This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 25 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 25 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which word best fits this definition:the contacts between the armature and the source of power in a motor. A) Electromagnet. B) Ferromagnetic. C) Force fie3ld. D) Brushes. Show Answer Correct Answer: D) Brushes. 2. Heating effect is used in A) Room heater. B) Electric fuse. C) Geyser. D) All of these. Show Answer Correct Answer: D) All of these. 3. What is the SI unit of electric current? A) Watts. B) Voltage. C) Joules. D) Ampere. Show Answer Correct Answer: D) Ampere. 4. How does electric current affect substances like water and copper sulphate? A) It causes freezing of water and evaporation of copper sulphate. B) It causes boiling of water and dissolution of copper sulphate. C) It causes electrolysis in water and deposition of copper metal in copper sulphate. D) It causes combustion of water and sublimation of copper sulphate. Show Answer Correct Answer: C) It causes electrolysis in water and deposition of copper metal in copper sulphate. 5. The direction of force on a current carrying conductor is given by: A) Ampere's swimming rule. B) Right handed screw rule. C) Coulomb's law. D) Fleming's left hand rule. Show Answer Correct Answer: D) Fleming's left hand rule. 6. Electric fuse breaks when A) Low current passes. B) More current passes. C) Current is passing constant. D) None of the above. Show Answer Correct Answer: B) More current passes. 7. Bicycle bells and wheel rims are electroplated with which metal? A) Tin. B) Nickle. C) Chromium. D) Silver. Show Answer Correct Answer: C) Chromium. 8. The negatively charged electrode is called the ..... A) Anode. B) Cathode. C) All the above. D) None of the above. Show Answer Correct Answer: B) Cathode. 9. Why the magnetic field lines never intersect. A) The magnetic compass needle will show two directions. B) The magnetic field lines will two directions. C) The lines which are used to represent magnetic field lines on paper will intersect and show two directions. D) No direction will be shown. Show Answer Correct Answer: A) The magnetic compass needle will show two directions. 10. Ken wanted to make a light bulb glow. Which set of materials would he need? A) Paper cup, paper clip, and a popsicle stick. B) Battery, wire, and light bulb. C) Button, cell battery, and rubber glove. D) Cell battery, paper, and bulb. Show Answer Correct Answer: B) Battery, wire, and light bulb. 11. What are the 2 effects of electricity? A) A.Heating effect, water effect. B) B.Magnetic effect, Heating effect. C) Water effect, Magnetic effect. D) None of the above. Show Answer Correct Answer: B) B.Magnetic effect, Heating effect. 12. The movement of electrically charged ..... is called electric ..... A) Particles, transport. B) Ions, current. C) Particles, current. D) Ions, transport. Show Answer Correct Answer: C) Particles, current. 13. Does friction cause heat? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 14. Electrical current DOES NOT flow in A) An open circuit. B) A closed circuit. C) An electromagnet. D) A complete circuit. Show Answer Correct Answer: A) An open circuit. 15. How many terminals do each cell have? A) 3. B) 4. C) 2. D) None of the above. Show Answer Correct Answer: C) 2. 16. What unit do we measure time in? A) Metres (m). B) Amperes/Amps (A). C) Seconds (s). D) Coulombs (C). Show Answer Correct Answer: C) Seconds (s). 17. A current-carrying wire of length 50 cm ispositioned perpendicular to a uniform magnetic field.If the current is 10.0 A and it is determined that thereis a resultant force of 3.0 N on the wire due to theinteraction of the current and field, what is themagnetic field strength? A) 6.7 E-3 T. B) 1.8 E-3 T. C) 0.6 T. D) 1.5 T. Show Answer Correct Answer: C) 0.6 T. 18. One Coulomb charge is equivalent to the charge contained in A) 2.6 x 10$^{19 }$elecrons. B) 6.2 x 10$^{19}$ elecrons. C) 2.65 x 10$^{18 }$elecrons. D) 6.25 x 10$^{18}$ elecrons. Show Answer Correct Answer: D) 6.25 x 10$^{18}$ elecrons. 19. The heating coils/elements of different electrical appliances are usually made from ..... or ..... wires. 1. Copper 2. Aluminum 3. Nichrome 4. Tungsten A) 1 & 2. B) 1 & 4. C) 2 & 4. D) 3 & 4. Show Answer Correct Answer: D) 3 & 4. 20. Which sea creature can produce significant amounts of electricity? A) Turtle. B) Crocodile. C) Eel. D) None of the above. Show Answer Correct Answer: C) Eel. 21. Warm ocean currents generally come from A) The North Pole. B) The South Pole. C) The Equator. D) Both A and B. Show Answer Correct Answer: C) The Equator. 22. If two charges repel each other, the two charges must be A) Positive and neutra. B) Positive and negative. C) Positive and neutral. D) Negative and negative. Show Answer Correct Answer: D) Negative and negative. 23. As current flows through a wire, the number of ..... stays the same A) Circuits. B) Particles. C) Current. D) Electrons. Show Answer Correct Answer: D) Electrons. 24. ..... is the source of heat energy. A) Electric bulb. B) Fan. C) COMPUTER. D) None of the above. Show Answer Correct Answer: A) Electric bulb. 25. It is important to use electrical appliances with ..... marks on it. A) ISI. B) SIS. C) SSS. D) ASA. Show Answer Correct Answer: A) ISI. ← 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