Explanation

• Polio can be effectively prevented through vaccines: Oral Polio Vaccine (OPV) and Inactivated Polio Vaccine (IPV).
• There is no cure or medication for polio, only prevention through immunization.

Last verified on 23-10-2026

Explanation

• Uranium deposits are found in Dera Ghazi Khan of Punjab.
• The uranium mill was also established in Pakistan in 1977-78.

Additional information:

• Kazakhstan is the biggest producer of Uranium in the world.
  
  
  Last verified on 22-10-2026

Explanation

• An electron carries a negative electric charge.
• Its charge is approximately −1.602 × 10⁻¹⁹ C.
• A proton has an equal magnitude of positive charge, while a neutron has zero electric charge.
• The charge of an electron is called the elementary charge with a negative sign.

Explanation

• The ozone layer protects the Earth from the sun.
• It is a part of the atmosphere that absorbs most of the harmful ultraviolet light from the sun.
• It sits in the stratosphere.
• It is about 9 to 18 miles above the Earth.
• It stops dangerous UV rays from hurting living things.

Last updated by NS on 14-8-2026

Explanation

Oxidation is the chemical process of:

• Losing electrons
• Oxidation state increases
• Always paired with reduction (together form redox)
• Reducing agent gets oxidized (it gives up the electrons)

Additional information 

Reduction:

• Gain electrons
• Oxidation state lowers
• Always paired with oxidation (redox)
• Oxidizing agent gets reduced

Last verified on 22-10-2026