Tag: search of life outside earth

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Questions Related to search of life outside earth

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 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.

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

______________________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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following Indian instruments were used in chandrayaan?

  1. TMC

  2. LLRI

  3. HEX

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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).

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

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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.