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Test: Electric Current & its Effects - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Electric Current & its Effects

Test: Electric Current & its Effects for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Electric Current & its Effects questions and answers have been prepared according to the UPSC exam syllabus.The Test: Electric Current & its Effects MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electric Current & its Effects below.
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Test: Electric Current & its Effects - Question 1

A device which prevents or allows the current to flow through it

Detailed Solution for Test: Electric Current & its Effects - Question 1

A circuit breaker can be used over and over again. The basic circuit breaker consists of a simple switch, connected to an electromagnet.

Generally electrical current requires a close path or circuit to flow, so when switch is off it won't flow. A switch prevents or allow the current to flow through it.

Test: Electric Current & its Effects - Question 2

What is the function of a switch in an electric circuit?

Detailed Solution for Test: Electric Current & its Effects - Question 2

The correct answer is C: It opens or closes the circuit.
Solution:
- A switch in an electric circuit is a device used to control the flow of electricity.
- When the switch is closed, it completes the circuit, allowing electric current to flow.
- When the switch is open, it breaks the circuit, stopping the flow of electricity.
- This functionality allows users to turn electrical devices on and off.
 

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Test: Electric Current & its Effects - Question 3

Filament of electric bulb is made up of

Detailed Solution for Test: Electric Current & its Effects - Question 3

Filament of electric bulb is made up of tungsten, an alloy of metals having very high melting point.

Test: Electric Current & its Effects - Question 4

Electric current is the flow of

Detailed Solution for Test: Electric Current & its Effects - Question 4

Electric current originates because of the flow/drift of electrons and its direction is opposite to the direction of flow of electrons.

Test: Electric Current & its Effects - Question 5

Which device is commonly used to prevent electrical circuits from overheating and causing fires?

Detailed Solution for Test: Electric Current & its Effects - Question 5
  • An electric fuse is a safety device used to prevent electrical circuits from overheating and causing fires. It acts like a barrier that breaks the circuit if the current exceeds a safe limit, protecting the wires and devices. 
Test: Electric Current & its Effects - Question 6

Electrons are __________ particles.

Detailed Solution for Test: Electric Current & its Effects - Question 6

Electrons are negatively charged particles.

Test: Electric Current & its Effects - Question 7

1. What is the unit of electric current?

Detailed Solution for Test: Electric Current & its Effects - Question 7

The unit of electric current is the ampere (A).

  • Electric current measures the flow of electric charge in a circuit.
  • The ampere, named after André-Marie Ampère, is the standard unit for current.


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Test: Electric Current & its Effects - Question 8

What does a longer line represent in the symbol of an electric cell?

Detailed Solution for Test: Electric Current & its Effects - Question 8
  • In the symbol of an electric cell, a longer line represents the positive terminal. This terminal is where the electric current flows out of the cell. Just like a plus sign (+) means addition, the longer line in the symbol of an electric cell shows the positive side where electricity comes out.
Test: Electric Current & its Effects - Question 9
What happens to a compass needle when placed near a current-carrying wire?
Detailed Solution for Test: Electric Current & its Effects - Question 9
When a current flows through a wire, it creates a magnetic field around it, causing a nearby compass needle to deflect from its usual north-south alignment.
Test: Electric Current & its Effects - Question 10

When two or more cells are joined together, it forms a

Detailed Solution for Test: Electric Current & its Effects - Question 10

When two cells are joined together via connecting wires in such a way that the positive end of one cell is joined the negative end of another cell. This arrangement is called a battery. Thus, a battery is a combination of two or more cells.

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