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Chemical Effects Of Electric Current Mock Tests

24 questions available

Chemical Effects Of Electric Current Mock Test 1

Questions: 24

नमूना प्रश्न

Class 8 Science
When electric current passes through copper sulphate solution using copper electrodes, copper gets deposited on the:
A Positive electrode (anode)
B Negative electrode (cathode)
C Both electrodes equally
D Neither electrode
Class 8 Science
When an electric current passes through a conducting solution, which effect is observed?
A Heating effect only
B Chemical effect
C Magnetic effect only
D Lighting effect
Class 8 Science
Which of the following is used for electroplating silver onto a metal object?
A Silver nitrate solution
B Copper sulphate solution
C Salt water
D Acetone
Class 8 Science
When zinc reacts with dilute sulphuric acid, which gas is evolved?
A Oxygen
B Hydrogen
C Nitrogen
D Carbon dioxide
Class 8 Science
What happens to the resistance of a conductor when its temperature increases?
A Resistance decreases
B Resistance increases
C Resistance remains the same
D Resistance becomes zero
DSC Science
Electroplating of chromium on automotive parts is done mainly to:
A Increase the weight of the parts
B Improve appearance and provide corrosion resistance
C Decrease the cost of the parts
D Make the parts non-conducting
Class 8 Science
The process of depositing a layer of zinc on iron is called:
A Galvanisation
B Crystallisation
C Distillation
D Vulcanisation
Class 8 Science
Electroplating with chromium on car parts serves which purpose(s)?
A Only decorative appearance
B Only to increase weight
C Both decorative appearance and corrosion protection
D Only to conduct electricity

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