Explanation

• O⁻ (O Negative) is the universal donor blood group.
• It can be transfused to A, B, AB, and O blood groups.
• O⁻ blood lacks A, B, and Rh (D) antigens.

Additional information:

• Universal Recipient: AB⁺ (AB Positive)
• ABO Blood Groups: A, B, AB, O
• Rh Types: Positive (+) and Negative (−)
• Total Common Blood Groups: 8 (A⁺, A⁻, B⁺, B⁻, AB⁺, AB⁻, O⁺, O⁻)

Last verified on 14-07-2026

Explanation

• Largest inland water body: Caspian Sea
• Bordering countries: 5 (Russia, Iran, Azerbaijan, Kazakhstan, and Turkmenistan)
• Surface area: ~371,000 km²
• Volume: ~78,200 km³
• Largest river flowing into it: Volga River

Last verified on 07-09-2026

Explanation

• The Durand Line was drawn in 1893.
• It was established as the official border between British India and Afghanistan.
• British representative: Sir Mortimer Durand
• Afghan ruler: Amir Abdur Rahman Khan
• It later became the international border between Pakistan and Afghanistan.
• Length: Around 2,640 km

Last verified on 09-06-2026

Explanation

Pakistan has won the Hockey World Cup 4 times.

1. 1971 – Barcelona, Spain
2. 1978 – Buenos Aires, Argentina
3. 1982 – Mumbai, India
4. 1994 – Sydney, Australia

Last verified on 25-06-2026

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

• Amicus Curiae literally translated from Latin, is "friend of the court."
• It is plural is "amici curiae."
• Generally, it refers to a person or group who is not a party to an action but has a strong interest in the matter.

Last update 0n 21-07-2026 by NA

Explanation

• Hazrat Umar bin Abdul Azeez R.A is known as "Umar-e-Sani" (the second Umar).
• He was the eighth Umayyad caliph.
• He ruled from 717 to 720 CE.
• He was known for justice and piety.
• He followed the principles of Hazrat Umar (RA).

Last update 0n 21-07-2026 by NA

Explanation

• Headquarters: Lyon, France
• Full Name: International Criminal Police Organization (INTERPOL)
• Founded: 1923
• Current Members: 196 countries
• Official Languages: Arabic, English, French, Spanish
• Purpose: International police cooperation and combating cross-border crime.

Last verified on 18-07-2026

Explanation

• Angkor Wat is an ancient city located in Cambodia.
• The largest religious complex in the world.
• During the reign of the Khmer king Suryavarman II as a Hindu temple
• Constructed between 1113 and 1150 CE
• Spread across over 400 acres / 1.6 km²
• Founder: Suryavarman II
• Designated: 1992 (16th session)

Last updated by NA on 16-07-2026

Explanation

• If the ozone layer disappears, harmful ultraviolet (UV) rays will reach the Earth's surface in much larger amounts.
• The ozone layer protects life by absorbing most of the Sun's harmful UV-B and UV-C radiation.
• Increased UV radiation can cause skin cancer, cataracts, and weakened immune systems.
• It can also damage crops, marine life, and ecosystems.
• The ozone layer is found mainly in the stratosphere.

Verified & Updated