Railway Science (Science and Technology – Satellites)

Total Questions: 59

41. Which of the following is INCORRECT in respect of a geostationary satellite? [RRB NTPC CBT - I (11/03/2021) Morning]

Correct Answer: (a) Many of these satellite orbits are also sun-synchronous
Solution:

Geostationary satellite: Satellite that appears to be located at a fixed point in space when viewed from the earth's surface. Sun-synchronous orbit {(SSO), Heliosynchronous orbit} is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same local mean solar time.

42. In which year had ISRO launched EDUSAT(GSAT-3), a satellite exclusively dedicated to the educational sector? [RRB NTPC CBT - I (12/03/2021) Evening]

Correct Answer: (b) 2004
Solution:

EDUSAT - The first dedicated "Educational Satellite" that provides the country with satellite based two way communication to class rooms for delivering educational materials.

43. Name the satellite launched by NASA to precisely track Earth’s Shrinking polar ice cover. [RRB NTPC CBT - I (13/03/2021) Evening]

Correct Answer: (c) ICESat-2
Solution:

ICESat-2 (short for Ice, Cloud and land Elevation Satellite), launched Sept. 15, 2018, uses lasers and a very precise detection instrument to measure the elevation of Earth's surface.

44. Global Positioning System (GPS) is a network of several satellites orbiting the Earth at an approximate altitude of: [RRB NTPC CBT - I (14/03/2021) Morning]

Correct Answer: (d) 20,000 km
Solution:

GPS satellites fly in medium Earth orbit (MEO). It is a satellite-based navigation system that provides users with their location, speed, and time. It was developed by the United States in the 1970s.
NavIC {Indian Regional Navigation Satellite System (IRNSS)}. It is designed with a constellation of 7 satellites and a network of ground stations operating 24 x 7.

45. X-band synthetic aperture radar has been used in which satellite? [RRB NTPC CBT - I (15/03/2021) Morning]

Correct Answer: (d) RISAT-2B
Solution:

RISAT-2B - Radar Imaging Satellite, and it is designed for Earth observation using synthetic aperture radar (SAR) technology. GSAT-12 - Communication satellite. INSAT-4B - Communication satellite. CARTOSAT-2B (Earth observation satellite) - Primarily used for cartographic applications and provides high-resolution imagery of the Earth's surface.

46. India's first satellite ______ was completely designed and fabricated in India. On 19 April 1975, it was launched by a Russian space launch vehicle named 'Kosmos-3M‘ from the site Kapustin Yar. [RRB NTPC CBT - I (19/03/2021) Morning]

Correct Answer: (b) Aryabhata
Solution:

It weighed 794 pounds (360 kg) and its objective was to explore conditions in Earth’s ionosphere, measure neutrons and gamma rays from the Sun, and perform investigations in X-ray astronomy.
List of Indian Satellites: Apple (1981) - First experimental communication satellite, Rohini RS-1 (1980) - India's first indigenous satellite launch was used for measuring the in-flight performance of the second experimental launch of SLV-3. Bhaskara Sega-I (1979) - India's first experimental remote sensing satellite carried TV and microwave cameras.

47. Which of the following statements is NOT true about the Indian National Satellites System (INSAT) ? [RRB NTPC CBT - I (19/03/2021) Morning]

Correct Answer: (a) They were initiated in 1979.
Solution:

National Satellites System (INSAT) - A series of multipurpose geostationary satellites launched by ISRO in 1983.

48. Which of the following satellites of India was renamed after Dr. Kalpana Chawla in February, 2003? [RRB NTPC CBT - I (21/03/2021) Morning]

Correct Answer: (d) METSAT—1
Solution:The satellite was the first launched by the PSLV-C4 into the Geostationary Orbit On February 5, 2003 it was renamed to Kalpana-1 by the Indian Prime Minister Atal Bihari Vajpayee in memory of Kalpana Chawala (NASA astronaut) who perished in the Space Shuttle Columbia disaster (2003). Wheeler Island was renamed as A.P.J. Abdul Kalam.

49. Which of the following satellites of ISRO is an experimental satellite? [RRB NTPC CBT - I (27/03/2021) Morning]

Correct Answer: (a) YOUTHSAT
Solution:

YOUTHSAT was launched on April 20, 2011. It is an India -Russia students joint mission intended to investigate the relationship between solar variability and thermosphere - Ionosphere changes. Launch vehicle : PSLV- C16.

50. Which of the following is an ‘Earth Observation Satellite’ ? [RRB NTPC CBT - I (03/04/2021) Morning]

Correct Answer: (a) SARAL
Solution:

The Satellite with ARGOS and ALTIKA (SARAL) is a joint Indo-French satellite mission for oceanographic studies. SARAL performs altimetric measurements designed to study ocean circulation and sea surface elevation. Orbit Type of INS-1A (Experimental satellite) : SSPO (Sun Synchronous Polar Orbit). The Ariane Passenger Payload Experiment (APPLE) was ISRO's first indigenous, experimental communication satellite.