Explanation

• The CPU (Central Processing Unit) is the brain/heart of the computer.
• It performs all calculations, executes instructions, and controls other components.

Additional information:

• First commercial CPU: Intel 4004 (1971)
• Invented by: Italian physicist Federico Faggin
• CPU Examples: Clock speeds – 3.0 GHz, 3.5 GHz, 4.0 GHz, 4.5 GHz, 5.0 GHz

Last verified on 15-02-2026

Explanation

• The phrase "Out of the blue" means Unexpectedly/Suddenly.
• It refers to something happening without warning or surprise, like a sudden event or occurrence.

Last verified on 06-08-2026

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

Explanation

• According to Islamic belief, the first structure of the Kaaba was built by Hazrat Adam (A.S).
• Later, it was rebuilt by Hazrat Ibrahim (A.S) and his son Hazrat Ismail (A.S).
• The Kaaba is located in Makkah.
• It is the holiest site in Islam.
• It is the direction (Qibla) for Muslim prayers.

Last verified on 25-04-2026

Explanation

• Simla Agreement was signed on 2 July 1972.
• It took place in Shimla, India.
• Signed between Zulfikar Ali Bhutto and Indira Gandhi.
• It aimed to resolve issues after the 1971 war.
• Both countries agreed to settle disputes through bilateral talks.

Last verified on 29-04-2026

Explanation

• The phrase “went on ___ one point only” means repeatedly focusing on that point.
• “Stressing” fits because it means emphasizing a single idea continuously.

Last verified on 20-06-2026

Explanation

• In “either…or”, the verb agrees with the nearest subject (here: dog = singular).
• Since “dog” is singular, we use “was.”
• So, the correct subject-verb agreement is singular verb “was” with singular nearest subject.

Last verified on 20-06-2026

Explanation

• Pakistan became an "Islamic Republic" in its 1956 constitution.
• This constitution was the first to declare Pakistan as an Islamic Republic.
• It is reflecting the country's identity as a democratic state founded on the principles of Islam.

Additional information:

• The constitution was adopted on March 23, 1956.
• The 1956 Constitution was abrogated in 1958.
• When President Iskander Mirza imposed martial law and declared himself the Chief Martial Law Administrator.

Last verified on 23-03-2026

Explanation

The kidney is the primary organ responsible for filtering blood in the human body.

Each kidney contains approximately one million microscopic units called nephrons

They actively remove metabolic wastes (such as urea and creatinine)