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

Answer: (d)

In gel electrophoresis agarose extracted from sea weed used as gel agarose, made of 0.7% gel show good resolution of large DNA molecules and 2% gel will show good resolution of small fragments of DNA.

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: (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.

Answer: (b)

Smiling Buddha, formally designated as PokhranI, was the codename given to India's first nuclear test explosion that took place at the long-constructed Indian Army base, Pokhran Test Range in Rajasthan on 18 May 1974.

It was also the first confirmed nuclear test by a nation outside the five permanent members of the United Nations Security Council.