filled water to the surface of the ocean is ..... A) Ocean Current. B) Upwelling. C) Deep Currents. D) Surface Currents. Show Answer Correct Answer: B) Upwelling. 2. A magnetic field line is used to find the direction of: A) South-north. B) A compass needle. C) A bar magnet. D) Magnetic field. Show Answer Correct Answer: D) Magnetic field. 3. Which of the following statements is correct about conductor and insulator? A) The electrons in conductor do not move around. B) The electrons in insulator do not move around. C) The electric current can pass through the insulator. D) The electric current can pass through both insulator and conductor. Show Answer Correct Answer: B) The electrons in insulator do not move around. 4. Current rating of a fuse wire in a circuit having bulb and tubes is: A) 2 A. B) 3 A. C) 4 A. D) 5 A. Show Answer Correct Answer: D) 5 A. 5. What is the region of force around a magnet known as? A) Magnetic field. B) Magnetic pole. C) Magnetic domain. D) Lodestone. Show Answer Correct Answer: A) Magnetic field. 6. The magnetic effect of current was discovered by A) Maxwell. B) Fleming. C) Oasted. D) Faraday. Show Answer Correct Answer: C) Oasted. 7. Electric current can flow through a wire only if it forms a ..... A) Open Loop. B) Closed Loop. C) All the above. D) None of the above. Show Answer Correct Answer: B) Closed Loop. 8. The symbol for 1 ..... is A A) Acceleration. B) Current. C) Ampere. D) Coulomb. Show Answer Correct Answer: C) Ampere. 9. Which of the following liquids conducts the least amount of electricity? A) Salt Water. B) Water. C) Vinegar. D) Lemon Juice. Show Answer Correct Answer: B) Water. 10. Which one has less resistance? A) Conductors of electricity. B) Poor conductors of electricity. C) All the above. D) None of the above. Show Answer Correct Answer: A) Conductors of electricity. 11. If you turn on all of the lights in your house, the electric meter measuring Kilowatt-hours outside your home will read a ..... value than if the lights are off. A) Higher. B) Lower. C) All the above. D) None of the above. Show Answer Correct Answer: A) Higher. 12. The filament of the bulb gets heated to a high temperature due to the A) Magnetic effect of current. B) Heating effect of current. C) Chemical effect of current. D) All of these. Show Answer Correct Answer: B) Heating effect of current. 13. In the process of electroplating, the positive ion of the ionised solution gets attracted towards A) The positive terminal. B) The negative terminal. C) Both the terminals. D) Neither of the terminals. Show Answer Correct Answer: B) The negative terminal. 14. Describe the process of corrosion and its impact on metals. A) Corrosion is a beneficial process that strengthens metals over time. B) Corrosion only affects non-ferrous metals. C) Corrosion has no impact on the structural integrity of metals. D) Corrosion is a natural process that deteriorates metals by chemical or electrochemical reactions with their environment, leading to structural weakening and potential failure. Show Answer Correct Answer: D) Corrosion is a natural process that deteriorates metals by chemical or electrochemical reactions with their environment, leading to structural weakening and potential failure. 15. The type of energy converted to electrical energy by a photo-voltaic cell is: A) Light energy. B) Heat energy. C) Mechanical energy. D) Wind energy. Show Answer Correct Answer: A) Light energy. 16. A current carrying conductor behaves like a magnet A) Till the current is flowing throuhg it. B) Even though current is not passing. C) None of the above. D) None of the above. Show Answer Correct Answer: A) Till the current is flowing throuhg it. 17. Pure or distilled water is a A) Poor conductor. B) Good conductor. C) Both. D) None of the above. Show Answer Correct Answer: A) Poor conductor. 18. An electric heater of resistance 8 $\Omega$ draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater A) 1800 watt. B) 1800 joule. C) 3600 joule. D) 3600 watt. Show Answer Correct Answer: A) 1800 watt. 19. What kind of process don't go when observe the chemical effect of electric current A) Formation of gas bubbles at the electrodes. B) Deposit of metal on the electrodes. C) Electric motor begin to move. D) Change in colour of the solution. Show Answer Correct Answer: C) Electric motor begin to move. 20. ..... is the opposition of a material to the flow of electric current. A) Resistance. B) Current. C) Static. D) Electricity. Show Answer Correct Answer: A) Resistance. 21. Which of the following is not a reason for excessive currents in electrical circuits? A) Direct touching of wires. B) Short circuiting. C) Switch in 'off position. D) Overloading. Show Answer Correct Answer: C) Switch in 'off position. 22. STATE WHETHER TRUE OF FALSE It is convenient to represent electric components by symbols. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 23. If the filament of one bulb fuses, rest of the circuit still remains operational. (Identify the circuit) A) Series. B) Parallel. C) All the above. D) None of the above. Show Answer Correct Answer: B) Parallel. 24. The cyclotron frequency of an electron gyrating in a magnetic field of 1 T is: A) 28 MHz. B) 280 MHz. C) 2.8 GHz. D) 28 GHz. Show Answer Correct Answer: D) 28 GHz. 25. What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current? A) 12 V. B) 21 V. C) 4/3 V. D) 3/4 V. Show Answer Correct Answer: A) 12 V. ← 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