Explanation

• The usual gases used for lifting airships are hydrogen and helium.
• Hydrogen is the lightest known gas and thus has great lifting capacity,
• Helium is not as buoyant but is far safer than hydrogen because it does not burn.

Last verified on 01-04-2026

Explanation

• Because sound is just vibrating air, space has no air to vibrate and therefore no sound in a vacuum.
• Sound waves below 20 Hz are known as infrasound.
• Sound waves above 20 kHz are known as ultrasound.

Sound waves transmit a medium such as a gas, liquid, or solid.

• The speed of sound in air is about 343 meters per second.
• The sound travels at 1,481 m/s in water.
• The speed of sound in a vacuum is zero meters per second.

Last verified on 07-06-2026

Explanation

• The Arctic is the shortest ocean in the world.

Additional information:

• The Pacific is the largest ocean in the world.
• 71% of Earth's surface is covered by ocean.
• The warmest ocean in the world is the Indian ocean.
• The hottest ocean area is the Persian Gulf.
• Diamantina Trench is the deepest place in the Indian ocean.
• Country Jordon has no ocean.

The five major oceans listed by size from largest to smallest are the:

1. The Pacific Ocean
2. The Atlantic Ocean
3. The Indian Ocean
4. The Southern Ocean
5. The Arctic Ocean

Last verified on 07-06-2026

Explanation

• The smallest province of Pakistan by area is KPK.
• Balochistan is the largest province of Pakistan by area.
• Area wise second largest province of Pakistan is Punjab.

Last verified on 30-03-2026

Explanation

• Ctrl + Z used for = Undo

Additional information:

• Ctrl + X used for = Cut
• Ctrl + Y used for = Redo

Last verified on 07-06-2026

Explanation

• A Modem (Modulator-Demodulator) converts digital signals into analog signals and vice versa.
• It is used to connect computers to the internet via telephone lines or other networks.

Additional information:

• Switch – connects multiple devices in a network
• Hub – basic network connector
• Repeater – boosts signal strength
• Router – directs internet traffic

Last verified on 19-04-2026

Explanation

Explanation

• She suggested meeting after class.
• After the verb “suggest”, we use a gerund (verb + ing), not an infinitive.
• “Meeting” correctly functions as the object of the verb “suggested”.

Last verified on 07-06-2026

Explanation

• Dr. Shamshad Akhtar was the first female Governor of the State Bank of Pakistan (SBP).
• She served as Governor from 2006 to 2009.

Additional information:

• Founded: 1 July 1948
• Founder: Muhammad Ali Jinnah
• Headquarters: Karachi, Sindh
• First Governor: Zahid Hussain

Last verified on 06-06-2026

Explanation

The first constitution of Pakistan was enforced on March 23, 1956

Additional information

List of the Constitution of Pakistan 1947 to date

First:   1956 Constitution

• Adoption Date: 23rd March 1956

• Prime Minister: Chaudhry Muhammad Ali

• President: Iskander Mirza

Second: 1962 Constitution

• Adoption Date: 8th June 1962

• Prime Minister: Muhammad Ayub Khan (also President at the time)

Third: 1973 Constitution

• Adoption Date: 12th April 1973

• Prime Minister: Zulfikar Ali Bhutto

• President: Fazal Ilahi Chaudhry

  
  

  Last updated by NA on 25-April-2026