Tag: space research and satellites

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Questions Related to space research and satellites

Multiple choice physics search of life outside earth space research and satellites artificial satellites space missions and artificial satellites

A satellite of mass $m$ revolving around the earth in a circular orbit of radius $2R$ has to be shifted to another circular orbit of radius $4R$. The energy required for this process will be ($M\rightarrow$ mass of earth, $R\rightarrow$ radius of the earth)

  1. $\dfrac {GMm}{8R}$
  2. $\dfrac {2GMm}{3R}$
  3. $\dfrac {GMm}{4R}$
  4. $\dfrac {GMm}{6R}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The total energy of a satellite in an orbit of radius r is E = -GMm / (2r). The energy required to move from 2R to 4R is E2 - E1 = (-GMm / 8R) - (-GMm / 4R) = (-GMm + 2GMm) / 8R = GMm / 8R.

Multiple choice evs search of life outside earth space research and satellites artificial satellites space missions and artificial satellites

Remote imaging satellites are placed in geostationary orbit. This statement is

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A.
Geostationary satellites are positioned at an height above the Earth about $36,000\ km$. At this height, they rotate around the Earth at the same speed as the Earth rotates around its axis, so in effect remaining stationary above a point on the Earth (normally directly overhead the equator).
As they remain stationary, they are ideal for use as communications satellites and also for remote imaging as they can repeatedly scan the same points on the Earth beneath them.
Their great height is that they can view the whole Earth disk below them, rather than a small subsection, and they can scan the same area very frequently.
Hence, the statement is true.

Multiple choice evs space missions space research and satellites artificial satellites space missions and artificial satellites launching of an artificial satellites around the earth launching of satellite india’s space programmes

Transponder is a device in satellites to: 

  1. correct the orbit of satellite

  2. photograph features of the Earth

  3. receive and broadcast audio and video signals

  4. spy on criminals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To receive and broadcast audio and video signals
Transponders basically receive and transfer signals in satellite communication. Hence, it can be used to broadcast received audio and video signals.

Multiple choice evs space missions space research and satellites artificial satellites space missions and artificial satellites launching of an artificial satellites around the earth launching of satellite india’s space programmes
The process of acquiring information about an object or phenomenon without making actual physical contact within, as opposed to onsite observation is called :

  1. Remote Sensing

  2. Actuation

  3. Transducing

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Remote Sensing is the process of acquiring Information about an object or phenomenon without making actual physical contact within, as opposed to onsite observation.

This often requires the use of aerial sensor technologies.

Multiple choice evs space missions space research and satellites artificial satellites space missions and artificial satellites launching of an artificial satellites around the earth launching of satellite india’s space programmes

A celestial body that revolves around a planet is known as _____. 

  1. $Constellation$
  2. $Satellites$
  3. $Sun$

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A celestial body that revolves around a planet is defined as a satellite (natural or artificial).

Multiple choice physics search of life outside earth space research and satellites artificial satellites space missions and artificial satellites

Which among the following is the greatest achievement of Chandrayaan?

  1. the discovery of the widespread presence of water molecules in the lunar soil

  2. the discovery of the widespread presence of nitrogen molecules in the lunar soil
  3. the discovery of the widespread presence of $CO _2$ molecules in the lunar soil

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chandrayaan-1 was India's first lunar probe. It was launched by Indian Space Research Organisation (ISRO) in Ocyuber 2008 and operated until August 2009. The vehicle was successfully inserted into lunar orbit on 8 November, 2008. The greatest achievement of Chandrayaan is the discovery of the widespread presence of water molecules in the lunar soil.