Pakistan MCQs

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.

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.

Boiling water is cooler at high altitude.
The lower cooking temperature slows many cooking processes.

Sound requires particles to transmit vibrations.
A vacuum contains too few particles for sound propagation.

Thermal radiation travels as electromagnetic waves.
It does not require a material medium.

Pressure inside the cooker increases above atmospheric pressure.
Water then boils at a higher temperature and cooks food faster.

Pitch rises as vibration frequency increases.
Low frequencies produce lower-pitched sounds.