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Artificial satellites - class-VIII

Description: Artificial satellites
Number of Questions: 15
Created by:
Tags: physics search of life outside earth space travel universe and space stars and the solar system the sky our earth and the space evs universe space missions
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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. $\dfrac {GMm}{6R}$


Correct Option: A

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

  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


Correct Option: A

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

  1. True

  2. False


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: 

  1. correct the orbit of satellite

  2. photograph features of the Earth

  3. receive and broadcast audio and video signals

  4. spy on criminals


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:

  1. INSAT

  2. Aryabhatta

  3. Rohini

  4. Bhaskara


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 :
  1. Remote Sensing

  2. Actuation

  3. Transducing

  4. None of the above


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.

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

  1. Jupiter

  2. Saturn

  3. Uranus

  4. Mars


Correct Option: A
Explanation:

Jupiter is having largest no. of satellites.

The first Indian built rocket was launched from:

  1. Bangalore

  2. Sriharikota

  3. Thumba

  4. Trivandrum


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?

  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


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.

______________________is a CMOS camera, performed mineralogical mapping in the 400900 nm band with a spectral resolution of 15 nm and a spatial resolution of 80 m.

  1. HEX

  2. Hyper Spectral Imager

  3. Moon Impact Probe

  4. none of the above


Correct Option: B
Explanation:

The scientific payload in Chandrayaan contained 5 Indian Instruments and 6 instruments from other countries.

Hyper Spectral Imager (HY SI), one of the Indian instruments, is a CMOS camera that performed mineralogical mapping in the 400-900 nm band with a spectral resolution of 15 nm and a spatial resolution of 80 m.

Which of the following Indian instruments were used in chandrayaan?

  1. TMC

  2. LLRI

  3. HEX

  4. all of the above


Correct Option: D
Explanation:

The scientific payload in Chandrayaan contained 5 Indian instruments and 6 instruments from other countries.

The Indian instruments used in Chandrayaan were Terrain Mapping Camera (TMC), Hyper Spectral Imager (Hy SI), Lunar Laser Ranging Instrument (LLRI), High Energy aj/gamma X-ray Spectrometer (HEX) and Moon Impact Probe (MIP).

The specifications of chandrayaan include which of the following?

  1. 1380 Kg in mass.

  2. Cuboidal in shape

  3. Fuel and oxidiser were stored in two tanks of 390 litres each.

  4. all of the above


Correct Option: D
Explanation:

The mass of Chandrayaan was 1380 kg at launch, 675 kg at lunar orbit and 523 kg after releasing the impactor. It was cuboidal in shape. The spacecraft used a bipropellant  integrating propulsion system to reach lunar orbit as well as its maintenance while operating the moon. The power plant consisted of one 440 N engine and eight 220 thrusters. Fuel and oxidiser were stored in two tanks of 390 litres each.

The Chandrayaan used a _______________ integrated propulsion system to reach lunar orbit as well as orbit and altitude maintenance while orbiting the Moon.

  1. tripropellent

  2. bipropellant

  3. two star sensors

  4. none of the above


Correct Option: B
Explanation:

 The Chandrayaan used a bipropellant  integrating propulsion system to reach lunar orbit as well as orbit and altitude maintenance while operating the Moon. The power plant consisted of one 440 N engine and eight 220 thrusters. Fuel and oxidiser were stored in two tanks of 390 litres each.

The Chandrayaan was mainly powered by its solar array, which included one solar panel covering a total area of 2.15 x 1.8 m generating 750 W of peak power, which was stored in a_____________ for use during eclipses.

  1. cadmium zinc battery

  2. lead ion battery

  3. 36 Ah lithium-ion battery

  4. none of the above


Correct Option: C
Explanation:

The Chandrayaan was mainly powered by its solar array, which included one solar panel covering a total area of 2.15 x 1.8 m generating 750 W of peak power, which was stored in a 36 Ah lithium-ion battery for use during eclipses.

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