science & tech MCQ section 6 MCQ Questions & Answers Detailed Explanation

Answer: (d)

The orbit of a planet around the Sun is an ellipse, with the Sun in one of the focal points of the ellipse. [This focal point is actually the barycenter of the Sun planet system; for simplicity, this explanation assumes the Sun’s mass is infinitely larger than that planet’s.] Within a planetary system, planets, dwarf planets, asteroids (a.k.a. minor planets), comets, and space debris orbit the barycenter in elliptical orbits.

A comet in a parabolic or hyperbolic orbit about a barycenter is not gravitationally bound to the star and therefore is not considered part of the star’s planetary system. Bodies which are gravitationally bound to one of the planets in a planetary system, either natural or artificial satellites, follow orbits about a barycenter near that planet.

Galileo believed that the inertial path of a body around the Earth must be circular. Lacking the idea of Newtonian gravitation, he hoped this would allow him to explain the path of the planets as circular inertial orbits around the Sun.

When Newton solved this problem, he showed that there are four possible paths for the planets: circular, elliptical, parabolic and hyperbolic (all are conic curves). The first two curves are closed and the other two are open curves. These results were obtained for the same energy and with the sun at rest.

Answer: (b)

RTS,S, world’s first malaria vaccine would be launched by 2015 by GSK.

Answer: (c)

Golden rice is genetically modified rice. It contains Beta carotene and other carotenoids. Provitamin A (Beta carotene) upon ingestion is converted to Vitamin A in the body.

Answer: (c)

Timber is a renewable resource, like plantation forests, which are planted and then cut down to make paper. It is sometimes called a sustainable resource, so long as we keep planting and growing trees at the same rate as we cut them down. Fossil fuels such as coal, petroleum, and natural gas are non-renewable resources.

Answer: (d)

ARussian Capsule Bion-M craft that was filled with 45 mice and 15 newts along with other animals returned from a month’s long mission in Orbit on 19 May 2013.

Answer: (b)

Swine flu/influenza is caused by virus. There are several types of swine influenza such as influenza C and influenza A (includes H1N1, H1N2, H2N1, H3N1, H3N2, and H2N3). Malaria is caused by protozoa, plasmodium.