Satellites — Set 3
Technology · उपग्रह · Questions 21–30 of 50
Which satellite was India's first dedicated multi-wavelength space observatory?
Correct Answer: C. Astrosat
Astrosat was launched in 2015 to study celestial sources in X-ray, optical, and UV spectral bands. It enables simultaneous observation of multiple cosmic phenomena. This project made India a member of an elite group of nations with space telescopes.
How many satellites are required at minimum to determine a precise 3D position on Earth using GPS?
Correct Answer: D. Four
Four satellites are needed to calculate latitude, longitude, altitude, and precise time. While three satellites can provide a 2D position, the fourth is necessary to resolve the time offset. This process is known as trilateration.
Which of the following is the largest artificial satellite currently orbiting Earth?
Correct Answer: A. International Space Station
The International Space Station (ISS) is a habitable artificial satellite and a laboratory. It is about the size of a football field and is visible from Earth with the naked eye. It has been continuously occupied by humans since November 2000.
What is the primary purpose of 'OceanSat' satellites?
Correct Answer: D. Studying ocean biological parameters
OceanSat is designed to study the physical and biological aspects of the ocean from space. It measures parameters like sea surface temperature, chlorophyll concentration, and wind vectors. This data is vital for fisheries and coastal management.
Which country developed the GLONASS navigation satellite system?
Correct Answer: C. Russia
GLONASS is Russia's version of the Global Positioning System. It provides a global navigation service and is often used alongside GPS in modern smartphones. The system reached full global coverage in 2011.
What happens to a satellite when its mission ends in Geostationary Orbit?
Correct Answer: A. It is moved to a 'Graveyard Orbit'
A graveyard orbit is a junk orbit located a few hundred kilometers above the functional geostationary belt. Satellites are moved there to prevent them from colliding with operational ones. This practice helps manage space traffic at high altitudes.
Which Indian satellite was the first to use an indigenous launch vehicle, SLV-3?
Correct Answer: C. Rohini (RS-1)
Rohini RS-1 was successfully launched from Sriharikota in 1980 using the SLV-3 rocket. This achievement made India the sixth nation to have its own satellite launching capability. It was primarily used to monitor the performance of the launch vehicle.
Which frequency band is most commonly used by modern satellite-based internet services like Starlink?
Correct Answer: D. Ku-band
The Ku-band (Kurz-under band) is widely used for high-speed satellite communications and direct-broadcast television. It offers higher bandwidth than lower frequency bands but is more susceptible to rain fade. Most modern consumer satellite dishes operate in this range.
What is a 'Nanosatellite' typically defined as?
Correct Answer: D. A satellite weighing between 1 kg and 10 kg
Nanosatellites are part of the small satellite category, often built in the 'CubeSat' format. They are cost-effective and allow universities and small countries to participate in space research. Their small size allows multiple units to be launched on a single rocket.
Which satellite provided the first-ever close-up images of Mars for India?
Correct Answer: D. Mars Orbiter Mission (Mangalyaan)
The Mars Orbiter Mission, or Mangalyaan, was India's first interplanetary mission launched in 2013. It successfully entered Mars' orbit in its first attempt, a record-breaking feat. The satellite carried the Mars Colour Camera to study the Martian surface and atmosphere.