This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 32 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 32 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Electromagnets are not used to lift heavy loads. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 2. A device that is used to break an electric circuit is called A) Switch. B) Circuit. C) Current. D) Light energy. Show Answer Correct Answer: A) Switch. 3. The magnetic field inside a long straight solenoid-carrying current A) Is zero. B) Decreases as we move towards its end. C) Increases as we move towards its end. D) Is the same at all points. Show Answer Correct Answer: D) Is the same at all points. 4. A student drops some nails into a trash can half filled with wood shavings. Which is a way to separate the mixture of nails and shavings?sifting A) Sifting. B) Flotation. C) Evaporation. D) Using a filter. Show Answer Correct Answer: A) Sifting. 5. Full form of-CFL A) Compact Flood Light. B) Common Full Light. C) Compact Fluorescent Lamp. D) Compact Flood Lamp. Show Answer Correct Answer: C) Compact Fluorescent Lamp. 6. An electric bulb is an example of the heating effect of an electric current A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. Temperature and salinity differences in ocean water cause: A) Mid-ocean ridges. B) Deep Currents. C) Surface Currents. D) High tide and low tide. Show Answer Correct Answer: B) Deep Currents. 8. Name the scientist who discovered electromagnetism. A) Hans Christian Oersted. B) Hans Christian Orested. C) Han Christian Oersted. D) Hans Christian Orsted. Show Answer Correct Answer: A) Hans Christian Oersted. 9. Inside the magnet the direction of field lines from its A) North pole to south pole. B) North to north pole. C) South pole to north pole. D) South to south pole. Show Answer Correct Answer: C) South pole to north pole. 10. When does an electromagnet lose its magnetic Property? A) When current is very high. B) When its switched off. C) When heat is very high. D) When current is switched on. Show Answer Correct Answer: B) When its switched off. 11. Which of the following is being used in place of fuses? A) MCB. B) Nichrome. C) Filament. D) Switch. Show Answer Correct Answer: A) MCB. 12. Which part of a circuit starts and stops the flow of electrical current? A) Battery. B) Light bulb. C) Wire. D) Switch. Show Answer Correct Answer: D) Switch. 13. How many terminals a cell has A) Two, both positive. B) Two, both negative. C) Two, one positive and another negative. D) None of the above. Show Answer Correct Answer: C) Two, one positive and another negative. 14. When an electric current flows through the wire it gets heated it is known as the heater A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 15. One disadvantage for physiological effects of electric current A) Respiratory paralysys. B) Electro Shocker-for the safety. C) To do echo-cardiogram. D) Galvanotherapy. Show Answer Correct Answer: A) Respiratory paralysys. 16. The amount of heat H produced in time t is A) VIt. B) 1/VIt. C) VI. D) QV. Show Answer Correct Answer: A) VIt. 17. The positive ions are known as- A) Anions. B) Cations. C) Cathode. D) Anode. Show Answer Correct Answer: B) Cations. 18. In the following formula, what represents the charge? A) F$_{e}$. B) Q. C) E. D) None of the above. Show Answer Correct Answer: B) Q. 19. Which type of material DOES NOT allow electric current to flow through it? A) An insulator. B) A magnet. C) A conductor. D) A metal. Show Answer Correct Answer: A) An insulator. 20. Key or switch in a circuit is placed A) Left side of the battery. B) Right side of the battery. C) Anywhere in the circuit. D) Near the positive terminal of cell. Show Answer Correct Answer: C) Anywhere in the circuit. 21. A student conducts an experiment by dropping a ball from different heights and measuring the time it takes to hit the ground. What is the independent variable in this experiment? A) The height from which the ball is dropped. B) The time it takes for the ball to hit the ground. C) The mass of the ball. D) The type of ball used. Show Answer Correct Answer: A) The height from which the ball is dropped. 22. Choose insulator from the following: A) Distilled water. B) Plastic. C) Wood. D) All of them. Show Answer Correct Answer: D) All of them. 23. A combination of two or more cells is called ( ) A) Battery. B) A Button cell. C) An Electric cell. D) Truck Battery. Show Answer Correct Answer: A) Battery. 24. Which of the following best describes the law of conservation of energy? A) Energy can be created and destroyed. B) Energy can be transformed from one form to another, but the total amount remains constant. C) Energy is always lost as heat. D) Energy is only conserved in closed systems. Show Answer Correct Answer: B) Energy can be transformed from one form to another, but the total amount remains constant. 25. The electric bell makes use of A) A U shaped electromagnet. B) A bar shaped electromagnet. C) A ring shaped electromagnet. D) No electromagnet. Show Answer Correct Answer: A) A U shaped electromagnet. ← 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