This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A motor uses electricity to create magnetic fields A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. Which of the following is attracted by a magnet: A) Iron. B) Brass. C) Copper. D) Aluminium. Show Answer Correct Answer: A) Iron. 3. How does electric current affect substances like water and copper sulfate? A) Electric current can change the color of water and copper sulfate. B) Electric current can cause copper sulfate to evaporate. C) Electric current can turn water into solid ice. D) Electric current can cause electrolysis in water, separating it into hydrogen and oxygen gas. In the case of copper sulfate, the current can cause the deposition of copper metal on the electrode. Show Answer Correct Answer: D) Electric current can cause electrolysis in water, separating it into hydrogen and oxygen gas. In the case of copper sulfate, the current can cause the deposition of copper metal on the electrode. 4. The amount of heat produced in a wire depends on A) Material. B) Length. C) Thickness. D) All of these. Show Answer Correct Answer: D) All of these. 5. True/FalseOxygen is released at the side of cathode A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 6. The electrically charged atoms or group of atoms formed when a chemical compound is not dissolved in water are called ions. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 7. Which of the following is not an application of electrostatics? A) The photocopier. B) Defibrillator. C) Electric bell. D) From the Graaf Generator. Show Answer Correct Answer: C) Electric bell. 8. In which direction do electrons flow in circuit A) POsitive to negative. B) Negative to positive. C) Do not move. D) None of the above. Show Answer Correct Answer: B) Negative to positive. 9. The unit of resistivity in SI unit is ..... A) Ohm meter. B) Ametre. C) Voltmeter. D) Metre. Show Answer Correct Answer: A) Ohm meter. 10. The production of electricity from magnetism is called: A) Electrostatic induction. B) Electromagnetic induction. C) Current electricity. D) None of these. Show Answer Correct Answer: B) Electromagnetic induction. 11. The resistivity of alloy manganin is A) Nearly independent of temperature. B) Increases rapidly with increase in temperature. C) Decreases with increase in temperature. D) Increases rapidly with decrease in temperature. Show Answer Correct Answer: A) Nearly independent of temperature. 12. True or false:Sometimes magnets break into pieces that only show magnetism on one side (which is called a monopole). A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 13. LEDs full form is- A) Light Era Diode. B) Light Etern Dot. C) Light Emitting Dot. D) Light Emitting Diode. Show Answer Correct Answer: D) Light Emitting Diode. 14. On passing electricity through copper sulphate solution. A) Copper is formed at anode. B) Copper is formed at cathode. C) Oxygen is formed at anode. D) Hydrogen is formed at cathode. Show Answer Correct Answer: B) Copper is formed at cathode. 15. ..... is the the imaginary line joining the two poles A) Electricity. B) Magnetic axis. C) All the above. D) None of the above. Show Answer Correct Answer: B) Magnetic axis. 16. When one light bulb burns out, the rest stay lit. The bulbs must be found in ..... A) Series circuit. B) Parallel circuit. C) All the above. D) None of the above. Show Answer Correct Answer: B) Parallel circuit. 17. What is electrolysis? A) Electrolysis is the process of using a magnetic field to drive a chemical reaction. B) Electrolysis is the process of using heat to drive a chemical reaction. C) Electrolysis is the process of using an electric current to drive a non-spontaneous chemical reaction. D) Electrolysis is the process of using pressure to drive a chemical reaction. Show Answer Correct Answer: C) Electrolysis is the process of using an electric current to drive a non-spontaneous chemical reaction. 18. What advantage does an electromagnet have over a magnet? A) It can be switched on and off. B) It is stronger. C) It is easier to change shape. D) None of the above. Show Answer Correct Answer: A) It can be switched on and off. 19. What is an anion's charge? A) Positive. B) Negative. C) Neutral. D) Depends on the element's charge. Show Answer Correct Answer: B) Negative. 20. Electromagnets can be turned on and off by adding or removing electric current. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. What is the primary gas found in the Earth's atmosphere? A) Oxygen. B) Carbon Dioxide. C) Nitrogen. D) Hydrogen. Show Answer Correct Answer: C) Nitrogen. 22. What affects the density of water? A) Salt. B) Temperature. C) The seasons of the year. D) Both A and B. Show Answer Correct Answer: D) Both A and B. 23. Electric fuse is made of: A) Iron. B) Copper. C) Tin-lead alloy. D) None of these. Show Answer Correct Answer: C) Tin-lead alloy. 24. True or False:A fuse can be replaced by any piece of wire. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: A) False. 25. If the Voltage is increased and the resistance stays the same, Current will A) Increase. B) Decrease. C) Stay the same. D) X. Show Answer Correct Answer: A) Increase. ← 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