Space Physics questions

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Space Physics question collection

Review Space Physics questions for Physics, with correct answers shown and coverage across Solar System objects; orbits and gravity; life cycles of stars.

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Question 1

Which equation defines weight?
  1. \(W = mg\)
  2. \(W = m / g\)
  3. \(W = m + g\)
  4. \(W = m g^2\)

Question 2

What is the approximate value of gravitational field strength \(g\) near Earth?
  1. \(10\,\mathrm{N/kg}\)
  2. \(5\,\mathrm{N/kg}\)
  3. \(100\,\mathrm{N/kg}\)
  4. \(0.1\,\mathrm{N/kg}\)

Question 3

Which equation links orbital speed \(v\), radius \(r\), and orbital period \(T\)?
  1. \(v = \frac{2\pi r}{T}\)
  2. \(v = 2\pi r T\)
  3. \(v = \frac{T}{2\pi r}\)
  4. \(v = \frac{r}{2\pi T}\)

Question 4

What keeps a satellite in orbit?
  1. Gravity
  2. Air resistance
  3. Earth's magnetism
  4. Electrostatic attraction

Question 5

Why does a satellite follow a curved orbit instead of falling straight down?
  1. Forward velocity combines with gravitational acceleration
  2. Outward velocity combines with air resistance
  3. Forward acceleration combines with magnetic attraction
  4. Upward velocity combines with electrostatic repulsion

Question 6

Which unit is suitable for distances between stars?
  1. Light year
  2. Kilometre
  3. Astronomical unit
  4. Nanometre

Question 7

Convert \(4\,\mathrm{years}\) into seconds (~\(3.15 \times 10^7\,\mathrm{s}\) per year).
  1. \(1.26 \times 10^8\,\mathrm{s}\)
  2. \(3 \times 10^7\,\mathrm{s}\)
  3. \(4 \times 10^5\,\mathrm{s}\)
  4. \(1.26 \times 10^7\,\mathrm{s}\)

Question 8

What causes Earth's seasons?
  1. Its tilted axis during its orbit
  2. Its changing distance from the Sun
  3. Its changing rotation speed
  4. Its changing distance from the Moon

Question 9

When it is summer in the northern hemisphere, what season is it in the southern hemisphere?
  1. Winter
  2. Summer
  3. Spring
  4. Autumn

Question 10

What is the resultant force toward the centre of an orbit called?
  1. Centripetal force
  2. Centrifugal force
  3. Resistance force
  4. Reaction force

Question 11

Which statement describes a star?
  1. A massive ball of hot plasma that releases energy by fusion
  2. A rocky object orbiting a planet
  3. A planet made mostly of gas
  4. A cloud of ice and dust orbiting the Sun

Question 12

Why are different constellations visible in different seasons?
  1. Earth's orbit changes the night-time viewing direction
  2. Earth's rotation changes the stars each season
  3. The Moon carries constellations across the sky
  4. The constellations orbit Earth once a year

Question 13

Which main-sequence star is most likely to end in a supernova?
  1. Much more massive than the Sun
  2. The same mass as the Sun
  3. Much less massive than the Sun
  4. Not yet undergoing hydrogen fusion

Question 14

Why is a main-sequence star stable?
  1. Fusion's outward effect balances gravity
  2. Gravity has stopped acting
  3. The star has used all its hydrogen
  4. Its temperature has fallen to absolute zero

Question 15

Which term describes how fast stars move away from Earth (redshift)?
  1. Recessional velocity
  2. Orbital speed
  3. Escape velocity
  4. Spin velocity

Question 16

What does cosmic microwave background radiation support?
  1. A hot, dense beginning to the universe
  2. A cold, static beginning to the universe
  3. A universe formed around the Milky Way
  4. A universe whose expansion has stopped

Question 17

Light travels at \(3.0 \times 10^8\,\mathrm{m/s}\). How far does it travel in \(500\,\mathrm{s}\)?
  1. \(1.5 \times 10^{11}\,\mathrm{m}\)
  2. \(6.0 \times 10^5\,\mathrm{m}\)
  3. \(1.5 \times 10^8\,\mathrm{m}\)
  4. \(1.5 \times 10^{14}\,\mathrm{m}\)

Question 18

Where are elements heavier than iron formed?
  1. In supernovae
  2. In stable main-sequence stars
  3. In planets before stars form
  4. In cooling white dwarfs

Question 19

Why do astronauts feel weightless while orbiting Earth?
  1. They and their spacecraft are in free fall
  2. They are beyond Earth's gravitational field
  3. Their mass is converted into orbital energy
  4. Their spacecraft produces an upward force

Question 20

What happens to orbital period if orbital radius increases while speed remains constant?
  1. It increases
  2. It decreases
  3. It stays the same
  4. It reverses direction

Question 21

What pulls gas and dust together to form a protostar?
  1. Gravity
  2. Magnetic repulsion
  3. Radiation pressure
  4. Nuclear fission

Question 22

What happens to velocity during a circular orbit at constant speed?
  1. Its direction continually changes
  2. Its direction stays constant
  3. Its magnitude continually increases
  4. It becomes zero once per orbit

Question 23

What is the purpose of thermal insulation in a space suit?
  1. To limit heat gain and heat loss
  2. To reduce the astronaut's mass
  3. To weaken the local gravitational field
  4. To provide thrust during a spacewalk

Question 24

What is the main purpose of a planetary probe?
  1. Collect scientific data
  2. Carry astronauts between planets
  3. Relay communications around Earth
  4. Deflect a planet's orbit

Question 25

Which object is a dwarf planet?
  1. Pluto
  2. Earth
  3. Sun
  4. Venus

Question 26

Which stage will the Sun enter after its main-sequence stage?
  1. Red giant
  2. Neutron star
  3. Supernova
  4. Black hole

Question 27

What does redshift in a distant galaxy's spectrum indicate?
  1. Moving away
  2. Moving toward us
  3. Remaining stationary
  4. Orbiting the Sun

Question 28

Which observation supports an expanding universe?
  1. More distant galaxies have greater redshifts
  2. More distant galaxies have smaller redshifts
  3. All galaxies have the same redshift
  4. Nearby galaxies have no spectral lines

Question 29

Which process involving hydrogen powers a main-sequence star?
  1. Nuclear fusion
  2. Nuclear fission
  3. Chemical combustion
  4. Radioactive decay

Question 30

If a stellar core is massive enough after a supernova, what can it form?
  1. A black hole
  2. A white dwarf
  3. A main-sequence star
  4. A rocky planet

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Review Space Physics questions for Physics, with correct answers shown and coverage across Solar System objects; orbits and gravity; life cycles of stars.

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