Explanation

• Diffusion is the natural movement of particles from an area of higher concentration to lower concentration without external force.
• It occurs in gases, liquids, and even solids to some extent.

Last verified on 14-10-2026

Explanation

• Earth is called the Blue Planet.
• About 71% of Earth's surface is covered by water.
• Water makes Earth appear blue from space.
• Earth is the third planet from the Sun.
• Earth’s natural satellite is the Moon

Last updated: NA on 26-09-2026

Explanation

• SARS-CoV-2: Coronavirus that causes COVID-19.
• First identified: Late 2019.
• Transmission: Mainly through respiratory particles.
• COVID-19: Stands for Coronavirus Disease 2019.

Last updated 07 Nov 2026 by NA

Explanation

• Genetics: Study of heredity and variation in organisms.
• An Austrian monk who experimented with pea plants in the 19th century is known as the "Father of Modern Genetics"

Additional information

• Ecology: Study of organisms and their environment.
• Anatomy: Study of the structure of organisms.
• Evolution: Study of how living organisms change over generations.

Last updated by NA on 06-11-2026

Explanation

• The Theory of Relativity was proposed by Albert Einstein.
• It was introduced in the early 20th century.
• It includes Special Relativity (1905) and General Relativity (1915).
• The theory explains the relationship between space, time, and gravity.

Last verified on 02-04-2026

Explanation

• Venus is the brightest planet in the night sky.
• Due to its thick cloud cover that reflects sunlight strongly.
• It is often called the “Evening Star” or “Morning Star.”

Additional information:

• Distance from Sun: ~108 million km
• Diameter: 12,104 km
• Orbital Period: 225 Earth days
• Atmosphere: Thick CO₂ clouds, very reflective

Last verified on 15-01-2026

Explanation

• Aeroplanes fly in the troposphere.
• It is the lowest layer of the Earth's atmosphere.
• It extending up to about 12 km (7.5 miles) above the Earth's surface.
• The troposphere is where weather occurs, and it's the layer where aircraft operate.
• It typically cruising at altitudes between 30,000 to 40,000 feet (9,100 to 12,200 meters).

Additional information:

• Stratosphere: Contains the ozone layer.
• Mesosphere: Most meteors burn up here.
• Thermosphere: Includes much of the ionosphere and auroras.

Last verified on 12-10-2026

Explanation

• Cause: Mainly due to sulfur dioxide (SO₂) released from burning fossil fuels like coal and oil.
• Effect: SO₂ reacts with water vapor in the atmosphere to form sulfuric acid, causing acid rain.

Last verified on 08-02-2026

Explanation

• The electromagnetic force acts between electrically charged particles.
• It causes both attraction and repulsion between charged particles.
• It is responsible for electricity, magnetism, light, and chemical bonding between atoms.

Additional information:

• Gravitational force: Acts between objects with mass and energy.
• Strong nuclear force: Holds quarks together and helps bind atomic nuclei.
• Weak nuclear force: Responsible for processes such as beta radioactive decay.

Last verified on 12-10-2026

Explanation

• The part of the eye that controls the amount of light entering is the Iris.
• It adjusts the size of the pupil according to light intensity.
• In bright light, it reduces light entry; in dim light, it allows more light in.
• This process protects the retina and helps clear vision.

Last verified on 17-05-2026