Explanation

• Viruses are non-cellular and obligate intracellular parasites.
• They cannot carry out life processes or reproduce without a living host cell.
• Viruses contain either DNA or RNA.
• They are considered to be at the boundary between living and non-living.
• The branch of science that studies viruses is called Virology.

Last verified on 27-07-2026

Explanation

• Geostationary satellites are located directly above the equator. 
• Altitude: About 35,786 kilometers (22,236 miles) above sea level.
• Speed and Direction: Moves from west to east, matching the Earth's rotation speed.
• Time Period: Exactly 24 hours (one rotation day). 

Last updated 26-07-2026 by NA

Explanation

• Wilhelm Conrad Rontgen discovered X-rays
• He was discovered on 8 November 1895.
• He got the Nobel Prize in Physics in 1901.

Additional questions

• The penetrating power of X-rays depends on their frequency

Last updated 26-07-2026 by NA

Explanation

• The atomic number of hydrogen is 1.
• It is the first element on the periodic table. 
• Named by: Antoine Lavoisier (1783)
• Atomic mass: 1.00784 u
• Appearance: Colorless gas
• Symbol: H
• Protons: 1
• Electrons: 1

Last updated 26-07-2026 by NA

Explanation

• A vegan avoids animal products, including meat, dairy, eggs, and often other animal-derived products.

Additional information 

• Vegetarian: Does not eat meat, but may eat dairy and eggs.
• Carnivore: Eats only meat.
• Omnivore: Eats both plants and meat. 

Last updated 26-07-2026 by NA

Explanation

• A Pycnocline is an ocean layer where water density changes rapidly with depth.
• Density changes mainly due to variations in temperature and salinity.
• It acts as a barrier that limits the mixing of surface and deep waters.

Additional information:

• Thermocline: Rapid change in temperature
• Halocline: Rapid change in salinity

Last verified on 26-07-2026

Explanation

• Sunlight travels at the speed of light (~3 × 10⁸ m/s).
• Takes 8 minutes 20 seconds on average to reach Earth.
• Sunlight takes approximately 499 seconds to travel from the Sun to Earth.
• Distance traveled: 150 million km from Sun to Earth.
• Moonlight takes only 1.3 seconds to reach Earth.

Last verified on 13-03-2026

Explanation

• A rainbow is produced due to the dispersion of sunlight by water droplets in the atmosphere.
• White sunlight splits into seven colours when it passes through raindrops.
• The formation of a rainbow involves refraction, dispersion, and internal reflection.
• Dispersion is the phenomenon responsible for separating white light into its constituent colours.
• Rainbows are usually seen opposite the Sun after rainfall.

Last verified on 26-07-2026

Explanation

• Mathematics is widely known as the "Mother of All Sciences".
• Because it provides the foundation for scientific and technological disciplines.
• It is essential for physics, chemistry, engineering, economics, and computer science.
• Mathematical principles are used in measurement, calculations, modeling, and problem-solving.
• The word Mathematics comes from the Greek word "Mathema," meaning knowledge or learning.

Last verified on 26-07-2026

Explanation

• Blood pressure readings use two numbers: systolic (top) and diastolic (bottom).
• An ideal normal reading is less than 120/80 mm Hg.
• Cardiac output: More blood pumped by the heart → higher BP.
• Blood volume: Increased blood volume → increased BP.

Last updated 25-07-2026 by NA