CBSE Questions for Class 8 Physics Chemical Effects Of Electric Current Quiz 2 - MCQExams.com

Why are objects electroplated?
  • To protect it from corrosion.
  • To prevent spoilage of objects.
  • To make it appear shining.
  • All of the above
The process in which a layer of one metal is coated with another metal by electrolysis is called:
  • Electroplating
  • Electrorefining
  • Electropathy
  • Electrostatics
The process of depositing a layer of gold on silver is known as:
  • Silver plating
  • Electrolysis
  • Electroplating
  • None of these
In electroplating of a silver spoon with gold, the gold plate is connected to:
  • The negative terminal of the battery
  • The positive terminal of the battery
  • Both positive and negative terminals of the battery
  • None of these
Which one of the following scientists showed that if electrodes are immersed in water and a current was passed, bubbles of oxygen and hydrogen were produced?
  • William Thomson
  • William Nicholson
  • William Watson
  • William Harvey
In charging a battery of motor-car, which of the following effect of electric current is used?
  • Magnetic
  • Heating
  • Chemical
  • Induction
An electric current can produce
  • heating effect only.
  • chemical effect only.
  • magnetic effect only.
  • chemical, heating, and magnetic effects.
Of the following, the one that does not make use of chemical effect of electric current is :
  • Electroplating
  • Electrotyping
  • Thermoelectric refrigerator
  • Voltaic cells
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 while it glows very dimly for liquid B. You would conclude that
(i) liquid A is a better conductor than liquid B.
(ii) liquid B is a better conductor than liquid A.
(iii) both liquids are equally conducting.
(iv) conducting properties of liquid cannot be compared in this manner
  • (i) is correct
  • (ii) is correct
  • (iii) is correct
  • (iv) is correct
What will happen, When an electric current is passed through a conducting solution?
  • heating of solution
  • chemical reactions within the solution
  • cooling of solution
  • increase in resistance
Electroplating does not help in:
  • fine finish to the surface
  • shining appearance
  • metals to become hard
  • protect metals against corrosion
Which of the following metals is used in electroplating to make objects appear shining?
  • iron
  • copper
  • chromium
  • aluminium
Electroplating can be done by :
  • Copper
  • Silver
  • Chromium
  • All of these
Tin cans, used for storing food are made by electroplating:
  • Chromium onto tin
  • Iron onto tin
  • Tin onto iron
  • Chromium onto iron
Metal used in electroplating is:
  • Zinc
  • Iron
  • gold
  • None of these
In LEDs, the longer lead is connected to ................ and the shorter lead is connected to ...................
  • Negative terminal, Positive terminal
  • Positive terminal, Negative terminal
  • Negative terminal, Neutral terminal
  • Positive terminal, Neutral terminal
Which of the following is not true about LED?
  • There are two wires (called leads) attached to an LED.
  • While connecting to a circuit, the longer lead of LED is always connected to the positive terminal of the battery.
  • While connecting to a circuit, the shorter lead of LED is always connected to the positive terminal of the battery.
  • LED can be used to detect weak current.
What happens when you join the free ends of the tester for more than a few minutes?
  • Cells of the battery will drain quickly.
  • The current will not be able to pass.
  • There would be no conduction of electricity.
  • All of the above
An experiment is being conducted to test the conduction of electricity through vegetable oil as shown in image. Which of the following statement(s) is correct?
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  • The liquid (vegetable oil) allows the electric current to pass through. Since, it is a good conductor of electricity.
  • The circuit of the tester is complete but the bulb does not glow.
  • The circuit of the tester is not complete and hence the bulb does not glow.
  • Both A and B
Galvanized iron is coated with a thin coating of
  • Copper
  • Tin
  • zinc
  • Aluminium
  • White lead
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