Chemical Effects of Electric Current Class 8 MCQ

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Chemical Effects of Electric Current Class 8 MCQ with Answers

1. When we Adding common salt to distilled water makes it_______
(a) Good conductor
(b) Insulator
(c) No
(d)Both a and b
Answer: (a) Good conductor
Explanation: Adding common salt (sodium chloride) to distilled water increases its conductivity because salt dissociates into ions (sodium and chloride ions) in water, which allows it to conduct electricity.

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2. An electrolyte is________
(a) a metal
(b) a solution
(c) a liquid that conducts current
(d) all of above
Answer: (c) a liquid that conducts current
Explanation: An electrolyte is a substance, typically a liquid or solution, that contains ions and can conduct electricity. It facilitates the movement of ions, allowing the flow of electric current.

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3. Copper wire is a_______
(a) Good conductor
(b) Poor conductor
(c) Both a and b
(d) None of this
Answer: (a) Good conductor
Explanation: Copper wire is a good conductor of electricity due to its high electrical conductivity. It allows the easy flow of electrons through its structure.

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4. Flow of electron is called___________
(a) Electroplating
(b) Electric current
(c) Electrodes
(d) Electrolyte
Answer: (b) Electric current
Explanation: The flow of electrons through a conductor is called electric current. This flow of charge is the basis of electricity.

5. Electroplating prevents____________
(a) Current
(b)Chemical effect
(c) Rusting
(d) All
Answer: (c) Rusting
Explanation: Electroplating applies a thin layer of a more reactive metal, such as chromium or zinc, onto the surface of an object to prevent corrosion and rusting.

6. An electric lamp glows due to_____________
(a) Chemical effect
(b) Magnetic effect
(c) Heating effect
(d)None of the above
Answer: (c) Heating effect
Explanation: An electric lamp glows due to the heating effect of electricity. The filament inside the bulb heats up and emits light as a result of the electric current passing through it.

7. Poor conductors are_____________
(a) Plastics
(b) Clothes
(c) Wood
(d) All of the above
Answer: (d) All of the above
Explanation: Poor conductors, also known as insulators, include plastics, clothes, and wood. These materials do not readily allow the flow of electric current.

8. Electroplating is done __
(a) To protect the metals against corrosion
(b) To give shiny appearance to articles
(c) To repair the worn out materials
(d) All of the above
Answer: (d) All of the above
Explanation: Electroplating serves multiple purposes, including protecting metals against corrosion, enhancing appearance, and repairing worn-out materials.

9. Electroplating is based on_____________
(a) magnetic effect of electricity
(b) chemical effect of electricity
(c) heating effect of electricity
(d) physical effect of electricity
Answer: (b) Chemical effect of electricity
Explanation: Electroplating is based on the chemical effect of electricity, where metal ions are reduced from a solution onto a conductive object.

10. Which acid is present in lemon juice that acts as an electrolyte?
(a) Sulphuric acid
(b) Nitric acid
(c) Hydrochloric acid
(d) Citric acid
Answer: (d) Citric acid
Explanation: Citric acid present in lemon juice acts as an electrolyte, facilitating the conduction of electric current.

11. An electric lamp glows due to__________
(a) Chemical effect
(b) Magnetic effect
(c) Heating effect
(d) None of the above
Answer: (c) Heating effect
Explanation: An electric lamp glows due to the heating effect of electricity. The filament inside the bulb heats up and emits light as a result of the electric current passing through it.

12. A device which prevents or allow the current to flow through it___________
(a) Conductor
(b) Motor
(c) Terminal
(d) Switch
Answer: (d) Switch
Explanation: A switch is a device that can control the flow of electric current by opening or closing a circuit.

13. When the liquid between two ends allow electric current, then____________
(a) Colour of tester bulb changes
(b) Bulb of tester heat up only
(c) Bulb of tester glows
(d) All of the above
Answer: (c) Bulb of tester glows
Explanation: When the liquid between two ends allows electric current, the bulb of the tester glows, indicating that the liquid is a conductor of electricity.

14. Which of the following liquid is good conductor of electricity?
(a) Sugar solution
(b) Alcohol
(c) Distilled water
(d) Sea water
Answer: (d) Sea water
Explanation: Sea water is a good conductor of electricity due to the presence of dissolved salts and ions.

15. Conductor having very high resistance is________________
(a) Insulator
(b) Resistor
(c) Semi conductor
(d) Good conductor
Answer: (a) Insulator
Explanation: A conductor with very high resistance is categorized as an insulator, which does not allow the flow of electric current.

16. When two or more cells are joined together it forms a___________
(a) Transistor
(b) Battery
(c) Radio
(d) Dynamo
Answer: (b) Battery
Explanation: When two or more cells are joined together, they form a battery. A battery stores electrical energy for later use.

17. Which of the following does not conduct electricity?
(a) Sugar solution
(b) Vinegar solution
(c) Lemon juice solution
(d) Caustic soda solution
Answer: (a) Sugar solution
Explanation: Sugar solution does not conduct electricity because it does not contain ions that can carry electric charge.

18. Which of the following is a good conductor?
(a) Brick
(b) Steel
(c) Plastic
(d) Cotton
Answer: (b) Steel
Explanation: Steel is a good conductor of electricity due to the presence of mobile electrons within its structure.

19. Waste from an electroplating factory must be disposed off___________
(a) in the nearby river
(b) in the nearby pond
(c) in the nearby cornfield
(d) according to the disposal guidelines of Waste Management Bodies
Answer: (d) According to the disposal guidelines of Waste Management Bodies
Explanation: Waste from electroplating factories must be disposed of according to specific guidelines to ensure environmental protection.

20. Flow of electron is called____________
(a) electrolyte
(b) electroplating
(c) electrodes
(d) electric current
Answer: (d) Electric current
Explanation: The flow of electrons through a conductor is called electric current, which is the basis of electricity.

21. Which of the following is not used for electroplating metal articles?
(a) Nickel
(b) Silver
(c) Chromium
(d) Sodium
Answer: (d) Sodium
Explanation: Sodium is not typically used for electroplating metal articles. Common metals used include nickel, silver, and chromium.

22. Tap water is a good conductor of electricity while distilled water is not because____________
(a) Tap water contain salts
(b) Distilled water do not contain salt
(c) Only (a) is correct
(d) Both (a) & (b) is correct
Answer: (b) Distilled water do not contain salt
Explanation: Tap water contains dissolved salts and minerals, making it a conductor of electricity, whereas distilled water, which lacks ions, is not conductive.

23. Coating of ___is deposited on iron to protect it from corrosion and formation of rust.
(a) copper
(b) aluminium
(c) Zinc
(d) silver
Answer: (c) Zinc
Explanation: Zinc coating is deposited on iron to protect it from corrosion and rust formation. This process is known as galvanization

24. Tin cans, used for storing food, are made by electroplating tin onto iron. Why?
(a) Tin gives a shiny appearance
(b) To make the vessel cheap
(c) Tin is less reactive than iron.
(d) To make the vessel lighter
Answer: (c) Tin is less reactive than iron
Explanation: Tin is less reactive than iron, so electroplating tin onto iron helps prevent corrosion and rusting.

25. The process of depositing a layer of any desired metal on another material by means of electricity is called _
(a) Electric plating
(b) Electroplating
(c) Electric depositing
(d) None of the above
Answer: (b) Electroplating
Explanation: Electroplating is the process of depositing a layer of any desired metal onto another material by means of electricity. It is commonly used for various applications, including decorative and protective coatings.