Explanation

 Ice blocks are covered with sawdust primarily to provide necessary insulation from heat, preventing them from melting quickly. 

Explanation

The International Space Station (ISS) orbits Earth at an average altitude of around 400 kilometers.

This low Earth orbit allows it to circle the Earth roughly every 90 minutes.

Explanation

Electromagnetic waves are transverse waves, meaning the oscillations of electric and magnetic fields are perpendicular to the direction of wave propagation.

Unlike mechanical waves, they do not need a medium and can travel through a vacuum.

Explanation

A diode allows current to flow in only one direction — from anode (positive) to cathode (negative).

It acts as a one-way valve for electric current, conducting only when forward-biased (positive to anode, negative to cathode).

Explanation

Explanation

The prefix "Tera" refers to 10^12.

It is commonly used to represent a trillion in the metric system (1,000,000,000,000).

Explanation

Explanation

A thermos flask is used to maintain the temperature of liquids, keeping hot things hot and cold things cold for extended periods.

It achieves this by minimizing heat transfer through a combination of insulation and a vacuum. 

Explanation

Energy and work have the same dimensional formula, $$[ML2T−2][ML^2T^{-2}]

Both represent the ability to perform work or cause a change in energy.

Explanation

The demographic transition model was initially proposed in 1929 by demographer Warren Thompson.