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

Answer: (a)

CTBT is the universally accepted norm against nuclear testing has been respected by 183 countries since 1996.

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: (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.

Answer: (a)

A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometres (22,300 miles) directly over the equator, that revolves in the same direction the earth rotates (west to east).

At this altitude, one orbit takes 24 hours, the same length of time as the earth requires to rotate once on its axis. The term geostationary comes from the fact that such a satellite appears nearly stationary in the sky as seen by a ground-based observer.