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Grade 6 Science Semester 2 Test
  • 1. The distance between two corresponding parts of a wave, such as the distance between two crests is called
A) spectrum.
B) wavelength.
C) visible light.
D) radiation.
  • 2. Day and night are caused by
A) Earth’s rotation on its axis.
B) Earth’s revolution around the sun.
C) the tilt of Earth’s axis.
D) eclipses.
  • 3. The blue-white hot core of a star that is left behind after its outer layers have expanded and drifted into space is known as a
A) supernova.
B) red giant.
C) white dwarf.
D) quasar.
  • 4. Earth has seasons because
A) it rotates on its axis.
B) its axis is tilted as it moves around the sun.
C) the distance between Earth and the sun changes.
D) the temperature of the sun changes.
  • 5. For a solar eclipse to occur,
A) the moon must be directly behind Earth.
B) the sun must be directly between Earth and the moon.
C) the moon must be directly between Earth and the sun.
D) Earth must be directly between the sun and the moon.
  • 6. A light-year is
A) 365 days.
B) the distance light travels in a year.
C) the distance from Earth to Proxima Centauri.
D) the amount of light the sun produces in a year.
  • 7. The four terrestrial planets all have
A) hot temperatures
B) deep atmospheres
C) rocky surfaces
D) large size
  • 8. A supernova is the explosion of a dying
A) medium-mass star.
B) protostar.
C) low-mass star.
D) high-mass star.
  • 9. A star is born when
A) nuclear fusion starts.
B) a protostar cools.
C) helium and oxygen combine.
D) a nebula expands.
  • 10. Characteristics used to classify stars include
A) size, brightness, and temperature.
B) color, brightness, and distance.
C) distance, size, and color.
D) size, distance, and brightness.
  • 11. The scientist who first used the telescope to make discoveries that supported the heliocentric model was
A) Brahe.
B) Ptolemy.
C) Copernicus.
D) Galileo.
  • 12. The two factors that combine to keep Earth and the moon in their orbits are
A) gravity and orbital speed.
B) gravity and inertia.
C) orbital speed and mass.
D) mass and inertia.
  • 13. A stream of particles that extends outwards from the sun’s corona is called
A) a prominence.
B) the solar wind.
C) the chromosphere
D) a sunspot.
  • 14. All objects are attracted to each other by the force of
A) weight.
B) inertia.
C) gravity.
D) mass.
  • 15. Venus’s surface temperature is so hot because of
A) wind.
B) the greenhouse effect.
C) air pressure.
D) gravity.
  • 16. A(n) _______________ is a loose collection of ice, dust, and small rocky particles that typically has a long, narrow orbit.
A) asteroid
B) meteoroid
C) planet
D) comet
  • 17. The Sun produces energy in a process known as nuclear ____________.
A) fusion
B) fission
C) resonance
D) radiation
  • 18. A year on a planet is based on its ____________ around the sun.
A) rotation
B) revolution
C) distance
  • 19. The ____________of the moon depend on how much of the lighted side of the moon can be seen from Earth.
A) phases
B) pieces
C) chunks
D) crust
  • 20. Astronomers typically measure distances to stars in units called _____________.
A) astronomical units
B) meters
C) kilometers
D) light years
  • 21. Stars with less mass will last ________ stars with more mass.
A) longer than
B) less time than
C) the same time as
  • 22. Radio waves have _________ wavelengths than waves of visible light.
A) shorter
B) longer
C) the same
  • 23. The Milky Way is an __________ galaxy
A) spiral
B) irregular
C) quasar
D) elliptical
  • 24. The sun and moon seem to move across the sky each day because of Earth’s _______________.
A) tilt
B) orbit
C) rotation
D) revolution
  • 25. _____________ are areas of gas on the sun that are hotter than the rest of the sun and can release x-rays.
A) Solar flares
B) White spots
C) Solar bombs
D) Prominences
  • 26. Tides are caused by the force of ______________ from the sun and moon acting on Earth.
A) gravity
B) friction
C) air resistance
  • 27. According to the __________ the universe formed about 14 billion years ago.
A) Theory of Plate Tectonics
B) Universal Law of Gravitation
C) Law of Thermodynamics
D) Big Bang Theory
  • 28. __________ are areas of gas on the sun that are cooler than the gases around them.
A) Solar flares
B) Sunspots
C) Solar winds
D) Prominences
  • 29. The ______________ is a giant area of space that contains billions or maybe trillions of comets.
A) Kuiper Belt
B) Oort cloud
C) Asteroid Belt
D) Kuiper Cloud
  • 30. Scientists believe that Enceladus, one of Saturn’s moons, may have _____________ beneath its icy surface that might support life.
A) plate tectonics
B) volcanoes
C) a liquid salt water ocean
  • 31. Telescopes work by collecting and focusing different forms of ____________ radiation.
A) optical
B) electromagnetic
C) spectrum
D) wavelength
  • 32. This is a model of the solar system with Earth at its center.
A) Exocentric
B) Geocentric
C) Holocentric
D) Heliocentric
  • 33. One astronomical unit is equal to:
A) 150,000 km
B) 150,000,000 km
C) 150,000,000,000 km
D) 15,000 km
  • 34. _______________ are small, mostly rocky bodies, many of which are found in an area between Mars and Jupiter.
A) meteors
B) meteorites
C) comets
D) asteroids
  • 35. The sun accounts for roughly ____% of the entire mass of the solar system.
A) 12
B) 79
C) 99
D) 5
  • 36. For a lunar eclipse to occur,
A) the moon must be directly behind Earth.
B) the sun must be directly between Earth and the moon.
C) the moon must be directly between Earth and the sun.
D) Earth must be directly between the sun and the moon.
  • 37. Spring tides happen when
A) the moon, sun and Earth are at 90 degree angles and their gravity is not affected.
B) the moon, sun and Earth are in a line and gravity is not affected.
C) the moon, sun and Earth are at 90 degree angles and their gravity works together
D) the moon, sun and Earth are in a line and their gravity works together
  • 38. Pathfinder and Perseverance landed on
A) Venus
B) Mercury
C) Mars
D) Titan
  • 39. Refracting telescopes use ________ and reflecting telescopes use_________ to bend and focus light.
A) mirrors, lenses
B) lenses, mirrors
C) photons, gluons
D) lasers, masers
  • 40. The probe ___________ studied Jupiter.
A) Cassini
B) Juno
C) New Horizons
D) Huygens
  • 41. The Cassini probe studied which planet?
A) Saturn
B) Mars
C) Mercury
D) Jupiter
  • 42. Why is Pluto not a planet?
A) It shares it's orbit with other Kuiper Belt objects.
B) it's too cold.
C) It's too far away.
D) It's too small.
  • 43. Nebula, protostar, main sequence, red giant, planetary nebula, white dwarf is the life cycle of what kind of star?
A) high mass
B) low mass
C) medium mass
  • 44. Nebula, protostar, main sequence, supernova, black hole (or neutron star) is the life cycle of what kind of star?
A) high mass
B) low mass
C) medium mass
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