Explanation

• The ovum (egg cell) is generally considered the largest cell in the human body.
• It is the female reproductive cell and can be seen with the naked eye as a tiny dot.
• The ovum is approximately 0.1 mm (100 micrometers) in diameter.
• In contrast, the sperm cell is one of the smallest human cells.

Last verified on 03-09-2026

Explanation

• Greenland is the world’s largest island.
• It is located between the Arctic and Atlantic Oceans.
• It belongs to the Kingdom of Denmark.
• Population is about 56,000 people only.
• Area: 2.131 million km²
• Maximum width: 1,050 km
• Location: North America region (Arctic area)
• Capital: Nuuk

Last verified on 06-06-2026

Explanation

• On 9 June, 2017 India and Pakistan became full members of the SCO.
• Full Form: Shanghai Cooperation Organisation (SCO)
• Founded: 15 June 2001
• Headquarters: Beijing, China
• Founder Members (2001): China, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan
• Purpose: Regional security, economic cooperation, counter-terrorism, and cultural cooperation

Additional information:

Current SCO Member States (10):

1. China
2. Russia
3. Kazakhstan
4. Kyrgyzstan
5. Tajikistan
6. Uzbekistan
7. India (Joined: 9 June 2017)
8. Pakistan (Joined: 9 June 2017)
9. Iran (Joined: 4 July 2023)
10. Belarus (Joined: 4 July 2024)

Last verified on 26-07-2026

Explanation

• 1 Nanometer (nm) = 10⁻⁹ m

Additional information:

• 1 Kilometer (km) = 10³ m
• 1 Meter (m) = 10⁰ m
• 1 Millimeter (mm) = 10⁻³ m
• 1 Micrometer (µm) = 10⁻⁶ m

Last verified on 06-07-2026

Explanation

• The Andes Mountain Range is the longest continental mountain range in the world.
• It stretches along the western edge of South America.
• Its total length is about 8,900 km (5,500 miles).
• Highest peak of Andes: Aconcagua (6,961 m)

Additional information:

• Sutter Buttes is considered the smallest mountain range in the world.
• Location: California, USA
• It is also called the “World’s Smallest Mountain Range”.
• Highest mountain in world: Mount Everest (8,848.86 m)
• Second highest peak: K2 (8,611 m)
• Himalayas length: about 2,400 km

Last verified on 17-05-2026

Explanation

• Diamond is a naturally occurring allotropic form of carbon.
• Allotropy means a single element can exist in more than one form with different structures and properties.
• It is extremely hard.
• It has a high melting point.
• It is widely used in jewelry and cutting tools.

Additional information:

• Graphite – soft, good conductor
• Fullerenes (C60) – spherical molecules
• Carbon nanotubes – tubular, high strength
• Amorphous carbon – coal, soot
• Lonsdaleite – hexagonal diamond

Last verified on 17-01-2026

Explanation

• Sea water contains a high amount of dissolved salts.
• Because of salinity, its freezing point is lower than fresh water.
• Fresh water freezes at 0°C, but saltwater freezes at a lower temperature.

Last verified on 01-06-2026

Explanation

• Meteorology is the scientific study of the atmosphere, especially weather and climate.
• It involves forecasting and understanding atmospheric phenomena.
• Meteorology is a branch of the atmospheric sciences.
• Metrology is the scientific study of measurement.

Last verified on 03-04-2026

Explanation

• Vitamin D is essential for healthy bones.
• Its deficiency leads to Rickets in children and Osteomalacia in adults.
• Sunlight is the best natural source of Vitamin D.

Additional information:

Deficiency effects:

• Bone pain
• Weak bones
• Skeletal deformities

Other Vitamin Deficiencies:

• Vitamin A: Night blindness
• Vitamin C: Scurvy
• Vitamin B7 (Biotin): Hair fall

Last verified on 17-01-2026

Explanation

Radioactivity was discovered by Henri Becquerel in 1896.

They discovered radioactivity proving that the uranium emitted radiation without an external source of energy such as the Sun

Marie Curie with her husband Pierre Curie, coined the term radioactivity.

In 1903, Henry Becquerel shared the Nobel Prize for Physics with Pierre and Marie Curie

Ernest Rutherford did many experiments studying the properties of radioactive decay (alpha, beta, and gamma)