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Explanation

• Water (H₂O) and carbon dioxide (CO₂) combine to form carbonic acid (H₂CO₃).
• The reaction is: CO₂ + H₂O ⇌ H₂CO₃.
• Carbonic acid is a weak acid.
• It forms naturally when CO₂ dissolves in water.
• Carbonic acid contributes to the slightly acidic nature of rainwater.

Last verified on 11-08-2026

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

Explanation

• Bahadur Shah Zafar was exiled to Rangoon, Burma, after his defeat, where he died.
• Full name: Abu Zafar Siraj-ud-din Muhammad Bahadur Shah Zafar.
• Reign: 1837–1857.
• Exile: Sent to Rangoon, Burma, in 1858.
• Death: 7 November 1862, in Rangoon.
• He was also a renowned poet, musician, and calligrapher.

Last verified on 11-08-2026

Explanation

The three principal Axis Powers in World War II were Germany, Italy, and Japan.

1. Germany — led by Adolf Hitler; dominant power in continental Europe.
2. Italy — led by Benito Mussolini; sought dominance in the Mediterranean.
3. Japan — led by its imperial government; expanded across East Asia and the Pacific.

The Tripartite Pact formally linked Germany, Italy, and Japan in 1940.

• They fought against the Allied Powers, including Britain, France, the Soviet Union, China, and later the United States.

Last verified on 11-08-2026

Explanation

• Territory: Greenland.
• Exercise: Arctic Endurance.
• Started: January 2026.
• Led by: Denmark.
• Purpose: Strengthen security and NATO's ability to operate in the Arctic.

Last verified on 11-08-2026

Explanation

• The pitch of a sound wave depends on its frequency.
• Pitch tells us whether a sound is high or low.
• Higher frequency → higher pitch (e.g., whistle).
• Lower frequency → lower pitch (e.g., bass drum).
• Frequency is measured in Hertz (Hz).

Last verified on 11-08-2026

Explanation

• The law of universal gravitation was proposed by Isaac Newton.
• He introduced it in 1687 in his famous book Principia.
• It explains that every object attracts every other object.
• The force depends on mass and distance.

Last verified on 27-04-2026

Explanation

• The CPU (Central Processing Unit) is the brain/heart of the computer.
• It processes data and executes instructions.
• It controls other parts of the system.

Additional information:

• First commercial CPU: Intel 4004 (1971)
• Invented by: Italian physicist Federico Faggin
• CPU Examples: Clock speeds – 3.0 GHz, 3.5 GHz, 4.0 GHz, 4.5 GHz, 5.0 GHz

Last updated by NA on 09-09-2026

Explanation

• Date: 3 June 1947
• Announced by: Lord Louis Mountbatten
• Position: Last Viceroy of British India
• Purpose: Partition of British India
• Outcome: Creation of India and Pakistan

Last verified on 16-05-2026

Explanation

• Imperceptible means too small or subtle to be noticed.
• Noticeable means easy to see, hear, or recognize.
• Imperceptible means بہت چھوٹا یا لطیف
• Noticeable means دیکھنے، سننے یا پہچاننے میں آسان

Last verified on 11-08-2026