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

Decibels measure sound intensity (amplitude)

Sound is energy that travels in waves.

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

Explanation

Hayate-e-Javed is written by Altaf Hussain Hali 

In Hayate-e-Javed, he wrote the biography of Sir Syed Ahmad Khan

It was first published in 1902.

Explanation

Direct Action Day, also known as the 1946 Calcutta Killings, was a day of nationwide communal riots by the Indian Muslim community announced by Muhammad Ali Jinnah.

It led to large-scale violence between Muslims and Hindus in the city of Calcutta (now known as Kolkata) in the Bengal province of British.

Explanation

The author of Kitab-ul-Hind is Al-Biruni,

Publisher: Anjuman Taraqqi Urdu (Hind), Delhi.

Year of Publication: 1941.

The language of Al-Biruni's 'Kitab-ul-Hind' is Arabic.

Explanation

The Edhi Foundation is a non-profit social welfare organization based in Pakistan.

It was founded by Abdul Sattar Edhi in 1951.

Headquarters of Edhi Foundation located in Karachi.

Explanation

 King Fahd International Airport, also known as Dammam International Airport 

King Fahad International Airport of Saudi Arabia is the largest airport in the world.

named after the former King of Saudi Arabia, Fahd ibn Abdulaziz. 

Opened: 28 November 1999

Explanation

Government of India Act 1935 adopted as Pakistan's first constitution in 1947.

The Government of India Act was a total failure as it was not able to give what it had proposed.

Act of 1935 consisted of 321 sections

The concept of dyarchy that was brought proved to be wrong and also the act was opposed by the Indian National Congress and the Muslim League.

Explanation

The Provisional Government of the People's Republic of Bangladesh was established on 10 April 1971. 

Pakistan recognized the Government of Bangladesh on Feb 1974.

The Provisional Government of the People's Republic of Bangladesh, popularly known as the Mujibnagar Government

Headed by Prime Minister Tajuddin Ahmad

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Explanation

War and Peace published: in 1869.

Leo Tolstoy was: a Russian writer.