Pakistan MCQs

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.

The highest-energy water molecules escape during evaporation.
This lowers the average energy and temperature of the skin.

Violet light has the shortest wavelength among visible colors.
It also has the highest visible-light frequency.

Wind carries away water vapor near the fabric.
This maintains a concentration difference and speeds evaporation.

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.