This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 18 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A crystal of NaCl can conduct electricity. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 2. When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually ..... gas. A) Hydrogen. B) Oxygen. C) Carbon dioxide. D) Nitrogen. Show Answer Correct Answer: B) Oxygen. 3. An electric current flowing in one direction only A) Voltage. B) Parallel current. C) Direct current. D) Electric current. Show Answer Correct Answer: C) Direct current. 4. What is the full form of MCB- A) Massive Circuit Breaker. B) Massive Circuit Body. C) Mighty Circuit Breaker. D) Miniature Circuit Breaker. Show Answer Correct Answer: D) Miniature Circuit Breaker. 5. The direction of current in the coil at one end of an electromagnet is clockwise. This end of the electromagnet will be: A) North pole. B) East pole. C) South pole. D) West pole. Show Answer Correct Answer: C) South pole. 6. A safety device A) Electric fuse. B) Electric bell. C) Fan. D) None. Show Answer Correct Answer: A) Electric fuse. 7. Deep Ocean currents are primarily caused by ..... A) Temperature and salinity. B) Wind. C) Gravity. D) Precipitation. Show Answer Correct Answer: A) Temperature and salinity. 8. If you were plating with copper, which electrolyte could be used A) Copper sulfate. B) Nickel sulfate. C) Hydrochloric acid. D) Sulfuric acid. Show Answer Correct Answer: A) Copper sulfate. 9. What is the Voltage of a circuit that has a resistance of 5 $\Omega$ and a current of 2 A? A) 25 V. B) 10 V. C) 2.5 V. D) 0.4 V. Show Answer Correct Answer: B) 10 V. 10. Does the compass needle show deflection for lemon juice A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 11. An electric cell produces electricity from the ..... in it. A) Chemicals stored. B) Food stored. C) Acid stored. D) Bases stored. Show Answer Correct Answer: A) Chemicals stored. 12. When an electric current flows through a wire, it behaves like a magnet. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 13. When a liquid conducts electricity, a process other than conduction also takes place. What process is this? A) Electrolysis. B) Electrochemical reaction. C) Electroplating. D) Oxidation. Show Answer Correct Answer: A) Electrolysis. 14. A cell has a ..... on the top A) Metal disk. B) Metal cap. C) Head cap. D) Hat. Show Answer Correct Answer: A) Metal disk. 15. Is Vinegar a conductor of electricity? A) Not mentioned in the text. B) False. C) Maybe. D) True. Show Answer Correct Answer: B) False. 16. When the plane of the loop is parallel to the magnetic field the torque on the current loop is ..... A) Zero. B) Maximum. C) Minimum. D) Equal. Show Answer Correct Answer: B) Maximum. 17. The total sum of the kinetic energy in a given sample A) Heat. B) Temperature. C) Salinity. D) Density. Show Answer Correct Answer: A) Heat. 18. Long wire generates more heat than shorter wire. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 19. Copper wires are used as conducting wires. because A) It offers no resistance. B) It offers very high resistance. C) Very cheap in price and easily available. D) It offers very less resistance. Show Answer Correct Answer: D) It offers very less resistance. 20. True or False:The electrode which is connected to the negative terminal of a battery is called the anode. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 21. When number of turns in solenoid increase, electromagnetic strength ..... A) Increase. B) Decrease. C) All the above. D) None of the above. Show Answer Correct Answer: A) Increase. 22. ..... and ..... affect the ocean's density and cause the Global Conveyor Belt to travel A) Gravity and the Coriolis Effect. B) Temperature and salinity. C) Wind and climate. D) Temperature and the Coriolis Effect. Show Answer Correct Answer: B) Temperature and salinity. 23. An object becomes charged when the atoms in the object gain or lose A) Electrons. B) Protons. C) Neutrons. D) All of the above. Show Answer Correct Answer: A) Electrons. 24. The frequency of A.C. in India is: A) 25 Hz. B) 50 Hz. C) 75 Hz. D) 100 Hz. Show Answer Correct Answer: B) 50 Hz. 25. The phenomenon of electromagnetic induction is: A) The process of charging a body. B) The process of generating magnetic field due to current passing through the coil. C) Producing induced current in a coil due to relative motion between a magnet and a coil. D) The process of rotating a coil of an electric motor. Show Answer Correct Answer: C) Producing induced current in a coil due to relative motion between a magnet and a coil. ← 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