MCQ – GK Questions

NavIC operates with a network of 21 ranging and integrity monitoring stations across India for precise orbit determination and signal correction.

Main sequence stars fuse hydrogen into helium in their cores via the proton-proton chain or CNO cycle, releasing energy that counteracts gravitational collapse.

The Vikas engine, derived from France's Viking engine, uses hypergolic propellants: Unsymmetrical Dimethylhydrazine (UDMH) as fuel and Nitrogen Tetroxide (N2O4) as oxidizer.

LIGO made the first direct detection of gravitational waves (GW150914) on September 14, 2015, from merging black holes, confirming Einstein's prediction.

Edwin 'Buzz' Aldrin followed Neil Armstrong onto the lunar surface approximately 19 minutes after Armstrong during Apollo 11's EVA on July 20, 1969.

Oceansat satellites carry ocean color monitors and scatterometers for studying sea surface temperature, chlorophyll, wind vectors, and marine resources.

ISRO used a ballistic capture trajectory, arriving at Mars with minimal relative velocity, reducing fuel needed for orbit insertion compared to traditional methods.

Vega is a small-lift launch vehicle developed by ESA (primarily Italy and France) for launching small scientific and Earth observation satellites.

Neutron stars have densities of ~10^17 kg/m³. A cubic centimeter (teaspoon-sized) would weigh roughly a billion metric tons due to degenerate neutron matter.

NASA's OSIRIS-REx mission returned a capsule containing asteroid Bennu samples to Utah on September 24, 2023, for laboratory analysis.

Sun-synchronous orbits maintain constant illumination angles, ideal for consistent imaging conditions required by remote sensing and earth observation satellites.

The Local Group contains three large spiral galaxies: Milky Way, Andromeda (M31), and Triangulum (M33), plus dozens of dwarf galaxies.

Valles Marineris stretches over 4,000 km across Mars' equator, making it the largest canyon system in the solar system, dwarfing Earth's Grand Canyon.

BeiDou is China's global satellite navigation system, operational since 2020, providing positioning, navigation, and timing services worldwide.

The first crewed Gaganyaan mission plans to carry three Indian astronauts to a 400 km orbit for up to three days.

Comet C/2020 F3 (NEOWISE) became visible to the naked eye in July 2020, one of the brightest comets in decades, discovered by NASA's NEOWISE mission.

Stars with initial masses above ~20-25 solar masses typically end their lives as core-collapse supernovae, leaving behind black holes. Lower-mass stars become neutron stars or white dwarfs.

While initial discoveries came from ground-based TRAPPIST telescopes, NASA's Spitzer Space Telescope confirmed and characterized the seven-planet system in 2017.

GAGAN (GPS Aided GEO Augmented Navigation) enhances GPS accuracy for aviation and other applications over India using geostationary satellites.

Proxima Centauri is a red dwarf star located about 4.24 light-years from the Sun, making it the nearest known star to our solar system.