PMS MCQs

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.

Pressure is measured in pascals.
One pascal equals one newton per square metre.

Temperature indicates how energetic particle motion is on average.
It determines the direction of heat flow.

Pascal's law states that pressure applied to a confined fluid is transmitted equally.
This allows force multiplication in hydraulic brakes.

Spontaneous heat transfer occurs from higher to lower temperature.
It continues until thermal equilibrium is approached.

Water exerts an upward buoyant force on immersed objects.
Floating occurs when this force balances the object's weight.

Conduction transfers thermal energy through particle interactions.
It is especially important in solids.