UCA-5 Practice questions and answers
with solutions 2025
The Dawn spacecraft was able to visit 2 solar system objects because of its ion engines. Which
objects were these?
a.Our Moon and Mars.
b.Mercury and Venus.
c.Mars and Jupiter.
d.Vesta and Ceres.
e.Jupiter and Saturn. - ANSWER d.Vesta and Ceres.
Which spacecraft will never leave the solar system and venture into interstellar space?
a.Voyager 1.
b.Voyager 2.
c.Pioneer 10.
d.Pioneer 11.
e.Deep Space 1. - ANSWER e.Deep Space 1.
Have any spacecraft ever left the solar system?
a.yes, Pioneers 10 & 11 and Voyagers 1 & 2
b.yes, only Pioneers 10 & 11
c.no spacecraft have ever left the solar system
d.yes, only New Horizons that first visited Pluto
e.yes, only Voyagers 1 & 2 - ANSWER a.yes, Pioneers 10 & 11 and Voyagers 1 & 2
,Telecommunication satellites are most often located in which orbits?
a.MEO
b.HEO
c.GEO
d.GSO
e.Lunar - ANSWER c.GEO
Based upon the recent young galaxy observations of the James Webb Space Telescope, what is
an important conclusion that can be drawn?
a.Both young galaxies are located in the well developed Abell 2744 cluster.
b.Both young galaxies have appreciable spiral structure.
c.Both young galaxies have appreciable size and structure.
d.Both young galaxies have evidence of supernovae explosions
e.Both young galaxies have appreciable blue colouration and spherical shapes.. - ANSWER
c.Both young galaxies have appreciable size and structure.
Forward contamination:
a.occurs just after liftoff of a rocket as it passes through the lower Earth's atmosphere.
b.is when a spacecraft payload is integrated with the upper stage of the rocket.
c.refers to the possibility of contaminating other worlds with terrestrial organisms.
d.refers to the possibility of contaminating other Earth with alien organisms.
e.arises during fuel loading of a rocket, specifically the ozidizer. - ANSWER c.refers to the
possibility of contaminating other worlds with terrestrial organisms.
,Solar panels on a spacecraft
a.are usually very small in area especially when travelling in the outer solar system.
b.provide the electricity that powers the systems (computers, science instruments, etc.).
c.can only be used successfully when flying towards the Sun.
d.allow the RTGHS to operate efficiently.
e.create drag which allows the spacecraft to maneuver in space. - ANSWER b.provide the
electricity that powers the systems (computers, science instruments, etc.).
It is estimated that if a matter - anti-matter propulsion system could be created, it would take
how much "fuel" for a crewed mission to Mars?
a.10s of kilograms.
b.100s of kilograms.
c.None, solar photons are all that is needed.
d.A few grams
e.Millions of kilograms. - ANSWER d.A few grams
What is normally not a part of a rocket?
a.Wings.
b.Payload.
c.Engines.
d.Propellant.
e.Oxidizer. - ANSWER a.Wings.
, What number of passengers/crew is generally felt to be the minimum necessary for a successful
interstellar trip?
a.1,000 - 10, 000
b.1 - 10
c.10,000 - 100,000
d.10 - 100
e.100 - 1,000 - ANSWER e.100 - 1,000
What part of an ion engine can be changed to enhance (increase) the exhaust speed of the
ions?
a.The number of electrons in the exhaust stream.
b.The amount of oxidizer available.
c.The area of the engine nozzle.
d.The hollow cathode diameter.
e.The voltage of the discharge optics. - ANSWER e.The voltage of the discharge optics
Combustion is a(n)
a.Matter - anti-matter process.
b.Chemical process.
c.Component of solar propulsion.
d.Atomic fission process.
e.Ion exchange process. - ANSWER b.Chemical process.
For a liquid fuel propulsion system, what is typically needed?
with solutions 2025
The Dawn spacecraft was able to visit 2 solar system objects because of its ion engines. Which
objects were these?
a.Our Moon and Mars.
b.Mercury and Venus.
c.Mars and Jupiter.
d.Vesta and Ceres.
e.Jupiter and Saturn. - ANSWER d.Vesta and Ceres.
Which spacecraft will never leave the solar system and venture into interstellar space?
a.Voyager 1.
b.Voyager 2.
c.Pioneer 10.
d.Pioneer 11.
e.Deep Space 1. - ANSWER e.Deep Space 1.
Have any spacecraft ever left the solar system?
a.yes, Pioneers 10 & 11 and Voyagers 1 & 2
b.yes, only Pioneers 10 & 11
c.no spacecraft have ever left the solar system
d.yes, only New Horizons that first visited Pluto
e.yes, only Voyagers 1 & 2 - ANSWER a.yes, Pioneers 10 & 11 and Voyagers 1 & 2
,Telecommunication satellites are most often located in which orbits?
a.MEO
b.HEO
c.GEO
d.GSO
e.Lunar - ANSWER c.GEO
Based upon the recent young galaxy observations of the James Webb Space Telescope, what is
an important conclusion that can be drawn?
a.Both young galaxies are located in the well developed Abell 2744 cluster.
b.Both young galaxies have appreciable spiral structure.
c.Both young galaxies have appreciable size and structure.
d.Both young galaxies have evidence of supernovae explosions
e.Both young galaxies have appreciable blue colouration and spherical shapes.. - ANSWER
c.Both young galaxies have appreciable size and structure.
Forward contamination:
a.occurs just after liftoff of a rocket as it passes through the lower Earth's atmosphere.
b.is when a spacecraft payload is integrated with the upper stage of the rocket.
c.refers to the possibility of contaminating other worlds with terrestrial organisms.
d.refers to the possibility of contaminating other Earth with alien organisms.
e.arises during fuel loading of a rocket, specifically the ozidizer. - ANSWER c.refers to the
possibility of contaminating other worlds with terrestrial organisms.
,Solar panels on a spacecraft
a.are usually very small in area especially when travelling in the outer solar system.
b.provide the electricity that powers the systems (computers, science instruments, etc.).
c.can only be used successfully when flying towards the Sun.
d.allow the RTGHS to operate efficiently.
e.create drag which allows the spacecraft to maneuver in space. - ANSWER b.provide the
electricity that powers the systems (computers, science instruments, etc.).
It is estimated that if a matter - anti-matter propulsion system could be created, it would take
how much "fuel" for a crewed mission to Mars?
a.10s of kilograms.
b.100s of kilograms.
c.None, solar photons are all that is needed.
d.A few grams
e.Millions of kilograms. - ANSWER d.A few grams
What is normally not a part of a rocket?
a.Wings.
b.Payload.
c.Engines.
d.Propellant.
e.Oxidizer. - ANSWER a.Wings.
, What number of passengers/crew is generally felt to be the minimum necessary for a successful
interstellar trip?
a.1,000 - 10, 000
b.1 - 10
c.10,000 - 100,000
d.10 - 100
e.100 - 1,000 - ANSWER e.100 - 1,000
What part of an ion engine can be changed to enhance (increase) the exhaust speed of the
ions?
a.The number of electrons in the exhaust stream.
b.The amount of oxidizer available.
c.The area of the engine nozzle.
d.The hollow cathode diameter.
e.The voltage of the discharge optics. - ANSWER e.The voltage of the discharge optics
Combustion is a(n)
a.Matter - anti-matter process.
b.Chemical process.
c.Component of solar propulsion.
d.Atomic fission process.
e.Ion exchange process. - ANSWER b.Chemical process.
For a liquid fuel propulsion system, what is typically needed?
