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India's largest optical telescope, Devasthal Optical Telescope, is located in _______.
- Ladakh
- Uttarakhand
- Rajasthan
- Himachal Pradesh
Answer: Uttarakhand
The 3.6m DOT at Devasthal, Uttarakhand, operated by ARIES, is India's largest optical telescope, supporting exoplanet and transient astronomy.
Telemetry, Tracking, and Command (TT&C) stations use S-band for near-Earth and X-band for deep space missions.
- True
- False
Answer: True
S-band (2-4 GHz) handles LEO/GEO TT&C; X-band (7-8 GHz) provides higher data rates for deep space links with reduced interference.
ISRO's POEM platform repurposes which spent stage for microgravity experiments?
- PSLV fourth stage
- GSLV cryogenic stage
- LVM3 core stage
- SSLV terminal stage
Answer: PSLV fourth stage
PSLV Orbital Experimental Module (POEM) uses depleted PS4 stage as stabilized platform hosting payloads for weeks/months post-primary mission separation.
The Caloris Basin is a massive impact feature on which celestial body?
- Moon
- Mars
- Mercury
- Vesta
Answer: Mercury
Caloris Basin (~1,550 km diameter) formed from a giant impact early in Mercury's history, causing antipodal chaotic terrain from seismic focusing.
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.
Gamma-ray bursts (GRBs) are classified into short and long duration based on which threshold?
- 1 second
- 2 seconds
- 10 seconds
- 60 seconds
Answer: 2 seconds
Short GRBs (<2 s) originate from compact object mergers; long GRBs (>2 s) from collapsars/massive star deaths, differing in progenitors and host galaxies.
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.
Voyager 1 crossed the heliopause into interstellar space in which year?
- 2004
- 2012
- 2018
- 2021
Answer: 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.
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.