Pakistan MCQs

Linear speed is v=rω.
V=0.5×8 = 4 m/s.

Crystalline solids have repeating lattice structures.
They often have sharp melting points.

Glass is a common amorphous solid.
Such solids often soften over a temperature range.

The solvent is usually the component in larger amount.
The solute is dispersed at the molecular or ionic level.

Solubility depends on temperature and the nature of solute and solvent.
For gases, pressure also matters.

A saturated solution is in equilibrium with undissolved solute.
Additional solute will not dissolve under unchanged conditions.

More solute can dissolve in an unsaturated solution.
Its concentration is below the solubility limit.

Solid particles occupy fixed average positions.
They still vibrate about those positions.

Dalton's law treats each ideal gas independently.
Total pressure is the sum of partial pressures.

A liquid takes the shape of its container.
Its particles remain close but can flow past one another.

Particles move from regions of higher concentration toward lower concentration.
Diffusion occurs in gases, liquids, and solids.

A gas expands to fill its container.
Its particles are widely separated and move rapidly.