This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 38 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 38 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What are insulators and how do they differ from conductors? A) Insulators and conductors have the same properties. B) Insulators are materials that do not allow the flow of electricity, while conductors are materials that allow the flow of electricity. C) Conductors are materials that do not allow the flow of electricity. D) Insulators are materials that enhance the flow of electricity. Show Answer Correct Answer: B) Insulators are materials that do not allow the flow of electricity, while conductors are materials that allow the flow of electricity. 2. Two south magnetic poles that are brought near each other ..... A) Attract. B) Shake hands. C) Thumb wrestle. D) Repel. Show Answer Correct Answer: D) Repel. 3. Coil of wire in room heater is called A) Filament. B) Element. C) Connecting wire. D) None of these. Show Answer Correct Answer: B) Element. 4. The magnetic field around a current carrying coil A) Lasts for three hours. B) Lasts as long as current flows through it. C) Lasts till its half-life period. D) Is permanent. Show Answer Correct Answer: B) Lasts as long as current flows through it. 5. The force exerted on a current carrying wire placed in a magnetic field is 0 when angle between the wire and the direction of magnetic field is: A) 30$^\circ$. B) 180$^\circ$. C) 60$^\circ$. D) 90$^\circ$. Show Answer Correct Answer: B) 180$^\circ$. 6. The more rolls of wire on iron screw, lesser pins will attract A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 7. Which are not the effect of an electric current? A) Heating effect. B) Lightning effect. C) Magnetic effect. D) Electrical effect. Show Answer Correct Answer: D) Electrical effect. 8. The colour of insulation of earth wire is: A) Green. B) Red. C) White. D) White. Show Answer Correct Answer: A) Green. 9. In an incandescent bulb, electric current passes through a very thin wire made of a special material. It is A) Alloy. B) Tungsten. C) Brass. D) Plastic. Show Answer Correct Answer: B) Tungsten. 10. Which of the devices use a battery? A) Torch. B) Transistor. C) TV Remote. D) All of these. Show Answer Correct Answer: D) All of these. 11. When the switch is on the circuit from the positive to negative terminal is complete A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. Who discovered bulb? A) Ohm. B) Michael Faraday. C) Flemming. D) Thomas Edison. Show Answer Correct Answer: D) Thomas Edison. 13. What glows even when a weak electric current passes through it? A) CFL. B) LED. C) Bulb. D) Tube light. Show Answer Correct Answer: B) LED. 14. What is the density of a piece of floating wood? A) 0.5 g / cm3. B) 7.2 g / cm3. C) 1.0 g / cm3. D) 100 g / cm3. Show Answer Correct Answer: A) 0.5 g / cm3. 15. A fuse wire is a wire of- A) High resistivity and low melting point. B) High resistivity and high melting point. C) Low resistivity and low melting point. D) Low resistivity and high melting point. Show Answer Correct Answer: B) High resistivity and high melting point. 16. What is the cause of the magnetic field around a current-carrying conductor? A) Electric field. B) Magnetic charges. C) Flow of electrons. D) Gravitational force. Show Answer Correct Answer: C) Flow of electrons. 17. Which of the following produces most heat? A) Long and thick wire. B) Long and thin wire. C) Short and thick wire. D) Short and thin wire. Show Answer Correct Answer: C) Short and thick wire. 18. Properties of chromium include: A) Shiny appearance. B) Does not corrode. C) Resists scratches. D) All of these. Show Answer Correct Answer: D) All of these. 19. A vertical wire carrying a current in the upward direction is placed in a horizontal magnetic field directed towards north. The wire will experience a force directed towards A) East. B) West. C) North. D) South. Show Answer Correct Answer: B) West. 20. The process of making magnet substance into a magnet is known as A) Magnetization. B) Magnet. C) All the above. D) None of the above. Show Answer Correct Answer: A) Magnetization. 21. Without the Gulf Stream, the southeastern United States and Europe would be ..... A) Warmer. B) Cooler. C) All the above. D) None of the above. Show Answer Correct Answer: B) Cooler. 22. Which of the following is the example of magnetic effect of electric current A) Electric Bell. B) Crane. C) All of these. D) None Of these. Show Answer Correct Answer: C) All of these. 23. A battery is the term used for a group of: A) Cells. B) Voltages. C) Positive electrodes. D) Negative electrodes. Show Answer Correct Answer: A) Cells. 24. The D.C. generator is based on the principle of: A) Electrostatic induction. B) Electromagnetic induction. C) Electrochemical induction. D) None of these. Show Answer Correct Answer: B) Electromagnetic induction. 25. The electrical charge created by rubbing two surfaces together is called: A) Moving electricity. B) Static electricity. C) Piezo-electric crystal electricity. D) Photo-voltaic electricity. Show Answer Correct Answer: B) Static electricity. ← 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