What is the primary purpose of the Small Satellite Launch Vehicle (SSLV)?
- On-demand launching
- Manned missions
- Deep space exploration
- Heavy cargo transport
Explanation: SSLV is designed for quick, cost-effective, 'on-demand' launches of small satellites into Low Earth Orbit with minimal infrastructure.
Which of these is the smallest launch vehicle currently operated by ISRO?
Explanation: The Small Satellite Launch Vehicle (SSLV) is currently the smallest in ISRO's operational fleet, designed for satellites up to 500kg.
What is the primary purpose of 'Staging' in rockets?
- Increasing safety
- Cooling the engine
- Shedding empty weight
- Reducing speed
Explanation: Staging allows the rocket to discard empty fuel tanks and heavy engines that are no longer needed, improving overall efficiency.
The 'Next Generation Launch Vehicle' (NGLV) currently under study by ISRO aims to use which fuel?
- Nuclear thermal
- Pure Hydrazine
- Solid HTPB
- Methalox
Explanation: NGLV is envisioned as a cost-effective, partially reusable vehicle using Methane and Liquid Oxygen (Methalox) as propellants.
Which component is used as the oxidizer in the indigenous cryogenic upper stage of GSLV?
- Nitric Acid
- Liquid Fluorine
- Liquid Nitrogen
- Liquid Oxygen
Explanation: Cryogenic engines use Liquid Oxygen (LOX) as the oxidizer and Liquid Hydrogen (LH2) as the fuel.
Which mission marked the first successful flight of an indigenous cryogenic engine (CE-7.5)?
- GSLV-F01
- GSLV-D5
- LVM3-X
- PSLV-C1
Explanation: GSLV-D5, launched in 2014, was the first successful mission to use the indigenous Cryogenic Upper Stage (CUS).
In a four-stage PSLV, which stages are liquid-fueled?
- Second and fourth
- Only the fourth
- All four stages
- First and third
Explanation: PSLV uses a unique alternate stage configuration: 1st (Solid), 2nd (Liquid), 3rd (Solid), and 4th (Liquid).
What is the 'Velocity Trimming Module' (VTM) in the SSLV?
- Liquid terminal stage
- First stage
- Cryogenic stage
- Safety escape system
Explanation: After the three solid stages, SSLV uses a liquid-fueled Velocity Trimming Module (VTM) to precisely inject satellites into orbit.
The 'POEM' (PSLV Orbital Experimental Module) utilizes which part of the rocket as a platform?
- First stage
- Heat shield
- Satellite adapter
- Spent fourth stage
Explanation: POEM uses the spent PS4 (fourth stage) of the PSLV as an orbital platform for performing scientific experiments in space.
Which of these is a major component of 'Space Debris' generated by launch vehicles?
- Spent upper stages
- Exhaust gases
- Solar panels
- Radioactive waste
Explanation: Discarded rocket stages and fragments from stage separations are significant contributors to orbital space debris.
In the context of launch vehicles, what does the term 'Scramjet' primarily utilize for combustion?
- Stored oxidizer
- Nuclear energy
- Atmospheric oxygen
- Solid propellant
Explanation: A Scramjet (Supersonic Combustion Ramjet) uses atmospheric oxygen as the oxidizer, reducing the weight of the vehicle by removing the need for an oxidizer tank.
What makes the 'Vikas' engine 'human-rated' for the Gaganyaan mission?
- Enhanced reliability
- Higher fuel capacity
- Carbon fiber body
- Lower thrust levels
Explanation: Human-rating involves rigorous testing and the addition of redundant systems to ensure the highest safety and reliability standards.
Which launch vehicle successfully deployed the Chandrayaan-3 mission?
- SSLV-D2
- GSLV-F12
- PSLV-C56
- LVM3-M4
Explanation: The LVM3-M4 vehicle successfully launched the Chandrayaan-3 spacecraft into its intended orbit in July 2023.
How many stages of the SSLV use solid propulsion?
- Zero stages
- Three stages
- Two stages
- One stage
Explanation: SSLV is a three-stage vehicle where all three primary stages use solid propellants.
Which of these is the most 'powerful' engine currently operational in the ISRO inventory?
Explanation: The CE-20 is India's most powerful cryogenic engine, delivering the high thrust needed for the upper stage of the LVM3.
What is the primary fuel used in the Vikas engine?
