UPSC Prelims 2018 – Question 95

Here is Question No. 95 a part of our series on UPSC Prelims 2018

Q95. 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 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 only

(c) 1 and 2 only

(d) 3 only

Answer: A

• Statement 1 is correct: The GSLV is designed mainly to deliver the communication satellites to the highly elliptical Geosynchronous Transfer Orbit (GTO) whereas PSLVs launch satellites useful for Earth resources monitoring.
• Statement 2 is not correct: PSLV is designed mainly to deliver the “earth observation” or “Remote-sensing” satellites with lift-off mass of up to about 1750 Kg to Sun-Synchronous circular polar orbits of 600-900 Km altitude. Satellites launched by PSLV do not appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.
• Statement 3 is not correct: GSLV Mk 3 is a three-stage heavy lift launch vehicle developed by ISRO. The vehicle has two solid strap-one, a core liquid booster and a cryogenic upper stage

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