PMS MCQs

Bats emit high-frequency sound pulses and detect returning echoes.
This helps them navigate and locate prey.

Electric current measures charge passing a point per unit time.
Its SI unit is the ampere.

Electric current is measured in amperes.
An ampere equals one coulomb of charge per second.

Voltage represents energy transferred per unit charge.
It drives current through a circuit.

Resistance is measured in ohms.
It describes opposition to electric current.

Copper contains mobile electrons that carry current easily.
It is widely used in electrical wiring.

Plastic resists the movement of electric charge.
The covering protects users from electric shock.

A fuse melts when excessive current heats it.
This interrupts the circuit and helps prevent fire or damage.

Parallel branches have the same potential difference.
Switching off one appliance does not stop current in the others.

An electric motor uses magnetic forces on current-carrying conductors.
It converts electrical energy into motion.

A generator uses electromagnetic induction.
Mechanical motion produces electrical energy.

Lightning tends to strike exposed high points and conductors.
Safer shelter is inside a substantial building or closed vehicle.