This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is open circuit A) Switch in OFF position. B) Bulb not glowing. C) Disconnected wire. D) All of these. Show Answer Correct Answer: D) All of these. 2. Filament of a bulb is usually made up of A) Nickel. B) Chromium. C) Cobalt. D) Tungsten. Show Answer Correct Answer: D) Tungsten. 3. Iron is used in bridges and automobiles to provide strength, however, iron tends to corrode and rust, so a coating of ..... is deposited on iron to protect it from corrosion and formation of rust. A) Tin. B) Bronze. C) Zinc. D) None of these. Show Answer Correct Answer: C) Zinc. 4. During electroplating, why should the salt solution be the same metal as the metal to be coated? A) To replace the lost metal ions from the solution. B) To make sure that the balance is maintained in the solution. C) None of them. D) Both of them. Show Answer Correct Answer: D) Both of them. 5. How much work is done in moving a charge of 2 Coulomb across two points having a potential difference of 12 Volt A) 14 J. B) 24 J. C) 6 J. D) 10 J. Show Answer Correct Answer: B) 24 J. 6. The strength of the magnetic field is directly proportional to magnitude of electric current A) False. B) True. C) Can't say. D) None of the above. Show Answer Correct Answer: B) True. 7. When the switch is in the 'ON' position, the electric circuit is said to be A) Closed. B) Open. C) Complete. D) Both closed and complete. Show Answer Correct Answer: D) Both closed and complete. 8. Electrical energy is created by the conversion of other forms of energy. A) True. B) False. C) Only on a sunny day. D) None of the above. Show Answer Correct Answer: A) True. 9. What are some common methods used for corrosion prevention? A) Protective coatings, corrosion-resistant alloys, cathodic protection, proper design. B) Regular maintenance, sacrificial anodes, high humidity levels. C) All the above. D) None of the above. Show Answer Correct Answer: A) Protective coatings, corrosion-resistant alloys, cathodic protection, proper design. 10. Organisms such as ..... , ..... , and ..... rely on ocean currents for transportation. A) Sea turtles, coconut trees, and plankton. B) Oxygen, nitrogen and carbon. C) Thermal and kinetic energy. D) Fish, kelp, sea otters. Show Answer Correct Answer: A) Sea turtles, coconut trees, and plankton. 11. Which of the following is an application of electroplating. A) Electrorefining of metal. B) Extraction of metals from its ores. C) To minimize the cost. D) None of these. Show Answer Correct Answer: C) To minimize the cost. 12. Copper wires are used as connecting wires because A) Copper has very high melting point. B) Copper wires are very thick wires. C) Copper wires offer a lower resistance. D) None of these. Show Answer Correct Answer: C) Copper wires offer a lower resistance. 13. An eletric cell has ..... terminals A) Three. B) Five. C) Ten. D) Two. Show Answer Correct Answer: D) Two. 14. Electromagnets could be used in particular devices A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: B) FALSE. 15. Most cores are made of ..... A) Iron. B) Copper. C) Aluminum. D) Wood. Show Answer Correct Answer: A) Iron. 16. In a stereo amplifier circuit, there is a resistor across which you measure 25V, and your ammeter indicates 50mA of current through the resistor. What is the resistor's value in kilohms? In ohms? A) 2k, 20th. B) 0.5k, 500h. C) 1.25k, 1250 o'clock. D) None of the above. Show Answer Correct Answer: B) 0.5k, 500h. 17. The energy transferred per unit charge is called A) Potential difference. B) Current. C) Kinetic energy. D) Electrical energy. Show Answer Correct Answer: A) Potential difference. 18. What is an electromagnet? A) A temporary magnet made from current carrying wire around a magnetic metal core. B) A permanent magnet with a north and south pole. C) All the above. D) None of the above. Show Answer Correct Answer: A) A temporary magnet made from current carrying wire around a magnetic metal core. 19. Which scientist suggested that the magnet must also exert an equal and opposite force on the current? A) Andre Marie Ampere. B) His Oersted. C) Michael Faraday. D) Alessandro Volta. Show Answer Correct Answer: A) Andre Marie Ampere. 20. The magnetic field lines along a straight current carrying conductor. A) Concentric Circles. B) Simple Circle. C) Straight line. D) None of the one. Show Answer Correct Answer: A) Concentric Circles. 21. When current flows through a conducting solution than the electrode connected to the negative terminal of the battery is called: A) Anode. B) Cathode. C) Rod. D) None of these. Show Answer Correct Answer: B) Cathode. 22. An object becomes postiively charged when which of the following occurs? A) Loses electrons. B) Gains electrons. C) Loses protons. D) Gains neutrons. Show Answer Correct Answer: A) Loses electrons. 23. Electric bell has A) Motor. B) Permanent magnet. C) Electromagnet. D) None of the above. Show Answer Correct Answer: C) Electromagnet. 24. Substances through which electric charges flow easily are called A) Wire. B) Metal. C) Conductors. D) Insulators. Show Answer Correct Answer: C) Conductors. 25. When the electric current passes through fuse exceeds a certain limit, the fuse wire melts and breaks A) Ture. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) Ture. ← 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 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 10Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books