- UDMH
- Kerosene
- Liquid Hydrogen
- Paraffin wax
Explanation: The Vikas engine uses Unsymmetrical Dimethylhydrazine (UDMH) as fuel and Nitrogen Tetroxide (N2O4) as the oxidizer.
Which historical event proved India's entry into the 'Cryogenic Club'?
- Success of GSLV-D5
- ASLV launch
- Launch of SLV-3
- First PSLV flight
Explanation: The successful flight of GSLV-D5 with an indigenous cryogenic engine in 2014 made India the 6th nation to possess this technology.
Which launch vehicle has been selected for India’s first human spaceflight mission, Gaganyaan?
- LVM3
- SSLV
- PSLV-XL
- GSLV Mk II
Explanation: The LVM3 (Launch Vehicle Mark 3) is chosen for the Gaganyaan mission due to its high lift capability and proven stability.
Which launch vehicle was used for the launch of the XPoSat (X-ray Polarimeter Satellite)?
- LVM3
- PSLV-C58
- GSLV-MkII
- SSLV-D3
Explanation: XPoSat was launched by PSLV-C58 on January 1, 2024, into a Low Earth Orbit.
Which launch vehicle was used to carry India's first interplanetary mission, Mangalyaan?
- ASLV
- PSLV-C25
- GSLV Mk II
- LVM3
Explanation: The Mars Orbiter Mission (MOM) was launched using the PSLV-C25 in its XL configuration in 2013.
Which organization is developing a new spaceport at Kulasekharapatnam for SSLV?
- NewSpace India
- ISRO
- DRDO
- HAL
Explanation: ISRO is establishing a second launch site at Kulasekharapatnam, Tamil Nadu, specifically to facilitate SSLV launches toward the South Pole.
What is the function of the 'Crew Escape System' in a human-rated launch vehicle?
- Fuel tank venting
- Docking assistance
- Orbital correction
- Emergency stage separation
Explanation: The Crew Escape System (CES) is designed to pull the crew module away from the launch vehicle in case of an emergency during the ascent.
The 'HTPB' solid propellant is categorized as which type of fuel system?
- Hypergolic
- Cryogenic
- Composite propellant
- Monopropellant
Explanation: HTPB is a composite solid propellant consisting of fuel, oxidizer, and a binder mixed into a solid mass.
What is the main role of 'Gimbal control' in a launch vehicle engine?
- Satellite release
- Fuel ignition
- Thrust vector control
- Pressure regulation
Explanation: Gimbaling allows the engine nozzle to tilt, changing the direction of thrust to steer the rocket during flight.
Which ISRO facility is the primary site for the launch of all major satellite vehicles?
- VSSC Thiruvananthapuram
- SDSC Sriharikota
- NRSC Hyderabad
- ISTRAC Bengaluru
Explanation: The Satish Dhawan Space Centre (SDSC) in Sriharikota is India's primary spaceport for launching PSLV, GSLV, and LVM3 rockets.
What is the primary technical challenge associated with 'Cryogenic' engines?
- Low fuel efficiency
- Sub-zero storage
- High weight
- Solid state stability
Explanation: Cryogenic engines require fuels like Liquid Hydrogen and Liquid Oxygen, which must be stored at extremely low temperatures (-253°C and -183°C).
Which of these is a liquid propellant typically used in the fourth stage of the PSLV?
- LOX and Kerosene
- MON-3 and MMH
- Nitroglycerin
- Liquid Neon
Explanation: The PS4 stage uses Mono-Methyl Hydrazine (MMH) as fuel and Mixed Oxides of Nitrogen (MON-3) as the oxidizer.
Which trajectory is typically followed by a launch vehicle to reach orbit efficiently?
- Gravity turn
- Horizontal takeoff
- Spiral ascent
- Straight vertical
Explanation: A gravity turn uses Earth's gravity to tilt the rocket's path, minimizing the fuel needed to change direction and reach orbital velocity.
What is the payload capacity of LVM3 to Geostationary Transfer Orbit (GTO)?
- 2000 kg
- 8000 kg
- 4000 kg
- 1500 kg
Explanation: LVM3 is capable of placing heavy communication satellites weighing up to 4000 kg into GTO.
What is a 'Dual Satellite Adapter' used for?
- Launching two satellites
- Fuel transfer
- Signal amplification
- Structural reinforcement
Explanation: It is a hardware interface that allows a single launch vehicle to carry and deploy two separate satellites in one mission.
