Explanation

• Modem Full Form: Modulator-Demodulator
• Function: Converts digital signals to analog (and vice versa) for communication over telephone lines or networks
• Use: Connects one computer to another via the internet or network

Last verified on 08-02-2026

Explanation

Environmental Hazards in Sindh

Major Issues:

• Salinity: Increase in salt content in soil, reducing agricultural productivity
• Waterlogging: Excess water accumulation due to poor drainage and irrigation practices

Causes: Irrigation mismanagement, high water table, and climate variations

Last verified on 08-02-2026

Explanation

National Action Plan (Pakistan)

• Formulated: After the 2014 Army Public School attack in Pakistan
• Purpose: To combat terrorism and extremist activities

Last verified on 08-02-2026

Explanation

• Distance: Total path traveled by the car along the route
• Displacement: Shortest straight-line distance between start and end points
• Since Ali returned to the starting point, displacement = 0

Last verified on 08-02-2026

Explanation

• Also Known As: Growth Hormone (GH)
• Produced By: Pituitary gland
• Function: Stimulates normal growth of bones, muscles, and tissues

Additional information:

• Deficiency can lead to dwarfism, excess can cause gigantism
• Regulates protein synthesis and metabolism in the body

Last verified on 08-02-2026

Explanation

• Examples: Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn)
• Reason for Inactivity: Complete valence electron shell → chemically stable

Additional information:

• Rarely form compounds, mostly inert
• Used in lighting (Neon lights), welding (Argon), and as inert environments in laboratories

Last verified on 08-02-2026

Explanation

• Cause of Air Pollution: Vehicle emissions, industrial smoke, burning fossil fuels
• Effective Solution: Planting more trees absorbs CO₂ and releases oxygen

Additional information:

• Trees also trap dust, smoke, and harmful gases

Last verified on 08-02-2026

Explanation

• Condition: Kidneys fail to filter waste from blood (renal failure)
• Treatment: Dialysis removes waste and excess fluids from the blood artificially

Types of Dialysis:

• Hemodialysis: Blood filtered through a machine
• Peritoneal Dialysis: Uses lining of the abdomen to filter blood

Last verified on 08-02-2026

Explanation

• Protium (¹H₁): 0 neutrons, 1 proton
• Deuterium (²H₁): 1 neutron, 1 proton
• Tritium (³H₁): 2 neutrons, 1 proton

All have 1 proton and 1 electron, differ only in neutron number

Last verified on 08-02-2026

Explanation

• When the angle θ between force (F) and displacement (d) is 90°, cos90° = 0.
• Therefore, Work Done (W) = 0.

Additional information:

• Example: Carrying a bag horizontally while the force is vertical → no work is done.
• Work is maximum when force is along the displacement (θ = 0°).

Last verified on 08-02-2026