Here we are providing Class 8 Science Objective Chapter – 14 Chemical Effects of Electric Current because its very important for Class 8 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 8 Science Objective Chapter – 14 Chemical Effects of Electric Current is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 8 Science Objective Chapter – 14 Chemical Effects of Electric Current Wastewater Story 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 8 Science Objective Chapter – 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
Ans – ( A )
2.A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid. A white it glows very dimly for liquid H. You would conclude that:
( A ) liquid A is a better conductor than liquid B
( B ) liquid B is a better conductor than liquid A
( C ) both liquids are equally conducting
( D ) conducting properties of liquid cannot be compared in this manner
Ans – ( A )
3.An electric current can produce
( A ) heating effect ( B ) chemical effect
( C ) magnetic effect ( D ) chemical, heating and magnetic effects
Ans – ( D )
4. An electric lamp glows due to
( A ) Chemical effect
( B ) Magnetic effect
( C ) Heating effect
( D ) None
Ans – ( C )
5.Which one is the conductor
( A ) brass
( B ) plastic
( C ) mica
( D ) leather
Ans – ( A )
6.Boojho’s unde has set up an electroplating factory near his village. He should dispose off, the waste of the factory
( A ) in the nearby river
( B ) in the nearby pond
( C ) in the nearby corn field
( D ) according to the disposal guidelines of the local authority
Ans – ( D )
7. 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
Ans – ( B )
8.The process in which a chemical change takes place in a substance, when electric current is passed through it is called:
( A ) electrolysis
( B ) electrodes
( C ) thermal conduction
( D ) none of these
Ans – ( A )
9.When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates
( A ) the chemical effect of current
( B ) the heating effect of current
( C ) the magnetic effect of current
( D ) the lightning effect of current
Ans – ( A )
10. Potential difference is created in a electric circuit due to
( A ) Switch
( B ) Cell or battery
( C ) Voltmeter
( D ) Conductor
Ans – ( B )
11.Electroplating is a process which is:
( A ) magnetic effect of electricity
( B ) heating effect of electricity
( C ) chemical effect off electricity
( D ) none of these
Ans – ( C )
12.Which one of the following solutions will not conduct electricity?
( A ) Lemon juice
( B ) Vinegar
( C ) Tap water
( D ) Vegetable oil
Ans – ( D )
13. In electrolytic solutions, which of the following acts as carrier of charge?
( A ) Protons
( B ) Electrons
( C ) Neutrons
( D ) Ions
Ans – ( D )
14.Which of the fallowing liquid is poor conductor:
( A ) salty water
( B ) orange juice
( C ) lemon juice
( D ) none of these
Ans – ( A )
15.Which of the following metals is used in electroplating to make objects appear shining?
( A ) Iron
( B ) Copper
( C ) Chromium
( D ) Aluminium
Ans – ( C )
16. 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
Ans – ( A )
17.The substance which is conductor of electricity is:
( A ) rubber
( B ) paper
( C ) nails
( D ) plastic
Ans – ( C )
18. Copper is
( A ) a good conductor
( B ) an insulator
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( A )
19. Which of the appliances at your home does not run on electric current?
( A ) Television
( B ) Mixer grinder
( C ) Air conditioner
( D ) Gas burner
Ans – ( D )
20.We use magnetic needle to find the effect of:
( A ) slow electric current
( B ) small electric current
( C ) magnetism
( D ) none of these
Ans – ( B )
21.If a switch has some sparking, we will switch it off with the help of:
( A ) an iron nail
( B ) cotton cloth
( C ) wooden stick
( D ) any of ( B ) and (c)
Ans – ( D )
22. A battery is used to:
( A ) convert chemical current into electric
( B ) maintain a potential difference current
( C ) measure the current
( D ) measure the temperature
Ans – ( A )
23. The passage of an electric current through a solution causes
( A ) Heating effect
( B ) Lighting effect
( C ) Chemical effect
( D ) All of these
Ans – ( C )
24.Electroplating is a method of:
( A ) making plates
( B ) coating a metal on another metal using electric current
( C ) making plates which use electricity
( D ) making a metal with another metal
Ans – ( B )
25. 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
Ans – ( D )
26. 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
Ans – ( D )
27.Which one of the following is the insulator:
( A ) human body
( B ) paper
( C ) acid
( D ) steel
Ans – ( B )
28. When electric current is passed through the copper sulphate solution, copper sulphate dissociates into:
( A ) copper and sulphur
( B ) copper and oxygen
( C ) copper and sulphate
( D ) none of these
Ans – ( C )
29. Electroplating is based on:
( A ) magnetic effect of electricity
( B ) chemical effect of electricity
( C ) heating effect of electricity
( D ) physical effect of electricity
Ans – ( B )
30.Which liquid do not conduct electricity?
