Tag: space missions

Questions Related to space missions

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

ENERGY OF AN ORBITING SATELLITE
In motion of an object under the gravitational influence of another object. Which of the following quantities is not conserved?

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  1. Angular momentum

  2. mass of an object

  3. Total mechanical energy

  4. Linear momentum

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Correct Option: D
Explanation:

While considering the motion of an object under the gravitational influence of another object, angular momentum and total mechanical energy are conserved.Linear momentum is not conserved

The minimum distance of a satellite from the centre of the earth is 3R, where R is the radius of 2GM What is the earth. The mass of earth is M. The maximum speed of the satellite is $\sqrt { \frac { 2 G M } { 3 R } }$ radius of curvature at the point of minimum distance?

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  1. 6 R

  2. 4 R

  3. 3 R

  4. $\frac { 9 R } { 2 }$

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Correct Option: A
Explanation:

$\begin{array}{l} F=\dfrac { { G\left( M \right) m } }{ { { { \left( { 3R } \right)  }^{ 2 } } } }  \ \Rightarrow a=\dfrac { { GM } }{ { 9{ R^{ 2 } } } }  \ \therefore \dfrac { { { V^{ 2 } } } }{ { R' } } =a \ \Rightarrow \dfrac { { 2GM } }{ { 3R.R' } } =\dfrac { { GM } }{ { 9{ R^{ 2 } } } }  \ \Rightarrow R'=6R \ Hence, \ option\, \, A\, \, is\, \, correct\, \, answer. \end{array}$