What does the 'X' in PSLV-XL stand for?
- Experimental
- Extended Length
- Extra Large
- Extreme Lift
Explanation: The 'XL' version of PSLV features extended strap-on boosters (PS0) to carry heavier payloads compared to the standard version.
Which propellant combination is commonly used in 'Hypergolic' liquid engines like the Vikas engine?
- LOX and LH2
- HTPB and Aluminium
- Kerosene and Oxygen
- UDMH and N2O4
Explanation: Hypergolic propellants ignite spontaneously upon contact. The Vikas engine uses UDMH (fuel) and Nitrogen Tetroxide (oxidizer).
Into which orbit does the PSLV typically deliver remote sensing satellites?
- Geostationary Orbit
- Sun-synchronous Orbit
- Transfer Orbit
- Medium Earth Orbit
Explanation: PSLV is primarily designed to launch Earth-observation or remote sensing satellites into Sun-synchronous Polar Orbits.
Which launch vehicle configuration is used specifically for India’s solar mission, Aditya-L1?
- GSLV-F10
- PSLV-XL
- SSLV-D1
- LVM3-M1
Explanation: Aditya-L1 was successfully launched into space by the PSLV-C57 in its 'XL' configuration.
What is the primary advantage of using a 'Scramjet' engine in the hypersonic regime?
- Underwater capability
- No moving parts
- Internal oxygen supply
- Zero carbon emission
Explanation: Scramjets lack the rotating compressors of traditional jet engines, relying on high speed to compress incoming air for combustion.
Which organization manages the commercial launches of ISRO's PSLV and SSLV?
- IN-SPACe
- DRDO
- NSIL
- Antrix Corporation
Explanation: NewSpace India Limited (NSIL) is the commercial arm of the Department of Space, tasked with managing commercial satellite launches.
Which engine is used in the third stage of the LVM3 (GSLV Mk III)?
Explanation: The LVM3 uses the powerful indigenous CE-20 cryogenic engine in its upper stage, whereas GSLV Mk II uses the CE-7.5.
The S200 boosters used in LVM3 contain which type of propellant?
- Solid propellant
- Hypergolic liquid
- Gaseous hydrogen
- Cryogenic liquid
Explanation: The S200 boosters are among the largest solid propellant boosters in the world, providing the massive initial thrust required for LVM3.
What is the specific name of the sounding rockets used by ISRO for upper atmospheric research?
- ASLV series
- Vyom series
- Rohini (RH) series
- Aryabhata series
Explanation: The Rohini (RH) series, such as RH-200 and RH-560, are sounding rockets used for probing the atmosphere and meteorological studies.
Which launch vehicle is colloquially known as the 'Workhorse of ISRO'?
Explanation: PSLV earned this title due to its high success rate and reliability in launching numerous Indian and foreign satellites.
What is the 'Payload Fraction' of a launch vehicle?
- Engine-to-stage ratio
- Cost-per-launch
- Payload-to-total mass
- Fuel-to-weight ratio
Explanation: It is the ratio of the mass of the payload to the total initial mass of the launch vehicle at liftoff.
How many stages are present in the Launch Vehicle Mark-3 (LVM3)?
- Two stages
- Five stages
- Three stages
- Four stages
Explanation: LVM3 is a three-stage heavy-lift launch vehicle consisting of two solid strap-on boosters, a liquid core stage, and a cryogenic upper stage.
In which direction does India usually launch its satellites from Sriharikota?
- Westward
- Eastward
- Southwestward
- Northward
Explanation: Launching eastward takes advantage of the Earth's rotational velocity (approx. 450 m/s at the equator), saving significant fuel.
Which propellant is used in the first stage of ISRO's Polar Satellite Launch Vehicle (PSLV)?
- Nitrogen Tetroxide
- Liquid Hydrogen
- Hydroxyl-terminated Polybutadiene
- Liquid Oxygen
Explanation: The first stage of PSLV (PS1) uses a solid propellant based on Hydroxyl-terminated Polybutadiene (HTPB).
In the context of launch vehicles, what does 'Max Q' represent?
- Maximum velocity
- Maximum fuel burn
- Maximum dynamic pressure
- Maximum altitude
Explanation: Max Q is the point where the vehicle experiences the maximum mechanical stress due to atmospheric resistance and speed.
