NCERT MCQ Solutions for Class 8 Science Chapter 11 Chemical Effects of Electric Current for Session 2025–26 provide well-structured multiple choice questions with accurate answers to help students strengthen their understanding of conductors, chemical effects, and electroplating. These solutions follow the latest NCERT syllabus and offer concept-based practice to boost exam preparation. Ideal for quick revision, these MCQs improve reasoning skills and ensure strong conceptual clarity for the academic year 2025–26.
Class 8 Science Chapter 11 Solution
Class 8 Science MCQ
Class 8 All Subjects MCQ
Class 8 Science Chapter 11 MCQ Online Test
Q1. Why is it dangerous to touch an electrical appliance with wet hands?
[A]. Water is a good conductor of electricity.
[B]. Water reduces the resistance of the appliance.
[C]. Water can cause the appliance to overheat.
[D]. Water increases the voltage of the appliance.
Q2. Which of the following materials is a good conductor of electricity?
[A]. Plastic
[B]. Copper
[C]. Wood
[D]. Rubber
Q3. What is the purpose of using a tester in the activities described in the chapter?
[A]. To check the temperature of a liquid.
[B]. To test whether a material conducts electricity.
[C]. To determine the color of a solution.
[D]. To measure the voltage of a battery.
Q4. Why might the bulb in a tester not glow even if the liquid is conducting electricity?
[A]. The bulb is too large.
[B]. The liquid is too cold.
[C]. The battery is fully charged.
[D]. The current is too weak to heat the filament.
Class 8 Science Chapter 11 Quiz for Exam
Q5. What can be used instead of a bulb in a tester to detect weak currents?
[A]. A fuse
[B]. A resistor
[C]. A voltmeter
[D]. A compass needle
Q6. Which of the following liquids is a good conductor of electricity?
[A]. Vegetable oil
[B]. Lemon juice
[C]. Honey
[D]. Distilled water
Q7. What happens when an electric current is passed through a conducting solution?
[A]. Chemical reactions occur.
[B]. The solution becomes solid.
[C]. The solution changes color without any reaction.
[D]. The solution evaporates.
Q8. What is the process of depositing a layer of one metal on another using electricity called?
[A]. Galvanization
[B]. Electroplating
[C]. Magnetization
[D]. Electrolysis
Class 8 Science Chapter 11 MCQ Explanation
Q9. Why is chromium electroplated on objects like car parts and bicycle handlebars?
[A]. Chromium is lightweight.
[B]. Chromium is shiny and resists corrosion.
[C]. Chromium is a poor conductor of electricity.
[D]. Chromium is cheap.
Q10. What is the purpose of adding a few drops of dilute sulphuric acid to copper sulphate solution in the electroplating activity?
[A]. To change the color of the solution.
[B]. To cool the solution.
[C]. To solidify the solution.
[D]. To make the solution more conducting.
Q11. Which gas is produced at the positive electrode when electric current is passed through water?
[A]. Nitrogen
[B]. Oxygen
[C]. Carbon dioxide
[D]. Hydrogen
Q12. What is the main concern with the disposal of used conducting solutions in electroplating factories?
[A]. They are highly flammable.
[B]. They are polluting and require specific disposal guidelines.
[C]. They are difficult to transport.
[D]. They are expensive to dispose of.
Class 8 Science Chapter 11 Quiz Revision
Q13. Why is tin electroplated on iron for making food cans?
[A]. Tin prevents food from coming into contact with iron.
[B]. Tin makes the cans lighter.
[C]. Tin is more reactive than iron.
[D]. Tin is cheaper than iron.
Q14. What is the role of the longer lead in an LED?
[A]. It is connected to the positive terminal of the battery.
[B]. It is used for grounding the circuit.
[C]. It is not necessary for the LED to function.
[D]. It is connected to the negative terminal of the battery.
Q15. Which of the following is NOT a chemical effect of electric current?
[A]. Change in color of the solution.
[B]. Heating of the solution.
[C]. Deposition of metal on electrodes.
[D]. Formation of gas bubbles.
Q16. What did Boojho observe when he inserted copper wires into a potato and left them for half an hour?
[A]. The potato started glowing.
[B]. A greenish-blue spot formed around the wire connected to the positive terminal.
[C]. The wires melted.
[D]. The potato turned black.
Class 8 Science Chapter 11 MCQ with Answers
Q17. Why is distilled water a poor conductor of electricity?
[A]. It is too cold.
[B]. It is too dense.
[C]. It is acidic.
[D]. It contains no salts or impurities.
Q18. What is the primary reason for shutting off the main electrical supply before using water hoses in case of a fire?
[A]. To prevent electric shocks, as water conducts electricity.
[B]. To avoid short circuits in the hoses.
[C]. To reduce water pressure.
[D]. To save electricity.
Q19. Why does seawater cause more deflection in a compass needle compared to drinking water?
[A]. Seawater is acidic.
[B]. Seawater is denser.
[C]. Seawater contains more salts, making it a better conductor.
[D]. Seawater is colder.
Q20. What is the main advantage of using LED lights over traditional bulbs?
[A]. LEDs are more fragile.
[B]. LEDs have a longer lifetime and consume less electricity.
[C]. LEDs consume more electricity.
[D]. LEDs are heavier.
