General Science Online Quiz Test

If an object moving forward in a straight line is affected by gravity it will fall in a parabolic arc. Since projectiles are objects affected only by gravity, the path of a projectile moving forward from the momentum of an initial thrust is parabolic.

The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. The wavelength of the Visible Light ranges between 380 nm to 750 nm (3800 to 7500 angstroms). (The limits of the visible spectrum are not sharply defined but vary among individuals)

Sonar (sound navigation and ranging) is an equipment or a system for finding objects underwater using sound waves.

Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Hence, iron rust when they come into contact with water and oxygen – both are needed for rusting to occur.

Matter is any substance that has mass and takes up space by having volume. Pure matter can be either Elements or Compounds. Carbon dioxide is a pure matter. Examples of pure matter include carbon, oxygen, iron, table salt and water. Air is a homogeneous mixture. Brass and Steel are alloys, therefore it is a mixture.

The four common radioactive elements are Uranium, Radium, Polonium, Thorium, etc. Radioactive elements are made up of atoms whose nuclei are unstable and give off atomic radiation as part of a process of attaining stability. The emission of radiation transforms radioactive atoms into another chemical element, which may be stable or maybe radioactive such that it undergoes further decay.

The visual system of an ant is comprised of a pair of compound eyes and a set of simple eyes called ocelli.

The term 'Rh factor' refers to Rhesus factor. It is an inherited protein found on the surface of red blood cells.

Leukaemia is a cancer of the blood or bone marrow and is characterized by an abnormal proliferation of blood cells, usually white blood cells (leukocytes).

Polycyclic hydrocarbons (PAHs) are the constituents of automobile exhaust that can cause cancer. PAHs are ubiquitous environmental pollutants generated primarily during the incomplete combustion of organic materials (e.g. coal, oil, petrol, and wood). These PAHs are carcinogenic in nature i.e. leads to cancer.