Explanation

• The shortcut key for Undo (last action reverse) is Ctrl + Z in most computer systems.
• It is used to cancel the last mistake or action.

Additional information:

• Ctrl + P = Print
• Ctrl + Y = Redo
• Ctrl + S = Save
• Ctrl + C = Copy command
• Ctrl + V = Paste
• Ctrl + C = Copy
• Ctrl + X = Cut
• Ctrl + Y = Redo

Last verified on 10-06-2026

Explanation

• CPU stands for Central Processing Unit.
• It is the main part of a computer that processes all instructions.
• It is considered the brain of the computer system.
• It performs all calculations and decision-making tasks.
• It controls the operations of all hardware and software.
• It is located on the motherboard.

Last verified on 10-06-2026

Explanation

• Total bones in adult human body = 206
• At birth = 270–300 bones (fuse to become 206)

The total bones of our body can be divided into:

• Axial skeleton = 80 bones
• Appendicular skeleton = 126 bones

Additional information:

• Newborn baby has 300 bones
• Longest bone = Femur
• Shortest bone = Stapes
• Bones in human skull = 22

Last verified on 30-03-2026

Explanation

• Mercury is the closest planet to the Sun, followed by Venus.
• Called an inner planet because it orbits inside Earth’s orbit.
• Number of moons: 0 (Mercury has no natural satellites).
• Size: Smallest planet in the solar system.
• Nickname: Swift Planet, due to its fast orbit around the Sun (≈88 days per orbit).

Last verified on 17-03-2026

Explanation

• Headquarters: Geneva, Switzerland
• UNHCR: United Nations High Commission for Refugees
• Founded: 1950
• Purpose: Protection and assistance of refugees
• Won Nobel Peace Prize: 1954

Additional information:

• WHO — Geneva, Switzerland
• UNICEF — New York, USA
• UNESCO — Paris, France
• ILO — Geneva, Switzerland
• WFP — Rome, Italy

Last verified on 19-01-2026

Explanation

• F5 key is used to refresh or reload a web page.
• It updates the page to show the latest content.
• Commonly used in browsers like Google Chrome and Mozilla Firefox.

Additional information:

• Ctrl + R → Refresh page
• Ctrl + Shift + R → Hard refresh (clear cache)
• F11 → Full screen mode
• Ctrl + T → Open new tab
• Ctrl + W → Close current tab

Last verified on 19-04-2026

Explanation

• IP stands for Internet Protocol.
• It is a set of rules used to address and route data between devices on a network.
• Every device on an IP network can be identified using an IP address.

Additional information:

• IPv4: Uses 32-bit addresses.
• IPv6: Uses 128-bit addresses.
• Example of IPv4: 192.168.1.1

Last verified on 27-09-2026

Explanation

• The first Prime Minister of Pakistan was Liaquat Ali Khan
• Tenure: 15-08-1947 to 16-10-1951.
• Party: Pakistan Muslim League.
• Secretary of the All-India Muslim League in 1936
• 1st Minister of Defence from 15 August 1947 – 16 October 1951
• 1st Minister of Foreign Affairs from 15 August 1947 – 27 December 1949
• Born: 1 October 1895, Karnal, Punjab, India
• Died: 16 October 1951 (aged 56), Rawalpindi
• Manner of death: Assassination

**

Last updated by NS on 5-09-2026

Explanation

• Capital: Tripoli
• Currency: Libyan Dinar
• Official language: Arabic
• Continent: Africa
• Religion: Islam

Additional information:

Memory Trick

DINAR → Countries using the dinar include:

• K — Kuwait
• S — Sudan

J-A-I-L

• J — Jordan
• A — Algeria
• I — Iraq
• L — Libya

Last verified on 27-09-2026

Explanation

• Date: 24 June 1945
• Presided by: Lord Wavell
• Place: Viceregal Lodge, Simla
• Main parties: Congress & All India Muslim League
• Purpose: Formation of Executive Council and constitutional settlement

Last verified on 14-05-2026