Space – MCQ – GK Questions

Q: The Copernicus Sentinel satellites are operated by which organization?

ESA/EUMETSAT – Sentinel constellation provides free/open Earth observation data for environmental monitoring, managed jointly by ESA and EUMETSAT under EU Copernicus program.

Q: Gamma-ray bursts (GRBs) are classified into short and long duration based on which threshold?

2 seconds – Short GRBs ( 2 s) from collapsars/massive star deaths, differing in progenitors and host galaxies.

Q: Titan's atmosphere is predominantly composed of which gas?

Nitrogen – Titan's dense atmosphere is ~95% nitrogen with ~5% methane, resembling early Earth's composition but at cryogenic temperatures.

Q: Which Apollo mission carried the first lunar rover?

Apollo 15 – Apollo 15 (July-Aug 1971) deployed the first Lunar Roving Vehicle, extending exploration range beyond walking distance and collecting diverse samples.

Q: Voyager 1 crossed the heliopause into interstellar space in which year?

2012 – Voyager 1 crossed the heliopause on Aug 25, 2012, becoming the first human-made object to enter interstellar space, confirmed by plasma density jump.

Q: Shepherd moons maintain planetary ring gaps through which mechanism?

Gravitational resonances – Small moons like Prometheus and Pandora gravitationally confine Saturn's F ring, preventing particle dispersion through orbital resonances.

Q: Radioisotope Thermoelectric Generators (RTGs) convert heat from radioactive decay into electricity using which principle?

Seebeck effect – RTGs use thermocouples exploiting the Seebeck effect to generate electricity from temperature difference between hot Pu-238 fuel and cold space environment.

Q: Adaptive optics in ground-based telescopes corrects atmospheric distortion using which component?

Deformable mirrors – Deformable mirrors adjust shape hundreds of times per second based on wavefront sensor data, compensating for atmospheric turbulence in real-time.

Q: Who was the first person to orbit Earth more than once?

Gherman Titov – Titov orbited Earth 17 times aboard Vostok 2 in Aug 1961, spending over 25 hours in space, surpassing Gagarin's single orbit.

Q: Ka-band frequencies (26-40 GHz) are increasingly used in satellite communications for which advantage?

Higher bandwidth capacity – Ka-band offers wider bandwidths enabling high-throughput broadband services, though susceptible to rain fade requiring adaptive coding/modulation.