MCQ Questions for Class 8 Science Chapter 14 Chemical Effects of Electric Current with Answers
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MCQ Questions for Class 8 Science Chapter 14 Chemical Effects of Electric Current with Answers
Choose the correct option from the following:
Question 1.Which is the example of a bad conductor of electricity?
(a) Drinking water
(b) Sodium chloride
(c) Sulphuric acid
(d) Copper sulphate
... Answer :(a) Drinking water
Question 2. Which of the following is the example of non-conductor of electricity?
(a) Sugar solution
(b) Vinegar solution
(c) Lemon juice solution
(d) Caustic soda solution
... Answer :(a) Sugar solution
Question 3.Which type of effect shows by electric current
(a) heating effect
(b) chemical effect
(c) magnetic effect
(d) all of these
... Answer :
(d) all of these
Question 4.Pure or distilled water is a
(a) weak electrolyte
(b) strong electrolyte
(c) non-electrolyte
(d) none of these
... Answer :(c) non-electrolyte
Question 5.Which of the following is an example of good conductor?
(a) wood
(b) copper
(c) Plastic
(d) drinking water
... Answer :(b) copper
Question 6.Polythene is example of
(a) a good conductor
(b) an insulator
(c) a bad conductor
(d) none of these
... Answer :(b) an insulator
Question 7.Electroplating is based on
(a) heating effect of electricity
(b) chemical effect of electricity
(c) physical effect of electricity
(d) magnetic effect of electricity
... Answer :(b) chemical effect of electricity
Question 8.Copper is example of
(a) a good conductor
(b) an insulator
(c) a poor conductor
(d) none of these
... Answer :(a) a good conductor
Question 9.
... Answer :
Question 10. An electrolyte is
(a) a solid metal which conduct electricity
(b) a liquid that conducts current
(c) a solid non-metal which conduct electricity
(d) none of these
... Answer :(b) a liquid that conducts current
Question 11. Flow of electron in a particular direction is called
(a) electrolyte
(b) electroplating
(c) electrolysis
(d) electric current
... Answer :(d) electric current
Question 12. Which is not a non-electrolyte?
(a) sugar solution
(b) solid Sodium chloride
(c) Sodium chloride solution
(d) Sodium solution
... Answer :
(c) Sodium chloride solution
Question 13. When electricity pass through an electric lamp the electric lamp glows due to
(a) heating effect
(b) magnetic effect
(c) chemical effect
(d) physical effect
... Answer :
(a) heating effect
Question 14. Electroplating of a metal is done to prevents
(a) corrosion
(b) passing of current
(c) dissociation
(d) decrease its cost
... Answer :
(a) corrosion
Question 15. Which of the following is not used for electroplating metal articles?
(a) gold
(b) Silver
(c) Chromium
(d) calcium
... Answer :(d) calcium
MCQ Questions for Class 8 Science Chapter 14 Chemical Effects of Electric Current with Answers
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Question 16. The iron substances can be protected by electroplating them with
(a) chromium
(b) nickel
(c) zinc
(d) all of these
... Answer :(d) all of these
Question 17. There is two wire connected to the LED and they are different in length, The longer lead (wire) is always connected to the _______ terminal
(a) negative
(b) neutral
(c) positive
(d) Any terminal
... Answer :(c) positive
Question 18. Tap water is a good conductor of electricity while distilled water is not because
(a) Tap water contain salts and distilled water do not contain salt
(b) tap water do not contain salt but distilled water contain some salt
(c) Both contain salt
(d) Both do not contain salt
... Answer :(a) Tap water contain salts and distilled water do not contain salt
Question 19. When electrodes are immersed in water and electricity passed then name the gas which is produce at the positive electrode of the cell
(a) Hydrogen
(b) Carbon dioxide
(c) Oxygen
(d) Nitrogen
... Answer :(c) Oxygen
Question 20. When electrodes are immersed in water and electricity passed then name the gas which is produce at the negative electrode of the cell
(a) Hydrogen
(b) Carbon dioxide
(c) Oxygen
(d) Nitrogen
... Answer :(a) Hydrogen
Question 21. The advantage of adding little dilute sulphuric acid to copper sulphate solution during electroplating is
(a) to increase acidity of the solution
(b) to increase conductivity of the solution
(c) so blue colour of copper sulphate solution becomes more prominent
(d) to prevent burning copper sulphate
... Answer :(b) to increase conductivity of the solution
Question 22.
... Answer :
Question 23. Chromium plating is done by the process of electroplating on many objects such as car parts, bath taps, kitchen gas stove etc,. This is because chromium plating
(a) does not corrode but give shiny appearance
(b) looks beautiful
(c) costs less
(d) articles can be sold at higher price
... Answer :(a) does not corrode but give shiny appearance
Question 24. The process of depositing a layer of any desired metal on another material by the process of electricity is called ___________.
