Explanation

• Blue light has the shortest wavelength.
• In the visible spectrum, wavelength decreases from red to violet.

Additional information:

• Red light rays have the lowest frequency and highest wavelength value.

Last verified on 10-06-2026

Explanation

• O₃ is the chemical formula of ozone gas.
• Ozone is an allotrope of oxygen containing three oxygen atoms.
• It is mainly found in the stratosphere, where it forms the ozone layer.
• The ozone layer protects Earth from harmful ultraviolet (UV) radiation.

Last verified on 30-06-2026

Explanation

• Sea water contains a high amount of dissolved salts.
• Because of salinity, its freezing point is lower than fresh water.
• Fresh water freezes at 0°C, but saltwater freezes at a lower temperature.

Last verified on 01-06-2026

Explanation

• The chemical name of chalk is Calcium carbonate.
• Its chemical formula is CaCO₃.
• It is a soft, white mineral.
• Commonly used in blackboard chalk and limestone.
• Found naturally in rocks and marine shells.

Last verified on 30-04-2026

Explanation

• Double landlocked means a land-locked country that is also surrounded by landlocked neighboring countries.
• Uzbekistan is bordered by Afghanistan, Kazakhstan, Kyrgyzstan, Tajikistan, and Turkmenistan.
• Liechtenstein bordered by Austria and Switzerland.

Last verified on 09-03-2026

Explanation

• Captain Muhammad Sarwar Shaheed was the first soldier to be awarded the Nishan-e-Haider
• Born: 10 November 1910, Singhori village, Rawalpindi District
• Died: 27 July 1948 (aged 37), Uri, Jammu and Kashmir, India.
• Buried: Hill of Tilpatra near Uri, Jammu and Kashmir in India
• Service years: 1929–1948
• Allegiance
• British India (1929–1947)
• Pakistan (1947–1948)

Nishan-e-Haider has been awarded to 11 soldiers since Pakistan's independence in 1947.

1. Captain Muhammad Sarwar (1948, Kashmir)
2. Naik Saif Ali Janjua (1948, Kashmir)
3. Major Tufail Muhammad (1958, East Pakistan)
4. Major Raja Aziz Bhatti (1965, Indo-Pak War)
5. Pilot Officer Rashid Minhas (1971, Indo-Pak War)
6. Major Muhammad Akram (1971, Indo-Pak War)
7. Major Shabbir Sharif (1971, Indo-Pak War)
8. Sowar Muhammad Hussain (1971, Indo-Pak War)
9. Lance Naik Muhammad Mahfuz (1971, Indo-Pak War)
10. Captain Karnal Sher Khan (1999, Kargil War)
11. Havildar Lalak Jan (1999, Kargil War)

Explanation

The outermost layer of the Sun is called the corona.

It is the Sun's outer atmosphere, extending millions of kilometers into space and visible during a total solar eclipse.

The innermost layer is the core, where nuclear fusion occurs.

Explanation

• Pakistan’s continental shelf officially extends up to 350 nautical miles from its baseline.
• A continental shelf is the extended perimeter of a country’s land under the sea.

Additional information:

• Pakistan submitted its extended shelf claim to the UN in 2015.
• The EEZ (Exclusive Economic Zone) limit is 200 NM, but the continental shelf can extend further.

Last verified on 15-01-2026

Explanation

• Nature of Disease: Chronic and progressive
• Main Causes: Hepatitis B & C, alcohol abuse, fatty liver disease
• Effect: Scarring (fibrosis) reduces liver efficiency

Explanation

Steel is more elastic than rubber because the ratio of stress to strain is more for steel.

This indicates that steel deforms less under the same amount of stress compared to rubber, making it more elastic.