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8th Jammu and Kashmir Board
IMPORTANT
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If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the  terminal of the battery.

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Important Questions on Chemical Effects of Electric Current

MEDIUM
8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 2
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
MEDIUM
8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 3

Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect.

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MEDIUM
8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 4
The bulb does not glow in the setup shown in figure. List the possible reasons. Explain your answer.
HARD
8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 5
A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that
EASY
8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 6
Does pure water conduct electricity? If not, what can we do to make it conducting?
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8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 7
In case of a fire, before the firemen use the water hoses they shut off the main electrical supply for the area. Explain why they do this.
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8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 8
A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
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8th Jammu and Kashmir Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS 8>Chapter 8 - Chemical Effects of Electric Current>Exercises>Q 9
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.