Railway Science (Science and Technology – Satellites)

Total Questions: 59

21. _____ is an experimental satellite that was launched for the first time by Indian Space Research Organisation (ISRO) in August 1979 from Satish Dhawan Centre. [RRB NTPC CBT - I (29/01/2021) Evening]

Correct Answer: (b) Rohini
Solution:

The Cartosat is a series of Indian optical earth observation satellites built and operated by the Indian Space Research Organisation (ISRO). Himawari 8 (Japanese Weather Satellite) has 16 observation bands, enabling closer monitoring of clouds. INSAT-3DR are used for relaying meteorological, hydrological, agro-meteorological and oceanographic data.

22. Name the geostationary communication satellite launched by ISRO on board GSLV launched vehicle and especially designed for the Indian Air Force to enhance its communication capabilities. [RRB NTPC CBT - I (03/02/2021) Morning]

Correct Answer: (b) GSAT-7A
Solution:

It is the 35th Indian Communication satellite. GSAT-7A Spacecraft is configured on ISRO's standard I-2000 Kg (I-2K) Bus. GSLV - MK III is capable of lifting 4t class satellites to GTO and about 10t to LEO. This is a 3 stage vehicle.

23. Which other two countries were at the top in the world to possess an anti satellite weapon system in 2010 when China became the third country? [RRB NTPC CBT - I (03/02/2021) Evening]

Correct Answer: (d) The USA and Russia
Solution:

Anti satellite weapon system (ASAT Missile) an interceptor missile that destroys or jams satellites in space. The United States of America (USA) tested Anti-Satellite Weapons in October 1959. On 27th March, 2019, India successfully conducted an Anti-Satellite (ASAT) missile test called Mission Shakti and became the 4ᵗʰ country to acquire such technology.

24. What is the name of the world’s smallest spacecraft launched by India? [RRB NTPC CBT - I (04/02/2021) Morning]

Correct Answer: (c) Sprites
Solution:

Sprites - A fully functional spacecraft, built on a single circuit board - achieved low Earth orbit, the 3.5 cm x 3.5 cm chips weigh a mere 4 grams and contain solar panels, computers, sensors, and radios.
It is created by the Breakthrough Starshot Program. GSAT-11 is the heaviest satellite built by Indian Space Research Organization (ISRO). LVM3 is ISRO’s heaviest rocket.

25. When was GSAT-6A launched and from where? [RRB NTPC CBT - I (04/02/2021) Evening]

Correct Answer: (b) 29 March 2018, Satish Dhawan Space Centre (Sriharikota)
Solution:

GSAT-6A - A communication satellite launched by the Indian Space Research Organisation (ISRO) from the GSLV - F08 rocket vehicle. It provides communication services through multibeam coverage. It was successfully placed in GTO (Geo-stationary Transfer Orbit).

26. A _______ satellite GSAT-12 was launched by PSLV-C17 from Sriharikota. [RRB NTPC CBT - I (05/02/2021) Morning]

Correct Answer: (c) communication
Solution:

Communication satellites is a wireless communication device in Earth's orbit that uses a transponder to send and receive data from Earth. Meteorological Satellite: Monitors Earth's weather and climate. Nano Satellite: Small satellite (mass less than 10 kg) used for various purposes.

27. What is ‘Bhuvan’ ? [RRB NTPC CBT - I (08/02/2021) Evening]

Correct Answer: (d) A geo- portal of ISRO with 3D imaging capabilities.
Solution:

Bhuvan (humongous software) is hosted by ISRO comprising Geo Spatial Data, Services and Tools for Analysis. It was launched on 12 August 2009. It has many features like: Visualization of Satellite Imagery and Maps analysis, free Data Download etc.

28. How many times does a GPS satellite circle the earth? [RRB NTPC CBT - I (09/02/2021) Evening]

Correct Answer: (d) Once every 12 hours
Solution:

GPS satellites fly in medium Earth orbit (MEO) at an altitude of approximately 20,200 km (12,550 miles). GPS stands for Global Positioning System. Powered by solar cells, the satellites in the GPS constellation are arranged into six equally spaced orbital planes surrounding the Earth.

29. In 2017, ISRO created a world record by launching ______ satellites on a single rocket from the Sriharikota spaceport in Andhra Pradesh. [RRB NTPC CBT - I (12/02/2021) Morning]

Correct Answer: (d) 104
Solution:

Indian Space Research Organisation (ISRO) Launched a World Record on PSLV C37 (ISRO's Polar Satellite Launch Vehicle).

30. Which of the following is dedicated as India’s first educational satellite? [RRB NTPC CBT - I (15/02/2021) Morning]

Correct Answer: (a) GSAT-3
Solution:

GSAT-3 (EDUSAT): Launched - 2004 by ISRO (Indian Space Research Organisation). Indian Satellites: Bhaskara-I (1979) - First experimental remote sensing satellite that carried TV and microwave cameras.
INSAT-4A (2005) - Advanced satellite for direct - to-home television broadcasting services. CartoSat-1 (2005) - Earth observation satellite. HAMSAT (2005) - Microsatellite for radio services to national and international community.