EASY
8th CBSE
IMPORTANT
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What is the advantage of using LED in testing the electrical conductivity of liquids ?

Important Questions on Chemical Effects of Electric Current

EASY
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 29
Which effect of electric current is utilised for detecting the flow of current through a solution when a torch bulb is used?
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 29
Which effect of electric current is utilised for detecting the flow of current through a solution when a compass is used ?
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 30
What happens to the needle of a compass kept nearby when electric current is switched on in a wire? Why does this happen?
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 31
Explain why, distilled water does not conduct electricity but tap water conducts some electricity.
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 32
Distilled water does not conduct electricity. What substances can be added to distilled water in small amounts to make it a good conductor of electricity? Why?
EASY
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 33
Which of the two is a better conductor of electricity: drinking water (tap water) or sea water? Give reason for your answer.
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 34
Why does a brand-new bicycle have shining handle-bar and wheel rims? What will happen if these are accidentally scratched?
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 14 - Chemical Effects of Electric Current>Short Answer Type Questions>Q 35
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.