Which of the following statement(s) is/are correct?
A. Only I
B. I and II
C. II and III
D. All of the above
Answer:D
Which of the following statement(s) is/are correct?
A. Only I B. I and II C. II and III D. All of the above
Explanation: Indian Space Research Organization (ISRO) on 28 April 2016 launched India’s seventh navigation satellite of the Indian Regional Navigation Satellite System (IRNSS 1G) into a Sub-Geosynchronous Transfer Orbit (Sub-GTO) on-board PSLV-C33. With this launch, India successfully joined the elite group of countries that have their own navigation system technology to cater to the mammoth navigational needs. A geostationary or geosynchronous orbit is one in which the satellite is always in the same position with respect to the rotating Earth. The satellite orbits at an elevation of approximately 35,790 km because that produces an orbital period (time for one orbit) equal to the period of rotation of the Earth (23 hrs, 56 mins, and 4.09 secs). Polar-orbiting satellites provide a more global view of Earth, circling at near-polar inclination (the angle between the equatorial plane and the satellite orbital plane -- a true polar orbit has an inclination of 90 degrees). Orbiting at an altitude of 700 to 800 km, these satellites cover best the parts of the world most difficult to cover in situ (on site).