Explanation

• The relative pronoun is who.
• A relative pronoun is a word that is used to connect an independent clause to a dependent clause.
  
• The most common relative pronouns are: Who, whom, whose, which, that etc.

Last verified on 13-10-2026

Explanation

• Date: July 16, 1990
• Satellite Name: Badr-1 (also known as Badr-A)
• Agency: Developed by SUPARCO 
• Launch Vehicle: Chinese Long March 2E rocket.
• End of mission
• Last contact: 21 August 1990
• Decay date: 9 December 1990

Last updated 07-09-2026 by NA

Explanation

• Saturn is famous for its prominent and beautiful ring system.
• Its rings are made mainly of ice particles, dust, and rock fragments.

Additional information:

• It is the second-largest planet in the Solar System.
• It is often called the “Ringed Planet.”
• Famous moon: Titan
• Orbital period: About 29.5 Earth years
• It is the sixth planet from the Sun.

Last verified on 27-09-2026

Explanation

• 22 April is celebrated as  World Earth Day
• The event first began in the United States on April 22, 1970
• Theme 2026: Our Power, Our Planet 
• Next time: April 22, 2027

Additional information 

• World Environment Day is on 5 June.
• Earth Overshoot Day is observed on August 22

Last updated 17 july 2026 by NA

Explanation

• 24-karat (24K) gold is considered the "best"
• Purity: 99.9% pure gold.
• Color: Rich, deep, bright yellow.

Additional information

• 22K Gold: 91.7% pure gold. It is mixed with harder metals like silver or copper.
• 18K Gold: 75% pure gold. It is highly durable and excellent for diamond settings 
• Carat is the unit of measurement for the physical weight of diamonds/gold.

Last updated by NA on 16-07-2026

Explanation

• Headquarters: Jeddah, Saudi Arabia
• OIC stands for Organization of Islamic Cooperation.
• Foundation Date: 25 September 1969
• Official Languages: Arabic, English, French
• Total Members: 57 countries
• First Summit: Rabat, Morocco
• Significance: Largest international organization after the UN.

Last verified on 10-05-2026

Explanation

• Facsimile means فیکس
• Original means اصل

Last verified on 01-04-2026

Explanation

Explanation

Explanation

On March 7, 1876, Graham Bell invent the telephone.

Graham Bell made the first-ever telephone call to his partner, Thomas Watson.

while

In 1880 the first phone book was published

Alexander Graham Bell demonstrated the telephone to Queen Victoria in 1878

ND16-8-2023