Pakistan MCQs

Newton's third law describes paired interaction forces.
Each force is matched by an equal force in the opposite direction.

Solar cells use the photovoltaic effect.
They convert light directly into electrical energy.

The rocket pushes exhaust gases downward.
The gases exert an equal and opposite force on the rocket.

A microphone detects sound vibrations.
It converts them into corresponding electrical signals.

Pressure is force distributed over an area.
The same force produces greater pressure on a smaller area.

A loudspeaker uses electrical signals to move a diaphragm.
The diaphragm produces sound waves in air.

A sharp edge concentrates force over a small area.
This creates greater pressure and makes cutting easier.

Heat flows from a hotter body to a cooler body.
It is energy in transit rather than a material substance.

Average speed is total distance divided by total time.
Thus, 120 ÷ 2 = 60 km/h.

Gravity attracts masses toward one another.
Near Earth, it pulls objects toward the ground.

Gravity continuously accelerates the ball downward.
After slowing to a stop, it begins falling.

Friction resists sliding or rolling between surfaces.
It can produce heat and slow moving objects.