The term 'Specific Impulse' (Isp) in rocketry measures what?
- Propellant efficiency
- Payload volume
- Rocket height
- Launch window
Explanation: Specific Impulse is a measure of how effectively a rocket engine converts propellant mass into thrust.
The 'Vikas' engine, used in the second stage of PSLV and GSLV, is based on which technology?
- Cryogenic engine
- Scramjet engine
- Viking engine
- Solid motor
Explanation: The Vikas engine is a liquid-fueled engine derived from the French Viking engine technology used in the Ariane rockets.
What is the primary role of the 'Heat Shield' or Payload Fairing in a launch vehicle?
- Communication relay
- Fuel storage
- Thrust vectoring
- Aerodynamic protection
Explanation: The heat shield protects the satellite from intense heat and pressure generated by atmospheric friction during the initial ascent.
Compared to GSLV Mk II, what is the major change in the LVM3 (GSLV Mk III) propulsion system?
- Solid strap-ons
- Nuclear upper stage
- No strap-ons
- Liquid strap-ons
Explanation: While GSLV Mk II uses four liquid strap-ons, LVM3 uses two massive S200 solid strap-on boosters.
Which orbit is located approximately 36,000 km above the Earth's equator?
- Low Earth Orbit
- Medium Earth Orbit
- Polar Orbit
- Geostationary Orbit
Explanation: Geostationary Orbit (GEO) is a circular orbit 35,786 km above the equator, where satellites appear stationary relative to Earth.
Which launch vehicle was the first to use strap-on boosters to augment its thrust?
Explanation: The Augmented Satellite Launch Vehicle (ASLV) introduced strap-on boosters to improve the payload capacity of the basic SLV-3 design.
What defines a 'Single-Stage-to-Orbit' (SSTO) vehicle?
- Solid fuel only
- Reusable first stage
- Air-breathing only
- No stage separation
Explanation: An SSTO vehicle reaches orbit from the Earth's surface without jettisoning any parts (stages) during the flight.
What is the primary benefit of a 'Semi-cryogenic' engine over a fully Cryogenic engine?
- Higher temperature storage
- No oxidizer needed
- Lower thrust
- More complex plumbing
Explanation: Semi-cryogenic engines use refined Kerosene, which is liquid at room temperature, making it easier to handle than Liquid Hydrogen.
What is the specific configuration of the stages in a PSLV rocket?
- All solid
- All liquid
- Solid-Liquid-Solid-Liquid
- Liquid-Solid-Liquid-Solid
Explanation: PSLV is the first Indian launch vehicle to use liquid stages; it alternates between solid and liquid fuel for its four stages.
In the GSLV Mk II, how many liquid strap-on boosters are used?
- Two boosters
- Four boosters
- Zero boosters
- Six boosters
Explanation: The GSLV Mk II uses four liquid strap-on boosters (L40) around its solid core first stage.
The RLV-TD (Reusable Launch Vehicle - Technology Demonstrator) acts as a testbed for which future vehicle?
- Sub-orbital tourism
- Single-stage-to-orbit
- Moon lander
- Two-stage-to-orbit
Explanation: RLV-TD is a series of experiments intended to develop technologies for a fully reusable Two-Stage-To-Orbit (TSTO) launch vehicle.
Why are liquid engines generally preferred over solid engines for upper stages?
- Lower cost
- Higher thrust
- Easier storage
- Restart capability
Explanation: Liquid engines can be shut down and restarted in space, allowing for precise orbital maneuvers, which solid motors cannot do.
Which historical ISRO launch vehicle was used to launch the Rohini satellite in 1980?
Explanation: The Satellite Launch Vehicle-3 (SLV-3) was India's first experimental launch vehicle, which successfully launched Rohini in 1980.
The SSLV-D2 mission successfully placed which type of satellites into orbit?
- Navigation satellites
- Lunar landers
- Mini and Micro-sats
- Heavy comm-sats
Explanation: SSLV-D2 successfully launched the EOS-07, Janus-1, and AzaadiSAT-2 satellites, which are all small-class satellites.
Which technology is essential for the 'Semi-cryogenic' engine currently being developed by ISRO?
- Liquid Nitrogen
- Liquid Ammonia
- Refined Kerosene
- Solid Rubber
Explanation: Semi-cryogenic engines use Liquid Oxygen as the oxidizer and refined Kerosene (Isrosene) as the fuel.