● Osmium is the densest stable element known on Earth.

● Osmium is a chemical element with the symbol Os and atomic number 76.

● It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores.

* A barometer is a scientific instrument that is used to measure air pressure in a certain environment. Pressure tendency can forecast short term changes in the weather.

* Many measurements of air pressure are used within surface weather analysis to help find surface troughs, pressure systems and frontal boundaries.

* Option B has incorrect sentence. It can be corrected as ‘sudden fall in barometric reading is the indication of storm.’

* Rest sentences are correct.

* The Luni is the largest river in the Thar Desert of northwest India.

* It originates in the Pushkar valley of the Aravalli Range, near Ajmer, passes through the southeastern portion of the Thar Desert, and ends in the marshy lands of Rann of Kutch in Gujarat, after travelling a distance of 495 km.

* It is first known as Sagarmati, then after passing Govindgarh, it meets its tributary Sarasvati, which originates from Pushkar Lake and from then on it is called Luni.

• The tibia is a large bone located in the lower front portion of the leg.
• The tibia is also known as the shinbone and is the second largest bone in the body.
• There are two bones in the shin area: the tibia and fibula, or calf bone.
• The fibula is smaller and thinner than the tibia.
• These two bones connect the ankle to the knee and work together to stabilize the ankle and provide support to the muscles of the lower leg; however, the tibia carries a significant portion of the body weight.

● FIEO stands for Federation of Indian Export Organisation.

● It is a trade promotion organisation set up by the Ministry of Commerce, Government of India, and private trade and industry in India.

● It was formed in 1965 and headquarters are in Niryat Bhawan, New Delhi.

• Tim Berners-Lee is a British computer scientist who invented the 'World Wide Web'.
• He wrote the first web browser computer program in 1990 while employed at CERN in Switzerland.
• World Wide Web is an information space where documents and other web resources are identified by Uniform Resource Locators (URLs), interlinked by hypertext links, and can be accessed via the Internet.

● The fundamental particles present in the nucleus of an atom are Neutron and Proton.

● It was discovered in 1911 by Ernest Rutherford.

● The nucleus has an overall positive charge as it contains the protons.

* Qutab-ud-din Aibak, the first Muslim ruler of Delhi, commenced the construction of the Qutab Minar in 1200 AD, but could only finish the basement.

* His successor, Iltutmush, added three more storeys, and in 1368, Firoz Shah Tughlak constructed the fifth and the last storey.

* The development of architectural styles from Aibak to Tughlak is quite evident in the minar. The 238 feet Qutab Minar is 47 feet at the base and tapers to nine feet at the apex.

● Garadi is the folk dance of Puducherry.

● It has a mythological origin and it is performed during all festivals in the region.

● Karaga is a folk dance of Karnataka and parts of Tamil Nadu.

● Sattriya dance form was introduced in the 15th century A.D by the great Vaishnava saint and reformer of Assam.

● Puducherry is the 29th most populous and the third most densely populated union territory.

• The White Tiger is the debut novel by Indian author Aravind Adiga.

• It was first published in 2008.

• This book won the 40^th Man Booker Prize in 2008.

• The White Tiger follows a darkly comic Bangalore driver through the poverty and corruption of modern India’s caste society.

• Aravind Adiga is the author of Selection Day, the Booker Prize-winning novel The White Tiger, and the story collection Between the Assassinations.