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

• Sayee is the act of walking or running seven times between the hills of Safa and Marwa in Makkah.
• It is a required ritual in Hajj and Umrah.

Additional information:

• Location: Masjid al-Haram, Makkah
• Performed after: Tawaf (circumambulation of Kaaba)
• Next ritual after Sayee: Hujjaj go to Mina
• Symbolism: Hajar’s search for water for her son, Prophet Ismael (PBUH)

Last verified on 15-03-2026

Explanation

• The number of spark plugs needed in a diesel engine is zero
• Diesel engines use compression ignition instead of a spark.
• Air is compressed until it is hot enough to ignite the fuel.
• Instead of spark plugs, they use glow plugs to warm the engine when cold

Explanation

Explanation

• The Battle of Badr is the first battle of Islam
• On 17 Ramadan, 2 AH (March 13, 624 CE)
• "Badr" means "full moon" in Arabic.
• Also called Furqan and The Day of the Criterion.
• Took place in the valley of Badr, located in the Hejazi region
• Muslims: Approx. 313 men (82 Muhajirun and 231 Ansar).
• Quraysh: Approx. 1000 soldiers led by Abu Jahl.
• 82-85 Muhajirun and 231 Ansar (61 from Aws and 170 from Khazraj).
• 2 horses and 70 camels.
• Fourteen Muslims were killed, while 70 Kufar were killed and 70 captured.

Last updated question by NA 22-April-2026

Explanation

• Nitrogen (N₂) → 78%

Additional information:

• Oxygen (O₂) → 21%
• Argon (Ar) → 0.93%
• Carbon dioxide (CO₂) → 0.04% (approximately)
• Other gases → Trace amounts

Last verified on 28-06-2026

Explanation

• A Barometer is an instrument used to measure air (atmospheric) pressure.
• It helps in weather forecasting by measuring changes in atmospheric pressure.
• The mercury barometer is the oldest type of barometer.
• It was invented by Evangelista Torricelli in 1643.
• Barometers are widely used in meteorology and aviation.

Last verified on 09-07-2026

Explanation

• Hazrat Khalid bin Waleed (R.A) was given the title “Saifullah” (Sword of Allah).
• Given by: Holy Prophet Muhammad (PBUH)
• Born: 592 AD (Makkah)
• Died: 642 AD (Homs, Syria)
• Served under: Prophet Muhammad (PBUH), Abu Bakr (R.A), Umar (R.A)

Last verified on 10-06-2026

Explanation

• Full name: Rashtriya Swayamsevak Sangh.
• Founded: 27 September 1925.
• Founder: Keshav Baliram Hedgewar.
• Headquarters: Nagpur, Maharashtra, India.
• Main purpose: Promotes Hindu cultural identity and organization in Indian society.

Last verified on 15-10-2026

Explanation

• Current Position: 72nd U.S. Secretary of State
• Assumed Office: 21 January 2025
• President: Donald Trump
• Preceded by: Antony Blinken
• Nationality: American
• 
  

Last verified on 15-07-2026

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