This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 39 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 39 (8 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will A) Change in previous direction. B) Not change. C) Change in opposite direction. D) None of these. Show Answer Correct Answer: B) Not change. 2. Iron used in bridges and automobiles are coated with A) Chromium. B) Tin. C) Copper. D) Zinc. Show Answer Correct Answer: D) Zinc. 3. If we keep a compass inside a cardboard with cell and switch attached, it shows magnetic effect of current. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 4. How can corrosion be prevented in iron? A) By using a hammer to break the iron. B) By applying a protective coating, using sacrificial anodes, or galvanizing the iron. C) By exposing to extreme heat. D) By soaking in water for extended periods. Show Answer Correct Answer: B) By applying a protective coating, using sacrificial anodes, or galvanizing the iron. 5. Select the one that you will prefer to make an electromagnet. A) Steel. B) Plastic. C) Stainless steel. D) Soft iron. Show Answer Correct Answer: D) Soft iron. 6. A 10 cm long wire with a cross-sectional area of 5 mm$^{3}$ has a resistance of 40 $\Omega$. It is then replaced with a wire of the same material, 20 cm long and with a cross-sectional area of 20 mm$^{3}$. What is the new resistance? A) 10 $^{} $ Oh. B) 20 oh. C) 40 oh. D) 80 oh. Show Answer Correct Answer: B) 20 oh. 7. The process of electromagnetic Induction was first discovered by: A) Maxwell. B) Ampere. C) Oersted. D) Michael Faraday. Show Answer Correct Answer: D) Michael Faraday. 8. When an electric current pass through by the conductors, the conductor ..... A) To begin crash. B) Going to freeze. C) Heats up. D) Going to melt. Show Answer Correct Answer: C) Heats up. ← PreviousRelated 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