Explanation

• Atoms of the same element with different numbers of neutrons are called isotopes.
• Atoms of the same element have the same number of protons and electrons but different numbers of neutrons.

Last verified on 09-11-2026

Explanation

• The instrument used to measure temperature is called a thermometer.
• A thermometer shows how hot or cold an object or place is.

Additional information:

• Barometer measures air pressure.
• Hygrometer measures humidity (moisture in air).

Last verified on 16-06-2026

Explanation

• White blood cells (leukocytes) are part of the immune system.
• They play a key role in defending the body against infections, diseases, and foreign invaders.
• They help maintain overall health.

Last verified on 09-11-2026

Explanation

• Chlorine is commonly used to disinfect drinking water.
• It kills harmful bacteria and many other microorganisms.
• This process is called chlorination.

Last updated 08 Nov 2026 by NA

Explanation

• The Holy Prophet  was 6 years old when his mother died
• Mother: Hazrat Aminah bint Wahb (RA).
• Mother's tribe: Quraysh; clan of Banu Zuhrah.
• Mother's burial place: Abwa.

Additional information:

• Father: Hazrat Abdullah (RA) — died approximately six months before his birth.
• Grandfather: Abdul Muttalib (RA).
• Grandfather's death: When Prophet Muhammad ﷺ was 8 years old.

Last updated 08 Nov 2026 by NA

Explanation

• Sahihayn (صحیحین): Meaning: The Two Sahih Books (دو صحیح کتابیں)
• - Sahih al-Bukhari: Compiled by Imam Muhammad al-Bukhari (RA), 
• - Sahih Muslim: Compiled by Imam Muslim ibn al-Hajjaj (RA)
• - Status: The two most authoritative Hadith collections in Sunni Islam.

Last updated 08 Nov 2026 by NA

Explanation

• Ijma Literally, 'consensus' or 'agreement'.
• It is regarded as a binding, infallible authority in Sunni jurisprudence.

1. Ijma al-ummah - a whole community consensus.
2. Ijma al-aimmah - a consensus by religious authorities.

Last updated 08 Nov 2026 by NA

Explanation

• Boot (short for bootstrap) means to start/restart a computer
• It loads the operating system into memory when the computer is turned on
• Types: Cold boot (turning on from off state), Warm boot (restarting)
• Not used for exiting software, starting a program, or shutting down

Explanation

Earth's Rotation 

• - Sidereal Day: Approximately 23 hours, 56 minutes, 4 seconds.
• - Meaning: The time Earth takes to rotate once relative to distant stars.
• - Solar Day: Approximately 24 hours, measured from one noon to the next.
• - Difference: About 4 minutes.

Last updated 08 Nov 2026 by NA

Explanation

• The poles experience six months of the day and six months of the night.
• This is since earth is tilted on its axis.
• Also, due to this, each pole is tilted towards and away from the sun for about six months.
• When the North Pole is tilted towards the sun, it has continuous daylight.

Last updated 08 Nov 2026 by NA