Explanation

To convert the decimal number 139 to binary:

139 ÷ 2 = 69 remainder 1

69 ÷ 2 = 34 remainder 1

34 ÷ 2 = 17 remainder 0

17 ÷ 2 = 8 remainder 1

8 ÷ 2 = 4 remainder 0

4 ÷ 2 = 2 remainder 0

2 ÷ 2 = 1 remainder 0

1 ÷ 2 = 0 remainder 1

Reading the remainders from bottom to top:

10001011

Explanation

The Faraizi Movement (founded by Haji Shariatullah) emphasized reviving Islamic obligations (Faraiz).

It was not focused on modernization but on purifying Muslim society from un-Islamic practices.

Explanation

Pakistan has a federal parliamentary system, where powers are shared between the federal government and provinces.

The Prime Minister is the head of government, elected by the National Assembly.

Explanation

Frequency of sound refers to the number of vibrations per second.

It is measured in Hertz (Hz) — 1 Hz = 1 vibration per second.

Explanation

"Oldest" is the superlative degree of the adjective "old".

Superlative form shows the highest degree among three or more things.

Explanation

Yourself is a reflexive pronoun used when the subject (you) and the object are the same.

It emphasizes that you should do the work without help.

Explanation

"Ours" is the possessive pronoun showing ownership of the room.

It refers to "our room" without repeating the noun.

Explanation

Mandela led the struggle against racial segregation (apartheid) in South Africa.

He became the country's first Black president in 1994.

Explanation

Explorer and Firefox are web browsers used to access the internet.

Such programs are categorized as application software, designed for specific user tasks.

Explanation

The sum of two whole numbers is always a whole number — this is called closure property of addition.

Whole numbers include 0 and all positive integers (0, 1, 2, 3, ...).