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 chemical is used for disinfecting drinking water?

A Chlorine

B Sodium chloride

C Iron sulphate

D Calcium carbonate

Class 8 Science

When zinc granules react with dilute sulphuric acid, hydrogen gas is produced. The correct observation is:

A Brown gas is evolved

B Blue colour develops

C Bubbles of gas form on zinc surface

D Zinc dissolves without any change

Class 8 Science

When zinc reacts with dilute sulphuric acid, which gas is evolved?

A Oxygen

B Hydrogen

C Nitrogen

D Sulphur dioxide

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 the correct chemical formula for water?

A HO

B H₂O

C H₂O₂

D OH

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 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

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