This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 19 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The work done in moving the charge Q through a potential difference V A) Q/V. B) V/Q. C) QV. D) 1/QV. Show Answer Correct Answer: C) QV. 2. The difference in electrical potential energy between two charged bodies is called ..... A) Power. B) Voltage. C) Current. D) Charge. Show Answer Correct Answer: B) Voltage. 3. What is the driving force of the deep water ocean conveyor belt? A) Winds push the deep water into the Pacific and Indian oceans. B) Gravity from the moon pulls the water towards the equator. C) The spinning of Earth makes the deep water current run in circular paths. D) Very cold temperatures at the poles create very cold, salty water that pushes the deep water current. Show Answer Correct Answer: D) Very cold temperatures at the poles create very cold, salty water that pushes the deep water current. 4. The magnetic field around a current-carrying coil lasts. A) For three hours. B) As long as current flows through it. C) Till his half-period life. D) Field is permanent. Show Answer Correct Answer: B) As long as current flows through it. 5. A device used to measure the amount of electric current flowing through a circuit. A) Ammeter. B) Voltmeter. C) Resistor. D) Battery. Show Answer Correct Answer: A) Ammeter. 6. Which of the following substance is used to make an electromagnet: A) Aluminium. B) Copper. C) Soft iron. D) Steel. Show Answer Correct Answer: C) Soft iron. 7. When electric current flows through the metal filament of the bulb it gets heated to very high temperature and becomes ..... hot and start emitting ..... A) White, light. B) Red, light. C) White, heat. D) Red, heat. Show Answer Correct Answer: A) White, light. 8. Objects that have opposite charges A) Are attracted to each other, and the force between the objects pulls them together. B) Are attracted to each other, and the force between the objects pushes them apart. C) Are repelled by each other, and the force between the objects pulls them together. D) Are repelled by each other, and the force between the objects pushes them apart. Show Answer Correct Answer: A) Are attracted to each other, and the force between the objects pulls them together. 9. What are huge wheels that rotate when pushed by water, wind, or steam? A) Magnet wheels. B) Turbines. C) Batteries. D) Generators. Show Answer Correct Answer: B) Turbines. 10. Which of these particles are responsible for the flow of electric current? A) Electons. B) Protons. C) Neutrons. D) None of the above. Show Answer Correct Answer: A) Electons. 11. Good conductors are ..... resistors A) Bad. B) Good. C) All the above. D) None of the above. Show Answer Correct Answer: A) Bad. 12. The unit of what is named oersted in honour of Hans Oersted A) Magnetic field strength. B) Magnetic field. C) Magnetism. D) Electromagnetism. Show Answer Correct Answer: A) Magnetic field strength. 13. Which of the given statements is incorrect regarding magnetic field lines? A) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points. B) Magnetic field lines are closed curves. C) If magnetic field lines are parallel and equidistant, they represent zero field strength. D) Relative strength of magnetic field is shown by the degree of closeness of the field lines. Show Answer Correct Answer: C) If magnetic field lines are parallel and equidistant, they represent zero field strength. 14. Which of the property a proton can change, when it moves freely in a magnetic field: A) Charge. B) Velocity. C) Mass. D) None of these. Show Answer Correct Answer: B) Velocity. 15. Who discovered heating effect of elecric current? A) James Watt. B) Joule-Lence. C) Michael Faraday. D) Thomas Edison. Show Answer Correct Answer: B) Joule-Lence. 16. Circuit breaker device which can be used in place of fuse in domestic electric wiring is called:- A) MCB. B) CCB. C) MCD. D) None of these. Show Answer Correct Answer: A) MCB. 17. Boojho's uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory A) In the nearby river. B) In the nearby pond. C) In the nearby cornfield. D) According to the disposal guidelines of the local authority. Show Answer Correct Answer: D) According to the disposal guidelines of the local authority. 18. Drift velocity is A) The average velocity with which the electrons are drifted towards the positive terminal of the battery. B) Velocity of an electron in a conductor. C) Average thermal velocity. D) None of these. Show Answer Correct Answer: A) The average velocity with which the electrons are drifted towards the positive terminal of the battery. 19. The D.C. motor works on the principle of:(a)Heating effect of current (b)Chemical effect of current (c)Magnetic effect of current (d)None of these A) Heating effect of current. B) Chemical effect of current. C) Magnetic effect of current. D) None of these. Show Answer Correct Answer: A) Heating effect of current. 20. Which dude discovered that current in a wire caused adeflection in a magnetic compass? A) Tesla. B) Faraday. C) Maxwell. D) Oasted. Show Answer Correct Answer: D) Oasted. 21. If a light bulb is added to a circuit and it turns on, what can we say about this circuit? A) Open. B) Incomplete. C) Unbroken. D) Off. Show Answer Correct Answer: C) Unbroken. 22. Who discovered the Heating Effect of electric current? A) Hans Christian Oersted. B) James Prescott Joule. C) Blaise Pascal. D) Galileo Galilei. Show Answer Correct Answer: B) James Prescott Joule. 23. What is static electricity caused by? A) A balance of power. B) A balance of positive and negative charges. C) . An imbalance of positive and negative charges. D) An imbalance of protons and neutrons. Show Answer Correct Answer: C) . An imbalance of positive and negative charges. 24. Give an example of a substance that undergoes a chemical change due to the effect of electric current. A) Water. B) Salt. C) Sugar. D) Oxygen. Show Answer Correct Answer: A) Water. 25. Out of the following, which metal is used to electroplate iron to make it shining and rust resistant? A) Gold. B) Chromium. C) Zinc. D) Tin. Show Answer Correct Answer: B) Chromium. ← 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