Explanation

• The usual gases used for lifting airships are hydrogen and helium.
• Hydrogen is the lightest known gas and thus has great lifting capacity,
• Helium is not as buoyant but is far safer than hydrogen because it does not burn.

Last verified on 01-04-2026

Explanation

• Masoud Pezeshkian is the current president of Iran since 28 July 2024.
• He won Iranian presidential elections by securing 53.7 % votes.
• Successor: Ebrahim Raisi (perished in Helicopter crash in May 2024)

Last updated by NS on 06 May 2026

Explanation

• The Treaty of Versailles was a peace treaty signed on 28 June 1919.
• Exactly five years after the assassination of Archduke Franz Ferdinand
• Ended  World War I Between Germany and the Allied Powers.
• Location: Hall of Mirrors in the Palace of Versailles, France
• Effective: 10 January 1920
• Languages: French and English

Last updated by NA on 27 April 2026

Explanation

Sanae Takaichi is the current prime minister of Japan since 2026.

She is the first woman PM of Japan. 

She won general elections of 2026.

She belongs to Liberal Democratic Party of Japan (LDP).

She replaced Shigeru Ishiba.

Updated on 22/03/2026

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Explanation

• Hussein Ibrahim Taha was elected as Secretary-General of OIC for a five-year term starting 17 November 2021.
• He belongs to the Republic of Chad.
• 
  

Last verified on 18-03-2026

Explanation

South Asian Association for Regional Cooperation (SAARC)

• Member Countries (8): Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, Sri Lanka
• Founded: 8 December 1985
• Headquarters: Kathmandu, Nepal
• Official Language: English
• Purpose: Promote regional cooperation, economic growth, and cultural exchange among South Asian nations

Last verified on 15-01-2026

Explanation

Herodotus is called the Father of History.

Additional information:

• Born: 484 BC, Halicarnassus (modern-day Bodrum, Turkey)
• Died: 425 BC, Thurii, Italy
• Famous Work: Histories – detailed accounts of Greco-Persian Wars
• Contribution: First to collect, verify, and narrate historical events systematically

Last verified on 18-01-2026

Explanation

The penetration power of the X-rays depends  on the wavelength and frequency of X-rays

The penetration power of the X-rays will be more when the energy of the X-ray is more.

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Related Question:

Explanation

The Treaty of Versailles was the primary treaty produced by the Paris Peace Conference at the end of World War I

The Treaty of Versailles was signed on 28 June 1919

The Treaty of Versailles signed between Allied forces vs Germany

the purpose behind the Treaty of Versailles: Codifying terms between the victorious Allies and Germany after the first world war

ND2-08-2023

Explanation

Wilhelm Conrad Rontgen discovered X-rays

He was discovered on 8 November 1895.

He got the Nobel Prize in Physics in 1901.

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Additional questions

The penetrating power of X-rays depends on their frequency