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MCQ on Chemical Effects of Electric Current-CBSE-Class VIII

mcq_electrictyMCQ or Multiple choice questions on chemical effects of electricity is for class VIII students of CBSE board. It must be noted that the world today is based in power of electricity and uses various effects of electricity. Electricity is  a very powerful source of energy and can easily transform into another form of energy , which is then easily can be transmitted to various parts of geography . In order to understand the properties of electricity, its various effects need deeper study.

The set of 10 questions however are restricted to the chemical effect of electricity which is a chapter in CBSE book for class VIII students .

Video on Chemical Effects of Electric Current

 

MCQ on Chemical Effect-CBSE

Chemical Effects of Electric Current

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Question 1
Which one of the following is bad conductor of electricity?
A
Distilled Water
B
Alcohal
C
Salt Water
D
Tap Water
Question 1 Explanation: 
Distilled water is free of salts , therefore poor conductor
Question 2
When electric current is passed through copper sulphate solution, the copper deposits on the electrode connected to ...................
A
positive terminal of battery
B
Negative terminal of battery
C
Any terminal can be chosen
Question 3
When electric current is passed through a bulb, the bulb gives light because of ............
A
electric effect ocurrent
B
heating effect of current
C
glowing effect of current
D
Lighting effect of current
Question 3 Explanation: 
The heating effect of current increases the temprature of special wire used in Bulb called Ni-chrome, which glows after getting a particular amount of heat which is supplied by passing current
Question 4
What is resistance of a conductor?
A
When there are more atoms and molecules in conductor than free electrons, so as to restrict movement of electrons on getting current.
B
When there are more free electrons than molecules and there is no restriction in movement of electrons on getting current.
C
When conductor has equal amount of free electrons and atoms and molecules
Question 4 Explanation: 
Two more things should be known to you: 1. More resistance of conductor , produces more heat , because of more friction between free electrons and atoms and molecules and 2. The resistance of a conductor is directly proportional to length of a conductor and inversely proportional to its area of cross section .
Question 5
The process of producing chemical decomposition of a compound by passing electricity through the compound is called ................
A
electrolysis
B
electroplating
C
electrolyte
D
None of the above
Question 5 Explanation: 
The compound through which the current passes is called Electrolyte.
Question 6
When current is passed through calculated water , the Hydrogen and Oxygen separates . The hydrogen gets accumulated on the negative electrode . Why does it not deposit on positive electrode?
A
Hydrogen is positive charge.
B
Hydrogen is negatively charged
C
That is because , it is the characteristic of acidulated water.
D
None of the above
Question 6 Explanation: 
Opposite charged ends attract to each other. In H2O , the hydrogen is positive charged , therefore it is attracted to negatively charged electrodes, whereas Oxygen being negatively charged ion , gets attracted to positive electrode.
Question 7
The filament used in in electric heater is of high resistance ?
A
True
B
False
Question 7 Explanation: 
High resistance means high heat producing capacity when electric current passes. Therefore, the filament of a electric heater is of very high resistance.
Question 8
Why is Mica sheets used in an Iron instruments ?
A
Mica is good conductor of elctricity
B
Mica is bad conductor of electricity and heat.
C
Mica is bad conductor of electricity but good conductor of heat
D
Mica is very light and bad conductor of electricity.
Question 9
Which property of the electricity is responsible for use of Fuse wire in household wiring?
A
Chemical effect
B
Heating effect
C
Magnetic efefct
D
All of above
Question 9 Explanation: 
The Fuse wire connection are in between the appliance and main line. It is are very thin wire and when very high current passes through it suddenly, the fuse wire gets heated and melts due to the produced heat. This saves the household appliances
Question 10
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?
A
Tin is less reactive than Iron.
B
Tin is more reactive than Iron
C
Tin is cheaper than Iron
D
Tin is lighter than Iron
Question 10 Explanation: 
Tin is less reactive than Iron , therefore food items does not react with the container and remain good for long. If iron is used to preserve food, the food item containing water will react with iron and get spoilt.
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Watch the excellent video introduction on electricty