space & satellite MCQ section 2 Practice Questions Answers Test with Solutions & More Shortcuts
space & satellite PRACTICE TEST [4 - EXERCISES]
space & satellite MCQ section 1
space & satellite MCQ section 2
space & satellite MCQ section 3
space & satellite MCQ section 4
Question : 16
Consider the following Statements:
- Port Blair Magnetic Observatory (PBMO) was inaugurated at Shoal Bay No. 8 in Port Blair,Andaman and Nicobar Islands on 30 March 2015.
- The observatory has been set up by the Indian Institute of Geomagnetism (IIG) under the Multi-Parametric Geophysical Observatories (MPGO).
- The IIG is located in Chennai.
a) 2 and 3 only
b) 1 and 3 only
c) 1 and 2 only
d) All of the above
Answer »Answer: (c)
The IIG is located in Mumbai.
Question : 18
The Phobos Grunt was:
- Mars probe mission of Russia.
- Carrying Yinghua-1, first Mars probe of China.
a) 1 and 2 both
b) 2 only
c) 1 only
d) None
Answer »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.
Question : 20
An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth
a) provides the necessary speed for its steady motion
b) is neutralized by the attraction of the moon
c) does not exist at such distance
d) provides the necessary acceleration for its motion
Answer »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.
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