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 gives weight \(W\) near Earth's surface?
  1. \(W = mg\)
  2. \(W = m + g\)
  3. \(W = \frac{m}{g}\)
  4. \(W = mg^2\)

Question 2

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

Question 3

If an astronaut has mass \(70\,\mathrm{kg}\) on Earth, what is the weight on the Moon where \(g\) is \(1.6\,\mathrm{N/kg}\)?
  1. \(112\,\mathrm{N}\)
  2. \(700\,\mathrm{N}\)
  3. \(1120\,\mathrm{N}\)
  4. \(16\,\mathrm{N}\)

Question 4

Why do satellites stay in orbit around Earth?
  1. Gravity provides the central force to bend their path
  2. They are held by magnetic strings
  3. They orbit because they are lighter than air
  4. They fly on engine thrust alone

Question 5

What causes the seasons on Earth?
  1. The tilt of Earth’s axis as it orbits the Sun
  2. The distance from the Moon
  3. Tidal forces alone
  4. Solar flares changing color

Question 6

When it is summer in the northern hemisphere, what happens in the southern hemisphere?
  1. It is winter there
  2. It is also summer
  3. There are no seasons
  4. It is autumn

Question 7

Which unit is used to describe astronomical distances?
  1. Light year
  2. Metre per second
  3. Newton
  4. Watt

Question 8

How far does light travel in one year?
  1. \(9.46 \times 10^{15}\,\mathrm{m}\)
  2. \(3 \times 10^8\,\mathrm{m}\)
  3. \(9.46 \times 10^5\,\mathrm{m}\)
  4. \(1.5 \times 10^{10}\,\mathrm{m}\)

Question 9

What keeps planets moving around the Sun?
  1. A balance between their inertia and the Sun’s gravity
  2. The heat from the Sun
  3. Solar wind pushing them
  4. Magnetic links

Question 10

What is our Sun classified as?
  1. A star
  2. A planet
  3. An asteroid
  4. A comet

Question 11

Which force acts between two masses even when they are not touching?
  1. Gravity
  2. Friction
  3. Tension
  4. Elastic

Question 12

Which object experiences a greater weight on Earth?
  1. The object with more mass
  2. The object that is warmer
  3. The one moving faster
  4. The one that is shiny

Question 13

What does a planet’s gravitational field do?
  1. Exerts a force that attracts other objects
  2. Changes the object's color
  3. Creates sound waves
  4. Increases temperature only

Question 14

What is the main reason space telescopes orbit Earth?
  1. To avoid atmospheric distortion and get clear images
  2. To heat the atmosphere
  3. To balance the tides
  4. To slow down satellites

Question 15

Which layer protects Earth from most meteorites?
  1. Atmosphere
  2. Core
  3. Crust
  4. Core mantle boundary

Question 16

Why do day and night occur?
  1. Because Earth rotates so different areas face the Sun
  2. Because the Sun turns off at night
  3. Because Moon blocks the Sun every \(24\,\mathrm{h}\)
  4. Because stars move around Earth

Question 17

Which tool uses distance-time data to show how long a journey takes?
  1. Graph
  2. Mirror
  3. Voltmeter
  4. Thermometer

Question 18

How does gravity between Earth and Moon affect tides?
  1. It pulls water toward the Moon creating bulges
  2. It pushes tides away instantly
  3. It changes their temperature
  4. It creates light flashes

Question 19

Which unit would you use to describe the distance between galaxies?
  1. Light year
  2. Metre per second
  3. Newton
  4. Celsius

Question 20

Why do we use the light year rather than metres for stars?
  1. Because distances are so huge that metres would be unwieldy
  2. Because stars only emit light at night
  3. Because the Sun demands it
  4. Because the Moon uses kilometres

Question 21

Why do astronauts feel weightless while orbiting Earth?
  1. They are constantly falling around Earth so there is no normal supporting force.
  2. Gravity disappears at that altitude.
  3. Their spacecraft cancels gravity with rockets.
  4. They are outside Earth's gravity field.

Question 22

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

Question 23

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 24

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 25

What keeps a satellite in orbit?
  1. Gravity providing a centripetal force
  2. Air resistance
  3. Magnetic force only
  4. Electrostatic force

Question 26

Why does a satellite not fall straight down?
  1. It has forward velocity so gravity bends its path
  2. Gravity is zero in space
  3. Its mass is negligible
  4. It is pushed outwards by wind

Question 27

Which unit is used for astronomical distances?
  1. Light year
  2. Metre
  3. Ampere
  4. Pascal

Question 28

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 29

What causes seasons on Earth?
  1. Tilt of Earth's axis as it orbits the Sun
  2. Changing distance from Sun
  3. Earth spins faster
  4. Moon's gravity

Question 30

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

Question 31

Which factor keeps the Moon in orbit around Earth?
  1. Gravitational attraction
  2. Wind
  3. Electric current
  4. Light pressure

Question 32

Which statement describes a star?
  1. Massive glowing ball of plasma producing energy by fusion
  2. Small solid rock
  3. Permanent magnet
  4. Gas giant with rings

Question 33

Why do we see different constellations in different seasons?
  1. Earth's orbit changes the night sky direction
  2. Stars move daily
  3. Constellations travel with Moon
  4. Sun blocks them always

Question 34

What is the common fate of most stars like the Sun?
  1. Become red giants then white dwarfs
  2. Explode as supernovas immediately
  3. Turn into black holes
  4. Freeze solid

Question 35

Why does the apparent brightness of a star fall with distance?
  1. Light spreads over larger area
  2. Star loses energy
  3. Distance changes color
  4. It moves faster

Question 36

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

Question 37

What is cosmic background radiation evidence for?
  1. Big Bang origin of the universe
  2. Solar energy
  3. Galaxy winds
  4. Static electricity

Question 38

What does the term 'light year' measure?
  1. Distance light travels in one year
  2. Year-long brightness
  3. Mass of a star
  4. Frequency of light

Question 39

Which unit is used to compare the brightness of stars?
  1. Magnitude
  2. Kelvin
  3. Tesla
  4. Watt

Question 40

Why does an astronaut feel weightless in orbit?
  1. Both astronaut and spacecraft are in free fall
  2. Gravity is absent
  3. They float since mass is zero
  4. Air supports them

Question 41

What happens to orbital period if orbital radius increases while speed remains constant?
  1. Period increases
  2. Period decreases
  3. No change
  4. Direction reverses

Question 42

Which law explains satellites orbiting due to gravity providing centripetal force?
  1. Newton’s law of universal gravitation
  2. Hooke’s law
  3. Boyle’s law
  4. Kepler’s first law

Question 43

Which object has the largest escape velocity?
  1. Neutron star
  2. Moon
  3. Earth
  4. Satellite

Question 44

Why do astronauts need quilted suits?
  1. To maintain body heat when not supported by air
  2. To conduct electricity
  3. To shield gamma only
  4. To float

Question 45

Why are probes sent to other planets?
  1. To gather data about conditions and test instruments
  2. To mine immediately
  3. To change tides
  4. To write radio songs

Question 46

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

Question 47

What causes the seasons on Earth?
  1. The tilt of Earth's axis changes the sunlight angle throughout the orbit.
  2. Earth is much closer to the Sun in summer than in winter.
  3. The length of each day doubles in summer.
  4. Solar flares become stronger in summer months.

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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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