Explanation

• CTBT stands for Comprehensive Nuclear-Test-Ban Treaty.
• It's a multilateral treaty to ban nuclear weapons test explosions for both civilian and military purposes
• Signed: 24 September 1996
• Its headquarters in Vienna, Austria.

Languages (6):

1. Arabic
2. Chinese
3. English
4. French
5. Russian
6. Spanish

The three countries that have not signed the CTBT are:

1. India
2. North Korea
3. Pakistan

These countries are also among the eight Annex 2 states that have not ratified the treaty.

The United States was the first nation to sign the treaty.

• Signatories: 187
• Ratifiers: 178

Last verified on 09-09-2026

Explanation

• China has the world's biggest army by active military personnel.

Additional information:

Top Militaries by Active Personnel (2025 estimates): 

1. China: ~2.035 million
2. India: ~1.46 - 1.475 million
3. United States: ~1.3 - 1.4 million
4. North Korea: ~1.28 million
5. Russia: ~1.1 - 1.3 million

Explanation

• The River Thames flows through southern England.
• It passes through the city of London.
• It is also sometimes called the River Isis in its upper course.
• It is the second-longest river in the United Kingdom.

Additional information:

Major Rivers in the UK:

• River Severn – longest (~354 km)
• River Thames – ~346 km
• River Trent
• River Mersey
• River Clyde

Last verified on 03-05-2026

Explanation

• The first ISS module was launched in 1998
• Module Name: Zarya (meaning "sunrise" in Russian).
• Launched on November 20, 1998
• Launch Vehicle: Russian Proton rocket.
• Launch Site: Baikonur Cosmodrome in Kazakhstan.
• Built by a partnership of 15 nations, including NASA (the United States)

Explanation

• The Indian Ocean covers approximately 70.56 million square kilometers (27.2 million square miles).
• It is the third-largest ocean in the world.
• It lies between Africa, Asia, Australia, and the Southern Ocean.

Additional information:

• Largest ocean: Pacific Ocean
• Second largest: Atlantic Ocean

Last verified on 07-09-2026