General Science Online Quiz Test

Energy of Ultraviolet rays is greater than Infrared rays. Radio waves have photons with the lowest energies. Microwaves have a little more energy than radio waves. Infrared has still more, followed by visible, ultraviolet, X-rays and gamma rays. Cosmic rays are (not part of the electromagnetic spectrum) high-energy outer space particles.

Magnetism in materials is due to circular motion of electrons. Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms. Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom.

The most common material used for the heating element is Nichrome. Nichrome is the alloy of the Nickel and chromium; in this alloy, the nickel is 80% and the chromium is 20%. It is corrosion-resistant and has a high melting point of about 1400 degree C.

An element which does not react with oxygen is Helium. The noble metals or inert gas do not react with oxygen. Helium (He), argon (Ar), neon (Ne), krypton (Kr), xenon (Xe), and radon (Rn), etc. are common inert gases.

Zinc is used to galvanise iron. Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base.

Cotton take more time to ignite but burns easily and quickly. Nylon, polyester and acrylic tend to be slow to ignite but once ignited, severe melting and dripping occurs. Rayon ignites easily but burns slower than cotton. Nylon is less flammable as well, but melts and can adhere to the skin.

Vertebrae is a series of bones that form the spinal column (backbone) of all vertebrates. The average person is born with 33 vertebrae that interact and connect with each other through flexible joints called facets. By the time a person becomes an adult most have only 24-26 vertebrae because some vertebrae at the bottom end of the spine fuse together during normal growth and development.

Diphtheria is a highly contagious, infectious disease caused by the bacteria Corynebacterium diphtheriae. It is a serious bacterial infection that usually affects the mucous membranes of the nose and throat.

Christiaan Neethling Barnard introduced the use of artificial heart for surgery. He was a South African cardiac surgeon who performed the world's first human-to-human heart transplant operation.

Coriander is an annual herb. Its Fresh leaves and dried seeds are most commonly used as food.