Explanation

Explanation

• Carbon dioxide (CO₂) is used in fire extinguishers.
• It extinguishes fire by displacing oxygen and cooling the burning material.
• CO₂ fire extinguishers are especially effective for electrical and flammable liquid fires.
• Carbon dioxide is a colorless and non-flammable gas.
• It leaves no residue after use.

Explanation

Given:

Increment in number = 20% of the number

Decrement in number = 20% of the new number

Concept used:

Net increase or decrease percent = {(Original number or Final number) - (Final number or original number) ÷ Original number} × 100

Calculation:

Let the original number be 100

When the number is increased by 20%

New Number = 100 + 20% of 100

⇒ 100 + 20

⇒ 120

Now, the number is decreased by 20%

Final number = New number – 20% of new number

⇒ 120 – 20% of 120

⇒ 120 – 24

⇒ 96

∴ Net Decrease in percentage = { (100 – 96) / 100} × 100

⇒ {4/100} × 100

⇒ 4%

∴ The net decrease percentage is 4%.

Last verified on 11-07-2026

Explanation

• Insulin is produced by the pancreas.
• The pancreas contains clusters of cells called the Islets of Langerhans.
• Beta (β) cells within these islets produce and secrete insulin.
• Insulin helps regulate blood glucose (sugar) levels by promoting glucose uptake into cells.

Last verified on 07-09-2026

Explanation

• The Nisab (minimum limit) for gold is 7.5 tola (87.48 grams).
• The ratio/nisab of Zakat is 2.5%.
• Zakat was made obligatory in 2 A.H.
• It was fully implemented in 9 A.H.

Additional information:

• Silver Nisab: 52.5 tola = 612.36 grams
• The word “Zakat” occurs 32 times in the Holy Quran.
• Zakat means purification and growth of wealth.
• “Zakat is the treasure of Islam” is a famous saying of the Holy Prophet (PBUH).

Last verified on 11-05-2026

Explanation

• A firewall’s main function is to prevent or block unauthorized access to a computer network.
• It acts as a security barrier between trusted and untrusted networks (like the internet).
• It filters incoming and outgoing network traffic based on security rules.
• It helps protect systems from hackers and unwanted access attempts.

Last verified on 10-06-2026

Explanation

• Surah Al-Baqarah is the longest chapter (surah) in the Holy Quran
• Chapter Number: 2nd chapter in the Quran.
• Meaning: "The Cow" or "The Heifer".
• Verse Count: 286 verses (ayat).
• Length: Spans about 2.5 parts (juz') of the Quran
• .Place of Revelation: Madinah. 
• It derives its name from the story of the cow (vv. 67-73).
• Verse 282, the longest verse, is known as 'āyatu d-dayn.
• It consists of 25,500 letters.
• The chapter has 40 Rukus.

Additional information:

• Surah Al-Kausar is the shortest surah of the Holy Quran.
• Surah Aal-e-Imran is the second-longest surah of the Holy Quran.

Last updated NA on 10-09-2026

Explanation

• Prudent means محتاط
• Imprudent means نادان
• Prudent means acting with care, wisdom, and good judgment to avoid unnecessary risks
• Imprudent means acting without care or thinking about the results of your actions

Last updated question NS on 10-09-2026

Explanation

• VLSI stands for Very Large Scale Integration
• VLSI began in 1970
• It is the process of creating an integrated circuit (IC) by combining thousands, millions, or even billions of transistors onto a single tiny silicon chip

Explanation

• The shortest chapter in the Quran is Surah Al-Kawthar
• Meaning: "The Abundance"
• Number of Verses: 3
• Placement: Chapter 108 in the 30th Juz (Para) of the Quran
• Location of Revelation: Makkah (Makki)

Additional information

• The second shortest surah in the Quran is Surah Al-Asr
• Surah Baqarah is the longest surah of the Holy Quran. (286 Verses). 

Last updated by NS on 5-09-2026