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%

Explanation

• Sound travels fastest in diamond, with a speed of approximately 12,000 meters per second (m/s).
• This is because diamond has a very high stiffness and density, which allows sound waves to propagate quickly through the material.

The speeds of sound in different materials:

• Air: 343 m/s
• Water: 1433 m/s
• Wood: 3300-3600 m/s
• Brick: 4176 m/s
• Steel: 6100 m/s
• Diamond: 12000 m/s

Explanation

The Arab League is a regional organization in the Arab World 

Founded: March 22, 1945

Headquarters located in Cairo, Egypt

Members: 22

Explanation

Hour hand moves 225° (7.5 hours).

Minute hand moves 180° (30 minutes).

Angle between them: 45° (difference) + 30° (hour hand's extra move) = 75°.

OR

= 8h x 30 - 30 x 11/2

= 240 - 165

= 75°

Explanation

UNIX is an operating system that was originally AT&T.

UNIX development started in 1969 at the Bell Labs research center by Ken Thompson and Dennis Ritchie.

UNIX was widely used for Internet servers, workstations, and mainframe computers.

Explanation

Abdur Rehman Chughtai was a renowned Pakistani painter.

He is known for his distinctive Mughal-inspired artistic style.

He is also notable for designing Pakistan's first postage stamp in 1947.

Explanation

Decibels measure sound intensity (amplitude)

Sound is energy that travels in waves.

It can be measured in two ways: frequency and amplitude.

Explanation

In Islamic belief, sovereignty belongs to Allah alone.

Allah is the supreme authority over all creation. 

Human governance must align with divine laws from the Quran and Hadith.

Explanation

"The more dangerously a person lives, the more likely he or she is to die young".

ایک شخص جتنی خطرناک زندگی گزارتا ہے، اس کے جوان مرنے کا امکان اتنا ہی زیادہ ہوتا ہے۔

It means that increased danger in one's lifestyle correlates with a higher likelihood of an early death.

Explanation