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

In a vacuum, sound cannot travel at all (velocity = 0 m/s) because it needs a medium.

Electromagnetic waves (infrared, microwave, ultraviolet) all travel at the speed of light in vacuum.

Explanation

Aristotle (384–322 BC) wrote Physica, considered the first systematic book on physics.

It dealt with motion, elements, and natural laws, laying the foundation of classical science.

Explanation

Rule 1: Non-zero digits are always significant.

In the number 1.035, the digits 1, 3, and 5 are all non-zero and therefore significant.

Rule 2: Zeros between non-zero digits are significant.

The zero between the 1 and the 3 is a captive zero, which means it is significant.

This gives a total of four significant figures (1, 0, 3, 5). 

Explanation

According to Graham’s law of diffusion, gases with lower molar mass diffuse faster.

Neon (molar mass 20 g/mol) is lighter than CO₂ (44 g/mol), so it diffuses more quickly.

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

Calorie is a larger unit of energy.

1 Calorie ≈ 4.184 Joules.

1 Joule = 10⁷ Ergs.

1 Electron Volt (eV) = 1.602 × 10⁻¹⁹ Joules.

Calorie is commonly used to measure energy in food and metabolic processes.

Explanation

Diffusion is the process by which gas molecules move from an area of higher concentration (kitchen) to lower concentration (other rooms).

This random molecular motion spreads the smell of cooking throughout the house.

Explanation

Charles’s law states that at constant pressure, the volume of a gas is directly proportional to its absolute temperature.

Boyle’s law relates pressure and volume.

Avogadro’s law relates volume and moles.

Dalton’s law deals with partial pressures.

Explanation

Volume of a cylinder  

- Formula: V = πr²h  

- Where r = radius, h = height.  

- Volume measures the capacity inside the cylinder.