Chemical Effects Of Electric Current Mock Tests

24 questions available

Chemical Effects Of Electric Current Mock Test 1

Questions: 24

Sample Questions

Class 8 Science

Which of the following is a non-conductor of electricity?

A Distilled water

B Sea water

C Acidic solution

D Basic solution

Class 8 Science

Which of the following statements about electroplating is correct?

A It uses chemical reactions to decompose water into hydrogen and oxygen

B It deposits a thin layer of one metal onto another metal using electric current

C It generates electricity from chemical reactions in a battery

D It measures the temperature of a conducting solution

Class 8 Science

When electric current is passed 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 is passed through water containing a small amount of sulphuric acid, bubbles form at both electrodes. This process is called:

A Electroplating

B Electrolysis

C Electromagnetic induction

D Conduction

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 chemical is used for disinfecting drinking water?

A Chlorine

B Sodium chloride

C Iron sulphate

D Calcium carbonate

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 iron objects is done mainly to:

A Make the iron lighter

B Prevent corrosion and give a shiny appearance

C Increase the electrical resistance of iron

D Make the iron more brittle

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