This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 37 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 37 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Carbon is The only non-metal material that can conduct electricity. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. The magnetic strength of a conductor decreases with the increase in current A) True. B) False. C) None of the above. D) None of the above. Show Answer Correct Answer: B) False. 3. An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance. A) 240 Ohms. B) 60 Ohms. C) $\frac{1}{240}$. D) 180 Ohms. Show Answer Correct Answer: A) 240 Ohms. 4. During electrolysis the positively charged ions travel towards Cathode. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. In the process of electroplating, pure copper rod is connected to ..... terminal of the battery. A) Positive. B) Negative. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Positive. 6. How does electric current affect the chemical composition of a substance? A) It can change the color of the substance. B) It can cause chemical reactions to occur, leading to changes in the substance's chemical composition. C) It has no effect on the chemical composition. D) It can make the substance taste sweeter. Show Answer Correct Answer: B) It can cause chemical reactions to occur, leading to changes in the substance's chemical composition. 7. Which of the following cannot be harmed by current A) Plastic. B) Rubber. C) All of the above. D) None of the above. Show Answer Correct Answer: C) All of the above. 8. What energy transformation takes place in a battery powered fan that is spinning? A) Kinetic to chemical to electrical. B) Chemical to kinetic. C) Chemical to electrical to kinetic. D) Electrical to kinetic to chemical. Show Answer Correct Answer: C) Chemical to electrical to kinetic. 9. Fill in the blank:CFLs and fluorescent tubes contain ..... A) H$_{2}$SO$_{4}$. B) Carbon vapour. C) Mercury vapour. D) Nitrogen oxide. Show Answer Correct Answer: C) Mercury vapour. 10. A light bulb is an example of a ..... A) Current. B) Resistor. C) Battery. D) None of the above. Show Answer Correct Answer: B) Resistor. 11. Why is it necessary to have a continuous flow of electricity during electrolysis? A) To prevent the formation of unwanted byproducts. B) To create a magnetic field for better separation of ions. C) To increase the temperature of the electrolyte for faster reactions. D) To provide a constant supply of electrons for the reduction and oxidation reactions. Show Answer Correct Answer: D) To provide a constant supply of electrons for the reduction and oxidation reactions. 12. Which of these is a good conductor of electricity? A) Wood. B) Alcohol. C) Milk. D) None of the above. Show Answer Correct Answer: C) Milk. 13. Which of these characteristics will produce the most dense water? A) High salinity, high temperature. B) High salinity, low temperature. C) Low salinity, high temperature. D) Low salinity, low temperature. Show Answer Correct Answer: B) High salinity, low temperature. 14. An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on the: A) Speed of magnet with which it moves. B) Number of turns in the coil. C) Resistivity of the wire used in coil. D) The intensity of magnetic field in which coil is moved. Show Answer Correct Answer: C) Resistivity of the wire used in coil. 15. Electrical device has ..... terminals A) 4. B) 3. C) 2. D) None of the above. Show Answer Correct Answer: C) 2. 16. To electroplate an iron nail with copper, we connect the nail to the ..... electrode A) Positive. B) Negative. C) Any one. D) None of these. Show Answer Correct Answer: B) Negative. 17. What does magnets repelling mean? A) Magnets move away from each other. B) Magnets do not have magnetism. C) Magnets move towards each other. D) None of the above. Show Answer Correct Answer: A) Magnets move away from each other. 18. Which of the following is not an effect of electric current? A) Heating Effect of electric current. B) Colour Changing Effect of electric current. C) Magnetic Effect of electric current. D) None of the above. Show Answer Correct Answer: B) Colour Changing Effect of electric current. 19. In an electric bell, which of these gets attracted to the electromagnet? A) The hammer. B) The soft iron strip. C) The screw. D) None of these. Show Answer Correct Answer: B) The soft iron strip. 20. Which statement describes how deposition builds up the surface of a floodplain? A) Lava flows from a volcano and piles up. B) Rainwater seeps into the ground and freezes. C) A river flows over its banks and slows down. D) A river slows down as it flows into the ocean. Show Answer Correct Answer: D) A river slows down as it flows into the ocean. 21. If the current increases it could be because of ..... A) Increasing voltage. B) Decreasing resistance. C) Both. D) None of the above. Show Answer Correct Answer: C) Both. 22. The shock you sometimes feel when you touch a metal doorknob on a dry day is electric ..... A) Circuit. B) Current. C) Discharge. D) Resistance. Show Answer Correct Answer: C) Discharge. 23. Current consisting of charges that move back and forth in a circuit A) Alternating current. B) Direct current. C) Parallel current. D) Electric current. Show Answer Correct Answer: A) Alternating current. 24. If an object has the same number of positive and negative charges, its electrical charge is ..... A) Positive. B) Negative. C) Neutral or no charge. D) Opposite. Show Answer Correct Answer: C) Neutral or no charge. 25. Differences in water temperature create movement in the Ocean because A) Bodies of water at different temperature have different densities. B) Warm water is pulled more by the force of gravity then cold water is. C) Warm and cold water mix until they reach the same temperature. D) The ocean just likes to "move-it move-it" . Show Answer Correct Answer: A) Bodies of water at different temperature have different densities. ← 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