(a) Electric plating
(b) Electroplating
(c) Electric depositing
(d) None of the above
... Answer :(b) Electroplating
Question 25. Among the following, one of them is poor conductor of eletricity and it is
(a) acidic solution
(b) alkaline solution
(c) common Salt solution
(d) drinking water
... Answer :(d) drinking water
Question 26. 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
Question 27. Due to passing of electricity through electrolyte, the colour of the solution will change .This indicate
(a) the chemical effect of current.
(b) the heating effect of current.
(c) the magnetic effect of current.
(d) the lightning effect of current.
... Answer :(a) the chemical effect of current
Question 28. Which of the following metals is used in electroplating to make objects appear shining?
(a) iron
(b) copper
(c) chromium
(d) aluminium
... Answer :(c) chromium
Question 29. We make a Battery by using
(a) Large single cell
(b) Combination of two or more cells
(c) Combination of two cell only
(d) Combination of cell and conductor
... Answer :(b) Combination of two or more cells
Question 30. Which thing helps in conduction of electricity through electrolyte
(a) free electrons
(b) only cations
(c) only anions
(d) both cations and anions
... Answer :(d) both cations and anions
MCQ Questions for Class 8 Science Chapter 14 Chemical Effects of Electric Current with Answers
Fill in the blanks with suitable word/s.
Question 1. The. substances which allows of passing of electricity through them are called ___________.
... Answer : conductors
Question 2. The substances which do not allow to passing of electricity through them are called ___________.
... Answer :non-conductor
Question 3. An atom or group of atoms which carry positive charge are called ___________.
... Answer :cation
Question 4. The atom or group of atoms which carry negative charge are called ___________.
... Answer :anion
Question 5. The liquid through which electricity can pass and as a result chemical change occur in it is called ___________.
... Answer :electrolyte
Question 6.Distilled water is a ___________.
... Answer :non-electrolyte
Question 7. When very little amount of acid or base or salt add to distilled water it become ___________ conductor of electricity.
... Answer :good
Question 8. Light emitting diodes (LED) glow even when a ___________ electric current flows through it.
... Answer :very little amount of
Question 9. The passage of an electric current through a conducting solution causes ___________changes occur.
... Answer :chemical
Question 10. Handles of the door are ___________ plated to make it shiny.
... Answer :chromium
Question 11. There are ___________ wires attached to an LED and they are ___________ in length.
... Answer : two, different
Question 12. In an LED, the longer lead is attached to the ___________ terminal of the battery and the shorter lead to the ___________ terminal.
... Answer : positive, negative
Question 13. ___________ is the process in which a desired metal is deposited over another metal to protect it from corrosion.
... Answer : electroplating
Question 14. Distilled water is ___________ of electricity and drinking water is ___________ conductor of electricity.
... Answer :non-conductor, good
Question 15. Electroplating of iron, ___________ the iron from corrosion.
... Answer : prevent
Question 16. In ___________ state electrolyte conduct electricity.
... Answer :liquid
Question 17. An electric lamp glows due to ___________ effect of electric current.
... Answer : heating
Question 18. There are ___________ type of electrode dipping into the electrolyte and they are called ___________ and ___________.
... Answer : two, cathode, anode
Question 19. In liquids ___________ helps to conduct electricity.
... Answer : free ions
Question 20. In solid ___________ helps to conduct electricity.
... Answer :free electrons
MCQ Questions for Class 8 Science Chapter 14 Chemical Effects of Electric Current with Answers
State whether the given statements are true or false.
Question 1. Dry wood is a good conductor of electricity.
... Answer : false
Question 2. Drinking water is a conductor of electricity.
... Answer :true
Question 3. All liquids are electrolyte.
... Answer :false
Question 4. Distilled water is non-conductor because it does not contain any salt.
... Answer :true
Question 5. Pure water or distilled water conducts electricity.
... Answer :false
Question 6. Most liquids that conducts electricity are solutions of acids, bases and salts.
... Answer :true
Question 7. Electroplating is based on heating effect of electricity.
... Answer :false
Question 8. Tap water is conductor of electricity because small amount of mineral naturally present in it.
... Answer :true
Question 9. Free ions helps to conduct electricity through copper wire.
... Answer :false
Question 10. An electric bulb glows due to chemical effect of electricity.
... Answer :false
Question 11. When we add small amount of salt or acid or base in distilled water, it become conductor of electricity.
... Answer :true
Question 12. LED is an electric bulb which is used in a tester
... Answer :true
Question 13. Sodium chloride solution is a weak electrolyte.
... Answer :false
Question 14. When electric current is passed through the copper sulphate solution, chemical changes occur and copper ions (cation) and sulphate ions (anion) are formed.
... Answer :true
Question 15. In an LED bulb, the longer lead is connected to the negative terminal of the battery.
... Answer :false
Question 16. Electric current produces a magnetic effect.
... Answer :true
Question 17. When we add some sodium hydroxide to distilled water it become non-electrolyte.
... Answer :false
Question 18. Kerosene is an electrolyte.
... Answer :false
Question 19. The electrode which is connect to the negative terminal of a battery is called anode.
... Answer :false
Question 20. Human body is insulator of electricity.
... Answer :false
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