This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If in a circuit diagram containing a cell and nichrome wire tied between two nails, the cell is replaced by a battery then what will happen to the nichrome wire? A) It gets red hot slowly. B) No change in the temperature take place. C) It will get red hot quickly. D) The wire will break due to increase in strength of current. Show Answer Correct Answer: C) It will get red hot quickly. 2. Materials which do not allow electricity to flow through it. A) Insulators. B) Conductors. C) None. D) None of the above. Show Answer Correct Answer: A) Insulators. 3. This is the formula for the effective resistance connected in ..... Rs = R1+ R2+ R3+ R4 ..... Rn. A) Resisteres connected in series. B) Resisteres connected in parallel. C) All the above. D) None of the above. Show Answer Correct Answer: A) Resisteres connected in series. 4. The continuous flow of electric charges through a material A) Electric current. B) Electric circuit. C) Voltage. D) Parallel circuit. Show Answer Correct Answer: A) Electric current. 5. If the voltage stays the same, but the resistance goes up, the current will ..... A) Increase (speed up). B) Decrease (slow down). C) Stay the same. D) None of the above. Show Answer Correct Answer: B) Decrease (slow down). 6. Heating effect of electric current is used in A) Checking temperature. B) Pan. C) Room heaters. D) None of the above. Show Answer Correct Answer: C) Room heaters. 7. Which one of the following solutions will not conduct electricity? A) Lemon juice. B) Vinegar. C) Tap water. D) Toothpaste. Show Answer Correct Answer: D) Toothpaste. 8. SI unit of current is ammeter. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 9. What happens to a current when it comes in contact with a continent or landmass? A) It continues over the continent. B) It stops. C) It changes direction. D) It is absorbed by the land. Show Answer Correct Answer: C) It changes direction. 10. What is the full form of the ISI mark? A) Indian standard institution. B) India standards institutions. C) Indian Standards institution. D) None of the above. Show Answer Correct Answer: C) Indian Standards institution. 11. The electrode that contains the plating metal A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: A) Anode. 12. Two types of water currents are A) Local and global. B) Sea and land. C) Surface and deep. D) Warm and cold. Show Answer Correct Answer: C) Surface and deep. 13. Wood, plastic, and rubber are ..... A) Conductors. B) Isulators. C) Collide. D) Homogeneous. Show Answer Correct Answer: B) Isulators. 14. Assertion-Only Iron is used for making electromagnets. Reason-Iron behaves as a magnet. A) Assertion is false and reason is true. B) Both are false. C) Assertion is true but the reason is not the correct explanation of assertion. D) Assertion is true and reason is the correct explanation of assertion. Show Answer Correct Answer: C) Assertion is true but the reason is not the correct explanation of assertion. 15. An electrolyte is A) A metal. B) A solution. C) A liquid that conducts current. D) All of the above. Show Answer Correct Answer: C) A liquid that conducts current. 16. Identify the element that is required for making the filament in bulbs? A) Silver. B) Copper. C) Aluminium. D) Tungsten. Show Answer Correct Answer: D) Tungsten. 17. Magnetic effect of electric current was invented by A) Coulomb. B) Oasted. C) Joule. D) None of the above. Show Answer Correct Answer: B) Oasted. 18. Daniel wanted to gift a silver plated spoon to his mother. He used the technique of electroplating for this purpose. Which end of the battery should the spoon be connected to? A) Positive. B) Negative. C) Doesn't matter. D) None of the above. Show Answer Correct Answer: B) Negative. 19. Which mark is necessary on electric appliances? A) AGMARK. B) ISI. C) FICCI. D) KSK. Show Answer Correct Answer: B) ISI. 20. Joe set up an electrical circuit to determine whether certain materials would conduct electricity. Which of these items would complete Joe's circuit? A) A metal pin. B) A plastic bag. C) A rubber ball. D) A wooden block. Show Answer Correct Answer: A) A metal pin. 21. Electric ..... can flow through metals A) Light energy. B) Current. C) Correct. D) None. Show Answer Correct Answer: B) Current. 22. Allows electricity to flow through them A) Conductors. B) Insulators. C) None. D) None of the above. Show Answer Correct Answer: A) Conductors. 23. An electric component used as a safety device in electric circuit is A) Switch. B) Fuse. C) Cell. D) Electric wires. Show Answer Correct Answer: B) Fuse. 24. What is a switch's function in a circuit? A) To make the current hotter or colder. B) Turn on and off the flow of current. C) The pathway that current flows. D) To add more power to the circuit. Show Answer Correct Answer: B) Turn on and off the flow of current. 25. What device changes electrical energy to mechanical energy? A) Electromagnet. B) Electric motor. C) Conductor. D) Generator. Show Answer Correct Answer: B) Electric motor. 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