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CBSE Questions for Class 8 Physics Chemical Effects Of Electric Current Quiz 4 - MCQExams.com
CBSE
Class 8 Physics
Chemical Effects Of Electric Current
Quiz 4
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?
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Tin is less reactive than Iron
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Tin is more reactive than Iron
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Tin is cheaper than Iron
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Tin is lighter than Iron
Explanation
Tin cans are thin electroplated on iron. These tin cans are used to preserve food items. Because tin is less reactive than iron as it will prevent food from being poisoned.
To deposit the copper on the iron spoon, the copper plate is to be connected:
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With the iron spoon
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With the positive terminal
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With the negative terminal
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Between the positive and negative terminal of battery.
Explanation
In order to deposit the copper on the iron spoon, $$Cu^{2+}$$ present in the solution should deposit to iron spoon and we know that
$$Cu^{2+}$$ will move toward negative terminal as it is positively charged. So
the iron spoon is to be connected with negative terminal and $$\mathbf{Copper}$$ plate
is to be connected with
$$\mathbf{positive}$$ terminal.
Therefore, B is correct option.
Electroplating does not help in
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Fine finish to the surface
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Shining appearance
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Metals to become hard
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Protect metal against corrosion
Explanation
Electroplating only provides a thin deposition of a metal on the surface which in no way can give hardness to the metal. Electroplating does not help in making a m
etal hard.
The diagram shows apparatus for plating a spoon with silver.
Which statement is not correct?
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Silver would stick to the spoon because it is a very reactive metal
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The electrolyte would be a silver salt dissolved in water
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The metal electrode would be made from silver
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The spoon would be connected to the negative terminal of the power supply
Explanation
Silver would stick to the spoon because it is a very reactive metal.
When a direct current is passed through the cell, positive silver ions $$\left( {Ag}^{+} \right)$$ to the negative anode, i.e., spoon, where they are neutralized by electrons and stick to the spoon as silver metal.
Hence, option A is correct.
Electric bulb glow due to the chemical effect of electricity.
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True
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False
Chromium plating is done on many articles so that they
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Have shiny appearance
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Do not corrode
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Resist Scratches
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All of these
Explanation
For improved wear and corrosion resistance, it's tough to beat hard chrome
plating
. ... A chrome surface also resists corrosion, making it suitable for use in harsh environments or where other
plating
materials would wear away, exposing the substrate metal to corrosion attack.it also make shiny appearance and resist scratches.
Therefore, D is correct option.
The most common industrial application of chemical effects of electric current is:
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electroplating
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electrolysis
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anodising
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galvanising
Explanation
The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. it is one of the most common application of chemical effects of electric current
Who among the following scientists made the statement –"Chemical
change can produce electricity"?
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Galvani
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Faraday
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Coulomb
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Thomson
Explanation
Galvani said Chemical change can produce electricity.
Hence option A is correct.
By which instrument the presence of magnetic field can be determined?
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Voltmeter
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Ammeter
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Galvanometer
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Magnetic needle
Explanation
D. 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
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Vinegar
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Brine solution
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Honey
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