CBSE Questions for Class 8 Physics Chemical Effects Of Electric Current Quiz 1 - MCQExams.com

Pure water is a ________ conductor of electricity.
  • good
  • bad
  • semi
  • none of the above
Which of the following is a poor conductor of electricity?
  • Distilled water
  • Tap water
  • Sea water
  • Drinking water
Why is a layer of zinc coated on iron?
  • To protect it from corrosion
  • To reduce on cost
  • To make it appear shining
  • All of the above
When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates
  • the chemical effect of current.
  • the heating effect of current.
  • the magnetic effect of current.
  • the lightning effect of current.
Chromium has a shiny appearance and lt does not corrode
  • True
  • False
  • Ambiguous
  • Data insufficient
Electroplating does not help
  • fine finish to the surface
  • shining appearance
  • metals to become hard
  • protect metals against corrosion
Boojhos uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
  • in the nearby river.
  • in the nearby pond.
  • in the nearby cornfield.
  • according to the disposal guidelines of the local authority.
Which of the following substance upon dissolving a small amount in pure water, the resultant solution starts conducting electricity?
  • NaCl
  • sugar
  • kerosene
  • oxygen
One of the most common applications of chemical effect of electric current is ______________.
  • electroplating
  • chemical etching
  • electric shielding
  • none of these.
_________ plating is done on objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims because of its shiny appearance
  • Chromium
  • Nickel
  • Carbon
  • None of these
A coating of zinc is deposited on iron to protect it from __________.
  • rain
  • corrosion
  • sun
  • none of these
The process of depositing a layer of any desired metal on another material by means of electricity is called __________.
  • $$electrothreading$$
  • $$electrofocussing$$
  • $$electroplating$$
  • None of these
Which of the following is not fluid?
  • Tap water, vinegar
  • Tap water, vegetable oil
  • Tap water, honey
  • Bread, Biscuit
Which of the following is used to detect electric current?
  • Tester
  • LED
  • Compass needle
  • All of the above
Electroplating is a very useful process widely used in industry for coating metal objects with a thin layer of :
  • Metals
  • Non-metals
  • Alloy
  • Salts
Non electrolyte solution is a chemical compound which :
  • Contains ions
  • Conducts electricity
  • Does not conduct electricity
  • None of the above
In charging a battery of motor car, which of the following effect of electric current is used?
  • heating
  • magnetic
  • chemical
  • induction
Which plating is done on bicycle handle bars and wheel rims?
  • Iron plating
  • Gold plating
  • Silver plating
  • Chromium plating
Tin cans used for storing food, are made by electroplating tin onto :
  • iron
  • gold
  • silver
  • copper
In electroplating of the silver spoon with gold, the silver spoon is cleaned with a dilute acid solution to remove the  _________  from its surface.
  • oxide layer
  • chloride layer
  • silver layer
  • gold layer
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