This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The process of depositing a layer of desired metal on another metal A) Electrolysis. B) Electroplating. C) Electrophoresis. D) Electrogram. Show Answer Correct Answer: B) Electroplating. 2. Who was the first person to notice the deflection of compass needle everytime the current was passed through a wire kept nearby? A) Thomas Edison. B) Albert Einstein. C) Hans Christian Oersted. D) Michael Faraday. Show Answer Correct Answer: C) Hans Christian Oersted. 3. What happens when the circuit is open? A) Light bulb comes on. B) Device won't work. C) Static discharge. D) Lightning. Show Answer Correct Answer: B) Device won't work. 4. Electric bell works on ..... effect of current A) Heating effect. B) Magnetic effect. C) Lighting effect. D) None of these. Show Answer Correct Answer: B) Magnetic effect. 5. In a uniform magnetic field the field, lines are: A) Concentric circles. B) Parallel lines. C) Non-parallel lines. D) None of these. Show Answer Correct Answer: B) Parallel lines. 6. Which of the following appliances is not based on the principle of heating effect of electric current? A) Electric bulb. B) Electric kettle. C) Electric bell. D) Electric iron. Show Answer Correct Answer: C) Electric bell. 7. The average relaxation time during collision of electrons with atoms is A) 10$^{-14 }$sec. B) 10$^{-10}$. C) 10$^{4}$. D) 10$^{14}$. Show Answer Correct Answer: A) 10$^{-14 }$sec. 8. What do we call a device that converts electricity into mechanical movement? A) Electric charge. B) Electric motor. C) Electric current. D) Electric plasma. Show Answer Correct Answer: B) Electric motor. 9. Substances that conduct electricity are called ..... A) Conductors. B) Insulators. C) Semi-conductors. D) All of the above. Show Answer Correct Answer: A) Conductors. 10. What is found in the nucleus of an atom? A) Protons and electrons. B) Neutrons and electrons. C) Protons and neutrons. D) None of the above. Show Answer Correct Answer: C) Protons and neutrons. 11. Electric kettles and radiators use the effect of current flow known as: A) Mechanical. B) Heating. C) Magnetic. D) Thermal. Show Answer Correct Answer: B) Heating. 12. Directions of drift velocity of electrons and electric field are A) In same direction. B) Opposite to each other. C) Fluctuated. D) None of above. Show Answer Correct Answer: B) Opposite to each other. 13. What device changes mechanical kinetic energy into electrical energy? A) Electric motor. B) Insulator. C) Electromagnet. D) Generator. Show Answer Correct Answer: D) Generator. 14. Current in an electric circuit can exceeds it's maximum limit when, A) 1.One device is connected to the socket. B) 2.Touching of two neutral wires. C) 3.Insulation break down. D) 4.Touching of two live wires. Show Answer Correct Answer: C) 3.Insulation break down. 15. Ordinary cells used in torches are ..... A) Chargeable. B) Rechargeable. C) Not recharged when exhausted. D) Rechargeable when exhausted. Show Answer Correct Answer: C) Not recharged when exhausted. 16. Like poles of a magnet do what? A) Repel. B) Attract. C) Nothing. D) None of the above. Show Answer Correct Answer: A) Repel. 17. The direction of induced current is determined by: A) Fleming's left hand rule. B) Fleming's right hand rule. C) Corkscrew rule. D) None of these. Show Answer Correct Answer: B) Fleming's right hand rule. 18. The North pole of Earth's magnetic field is in the: A) Geographical South. B) Geographical East. C) Geographical West. D) Geographical North. Show Answer Correct Answer: A) Geographical South. 19. Why is LED preferred to other type of bulbs? A) It is cheap. B) It works efficiently. C) It can glow even when weak or less current flows through it. D) It can glow even when high or more current flows through it. Show Answer Correct Answer: C) It can glow even when weak or less current flows through it. 20. What happens to the strength of the magnetic field when the current through a wire is increased? A) Increases. B) Decreases. C) Remains the same. D) Becomes zero. Show Answer Correct Answer: A) Increases. 21. Which of the following phenomenon occurs when two naked wires of electricity supply line touch each other? A) Overloading. B) Short circuiting. C) Lightening. D) None of these. Show Answer Correct Answer: B) Short circuiting. 22. Rechargeable batteries are batteries that can have their internal chemical reaction: A) Reversed. B) Discharged. C) Charged. D) Partially charged. Show Answer Correct Answer: A) Reversed. 23. Metal which is electroplated on car parts such as bumpers. A) Chromium. B) Copper. C) Iron. D) Aluminium. Show Answer Correct Answer: A) Chromium. 24. The symbol used to express the current is ..... A) V. B) I. C) R. D) C. Show Answer Correct Answer: B) I. 25. A basic voltaic cell consists of two different metal electrodes immersed in an electrolyte. 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 10Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books