( A ) common salt solution
( B ) acidic solution
( C ) distilled water
( D ) none of these
Ans – ( C )
31. An electrolyte is
( A ) a metal
( B ) a liquid that conducts current
( C ) a non-metal
( D ) none of these
Ans – ( B )
32. Distilled water is
( A ) Poor conductor
( B ) Good conductor
( C ) Both ( A ) and (b)
( D ) None
Ans – ( A )
33. The cans, used for storing food, are made by electroplating …………. on to irons
( A ) chromium
( B ) zinc
( C ) tin
( D ) none of these
Ans – ( C )
34. A device which prevents or allow the current to flow through it
( A ) Conductor
( B ) Motor
( C ) Terminal
( D ) Switch
Ans – ( D )
35. LED glows:
( A ) when a strong electric current flows through it
( B ) whenever a weak electric current flows through it
( C ) when no electric current flows through it
( D ) none of these
Ans – ( B )
36. What is current?
( A ) The flow of matter
( B ) The flow of electrons
( C ) The flow of protons
( D ) The flow of charge
Ans – ( D )
37. Which of the following is a good conductor?
( A ) Brick
( B ) Steel
( C ) Plastic
( D ) Cotton
Ans – ( B )
38. Electric current is measured by a device
( A ) Odometer
( B ) Voltmeter
( C ) Ammeter
( D ) Galvanometer
Ans – ( C )
39. Which of the following is a good conductor of electricity:
( A ) istilled water
( B ) tap water
( C ) kerosene
( D ) none of these
Ans – ( B )
40. In battery two or more cells are connected in
( A ) Series
( B ) Random
( C ) Positive and positive terminals
( D ) Parallel
Ans – ( A )
41. Polythene is
( A ) a conductor
( B ) an insulator
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( B )
42. Which of the following liquids is a bad conductor of electricity?
( A ) Lemon juice
( B ) Vinegar
( C ) Sea water
( D ) Distilled water
Ans – ( D )
43. When current flows through a conducting solution than the electrode connected to the negati’wc terminal of the battery is called :
( A ) anode
( B ) cathode
( C ) rod
( D ) none of these
Ans – ( B )
44. Which acid is present in lemon juice that acts as an electrolyte?
( A ) Sulphuric acid
( B ) Nitric acid
( C ) Hydrochloric acid
( D ) Citric acid
Ans – ( D )
45. Current is the flow of:
( A ) electrons
( B ) protons
( C ) neutrons
( D ) none of these
Ans – ( A )
46. Which categories of substance are generally good conductors?
( A ) Insulator
( B ) Non-metals
( C ) Metals
( D ) Reflector
Ans – ( C )
47. Pure or distilled water is a
( A ) poor conductor
( B ) good conductor
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( A )
48. An electric lamp glows due to
( A ) Chemical effect
( B ) Magnetic effect
( C ) Heating effect
( D ) None
Ans – ( C )
49. Which of the following is a good conductor?
( A ) Brick
( B ) Steel
( C ) Plastic
( D ) Cotton
Ans – ( B )
50. 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
Ans – ( C )
51. Magnetic compass connected In a circuit is used to check:
( A ) magnetism in electric current
( B ) slow current
( C ) small current
( D ) none of these
Ans – ( C )
52. 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.
Ans – ( D )
53. Which of the following is a bad conductor of electricity?
( A ) Distilled water
( B ) Silver nitrate
( C ) Sulphuric acid
( D ) Copper sulphate
Ans – ( A )
54. What is the common name for manganese-dioxide-alkaline-zinc cell?
( A ) Moz cell
( B ) Long life cell
( C ) Manganese-dioxide
( D ) Alkaline cell
Ans – ( D )
55.The negative charged ions are called:
( A ) cations
( B ) anions
( C ) ions
( D ) none of these
Ans – ( A )
56. Which of the following is an insulator?
( A ) Wood
( B ) Iron
( C ) Graphite
( D ) Silver
Ans – ( A )
57.Kerosene is
( A ) electrolyte
( B ) non-electrolyte
( C ) electrode
( D ) none of these
Ans – ( A )
58. In electric circuit, current flows due to
( A ) Difference in temperature
( B ) Same potential difference
( C ) Difference in potential difference
( D ) Difference in current
Ans – ( C )
59.The cans, used for storing food, are made by electroplating ……………. on to irons
( A ) chromium
( B ) zinc
( C ) tin
( D ) none of these
Ans – ( C )
60. 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
Ans – ( C )
61.Car parts, bath taps, kitchen gas burners, bicycle handlebars arc electroplated with:
( A ) chromium
( B ) zinc
( C ) tin
( D ) none of these
Ans – ( A )