Correct Answer :   22 December

22 December is a special day for mathematics. This day is observed as National Mathematics Day to celebrate the achievements of Srinivasa Ramanujan. The legendary mathematician was born on this day in 1887. In 2012, then prime minister Manmohan Singh declared 22 December as National Mathematics Day.

Correct Answer :   212⁰F

Water boils at 100⁰C or 212⁰F at one atmosphere of pressure. Liquids boil when the pressure of the atmosphere is equal to the pressure of the liquid. When the pressure of the atmosphere is reduced a liquid boils at a lower temperature. This is what happens when you climb a mountain.

Correct Answer :   Geology

Geology - Study of the structure of the Earth | Britannica.

Correct Answer :   12

In Western astrology, and formerly astronomy, the zodiac is divided into twelve  (12) signs, each occupying 30° of celestial longitude and roughly corresponding to the constellations: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces.

Correct Answer :   Samuel Hahnemann

The main principle of homeopathy, a unique scientific system of medicine established by Samuel Hahnemann two centuries ago, is that of 'similia' or 'simile' (similarity), which means 'let likes be cured by likes'.

Correct Answer :   fresh

Fresh water (or freshwater) is any naturally occurring water containing low concentrations of dissolved salts and other total dissolved solids. ... Fresh water may include water in ice sheets, ice caps, glaciers, icebergs, bogs, ponds, lakes, rainfall, rivers, streams, and groundwater contained in underground aquifers.

Correct Answer :   Research on gravitational waves

The Laser Interferometer Gravitational-Wave Observatory (LIGO) - India is a planned advanced gravitational-wave observatory to be located in India as part of the worldwide network, whose concept proposal is now under active consideration in India and the USA.

Correct Answer :   Gold

Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious metal known to man.

Correct Answer :   ionosphere

Extending from about 80 to 300 km (about 50 to 185 miles) in altitude, the ionosphere is an electrically conducting region capable of reflecting radio signals back to Earth.

Correct Answer :   Carbon-dioxide

Global warming occurs when carbon dioxide (COâ‚‚) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth's surface.