The Nobel Prize is a set of annual international awards bestowed in several categories by Swedish and Norwegian institutions in recognition of academic, cultural or scientific advances.

The term ‘Life Master’ is related to a card game called ‘Bridge’. It is played by four players in two competing partnerships, with partners sitting opposite each other around a table.

A hydrometer is an instrument that measures the specific gravity (relative density) of liquids - the ratio of the density of the liquid to the density of water.

Kinetic energy of air is used to run wind mills. It is the energy possessed by a virtue of its motion. If a body of mass m is moving with velocity v, then kinetic energy. KE= 1/2 mv². When momentum is doubled, then the kinetic energy becomes four times.

The main active constitute of tea and coffee is Caffeine. It is the world's most widely consumed psychoactive drug and unregulated in nearly all parts of the world.

Carl Scheele & Joseph Priestley discovered oxygen. Oxygen is a chemical element with atomic number 8 and symbol O. It is highly reactive which easily form oxides with other elements. It is non-metal and gaseous in nature. Oxygen was discovered in the year 1772.

Sodium benzoate is a common type of food preservative and is the sodium salt of benzoic acid. It is used to preserve fruit juices, syrups, jams and jellies, pickles etc. Food manufacturers make sodium benzoate by synthesizing the compounds, sodium hydroxide and benzoic acid, together.

Ferromagnetic substances are those substance, which when placed in a magnetic field, are strongly magnetised in the direction of the field.

Examples: Iron, Cobalt, Nickel etc.

Unit of physical quantity “Magnetic field strength(H)”, is amperes per meter (A/m).

The ozone layer is important because it absorbs ultraviolet (UV) radiation from the sun. Radiation in the UV spectrum has wavelengths just shorter than those of visible light. UV radiation with wavelengths between 280 and 315 nanometers is called UV-B, and is damaging to almost all forms of life. By absorbing most UV-B radiation before it can reach the earth's surface, the ozone layer protects the planet from the harmful effects of radiation.