A comet is a small, icy celestial body that orbits around the sun. It is made up of a nucleus (solid, frozen ice, gas and dust), a gaseous coma (water vapor, CO2, and other gases) and a long tail (made of dust and ionized gases). The tail develops when the comet is near the Sun. The tail can be up to 250 million km long, and is most of what we see. Comets are only visible when they’re near the sun in their highly eccentric orbits.

Correct Option: C

A comet is a small, icy celestial body that orbits around the sun. It is made up of a nucleus (solid, frozen ice, gas and dust), a gaseous coma (water vapor, CO2, and other gases) and a long tail (made of dust and ionized gases). The tail develops when the comet is near the Sun. The tail can be up to 250 million km long, and is most of what we see. Comets are only visible when they’re near the sun in their highly eccentric orbits.

The Magellan spacecraft, also referred to as the Venus Radar Mapper, was a 1,035-kilogram (2,280 lb) robotic space probe launched by NASA on May 4, 1989, to map the surface of Venus using Synthetic Aperture Radar and measure the planetary gravity. It was the first interplanetary mission to be launched from the Space Shuttle, the first to use an inertial upper stage booster and was the first spacecraft to test aerobraking as a method for circularizing an orbit. Magellan was the fourth successful, NASA funded mission to Venus and ended an eleven year U.S. interplanetary exploration hiatus.

Correct Option: B

The Magellan spacecraft, also referred to as the Venus Radar Mapper, was a 1,035-kilogram (2,280 lb) robotic space probe launched by NASA on May 4, 1989, to map the surface of Venus using Synthetic Aperture Radar and measure the planetary gravity. It was the first interplanetary mission to be launched from the Space Shuttle, the first to use an inertial upper stage booster and was the first spacecraft to test aerobraking as a method for circularizing an orbit. Magellan was the fourth successful, NASA funded mission to Venus and ended an eleven year U.S. interplanetary exploration hiatus.

The Indian Space Research Organisation (ISRO) is the primary space agency of the Indian government. ISRO is amongst the six largest government space agencies in the world, along with NASA, RKA, ESA, CNSA and JAXA. Its primary objective is to advance space technology and use its applications for national benefit. Established in 1969, ISRO superseded the erstwhile Indian National Committee for Space Research (INCOSPAR). Headquartered in Bangalore, ISRO is under the administrative control of the Department of Space, Government of India. ISRO has achieved numerous milestones since its establishment.

Correct Option: B

The Indian Space Research Organisation (ISRO) is the primary space agency of the Indian government. ISRO is amongst the six largest government space agencies in the world, along with NASA, RKA, ESA, CNSA and JAXA. Its primary objective is to advance space technology and use its applications for national benefit. Established in 1969, ISRO superseded the erstwhile Indian National Committee for Space Research (INCOSPAR). Headquartered in Bangalore, ISRO is under the administrative control of the Department of Space, Government of India. ISRO has achieved numerous milestones since its establishment.

A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth’s rotation period. Such a satellite returns to the same position in the sky after each sidereal day, and over the course of a day traces out a path in the sky that is typically some form of analemma.

Correct Option: A

A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth’s rotation period. Such a satellite returns to the same position in the sky after each sidereal day, and over the course of a day traces out a path in the sky that is typically some form of analemma.

Pokhran is a city and a municipality located in Jaisalmer district in the Indian state of Rajasthan. It is a remote location in the Thar Desert region and served as the test site for India’s first underground nuclear weapon detonation. It shot into the international limelight on 7 September 1974 when the then Indian Prime Minister Indira Gandhi verbally authorized scientists at the Bhabha Atomic Research Centre (BARC) at Trombay to detonate small and miniaturized nuclear device. Throughout its development, the device was formally called the “Peaceful Nuclear Explosive (PNE)” by Indian Government, but it was usually referred to as the Operation Smiling Buddha. On May 11 of 1998, 24 years after the first operation, the Atomic Energy Commission of India and the Defence Research and Development Organisation (DRDO) carried out the joint operation, known as Pokhran-II. The AEC India detonated its four devices as part of the underground nuclear testing on Pokhran Test Range.

Correct Option: C

Pokhran is a city and a municipality located in Jaisalmer district in the Indian state of Rajasthan. It is a remote location in the Thar Desert region and served as the test site for India’s first underground nuclear weapon detonation. It shot into the international limelight on 7 September 1974 when the then Indian Prime Minister Indira Gandhi verbally authorized scientists at the Bhabha Atomic Research Centre (BARC) at Trombay to detonate small and miniaturized nuclear device. Throughout its development, the device was formally called the “Peaceful Nuclear Explosive (PNE)” by Indian Government, but it was usually referred to as the Operation Smiling Buddha. On May 11 of 1998, 24 years after the first operation, the Atomic Energy Commission of India and the Defence Research and Development Organisation (DRDO) carried out the joint operation, known as Pokhran-II. The AEC India detonated its four devices as part of the underground nuclear testing on Pokhran Test Range.