PMS Everyday Science MCQs

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.

Archimedes' principle relates buoyant force to displaced fluid.
The upward force equals the weight of the displaced fluid.

A ship contains large air-filled spaces.
Its total mass spread over its volume gives an average density below water.

Density compares mass with the space occupied.
It is calculated as mass divided by volume.

Ice has an open crystal structure that occupies more volume.
Its lower density causes it to float on water.

Freezing expands water into a less dense solid structure.
The resulting ice is buoyant in liquid water.