Explanation

• Kallar Kahar Lake is situated in Chakwal District, Punjab.
• It is a natural saltwater lake.
• It is also a tehsil (subdivision) of Chakwal District.
• The lake is famous for its scenic beauty and migratory birds.
• It lies on the Lahore–Islamabad Motorway (M-2).

Verified & Updated

Explanation

Last verified on 30-04-2026

Explanation

• “Call it a day” means to stop working for the rest of the day.
• It is used when someone finishes their work or decides to rest.
• Example: We are tired, let’s call it a day.

Last verified on 14-05-2026

Explanation

• The printing press with movable type was invented by Johannes Gutenberg.
• When: Around 1440-1450.
• Where: Mainz, Germany.

Last verified on 13-07-2026

Explanation

• Boiling point of water: 100°C
• Freezing point of water: 0°C
• Standard atmospheric pressure: 1 atm (760 mmHg)
• 0°C = 32°F
• 100°C = 212°F

Last verified on 06-07-2026

Explanation

• Quaid-e-Azam presented his 14 Points in March 1929 in response to the Nehru Report (1928).
• The 14 Points were aimed at safeguarding the political, religious, and constitutional rights of Muslims in British India.
• Muhammad Ali Johar assisted Quaid-e-Azam in preparing the Fourteen Points.

Last verified on 06-07-2026

Explanation

• Holy Prophet Muhammad (ﷺ) passed away on Monday, 8 June 632 CE (12 Rabiʿ al-Awwal, 11 AH).
• He was buried in the room of Hazrat Aisha (RA), which is now part of Al-Masjid an-Nabawi.
• The Prophet (ﷺ) was died at the age of 63 years.

Additional information:

• Birth: 12 Rabiʿ al-Awwal, 571 CE
• Mother (Hazrat Amina RA) passed away: When he was 6 years old
• Grandfather (Abdul Muttalib) passed away: When he was 8 years old
• Migration (Hijrah) to Madinah: 622 CE

Last verified on 03-07-2026

Explanation

• Sound cannot travel through a vacuum because there are no particles to carry sound vibrations.
• Sound needs a medium such as a solid, liquid, or gas to travel.
• Since space is nearly a vacuum, sound cannot be heard there.
• The speed of sound in a vacuum is 0 m/s.

Additional information:

• Infrasound: Below 20 Hz
• Audible sound: 20 Hz – 20,000 Hz (20 kHz)
• Ultrasound: Above 20 kHz
• Speed of sound in air: 343 m/s
• Speed of sound in water: 1,481 m/s

Last verified on 07-06-2026

Explanation

• The 1973 Constitution introduced a Parliamentary system of government with a Bicameral Legislature in Pakistan.
• The Constitution of 1973 is the supreme law of Pakistan.
• It was introduced by Zulfikar Ali Bhutto.
• It came into effect on 14 August 1973.
• The system gave executive authority to the Prime Minister and Parliament.

Last verified on 02-07-2026

Explanation

• WWW stands for World Wide Web.

Additional information:

• It is an information system.
• First published: 6 August 1991
• Founder: Tim Berners-Lee in 1989.
• Birthplace: CERN near Geneva, Switzerland.

Last verified on 01-07-2026