Explanation

Alfred Nobel was a chemist from Sweden. 

Dynamite was invented by Alfred Nobel in the 1860s.

He is also the founder of the Nobel Prize

He also invented Nitro-glycerine in 1875.

Alfred Nobel  Born: October 21, 1833, Stockholm, Sweden

Alfred Nobel  Died: on December 10, 1896, in Sanremo, Italy

Alfred Nobel Full name: Alfred Bernhard Nobel

Additional Information

The first Noble Prize was awarded on 10th December 1901

The first Noble Prize was awarded in Stockholm, Sweden.

Explanation

The Wright Brothers, Orville and Wilbur, invented and flew the first successful airplane.

This historic flight took place on December 17, 1903, in Kitty Hawk, North Carolina.

Explanation

• Carbon dioxide (CO2) is a major greenhouse gas.
• It responsible for about 65% of the Earth's greenhouse effect.

Explanation

Opaque objects form sharp and dark shadows because they block all light from passing through, creating a clear and defined shadow.

Explanation

Melting of ice changes only the state from solid to liquid.

No new substance is formed, so it's a physical and reversible change.

Explanation

Temporary hardness of water is caused by dissolved bicarbonates of calcium and magnesium.

It can be removed by boiling, which decomposes Ca(HCO₃)₂ into insoluble carbonate.

Explanation

Plaster of Paris changes into gypsum on mixing with water 

It is commonly called P.O.P. is calcium sulfate hemihydrate.

The chemical formula of plaster of Paris  is CaSO4.1/2 H2O

Crystals of gypsum are produced when Plaster of Paris is mixed with water 

Gypsum is calcium sulfate dihydrate and a mineral used in cement manufacturing.

It helps in controlling the rate of hardening of the cement. 

Explanation

Ophthalmologist means a specialist in the branch of medicine concerned with the study and treatment of disorders and diseases of the eye.

Ophthalmologist means ماہر امراض چشم

Explanation

Explanation

CNG stands for Compressed Natural Gas

Methane is the main component of CNG 

the modern use of CNG as a fuel source began in the 1930s,

American physicist Dr. J.P. Farley discovered that natural gas could be compressed to a high-pressure 

natural gas became a transport fuel during the First World War