Explanation

• Every element is identified by the number of protons in its nucleus.
• This number determines the identity of the element.
• It is written as Z in chemistry.
• It is always equal to the number of electrons in a neutral atom.
• This is called the atomic number.

Last verified on 12-04-2026

Explanation

• Earth water coverage: 71%
• Land area: 29%
• Ocean water: 97% of total water
• Fresh water: 3% of total water
• Largest ocean: Pacific Ocean

Last verified on 10-04-2026

Explanation

• Platelets, also called thrombocytes.
• They are blood cells that play a vital role in blood clotting.
• When a blood vessel is injured, platelets aggregate to form a plug that stops the bleeding.

Last verified on 02-04-2026

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Last verified on 02-04-2026

Explanation

• The Moon is Earth’s only natural satellite.
• Diameter – 3,474 km
• Distance from Earth – 384,400 km
• Orbital period – 27.3 days
• Surface gravity – 1/6th of Earth
• First human landing – Apollo 11, 1969

Last verified on 18-03-2026

Explanation

• Violet light has the smallest wavelength, approximately 380-450 nanometers (nm).
• While red light has the longest wavelength, approximately 620-750 nanometers (nm).
• The order of colors in the spectrum, from longest to shortest wavelength, is: Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV).

Last verified on 01-04-2026

Explanation

• Conductors are materials that allow electricity to flow through them, such as copper, aluminum, and gold.
• They have a high concentration of free electrons, which are able to move freely within the material.

Additional information:

• Materials that do not allow electricity to pass through them are called insulators.

Last verified on 07-03-2026

Explanation

• The average adult has a blood volume of about 5 liters (5-6 litres), though this can range from 4.5 to 5.5 liters.
• Male: About 5.5 liters.
• Female: About 4.5 liters.
• Proportion: Blood makes up roughly 7% of a person's total body weight. 

Last verified on 30-03-2026

Explanation

• Red stars (Red Dwarfs) are the coolest stars in the universe.
• Their surface temperature is around 3000°C (5400°F).
• Red dwarfs burn their fuel very slowly, lasting trillions of years.

Last verified on 19-03-2026

Explanation

• Galileo Galilei is credited with creating his own improved version of the telescope in 1609.
• It based on the design of the "Dutch perspective glasses".
• He was the first to observe moons of Jupiter, Saturn’s rings, and lunar craters through a telescope.

Last verified on 19-03-2026