MCQs Questions For Class 8 Science Chapter 14 : Chemical Effects Of Electrical Current pdf
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MCQs On Chemical Effects Of Electrical Current Class 8
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
2. An electrolyte is________
(a)a metal
(b) a solution
(c) a liquid that conducts current
(d) all of above
Answer: C
3. Copper wire is a_______
(a) Good conductor
(b) Poor conductor
(c)Both a and b
(d)None of this
Answer: A
4. Flow of electron is called___________
(a) Electroplating
(b) Electric current
(c) Electrodes
(d) Electrolyte
Answer: B
5. Electroplating prevents____________
(a) Current
(b)Chemical effect
(c) Rusting
(d) All
Answer: C
6. An electric lamp glows due to_____________
(a) Chemical effect
(b) Magnetic effect
(c) Heating effect
(d)None of the above
Answer: C
7. Poor conductors are_____________
(a) Plastics
(b) Clothes
(c) Wood
(d) All of the above
Answer: D
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
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
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
11. An electric lamp glows due to__________
(a) Chemical effect
(b) Magnetic effect
(c) Heating effect
(d) None of the above
Answer: C
12. A device which prevents or allow the current to flow through it___________
(a) Conductor
(b) Motor
(c) Terminal
(d) Switch
Answer: D
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
14. Which of the following liquid is good conductor of electricity?
(a) Sugar solution
(b) Alcohol
(c) Distilled water
(d) Sea water
Answer: D
15. Conductor having very high resistance is________________
(a) Insulator
(b) Resistor
(c) Semi conductor
(d) Good conductor
Answer: A
16. When two or more cells are joined together it forms a___________
(a) Transistor
(b) Battery
(c) Radio
(d) Dynamo
Answer: B
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
18. Which of the following is a good conductor?
(a) Brick
(b) Steel
(c) Plastic
(d) Cotton
Answer: B
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
20. Flow of electron is called____________
(a) electrolyte
(b) electroplating
(c) electrodes
(d) electric current
Answer: D
21. Which of the following is not used for electroplating metal articles?
(a) Nickel
(b) Silver
(c) Chromium
(d) Sodium
Answer: D
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
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
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
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
