Explanation

• Najibullah is the title of Hazrat Dawood (AS).
• The holy book Zaboor revealed to Hazrat Dawood (AS).
• He is buried in Israel.
• He is called caliph of Allah.
• He is mentioned in the Holy Quran for 16 times.

Last verified on 23-04-2026

Explanation

• Hazrat Saleh invented Soap.
• He was a prophet of the nation Samood.
• He is buried in Lebonan.

Last verified on 23-04-2026

Explanation

• The grave of Hazrat Ibrahim (A.S) is located in the city of Hebron.
• This place is historically known as Al-Khalil.
• It lies in present-day Palestine (West Bank).
• The site is inside the famous Ibrahimi Mosque (Cave of the Patriarchs).

Last verified on 23-04-2026

Explanation

• Fought in 629 AD (8 AH)
• Location: Mu’tah (Jordan)
• Opponents: Muslims vs Byzantine Empire (Romans)
• Commanders martyred: Zaid bin Harithah, Jafar ibn Abi Talib, Abdullah bin Rawaha
• Leadership later taken by Khalid ibn al-Walid

Last verified on 23-04-2026

Explanation

• Washing soda is also known as sodium carbonate (Na2CO3).
• It is used to remove permanent hardness of water.
• Permanent hardness is caused by the presence of magnesium and calcium sulfates or chlorides in water, which cannot be removed by boiling.
• Washing soda helps to precipitate these minerals, making the water softer.

Last verified on 23-04-2026

Explanation

• Sugar is the most soluble chemical in water.
• Sugar is made from sucrose.
• Sugar dissolves readily in water due to its polar nature.
• It forms hydrogen bonds with water molecules, increasing solubility.
• Used widely in food and beverages due to easy dissolution.

Last verified on 23-04-2026

Explanation

• The longest cell in the human body is the nerve cell (neuron).
• Some neurons can extend up to 1 meter in length.
• They transmit impulses throughout the body.

Additional information:

• The smallest cell in the human body is the sperm cell (spermatozoon).
• It is measures approximately 4–5 micrometers (µm) in length.
• It is mainly consisting of a nucleus and a tail.

Last verified on 23-04-2026

Explanation

• Allergy is an abnormal immune response to harmless substances like dust or pollen.
• It occurs when the body reacts excessively to an allergen.
• This reaction involves the immune system producing antibodies.
• Thus, allergy is mainly due to an antigen–antibody reaction.

Last verified on 23-04-2026

Explanation

• A reflex action is a quick, automatic response to a stimulus.
• It is mainly controlled by the spinal cord, which is part of the central nervous system.
• This allows fast response without involving the brain immediately.
• Thus, reflexes are coordinated by the central nervous system.

Last verified on 23-04-2026

Explanation

• The kidney is an important organ responsible for filtering blood and forming urine.
• Its structural and functional unit is the nephron.
• Each kidney contains millions of nephrons.
• They perform filtration, reabsorption, and secretion.

Last verified on 23-04-2026