Pakistan MCQs

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.

Rayleigh scattering is stronger for shorter visible wavelengths.
Scattered blue light reaches observers from many directions.

At boiling, vapor bubbles form throughout the liquid.
It occurs when vapor pressure matches external pressure.

Sunlight travels through more atmosphere near the horizon.
Much of the shorter-wavelength light is scattered away.

Atmospheric pressure decreases with altitude.
Lower pressure allows water to boil at a lower temperature.

Sound begins with vibrating matter.
It travels through a medium as pressure variations.