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

• Symbol: Hg
• Atomic number: 80
• Melting point: -38.83 °C
• Atomic mass: 200.59 u

Last verified on 13-03-2026

Explanation

World Bicycle Day is marked on 3rd June every year to recognize bicycling as a way to get a sustainable form of travel.

In April 2018, the United Nations General Assembly declared June 3 as World Bicycle Day

Theme 2026: Cycling for a Greener Future

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Explanation

• NACTA was created in 2009 to coordinate counter-terrorism efforts in Pakistan.
• NACTA stands for National Counter Terrorism Authority.
• Legal Act: NACTA Act 2013
• Headquarters: Islamabad, Pakistan
• Function: Policy-making against terrorism & extremism
• Its initial setup started in January 2008.
• It works under the Ministry of Interior.

Last verified on 11-06-2026

Explanation

• The current Secretary-General of the United Nations is António Guterres from Portugal.
• He began his first term on January 1, 2017.
• He is currently serving his second term.

Last verified on 10-05-2026

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

Anura Kumara Dissanayake is the current & tenth President of Sri Lanka since 23 Sep 2024.

Predecessor: Ranil Wickremesinghe

Party affiliation: Janatha Vimukthi Peramuna

Updated on 23-03-2026

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Explanation

• COVID-19 was declared pandemic by WHO on March 11, 2020. 
• WHO stands for: World Health Organization
• COVID caused by: SARS-CoV-2
• COVID-19 acronym: Coronavirus disease 2019
• Global Pandemic means: عالمی وباء

Last verified on 16-03-2026

Explanation

World Braille Day is an international day on 4 January 

The first World Braille Day was celebrated on January 4, 2019

The day recognizes the contributions of Louis Braille in helping blind and visually impaired people to read and write.

Explanation

Jaffar Khan Mandokhail is the current and 24 Governer of Balochistan

Party name: PML-N

Governor Balochistan since: 04 May 2024

Predecessor: Abdul Wali Kakar 

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Last Verified and Updated on 11-01-2026

ان سوالات کو ضرور پڑھیں

·        Current Governor KPK

·         Current Governor of Sindh

·        Current Governor of Punjab

·        Current Governor of Balochistan