Explanation

• Pressure is a fundamental physical quantity that is defined as the force exerted per unit area.
• It is a measure of the strength of a force acting on a surface.
• It is typically measured in units such as Pascals (Pa) or pounds per square inch (PSI).

Last verified on 10-02-2026

Explanation

In inverse proportion, when one quantity increases, the other decreases in the same ratio.

Their product remains constant: x × y = constant.

Last verified on 09-02-2026

Explanation

Rock salt is also known as halite.

It is the mineral form of sodium chloride (NaCl)

It is commonly used for de-icing roads and as table salt in cooking.

Explanation

WTO (World Trade Organization) was established on 1 January 1995.

It succeeded GATT.

Pakistan joined WTO on 1 January 1995.

Additional information:

• Members: 164
• Headquarters: Geneva, Switzerland
• Official Languages: English, French, Spanish

Objectives:

• Protect Intellectual Property Rights
• Promote Free Trade
• Remove Trade Quotas

Last verified on 16-01-2026

Explanation

Explanation

• The standard keyboard shortcut to insert a hyperlink is Ctrl + K on Windows and Command + K on Mac
  
  
  
  Additional information:
  • Ctrl + S → Save
  • Ctrl + M → Indent paragraph

Last verified on 17-01-2026

Explanation

• Main Cause: Freon / CFCs
• Effect: Breaks down O₃ molecules → more UV-B radiation
• Other Contributors: Halons, carbon tetrachloride
• Result: Skin cancer, cataracts, climate impact

• The Montreal Protocol (1987) aimed to reduce CFC emissions
• Ozone layer protects Earth from harmful ultraviolet rays

Explanation

Water has maximum density at 4°C.

When Water is in its Solid form (Ice) below 0°C.

Explanation

• Carbon dioxide (CO2) is a major greenhouse gas.
• It responsible for about 65% of the Earth's greenhouse effect.

Explanation

ISP stands for Internet Service Provider — a company that provides access to the Internet.

Examples include PTCL, StormFiber, and Nayatel.