Chemical effects of electric current MCQs with Answers

Question-1. A sheet of pure copper is used as

1. cathode
2. anode
3. positrode
4. negatrode

Question-2. Adding common salt to distilled water makes it

1. Good conductor
2. Insulator
3. No
4. Both Good conductor and Insulator

Question-3. Adding lime water to tap water makes it

1. an electrolyte
2. electrolysis
3. no change occur
4. none of these

Question-4. An electric lamp glows due to

1. Heating effect
2. Chemical effect
3. Magnetic effect
4. None

Question-5. An electrolyte is

1. A liquid that conducts current
2. A metal
3. A solution
4. All of these

Question-6. Chromium plating is done on many objects such as car parts, bath taps, kitchen gas stove etc. Why?

1. It does not corrode but prevents scratches
2. It looks beautiful
3. It costs less
4. Articles can be sold at higher price

Question-7. Copper wire is a

1. Good conductor
2. Poor conductor
3. Good conductor and poor conductor
4. None of the options

Question-8. Electroplating is based on

1. Chemical effect of electricity
2. Magnetic effect of electricity
3. Heating effect of electricity
4. Physical effect of electricity

Question-9. Electroplating prevents

1. Rusting
2. Current
3. Chemical effect
4. All

Question-10. Flow of electron is called

1. Electric current
2. Electroplating
3. Electrodes
4. Electrolyte

Question-11. Iron objects can be protected by electroplating them with

1. chromium
2. nickel
3. zinc
4. all of these

Question-12. Magnetic compass connected In a circuit is used to check

1. magnetism in electric current
2. slow current
3. small current
4. none of these

Question-13. Plastic wire is

1. An insulator
2. A conductor
3. An insulator and a conductor
4. None of the options

Question-14. The cans, used for storing food, are made by electroplating _____. on to irons

1. chromium
2. zinc
3. tin
4. none of these

Question-15. The pure piece of metal which is used to be plated, is made the

1. anode
2. cathode
3. nematode
4. posit rode

Question-16. The substance which is conductor of electricity is

1. rubber
2. paper
3. nails
4. plastic

Question-17. Waste from an electroplating factory must be disposed off

1. in the nearby river
2. in the nearby pond
3. in the nearby cornfield
4. according to the disposal guidelines of Waste Management Bodies

Question-18. When electrodes are immersed in water and electricity passed, the bubbles formed on the negative terminal is actually _______ gas.

1. Hydrogen
2. Carbon di oxide
3. Oxygen
4. Nitrogen

Question-19. Which of the following is a good conductor of electricity

1. istilled water
2. tap water
3. kerosene
4. none of these

Question-20. Which of the following is not used for electroplating any metal?

1. Gold
2. Silver
3. Sodium
4. Nickel

Question-21. Which of the following non-metals can be electroplated with copper?

1. Sodium
2. Iodine
3. Silicon
4. Carbon

Question-22. Which of the following solutions is a good conductor of electricity?

1. Glucose solution
2. Lemon juice
3. Alcohol solution
4. Distilled water

Question-23. A coating of…................is deposited on iron to protect it from corrosion and formation of rust

1. copper
2. aluminium
3. Zinc
4. silver

Question-24. An electric current can produce

1. heating effect
2. chemical effect
3. magnetic effect
4. all of these

Question-25. An electric lamp glows due to

1. heating effect
2. magnetic effect
3. chemical effect
4. physical effect

Question-26. Copper is

1. a good conductor
2. an insulator
3. both (a) and (b)
4. none of these

Question-27. Electroplating is based on

1. heating effect of electricity
2. chemical effect of electricity
3. physical effect of electricity
4. magnetic effect of electricity

Question-28. Electroplating prevents

1. corrosion
2. passing of current
3. dissociation
4. shining

Question-29. Flow of electron is called

1. electrolyte
2. electroplating
3. electrodes
4. electric current

Question-30. In LEDs, the longer lead (wire) is always connected to the _______ terminal

1. negative
2. neutral
3. positive
4. Any terminal

Question-31. Iron objects can be protected by electroplating them with

1. chromium
2. nickel
3. zinc
4. all of these

Question-32. Polythene is

1. a conductor
2. an insulator
3. both (a) and (b)
4. none of these

Question-33. Pure or distilled water is a

1. poor conductor
2. good conductor
3. both (a) and (b)
4. none of these

Question-34. Some liquids are good conductors of electricity and some are poor conductors. Which one is a poor conductor?

1. Acidic solution
2. Alkaline solution
3. Common Salt solution
4. Distilled water

Question-35. Tap water is a good conductor of electricity while distilled water is not because

1. Tap water contain salts
2. Distilled water do not contain salt
3. Only (a) is correct
4. Both (a) & (b) is correct

Question-36. The process of depositing a layer of any desired metal on another material by means of electricity is called ___________.

1. Electric plating
2. Electroplating
3. Electric depositing
4. None of the above

Question-37. Tin cans, used for storing food, are made by electroplating tin onto iron. Why?

1. Tin gives a shiny appearance
2. To make the vessel cheap
3. Tin is less reactive than iron.
4. To make the vessel lighter

Question-38. Which is not a non-electrolyte?

1. Ethyl alcohol
2. Sodium chloride
3. Urea
4. Sodium solution

Question-39. Which of the following does not conduct electricity?

1. Sugar solution
2. Vinegar solution
3. Lemon juice solution
4. Caustic soda solution

Question-40. Which of the following is a bad conductor of electricity?

1. Distilled water
2. Silver nitrate
3. Sulphuric acid
4. Copper sulphate

Question-41. Which of the following is a good conductor?

1. Brick
2. Steel
3. Plastic
4. Cotton

Question-42. Which of the following is not used for electroplating metal articles?

1. Nickel
2. Silver
3. Chromium
4. Sodium

Question-43. Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?

1. To increase acidity
2. To increase conductivity
3. So that the colour becomes more prominent
4. To burn copper sulphate