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The Human-Rated LVM3 variant for Gaganyaan includes additional _______ systems not present on standard LVM3.
- Communication
- Redundancy and safety
- Propulsion
- Navigation
Answer: Redundancy and safety
HLVM3 features triple-redundant avionics, enhanced fault detection, and crew escape integration, meeting stringent human-rating standards.
Molecular clouds are the coldest and densest regions of the interstellar medium where stars form.
- True
- False
Answer: True
Giant molecular clouds (10-20 K, 10²-10⁶ particles/cm³) shield molecules from UV radiation, enabling gravitational collapse and star formation.
The first successful docking of two spacecraft occurred between which vehicles?
- Gemini 8 & Agena
- Apollo 9 & LM
- Soyuz 4 & 5
- Vostok 3 & 4
Answer: Gemini 8 & Agena
Neil Armstrong and David Scott docked Gemini 8 with Agena Target Vehicle on Mar 16, 1966, achieving first orbital docking despite subsequent emergency undocking.
Which space agency operates the Gaofen series of high-resolution Earth observation satellites?
- NASA
- ESA
- CNSA
- Roscosmos
Answer: CNSA
Gaofen ('High Resolution') satellites form China's CHEOS system, providing sub-meter imagery for civilian/military applications since 2013.
Deployable solar arrays on modern satellites often use _______ hinges to minimize stowed volume.
- Rigid mechanical
- Shape-memory alloy
- Tape-spring
- Hydraulic
Answer: Tape-spring
Tape-spring hinges provide reliable deployment without motors/latches, reducing mass/volume for large solar arrays on GEO and deep space missions.
Ganymede is the only moon in the solar system known to have its own intrinsic magnetic field.
- True
- False
Answer: True
Ganymede possesses a dipole magnetic field generated by dynamo action in its liquid iron core, creating a mini-magnetosphere within Jupiter's magnetosphere.
The Copernicus Sentinel satellites are operated by which organization?
- NASA
- ESA/EUMETSAT
- JAXA
- NOAA
Answer: ESA/EUMETSAT
Sentinel constellation provides free/open Earth observation data for environmental monitoring, managed jointly by ESA and EUMETSAT under EU Copernicus program.
The National Centre for Space Applications and Informatics (NCSAI) is being established in _______.
- Bengaluru
- New Delhi
- Gandhinagar
- Chennai
Answer: Gandhinagar
NCSAI in Gandhinagar will integrate space applications with informatics for governance, disaster management, and resource planning.
Multi-layer insulation (MLI) blankets protect spacecraft from extreme temperature variations in vacuum.
- True
- False
Answer: True
MLI consists of reflective foil layers separated by spacers, minimizing radiative heat transfer and maintaining thermal stability in space environment.
Titan's atmosphere is predominantly composed of which gas?
- Carbon dioxide
- Nitrogen
- Methane
- Argon
Answer: Nitrogen
Titan's dense atmosphere is ~95% nitrogen with ~5% methane, resembling early Earth's composition but at cryogenic temperatures.
Which Apollo mission carried the first lunar rover?
- Apollo 11
- Apollo 14
- Apollo 15
- Apollo 17
Answer: Apollo 15
Apollo 15 (July-Aug 1971) deployed the first Lunar Roving Vehicle, extending exploration range beyond walking distance and collecting diverse samples.
The IRNSS-1A satellite was replaced by NVS-01 due to failure of its _______.
- Solar panels
- Rubidium atomic clocks
- Thrusters
- Transponders
Answer: Rubidium atomic clocks
All three Rubidium clocks on IRNSS-1A failed in 2016-17, degrading positioning accuracy; NVS-01 launched May 2023 with indigenous clocks as replacement.
Planetary nebulae are formed by supernova explosions of massive stars.
- True
- False
Answer: False
Planetary nebulae result from low-to-intermediate mass stars (1-8 solar masses) ejecting outer layers during AGB phase; supernovae involve massive stars >8 solar masses.
Shepherd moons maintain planetary ring gaps through which mechanism?
- Magnetic confinement
- Gravitational resonances
- Electrostatic forces
- Radiation pressure
Answer: Gravitational resonances
Small moons like Prometheus and Pandora gravitationally confine Saturn's F ring, preventing particle dispersion through orbital resonances.
The Vikram Sarabhai Space Centre (VSSC) is named after the founder of ISRO and is located in _______.
- Bengaluru
- Thiruvananthapuram
- Ahmedabad
- Sriharikota
Answer: Thiruvananthapuram
VSSC in Thiruvananthapuram is ISRO's lead center for launch vehicle development, honoring Dr. Vikram Sarabhai who established TERLS there in 1963.
Radioisotope Thermoelectric Generators (RTGs) convert heat from radioactive decay into electricity using which principle?
- Photovoltaic effect
- Seebeck effect
- Thermionic emission
- Piezoelectric effect
Answer: Seebeck effect
RTGs use thermocouples exploiting the Seebeck effect to generate electricity from temperature difference between hot Pu-238 fuel and cold space environment.
NASA's Ingenuity helicopter completed _______ flights on Mars before retiring in 2024.
- 10
- 32
- 72
- 100
Answer: 72
Ingenuity exceeded its planned 5 flights, completing 72 sorties over 3 years, proving powered flight feasibility in thin Martian atmosphere.
Makemake is brighter than Pluto in visible light.
- True
- False
Answer: False
Pluto has higher albedo (~0.5-0.7) than Makemake (~0.77 but smaller size); Pluto appears brighter due to larger diameter despite similar reflectivity.
Who was the first person to orbit Earth more than once?
- Yuri Gagarin
- Gherman Titov
- John Glenn
- Valentina Tereshkova
Answer: Gherman Titov
Titov orbited Earth 17 times aboard Vostok 2 in Aug 1961, spending over 25 hours in space, surpassing Gagarin's single orbit.
Ka-band frequencies (26-40 GHz) are increasingly used in satellite communications for which advantage?
- Lower rain fade
- Higher bandwidth capacity
- Longer wavelength penetration
- Reduced antenna size
Answer: Higher bandwidth capacity
Ka-band offers wider bandwidths enabling high-throughput broadband services, though susceptible to rain fade requiring adaptive coding/modulation.