Explanation

• Albert Einstein received the Nobel Prize for his discovery of the Law of the photoelectric effect
• The 1921 prize was actually awarded in 1922.

Explanation

• The telescope was first used for astronomical observations in the early 17th century.
• Galileo Galilei first used an improved telescope in 1609 to observe planets like Jupiter, Saturn, and Venus.
• He discovered four large moons of Jupiter (Io, Europa, Ganymede, and Callisto).

Last verified on 11-03-2026

Explanation

• A Telescope is an optical instrument used to observe distant objects such as stars, planets, and galaxies.
• It collects and magnifies light or other forms of electromagnetic radiation.
• The term “telescope” was coined in 1611 by the Greek mathematician Giovanni Demisiani.

Last verified on 10-03-2026

Explanation

• The atmospheric pressure at any place is measured by a Barometer.
• The barometer was invented by Evangelista in 1644.

Last verified on 10-03-2026

Explanation

• First man who travelled in Space was Yuri Gagarin in 1961.
• Yuri Gagarin was a Soviet pilot and cosmonaut.
• He aboard the first successful crewed spaceflight, became the first human to journey into outer space.

Additional information:

• First man who Walk in Space was Alexei Leonov in 1965.
• First man who Walk on Moon was Neil Armstrong in 1969.

Last verified on 10-03-2026