Explanation

A real gas can be approximated to an ideal gas at low density.

This is typically achieved under conditions of low pressure and high temperature. 

Explanation

The resolving power of a telescope is its ability to produce separate images of two closely spaced objects, like two distant stars.

It is directly proportional to the diameter (aperture) of the objective lens or mirror.

Explanation

When white light passes through a prism, different wavelengths bend by different amounts.

This dispersion due to refraction splits light into seven colors (VIBGYOR).

Explanation

Explanation

Damping is the process in which oscillation amplitude decreases due to energy loss (like friction or resistance).

It gradually reduces the motion of the system.

Explanation

Viscosity is the internal friction that resists the relative motion of fluid layers.

It measures how “thick” or resistant to flow a fluid is.

Explanation

Seaweeds, especially brown algae, accumulate iodine from seawater.

They are the primary natural source of iodine used in medicine and industry.

Explanation

Potassium is a highly reactive alkali metal and reacts violently with water and air.

Storing it under kerosene prevents contact with moisture and oxygen, keeping it safe.

Explanation

Isotonic solutions have equal osmotic pressure, which depends on molar concentration of solute particles.

Thus, solutions with the same molar concentration (not just molarity/normality) are isotonic.

Explanation

Osmotic pressure (π) is directly proportional to solute concentration (π = iCRT).

More solute molecules → higher concentration → greater osmotic pressure.