General Science Online Quiz Test

Anemometer is an instrument used to measure the force, pressure and velocity (speed) of the wind. It is an important tool for meteorologists, who study weather patterns.

The total energy of an electron in an atom in an orbit is −3.4eV. The total energy is the sum of the electron's kinetic energy (3.4 eV) and the potential energy (-6.8 eV) coming from the electron-proton interaction.

Raindrops start to form in a roughly spherical structure due to the surface tension of water. Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible.

Sulphur is added to make natural rubber more strong and more bouncy. Vulcanization is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulphur, which results in three-dimensional cross-linking of the chain rubber molecules (polyisoprene) bonded to each other by sulphur atoms.

Chlorophyll is the natural compound present in green plants that gives them their colour. It consists of a central magnesium atom surrounded by a nitrogen-containing structure called a porphyrin ring; attached to the ring is a long carbon-hydrogen side chain, known as a phytol chain. Calcium is not a component of chlorophyll.

Combustion is a chemical process. It is a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.

The average normal body temperature is generally accepted as 98.6°F (37°C).

To measure blood pressure, doctor uses an instrument called a sphygmomanometer, which is more often referred to as a blood pressure cuff.

Saccharin is not a plant product. It is a non-nutritive or artificial sweetener. It's made in a labouratory by oxidizing the chemicals o-toluene sulfonamide or phthalic anhydride. It looks like white, crystalline powder.

The world's smallest flowering plant is the watermeal, or Wolffia globosa.