MCQ Questions for Class 8 Science: Ch 14 Chemical Effects of Electric Current

MCQ Questions for Class 8 Science: Ch 14 Chemical Effects of Electric Current

1. Which of the following does not conduct electricity?
(a) Sugar solution
(b) Vinegar solution
(c) Lemon juice solution
(d) Caustic soda solution
► (a) Sugar solution

2. An electric lamp glows due to        
(a) Chemical effect        
(b) Magnetic effect        
(c) Heating effect        
(d) None
► (c) Heating effect        

3. Battery is a
(a) Large single cell
(b) Combination of two or more cells
(c) Combination of two cell only
(d) Combination of cell and conductor
► (b) Combination of two or more cells

4. Potential difference is created in a electric circuit due to
(a) Switch
(b) Cell or battery
(c) Voltmeter
(d) Conductor
► (b) Cell or battery

5. In electrolytic solutions, which of the following acts as carrier of charge?
(a) Protons
(b) Electrons
(c) Neutrons
(d) Ions
► (d) Ions

6. Fuse wire is used in electric circuit to prevent
(a) Electrical appliances and circuit from high current
(b) Prevent the insulator
(c) Us from electric shock
(d) Prevent the ammeter
► (a) Electrical appliances and circuit from high current

7. Which of the appliances at your home does not run on electric current?
(a) Television
(b) Mixer grinder
(c) Air conditioner
(d) Gas burner
► (d) Gas burner

8. The passage of an electric current through a solution causes
(a) Heating effect
(b) Lighting effect
(c) Chemical effect
(d) All of these
► (c) Chemical effect

9. In a dry cell, which of the following acts as the positive terminal?
(a) Carbon rod
(b) Manganese dioxide
(c) Manganese dioxide and powdered carbon
(d) A metal cap on the carbon rod
► (d) A metal cap on the carbon rod

10. Electroplating is based on:
(a) magnetic effect of electricity
(b) chemical effect of electricity
(c) heating effect of electricity
(d) physical effect of electricity
► (b) chemical effect of electricity

11. Distilled water is
(a) Poor conductor
(b) Good conductor
(c) Both (a) and (b)
(d) None
► (a) Poor conductor

12. A device which prevents or allow the current to flow through it
(a) Conductor
(b) Motor
(c) Terminal
(d) Switch
► (d) Switch

13. What is current?
(a) The flow of matter
(b) The flow of electrons
(c) The flow of protons
(d) The flow of charge
► (d) The flow of charge

14. Electric current is measured by a device
(a) Odometer
(b) Voltmeter
(c) Ammeter
(d) Galvanometer
► (c) Ammeter

15. In battery two or more cells are connected in
(a) Series
(b) Random
(c) Positive and positive terminals
(d) Parallel
► (a) Series

16. Which of the following liquids is a bad conductor of electricity?
(a) Lemon juice
(b) Vinegar
(c) Sea water
(d) Distilled water
► (d) Distilled water

17. Which acid is present in lemon juice that acts as an electrolyte?
(a) Sulphuric acid
(b) Nitric acid
(c) Hydrochloric acid
(d) Citric acid
► (d) Citric acid

18. Which categories of substance are generally good conductors?
(a) Insulator
(b) Non-metals
(c) Metals
(d) Reflector
► (c) Metals

19. An electric lamp glows due to
(a) Chemical effect
(b) Magnetic effect
(c) Heating effect
(d) None
► (c) Heating effect

20. Which metal is electroplated on iron for making “cans” for storing food and drinks?
(a) Chromium metal
(b) Silver metal
(c) Tin metal
(d) Copper metal
► (c) Tin metal

21. Which of the following are the characteristics of an electrolyte?
(a) It has a positive charge.
(b) It has a negative charge.
(c) It conducts charge without dissociating.
(d) It forms positive and negative ions.
► (d) It forms positive and negative ions.

22. What is the common name for manganese-dioxide-alkaline-zinc cell?
(a) Moz cell
(b) Long life cell
(c) Manganese-dioxide
(d) Alkaline cell
► (d) Alkaline cell

23. Which of the following is an insulator?
(a) Wood
(b) Iron
(c) Graphite
(d) Silver
► (a) Wood

24. In electric circuit, current flows due to
(a) Difference in temperature
(b) Same potential difference
(c) Difference in potential difference
(d) Difference in current
► (c) Difference in potential difference

25. The bulb glows when the electric current passes through it due to
(a) Lighting effect of electric current
(b) Magnetic effect of electric current
(c) Heating effect of electric current
(d) Chemical effect of electric current
► (c) Heating effect of electric current
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