Explanation

• The Troposphere contains about 75% of the atmosphere's mass.
• It is the lowest layer of Earth's atmosphere.
• Altitude Range: About 8 km at poles to 15–18 km at equator.
• Main Gases: Nitrogen (78%), Oxygen (21%), and other gases.ev

Verified & Updated

Explanation

• In a nuclear reactor, energy is produced due to a controlled chain reaction.
• A controlled chain reaction releases energy steadily and safely.
• Control rods are used to regulate the number of neutrons and prevent excessive reactions.
• This controlled process is used to generate electricity in nuclear power plants.

Additional information:

• An uncontrolled chain reaction occurs in nuclear bombs.

Last verified on 11-07-2026

Explanation

Formula:  

Mean = Sum of observations / Number of observations  

Given:  

Mean = 50  

Number of observations = 10  

Sum of observations = Mean _ Number of observations  

= 50 _ 10  

= 500

Last verified on 11-07-2026

Explanation

• Extrusion is a manufacturing process in which metal is pressed through a shaped die under high pressure to produce the desired shape.
• It is used to manufacture products with a uniform cross-section.
• The process can be performed on hot or cold metal.
• Extrusion is widely used to produce rods, tubes, pipes, and structural sections.
• It provides a smooth surface finish and reduces material wastage.

Last verified on 10-07-2026

Explanation

• Asteroids travel around the Sun in elliptical orbits.
• Most asteroids are found in the Asteroid Belt between Mars and Jupiter.
• Their orbits follow Kepler's Laws of Planetary Motion.
• The shape of the orbit may vary from nearly circular to highly elliptical.
• Asteroids are small rocky bodies that revolve around the Sun.

Last verified on 10-07-2026