Explanation

• The first process in a petroleum refinery is Distillation.
• It is also known as Fractional Distillation.
• This process separates crude oil into various fractions or types of hydrocarbons, based on their boiling points and molecular weights.

Additional information:

The processes in a petroleum refinery:

1. Cracking
2. Reforming
3. Isomerization
4. Hydrotreating
5. Hydrocracking
6. Catalytic Cracking
7. Alkylation

Last verified on 22-01-2026

Explanation

Flat bones are found in areas like the skull and ribs.

They providing protection and surface for muscle attachment.

They are thin and flattened compared to other bone types.

Explanation

If Earth had no atmosphere, the sky would appear black even during the day,

Hence, the sky would appear black, just like it does from space.

Explanation

"Widow's Tears" is a common name for several plants

Most notably the Spiderwort (genus Tradescantia) and Dayflowers (genus Commelina),

Explanation

Jean-Jacques Rousseau is called the Father of the French Revolution.

Born on June 28, 1712

Died on July 2, 1778, at the age of 66 years.

Explanation

Oxygen was discovered in 1774 by English chemist Joseph Priestley,

He isolated it by heating mercuric oxide and called it "dephlogisticated air".

Oxygen was discovered independently by Carl Wilhelm Scheele (around 1772)

Explanation

 The Stone Age is also known as the Paleolithic Period (Old Stone Age) for its earliest phase

Mesolithic (Middle Stone Age)

Neolithic (New Stone Age)

Chalcolithic Period (or Copper Age)

Explanation

Belief is defined as a state or habit of mind in which trust or confidence is placed in some person or thing.

It involves having a conviction that something is true or reliable. 

Explanation

Decibel (dB) measures the intensity or loudness of sound.

It is a logarithmic unit, meaning each 10 dB increase represents a tenfold increase in intensity.

Decibels are also used in electronics and signal strength measurements.

It does not measure speed of light or heat.

Common examples: Normal conversation ≈ 60 dB, threshold of hearing ≈ 0 dB, jet engine ≈ 120 dB.

Explanation