space & satellite MCQ section 2 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Answer: (b)

Answer: (c)

Answer: (d)

An artificial satellite moving around the Earth in a circular orbit possesses an acceleration which is “constant” in magnitude but “changing in direction”.

An artificial satellite revolves round the earth under centripetal acceleration. By the launch rocket, immediately before the satellite is established in the predetermined orbit, the speed given to it is 30, 000 km/hr.

The speed must be great enough so gravity doesn’t bring the satellite back to Earth, but not so great that the satellite escapes gravity out into space.

This means that the speed, which is provided by the rocket is the source of the centrifugal force, and the attraction of the earth holds it from moving away from this centrifugal force.

Answer: (c)

Answer: (a)

Orbital tracking reports suggest Russia’s failed Mars probe, Phobos-Grunt, fell back to Earth on Sunday, to be destroyed over the Pacific. Yinghuo-1 was a Chinese Mars exploration space probe, intended to be the first Chinese spacecraft to explore Mars.

It was launched from Baikonur Cosmodrome, Kazakhstan, on 8 November 2011, along with the Russian Fobos-Grunt sample return spacecraft, which was intended to visit Mars’ moon Phobos.