Explanation

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

Explanation

Carrot is a good source of Vitamin A. 

Deficiency of Vitamin A causes nigh blindness.

Explanation

 Leukemia is cancer of the body's blood-forming tissues, including the bone marrow and the lymphatic system.

Many types of leukemia exist.

Some forms of leukemia are more common in children.

Other forms of leukemia occur mostly in adults.

Explanation

Lack of insulin causes diabetes.

Diabetes is a condition that happens when your blood sugar (glucose) is too high.

It develops when your pancreas doesn't make enough insulin.

Explanation

• Inventor: Laszlo Biro
• Nationality: Hungarian-Argentine.
• Invented: 1938.
• Purpose: Smoother writing than fountain pens

Last updated by NA on 05-11-2026

Explanation

Explanation

Railway tracks are made of steel, which expands in summer heat.

The gaps between rails allow space for this expansion, preventing the tracks from buckling or derailing trains.

Explanation

Methane is the simplest of saturated hydrocarbons with a chemical formula CH4.

It consists of four hydrogen atoms and one carbon atom.

It is the simplest alkane.

Explanation

Guglielmo Marconi was an Italian inventor and electrical engineer who is credited with the invention of the radio.

His work on long-distance radio transmission and the development of Marconi's law revolutionized wireless communication in the early 20th century.

Explanation

Pulse beat is measured from an artery because it reflects the rhythmic pumping of the heart.

Common sites include the radial artery (wrist) and carotid artery (neck).