Question
With reference to India's satellite launch vehicles, consider the following statements:
1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.
2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.
3. GSLV Mk III is a four-staged launch l vehicle with the first and third stages l using solid rocket motors; and the second and fourth stages using liquid rocket engines.
Which of the statements given above is/are correct.?
(a) 1 only
(b) 2 and 3
(c) 1 and 2
(d) 3 only
Answer:
A
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Explanation:
Statement 1 is correct. PSLVs (Polar Satellite Launch Vehicles) are primarily used for launching satellites for Earth resources monitoring, remote sensing, and scientific research. On the other hand, GSLVs (Geosynchronous Satellite Launch Vehicles) are designed mainly for launching communication satellites into geosynchronous orbits.
Statement 2 is incorrect. Satellites launched by PSLV do not appear to remain permanently fixed in the same position in the sky. Geostationary satellites, which are usually launched by GSLVs, appear to remain fixed in the same position as viewed from a particular location on Earth.
Statement 3 is incorrect. GSLV Mk III is a three-stage launch vehicle, not a four-staged one. It uses both solid and liquid rocket engines in its stages, with the first and second stages using solid rocket motors, and the third stage using a cryogenic engine.