This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 31 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In making a battery(a) the positive terminal of one cell is connected to the negative terminal of the next cell(b) the positive terminal of one cell is connected to the positive terminal of the next cell(c) the negative terminal of one cell is connected to the negative terminal of the next cell(d) none of the above A) A. B) B. C) C. D) D. Show Answer Correct Answer: A) A. 2. If the current through the coil stops flowing. Will the coil remain an electromagnet? A) No. B) Yes. C) Maybe. D) Not sure. Show Answer Correct Answer: C) Maybe. 3. What would happen if you add more batteries to an electrical circuit containing light bulbs? A) No charge. B) The bulbs will dim. C) The bulbs will be brighter. D) The bulbs will last longer. Show Answer Correct Answer: C) The bulbs will be brighter. 4. In the bulb there is a thin wire called A) Light. B) Filament. C) Wire. D) Heater. Show Answer Correct Answer: B) Filament. 5. The direction of magnetic field is given by which of the following rule A) Maxwell Right Hand Rule. B) Maxwell Right Hand Thumb Rule. C) Fleming's Right Hand Rule. D) Fleming's Right Hand Thumb Rule. Show Answer Correct Answer: B) Maxwell Right Hand Thumb Rule. 6. Who discovered the relationship between electricity and magnetism? A) Hans Christian Oersted. B) Isaac Newton. C) Albert Einstein. D) Michael Faraday. Show Answer Correct Answer: A) Hans Christian Oersted. 7. The device used to make or break an electric circuit is A) Resistor. B) Battery. C) Switch. D) Ammeter. Show Answer Correct Answer: C) Switch. 8. When do we use a battery? A) When more energy is not required. B) When more energy than a single cell is required. C) When less energy than a single cell is required. D) When no energy is required. Show Answer Correct Answer: B) When more energy than a single cell is required. 9. Water containing which of the following substances may conduct electricity A) Salt. B) Sugar. C) All the above. D) None of the above. Show Answer Correct Answer: A) Salt. 10. Which wire would have more resistance? A) Long and thick. B) Short and thick. C) Long and thin. D) Short and thin. Show Answer Correct Answer: C) Long and thin. 11. What charge do protons have? A) Negative. B) Positive. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Positive. 12. Which of the following is most ecofriendly? A) Incandescent bulb. B) LED. C) CFL. D) None of the above. Show Answer Correct Answer: B) LED. 13. The ..... of the magnetic field is shown by the degree of closeness of the field lines. A) Relative strength. B) Strength. C) Total strength. D) Absolute strength. Show Answer Correct Answer: A) Relative strength. 14. The axis of Earth's magnet field is inclined with geographical axis at an angle of about: A) 25$^\circ$. B) 5$^\circ$. C) 15$^\circ$. D) 45$^\circ$. Show Answer Correct Answer: C) 15$^\circ$. 15. Chromium corrodes easily. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 16. Which of the following principles explains how an electric motor works? A) Magnetic force. B) Magnetism. C) Electrolysis. D) Electromagnetism. Show Answer Correct Answer: D) Electromagnetism. 17. What is the function of a dry cell? A) A conductor that connect the components together. B) A method of opening or closing the circuit. C) A source of electromotive force that drives electric charges around the circuit. D) A load in which moving charges can do a useful job. Show Answer Correct Answer: C) A source of electromotive force that drives electric charges around the circuit. 18. Waste from an electroplating factory must be disposed off A) In the nearby river. B) In the nearby pond. C) In the nearby cornfield. D) According to the disposal guidelines of Waste Management Bodies. Show Answer Correct Answer: D) According to the disposal guidelines of Waste Management Bodies. 19. An object through which electrons can easily flow is called a(n) ..... A) Conductor. B) Insulator. C) All the above. D) None of the above. Show Answer Correct Answer: A) Conductor. 20. What is full form of MRI? A) Magnetic Radiology Imaging. B) Magneto Ray Idometry. C) Medical Radiometer Instrument. D) Magnetic Resonance Imaging. Show Answer Correct Answer: D) Magnetic Resonance Imaging. 21. N a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should A) Decrease resistance in the main circuit. B) Increase resistance in the main circuit. C) Decrease resistance in series with the cell whose emf is to be measured. D) Increase resistance in series with the cell whose emf is to be determined. Show Answer Correct Answer: D) Increase resistance in series with the cell whose emf is to be determined. 22. Ocean currents transport matter and energy. Besides water, ocean currents also carry important matter such as ..... , ..... and ..... necesary for the survival of marine organisms. A) Fresh water, ice and warm water. B) Coconuts, plankton and sand dollars. C) Nitrogen, carbon dioxide, and oxygen. D) None of the above. Show Answer Correct Answer: C) Nitrogen, carbon dioxide, and oxygen. 23. Poor conductor of electricity A) Lemonade. B) Sea water. C) Glucose. D) Mineral water. Show Answer Correct Answer: C) Glucose. 24. You close the switch to turn on a device or to turn on a light.True or false A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 25. What is the use of electrolysis- A) Electroplating. B) Electrorefining. C) Production of metals and non metals. D) All of the above. Show Answer Correct Answer: D) All of the above. ← 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