Explanation

• In August 1947, the population of Sindh was about 5.5 million.
• This was the time of the partition of British India.
• Sindh became one of the provinces of newly formed Pakistan.
• The population included both urban and rural settlements.
• Karachi was already an important city even at that time.

Last verified on 01-06-2026

Explanation

• Author: Stephen Hawking
• Book Title: A Brief History of Time
• Main Topic: Universe (origin, structure, evolution, and fate)
• First Published: 1988
• Publisher: Bantam Dell Publishing Group
• Copies Sold: ~10 million
• Languages: 40 languages

Last verified on 01-06-2026

Explanation

• Nicolaus Copernicus is called the Father of Modern Astronomy.
• He introduced the heliocentric theory in 1543.
• This theory stated that the Sun is at the center of the solar system.
• His ideas changed the old belief that Earth is the center.

Additional information:

• Galileo Galilei, a later figure, is often called the "father of observational astronomy".

Last verified on 01-06-2026

Explanation

• The Earth’s circumference at the equator is about 40,075 km (24,901 miles).
• Measured through the poles, it is slightly smaller: 40,008 km (24,860 miles).
• The difference is due to the equatorial bulge caused by Earth's rotation.
• Diameter: ~12,756 km (7,926 miles).
• Age of Earth: ~4.453 billion years.

Last verified on 31-03-2026

Explanation

• The next leap year after recent cycle is 2028.
• A leap year comes after every 4 years.
• A year divisible by 4 is usually a leap.
• It has 366 days instead of 365 days.
• The extra day is added in February (29th February).

Last verified on 01-06-2026

Explanation

• Aga Khan III was the first president of the All-India Muslim League, founded in 1906.
• He led the Muslim deputation to the British Viceroy the same year to represent Muslim interests.
• Born: 2 November 1877, Karachi
• Died: 11 July 1957, Versoix, Switzerland
• Burial: Aga Khan Mausoleum, Egypt

Founders of All-India Muslim League:

1. Muhammad Ali Jinnah
2. Aga Khan III
3. Khwaja Salimullah
4. Hakim Ajmal Khan

Last verified on 16-03-2026

Explanation

• Wheat is the major and staple crop of Pakistan.
• It is the most widely grown food grain in the country.
• Wheat is mainly grown in Punjab and Sindh provinces.
• It is used to make flour (atta), a basic food in Pakistan.
• Wheat season: Rabi crop (winter season).

Last verified on 01-06-2026

Explanation

• Bahadur Shah Zafar is the last Mughal emperor of India (reigned 1837–57).
• He was a poet, musician, and calligrapher, more an aesthete than a political leader.
• He was born October 24, 1775, in Delhi, India.
• He died November 7, 1862, in Rangoon [now Yangon], Myanmar.

Last verified on 01-06-2026

Explanation

• Penicillin, the first true antibiotic, was discovered by Alexander Fleming.
• He made this discovery in 1928 at St. Mary’s Hospital, London.
• He found that a mould (Penicillium) killed bacteria in culture dishes.
• His findings were officially published in 1929.
• First patient treated: Albert Alexander (12 February 1941)

Last verified on 01-06-2026

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