Explanation

• A Leap Year is an astronomical year with an extra day.

Additional information:

• Leap Year: 366 days (February has 29 days).
• Common Year: 365 days (February has 28 days).
• Solar Year: Approximately 365.2422 days (Earth's revolution around the Sun).
• Lunar Year: About 354 days (12 lunar months).
• Recent Leap Years: 2016, 2020, 2024, 2028, 2032.

Last verified on 21-07-2026

Explanation

• Ocean waves generate Hydrokinetic Energy.
• Hydrokinetic energy is produced from the movement of ocean waves, tides, and flowing water without the need for a dam.
• It is a clean, renewable, and environmentally friendly source of energy.

Last verified on 21-07-2026

Explanation

• Pakistan produces a huge amount of its electricity from Hydropower.
• Major hydropower stations are located on the Indus River system.

Additional information:

Major Hydropower Dams:

• Tarbela Dam (Khyber Pakhtunkhwa)
• Mangla Dam (Azad Jammu & Kashmir)
• Ghazi-Barotha Hydropower Project
• Warsak Dam
• Neelum–Jhelum Hydropower Project

Major Sources of Electricity in Pakistan:

• Hydropower
• Natural Gas
• Coal
• Nuclear Energy
• Solar & Wind Energy

Last verified on 21-07-2026

Explanation

• The value 332 m/s is measured under standard atmospheric conditions.

Additional information:

• Speed of sound in air at 20°C ≈ 343 m/s.
• Speed of sound is faster in solids than liquids and gases.

Examples:

• Air: ~332 m/s (0°C)
• Water: ~1,480 m/s
• Steel: ~5,100 m/s

Last verified on 21-07-2026

Explanation

• The Mantle is the middle layer located between the crust and the core.
• It is the thickest layer of the Earth.
• It is made of hot, semi-solid rock.
• Thickness of Mantle: About 2,900 km
• Earth's Average Radius: About 6,371 km

Additional information:

• The Earth has three main layers: Crust, Mantle, and Core.
• Outermost layer: Crust
• Innermost layer: Core

Last verified on 21-07-2026