Practice MCQ Questions and answers on General Science-GK

Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits.

Carbon, diamond and graphite are together called Allotrope.

Used in solid propellants, explosives, fertilizers. Potassium nitrate is the inorganic nitrate salt of potassium. It has a role as a fertilizer.

Temporary hardness can be removed by boiling or by addition of Ca(OH)₂. Permanent hardness can be removed by the addition of washing soda commonly known as sodium carbonate.

Carbonated water or Soda water is water that has been infused with carbon dioxide gas under pressure. It is carbonic acid. This produces a bubbly drink that's also known as sparkling water, club soda, soda water, seltzer water and fizzy water. With the exception of seltzer water, they usually have salt added to improve the taste.

Bauxite is the most important ore of aluminum which contains only 30–54% alumina, Al₂O₃.

Most soluble in water is Sugar.

The chromosphere (literally, "sphere of colour') is the second of the three main layers in the Sun's atmosphere and is roughly 2,000 kilometers deep. It sits just above the photosphere and just below the solar transition region. Helium, the lighter of the noble gases, was the first to be discovered. In fact, this element was first identified in the Sun's chromosphere rather than in the Earth.

The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg). Although, elements caesium (Cs), rubidium (Rb), Francium (Fr) and Gallium (Ga) become liquid at or just above room temperature.

Sodium is the metal stored in kerosene oil in order to prevent it from coming in contact with oxygen and moisture.