Explanation

The color of a star is directly related to its temperature.

Hotter stars appear blue or white, while cooler stars appear red.

Explanation

The SI is made up of 7 base units

that define the 22 derived units with special names and symbols, which are illustrated in NIST SP 1247, SI Base Units Relationship Poster. 

Explanation

Lunar Seas, or maria, are large, dark basaltic plains on the Moon's surface.

It formed by ancient volcanic eruptions.

They are not actual seas filled with water.

Explanation

Yardangs and Earth Pillars are geological features formed by erosion.

While Balban is unrelated to erosion as it refers to a historical figure, not a natural feature.

Explanation

Radio waves have the longest wavelength in the electromagnetic spectrum, making them the radiation with the maximum wavelength.

Explanation

• Rotation speed: 15° per hour.
• Rotation: Once every 24 hours.
• Direction: West to East.
• Equator speed: 1,670 km/h.
• Revolution around Sun: 365.24 days.
• Rotation causes day and night.

Explanation

The formula for Intelligence Quotient (IQ) is:

$$text{IQ} = frac{text{Mental Age (MA)}}{text{Chronological Age (CA)}} times 100$$

Explanation

Submarines operate based on Archimedes' principle.

It allows them to control buoyancy and submerge or surface by adjusting their density relative to the surrounding water.

Explanation

Explanation

An optical fiber is a flexible,

transparent fiber made by drawing glass  or plastic

To a diameter slightly thicker than that of a human hair.