science & tech MCQ section 7 MCQ Questions & Answers Detailed Explanation

Answer: (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 vapour, 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.

Answer: (c)

The Soviet space probe Luna 3 of 1959 (of the E3 series) was the third space probe to be sent to the neighbourhood of the Moon, and this mission was an early feat in the spaceborne exploration of outer space.

Though it returned rather poor pictures by later standards, the historic, never-before-seen views of the far side of the Moon caused excitement and interest when they were published around the world, and a tentative Atlas of the Far Side of the Moon was created after image processing improved the pictures.

These views showed mountainous terrain, very different from the near side, and only two dark, low-lying regions which were named Mare Moscoviense (Sea of Moscow) and Mare Desiderii (Sea of Desire). Mare Desiderii was later found to be composed of a smaller mare, Mare Ingenii (Sea of Ingenuity), and several other dark craters.

Answer: (a)

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Established in 1969, ISRO superseded the erstwhile Indian National Committee for Space Research (INCOSPAR).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.

Answer: (d)

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.

Answer: (d)

Thirty-Metre Telescope is located in the Hawaii islands of the USA.

Answer: (a)

Stem cells are the undifferentiated mass of cells that can be appropriately programmed genetically to give rise to any type of cell. In view of this, it can be used for medical therapies like grafting, development of antibodies etc.