Electromagnetism and Its Applications Quiz

What is the primary use of a lifting magnet?

• To break circuits

• To lift ferromagnetic materials like scrap iron

• To move non-magnetic materials

• To generate electricity

Which of the following materials can be moved using a lifting magnet?

• Wood

• Plastic

• Rock

• Iron

What component of the electric bell strikes the gong to produce sound?

• The spring

• The switch

• The soft iron core

• The hammer

How does the electric bell stop the current flow temporarily?

• By turning off the power source

• By using a capacitor

• By disconnecting the circuit with a switch

• By using a resistor

What happens when the hammer of an electric bell hits the gong?

• The electromagnet is deactivated permanently

• The current increases

• The circuit is disconnected

• The circuit remains connected

What is the main function of a circuit breaker?

• To automatically cut off current when it becomes too high

• To convert AC to DC

• To increase current flow

• To provide a constant power supply

What triggers a circuit breaker to disconnect the circuit?

• A decrease in current

• An increase in current

• A constant current flow

• A decrease in voltage

How is the circuit reconnected after a circuit breaker has been triggered?

• By waiting for a reset period

• By turning off the main power

• By pushing a button

• By replacing the circuit breaker

What role does the soft iron armature play in a circuit breaker?

• It acts as a resistor

• It increases the current

• It holds the switch in place

• It generates electricity

What happens to the magnet in a circuit breaker when the current becomes too high?

• It becomes a stronger magnet

• It stops functioning

• It becomes weaker

• It reverses polarity