This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Current is related to the drift velocity A) Current is directly proportional to the drift velocity. B) Current is inversely proportional to drift velocity. C) Current does not depend upon the drift velocity. D) Current it depends on the the square of drift velocity. Show Answer Correct Answer: A) Current is directly proportional to the drift velocity. 2. When too much electric current flows through an object, the object can heat up. What might this cause? A) Your computer will turn on. B) A fire. C) The circuit to open. D) Carry information from the brain. Show Answer Correct Answer: B) A fire. 3. What are incandescent bulbs? A) Bulbs with mercury vapour. B) Bulbs tungsten filament. C) Bulbs with light emitting diodes. D) None of the above. Show Answer Correct Answer: B) Bulbs tungsten filament. 4. A ..... is a safety device which prevents damage to electrical circuits and possible fires A) MCB. B) Fuse. C) Switch. D) Car Key. Show Answer Correct Answer: B) Fuse. 5. A type of magnet that has temporary magnetic effect when electric current flows through it.This refer to A) Electric. B) Electronic. C) Electrostatic. D) Electromagnet. Show Answer Correct Answer: D) Electromagnet. 6. What are conductors and insulators? A) Conductors are used to control traffic, while insulators are used for soundproofing. B) Conductors are used in jewelry making, while insulators are used in gardening. C) Conductors are used in cooking, while insulators are used in construction. D) Conductors allow the flow of electric current, while insulators do not. Show Answer Correct Answer: D) Conductors allow the flow of electric current, while insulators do not. 7. Which one of the following elements is always required in an electric circuit? A) Switch. B) Connecting wires. C) Voltmeter. D) Ammeter. Show Answer Correct Answer: B) Connecting wires. 8. Which statement about vertebrates is true? A) Vertebrates have skeletons. B) Vertebrates live only on land. C) Most animals are vertebrates. D) Vertebrates do not have backbones. Show Answer Correct Answer: A) Vertebrates have skeletons. 9. Fuse works based on the A) Heating effect of electric current. B) Magnetic effect of electric current. C) Lighting effect of electric current. D) None of the above. Show Answer Correct Answer: A) Heating effect of electric current. 10. The hammer is attatched to the ..... which in turn strikes the ..... A) Gong; Iron strip. B) Iron Strip; Gong. C) Electromagnet; Switch. D) Switch; Iron Strip. Show Answer Correct Answer: B) Iron Strip; Gong. 11. The rate at which electric energy is dissipated or consumed in an electric circuit is caleed A) Electric Potential. B) Electric Resistance. C) Electric Power. D) Electric Energy. Show Answer Correct Answer: C) Electric Power. 12. Plastic wire is A) Conductor. B) Insulator. C) Both of these. D) None of these. Show Answer Correct Answer: B) Insulator. 13. Which is a better conductor of electricity? A) Electrolytes. B) Metals. C) Non metals. D) None of these. Show Answer Correct Answer: B) Metals. 14. A student is hiking on a summer day. She sees pieces of rock fall down a cliff. Which process MOST LIKELY occurred? A) Erosion by water. B) Weathering by ice. C) Erosion by gravity. D) Deposition by wind. Show Answer Correct Answer: C) Erosion by gravity. 15. Key or switch in circuit is placed A) On the left side of the battery. B) On the right side of the battery. C) Anywhere in the circuit. D) Near the positive terminal of the bulb. Show Answer Correct Answer: C) Anywhere in the circuit. 16. Which one of the following is the most energy efficient A) LED. B) Incandescent bulb. C) CFL. D) None of the above. Show Answer Correct Answer: A) LED. 17. Resistance is measured in ..... A) Watts. B) Amps. C) Ohms. D) Volt. Show Answer Correct Answer: C) Ohms. 18. The electrode connected to the negative terminal of a battery is known as A) Anode. B) Negative pole. C) Cathode. D) Electrolyte. Show Answer Correct Answer: C) Cathode. 19. Arrangement is used to increase the resistance in a circuit. A) Resistors connected in parallel. B) Resistors connected in series. C) Resistors connected in alternate. D) Resistors connected in combination. Show Answer Correct Answer: B) Resistors connected in series. 20. Electricity produces ..... effect A) Magnetic. B) Electric. C) Both. D) No. Show Answer Correct Answer: C) Both. 21. Electric ..... can travel long distances A) Circuits. B) Currents. C) Amperes. D) Voltages. Show Answer Correct Answer: B) Currents. 22. Which of the following devices does not work on heating effect of current? A) Electric bulb. B) Fuse. C) Electric bell. D) Immersion rod. Show Answer Correct Answer: C) Electric bell. 23. Why Nichrome is used for making wires of heating coils? A) 1.High melting point and low resistivity. B) 2.Low resistivity and high melting point. C) 3.High resistivity and high melting point. D) 4. It can get oxidised easily and have high melting point. Show Answer Correct Answer: C) 3.High resistivity and high melting point. 24. Conductors can allow electricity because of the presence of A) Free ions. B) Free electrons. C) Free protons. D) Atoms. Show Answer Correct Answer: B) Free electrons. 25. Electric circuit is a path for transmitting electric current A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. ← 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