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RAS question

Consider the following statements regarding the GISAT-1A (EOS-05) satellite: 1. It is a geo-imaging Earth observation satellite designed to operate from a geostationary orbit. 2. It weighs approximately 2,100 kilograms. 3. Geostationary positioning allows it to provide near-continuous observation of the Indian subcontinent for rapid disaster monitoring. Which of the statements given above are correct?

Correct answer: (D) 1, 2 and 3.

GISAT-1A (EOS-05) is a geo-imaging Earth observation satellite meant for geostationary-orbit operation, with an approximate mass of 2,100 kg and near-continuous observation capability useful for rapid disaster monitoring over the Indian subcontinent.

  1. (A)

    1 and 2 only

  2. (B)

    2 and 3 only

  3. (C)

    1 and 3 only

  4. (D)

    1, 2 and 3

Explanation

All three statements are correct. The ISRO annual report describes the GISAT class as Geo Imaging Satellites in geostationary orbit, intended to enable near-real-time imaging. For GISAT-1, it specifically notes a high-temporal-resolution geo-imaging satellite with multispectral and hyperspectral imaging, primarily meant for near-real-time imaging of natural resources and disaster management. The same official source gives its lift-off mass as 2100 kg and says the mission aims to provide fast revisit capability and real-time monitoring. Read with the question's framing of GISAT-1A (EOS-05), this supports statement 1 on geostationary geo-imaging, statement 2 on the approximately 2,100 kg mass, and statement 3 on why geostationary positioning matters for rapid disaster monitoring.

Why the other options are wrong

  • (A) Option A leaves out statement 3, although geostationary positioning is central to the satellite's near-real-time monitoring value for disaster management.
  • (B) Option B leaves out statement 1, even though the official description identifies GISAT as a geo-imaging satellite planned for geostationary orbit.
  • (C) Option C leaves out statement 2, but the ISRO source gives the satellite's lift-off mass as 2100 kg, matching the question's approximate figure.

Concept

This tests space-technology applications in Earth observation: orbit choice, payload purpose and disaster-management utility. RAS repeats such questions because ISRO missions link science-and-technology facts with governance uses such as natural-resource mapping and disaster response.

Source

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