CBSE Questions for Class 8 Physics Chemical Effects Of Electric Current Quiz 4 - MCQExams.com

Tin cans are the tin electroplated on iron. These Tin cans are used to preserve food items. Why not iron cans used without Tin coating?
  • Tin is less reactive than Iron
  • Tin is more reactive than Iron
  • Tin is cheaper than Iron
  • Tin is lighter than Iron
To deposit the copper on the iron spoon, the copper plate is to be connected:
  • With the iron spoon
  • With the positive terminal
  • With the negative terminal
  • Between the positive and negative terminal of battery.
Electroplating does not help in
  • Fine finish to the surface
  • Shining appearance
  • Metals to become hard
  • Protect metal against corrosion

The diagram shows apparatus for plating a spoon with silver.

Which statement is not correct?

1646768_aca9d73dd5074e2db7fe09c0fb2d1e8f.png
  • Silver would stick to the spoon because it is a very reactive metal
  • The electrolyte would be a silver salt dissolved in water
  • The metal electrode would be made from silver
  • The spoon would be connected to the negative terminal of the power supply
Electric bulb glow due to the chemical effect of electricity.
  • True
  • False
Chromium plating is done on many articles so that they 
  • Have shiny appearance
  • Do not corrode
  • Resist Scratches
  • All of these
The most common industrial application of chemical effects of electric current is:
  • electroplating
  • electrolysis
  • anodising
  • galvanising
Who among the following scientists made the statement –"Chemical change can produce electricity"?
  • Galvani
  • Faraday
  • Coulomb
  • Thomson
By which instrument the presence of magnetic field can be determined?
  • Voltmeter
  • Ammeter
  • Galvanometer
  • Magnetic needle
Look at the given figure.
Initially, the ammeter did not show any flow of current. When a few drops of dil. sulphuric acid was added to liquid Z, the ammeter showed deflection. Identify liquid Z.

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  • Pure water
  • Vinegar
  • Brine solution
  • Honey
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