Current Electricity
ICSE · Class 9 · Physics
Practice quiz for Current Electricity — ICSE Class 9 Physics. MCQs and questions with answers to test your preparation.
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What is the SI unit of electric current?
The formula for electric current is I = Q/t. Here Q represents:
What is the potential difference between two points if 6 joules of work is done to move 2 coulombs of charge?
Which instrument is used to measure electric current in a circuit?
Sample Questions
Which of the following are sources of direct current (DC)?
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Dry cell, Car battery, Mobile phone battery
Dry cell, car battery, and mobile phone battery are all sources of DC. House mains supply and AC generator provide alternating current (AC).
An insulator does not allow current to flow through it.
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True
True. Insulators like rubber, plastic, and glass do not allow current to flow through them because they have very few free electrons.
According to Ohm's law, if voltage increases and resistance remains constant, what happens to current?
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Current increases
According to Ohm's law V = IR, current I = V/R. If voltage increases and resistance is constant, current increases proportionally.
Primary cells can be recharged after use.
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False
False. Primary cells cannot be recharged. They are 'use and throw' type cells. Only secondary cells (accumulators) can be recharged.
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