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Test: Chemical Effects of Electric Current- 2 - Class 8 MCQ


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10 Questions MCQ Test Science Class 8 - Test: Chemical Effects of Electric Current- 2

Test: Chemical Effects of Electric Current- 2 for Class 8 2024 is part of Science Class 8 preparation. The Test: Chemical Effects of Electric Current- 2 questions and answers have been prepared according to the Class 8 exam syllabus.The Test: Chemical Effects of Electric Current- 2 MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Effects of Electric Current- 2 below.
Solutions of Test: Chemical Effects of Electric Current- 2 questions in English are available as part of our Science Class 8 for Class 8 & Test: Chemical Effects of Electric Current- 2 solutions in Hindi for Science Class 8 course. Download more important topics, notes, lectures and mock test series for Class 8 Exam by signing up for free. Attempt Test: Chemical Effects of Electric Current- 2 | 10 questions in 10 minutes | Mock test for Class 8 preparation | Free important questions MCQ to study Science Class 8 for Class 8 Exam | Download free PDF with solutions
Test: Chemical Effects of Electric Current- 2 - Question 1
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How can we detect a weak current using a tester?

Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 1
We can detect a weak current using a tester by using a LED instead of a bulb, as LEDs can glow even with a small current, making it easier to detect weak currents.
Test: Chemical Effects of Electric Current- 2 - Question 2
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Why is it necessary to wipe dry the ends of the tester before testing a new liquid?

Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 2
It is necessary to wipe dry the ends of the tester before testing a new liquid to prevent mixing of liquids, which could affect the results and accuracy of the conductivity test.
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Test: Chemical Effects of Electric Current- 2 - Question 3
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Electric circuit provides a complete path for

Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 3

The close and continuous path of electric current is called electric circuit. Electric circuit provides a complete path for current to flow.

Test: Chemical Effects of Electric Current- 2 - Question 4
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What does the presence of mineral salts in natural water contribute to?
Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 4
The presence of mineral salts in natural water contributes to its good conductivity, making it a better conductor of electricity than distilled water.
Test: Chemical Effects of Electric Current- 2 - Question 5
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The bulb glows when the electric current passes through it due to
Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 5

When electric current passes through the filament of bulb get heated and start emitting light and heat energy. So, heating effect of electric current is applied in bulb.

Test: Chemical Effects of Electric Current- 2 - Question 6
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In battery two or more cells are connected in
Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 6

2 or 3 cells are combined and connected electrically in series and have two main terminals: positive and negative terminals. 

Test: Chemical Effects of Electric Current- 2 - Question 7
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Which metal is electroplated on iron for making “cans” for storing food and drinks?
Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 7

Tin is electroplated on iron for making cans for storing food and drinks as tin is less reactive than iron.

Test: Chemical Effects of Electric Current- 2 - Question 8
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When the liquid between two ends allow electric current, then
Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 8

When the liquid between two ends allow electric current to pass through them, the bulb of tester blows.

Test: Chemical Effects of Electric Current- 2 - Question 9
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What happens to a compass needle when current flows through a nearby wire?
Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 9
A compass needle deflects when current flows through a nearby wire due to the magnetic effect of the electric current, indicating the presence of the current.
Test: Chemical Effects of Electric Current- 2 - Question 10
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Which of the following is a poor conductor of electricity?
Detailed Solution for Test: Chemical Effects of Electric Current- 2 - Question 10

Tap water, iron nail and steel spoon are good conductor of electricity but air is poor conductor of electricity.

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