Tag: artificial satellites

Questions Related to 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)

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  1. $\dfrac {GMm}{8R}$

  2. $\dfrac {2GMm}{3R}$

  3. $\dfrac {GMm}{4R}$

  4. $\dfrac {GMm}{6R}$

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Correct Option: A

When energy of a satellite-planet system is positive then satellite will :

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  1. Move around planet in circular orbit

  2. Move around planet in elliptical orbit

  3. Escape out with minimum speed

  4. Escape out with speed greater than escape velocity

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Correct Option: A

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

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

  1. True

  2. False

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Correct Option: A
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.

Transponder is a device in satellites to: 

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  1. correct the orbit of satellite

  2. photograph features of the Earth

  3. receive and broadcast audio and video signals

  4. spy on criminals

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Correct Option: C
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.

The first satellite to put into space by India is:

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  1. INSAT

  2. Aryabhatta

  3. Rohini

  4. Bhaskara

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Correct Option: B
Explanation:

Aryabhatta
The first satellite by ISRO into the space was Aryabhatta launched on April 19, 1975.

The process of acquiring information about an object or phenomenon without making actual physical contact within, as opposed to onsite observation is called :
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

  1. Remote Sensing

  2. Actuation

  3. Transducing

  4. None of the above

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Correct Option: A
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.

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

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  1. $Constellation$

  2. $Satellites$

  3. $Sun$

  4. None of these

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Correct Option: B

The planet having the largest number of satellites amongst the following is

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  1. Jupiter

  2. Saturn

  3. Uranus

  4. Mars

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Correct Option: A
Explanation:

Jupiter is having largest no. of satellites.

The first Indian built rocket was launched from:

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  1. Bangalore

  2. Sriharikota

  3. Thumba

  4. Trivandrum

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Correct Option: C
Explanation:

The first Indian built rocket was launched from Thumba on the outskirts of thiruvananthpuram on November 21 1963.

Which among the following is the greatest achievement of Chandrayaan?

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  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

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Correct Option: A
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.