Explanation

• Amylase breaks down starch.
• Starch → Maltose + smaller sugars.
• Found in saliva and pancreatic juice.
• Salivary amylase starts starch digestion in the mouth

Explanation

• O⁻ (O Negative) is the universal donor blood group.
• It can be transfused to A, B, AB, and O blood groups.
• O⁻ blood lacks A, B, and Rh (D) antigens.

Additional information:

• Universal Recipient: AB⁺ (AB Positive)
• ABO Blood Groups: A, B, AB, O
• Rh Types: Positive (+) and Negative (−)
• Total Common Blood Groups: 8 (A⁺, A⁻, B⁺, B⁻, AB⁺, AB⁻, O⁺, O⁻)

Last verified on 14-07-2026

Explanation

• Nicolaus Copernicus proposed the heliocentric model.
• Heliocentric means the Sun is at the center.
• Earth and other planets revolve around the Sun.
• Proposed in the 16th century.
• Ptolemy supported the geocentric model (Earth-centered).

Explanation

• Ice is less dense than water, so it floats.
• Archimedes’ Principle explains the buoyant force acting on floating ice.
• The buoyant force acts upward against gravity.
• Formula: FB = p Vg
• Key point: An object floats when buoyant force = its weight.

Explanation

Bernoulli’s principle is based on conservation of energy in flowing fluids.

P+1/2 ρv2+ρgh=constant

For airplane wings:

• P = Pressure
• ρ (rho) = Density of air
• v = Speed of air
• g = Gravitational acceleration
• h = Height
• Higher air speed → Lower pressure
• Lower air speed → Higher pressure
• Pressure difference between the upper and lower surfaces creates lift.
• Lift acts upward and helps the airplane fly

Explanation

• Earth’s gravity provides the force that keeps satellites in orbit.
• This gravitational force pulls the satellite toward Earth.
• The satellite’s forward motion makes it continuously fall around Earth rather than directly into it.
• Newton’s Law of Gravitation explains this gravitational attraction.

Explanation

• Vivid means روشن
• Bright means روشن
• Clear means صاف

Explanation

• Key Keeper: Hazrat Usman bin Talha (RA)
• Family: Banu Abd al-Dar
• The Prophet (SAW) declared: The key was entrusted to his family permanently.
• This event took place after the Conquest of Makkah (8 AH / 630 AD).

Last updated: 13-09-2026

Explanation

• Khadijah bint Khuwaylid (RA) was the first woman to accept Islam.
• Known for: First wife of Muhammad
• Title: Ameerat-Quraysh al-Tahirah

Additional information:

• First adult man: Khadijah bint Khuwaylid (RA)
• First Child: Ali ibn Abi Talib (RA)
• First Freed Slave: Zayd ibn Harithah (RA)
• First Slave: Bilal ibn Rabah (RA)

Last updated: 13-09-2026

Explanation

• Injeel is the holy book revealed by Allah to Hazrat Isa (A.S).
• Meaning: “Good News”; also called Gospel (means Truth)
• It was revealed in Hebrew.

Additional information:

• Tawrat: Revealed to Hazrat Musa (A.S)
• Zabur: Revealed to Hazrat Dawud (A.S)
• Quran: Revealed to Prophet Muhammad (PBUH)

Last verified on 14-03-2026