Explanation

• The atmospheric pressure at any place is measured by a Barometer.
• The barometer was invented by Evangelista in 1644.

Last verified on 10-03-2026

Explanation

Explanation

• Speed: ~300,000 km/s (exactly 299,792 km/s)
• Symbol: c
• Medium: Vacuum (space)
• Type: Electromagnetic waves
• Constant: Universal physical constant

Last verified on 16-05-2026

Explanation

• Thar Desert is the largest desert in Pakistan.
• It is the only subtropical desert in Asia.
• It is the 3rd largest in Asia.
• It spans an area of 175,000 square kilometers.
• It covers large areas of Pakistan and India.

Pakistan hosts five major deserts which were historic forests:

1. Cholistan (Bahawalpur, Punjab)
2. Thal (Bakhar district of Punjab)
3. Katpana desert (Sakardu)
4. Kharan desert (Balochistan)
5. Thar desert (Sindh)

Last verified on 02-04-2026

Explanation

• Scarce means مختصر فراہمی یا نایاب میں
• Plentiful means وافر مقدار میں یا بڑی مقدار میں دستیاب ہے
• Abundant means وافر

Last verified on 28-06-2026

Explanation

• Nitrogen (N₂) → 78%

Additional information:

• Oxygen (O₂) → 21%
• Argon (Ar) → 0.93%
• Carbon dioxide (CO₂) → 0.04% (approximately)
• Other gases → Trace amounts

Last verified on 28-06-2026

Explanation

• Standard Meridian of Pakistan: 75° E
• Time Zone: Pakistan Standard Time (PST)
• Difference from UTC: +5 hours
• Reference point: Greenwich Meridian (0° longitude)
• Total longitudes on Earth: 360° (180° East + 180° West)

Last verified on 28-06-2026

Explanation

• For is used to show a duration of time (five years).
• Since is used with a specific starting point (e.g., since 2020, since Monday).
• Present perfect continuous (has been working) is correct for an action continuing from the past until now.

Last verified on 28-06-2026

Explanation

• Farad (F) is the SI unit of capacitance of a capacitor.
• Capacitance is the ability of a capacitor to store electric charge.
• One farad is equal to one coulomb of charge stored per one volt of potential difference.
• The unit is named after scientist Michael Faraday.

Additional information:

• Energy / Work → Joule (J)
• Electric Charge → Coulomb (C)
• Pressure → Pascal (Pa)
• Electric Current → Ampere (A)
• Power → Watt (W)
• Resistance → Ohm (Ω)
• Temperature → Kelvin (K)
• Torque → Newton metre (N·m)
• Velocity → metre per second (m/s)
• Acceleration → metre per second² (m/s²)

Last verified on 28-06-2026