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) radiation.
C) wavelength.
D) visible light.

2. Day and night are caused by

A) eclipses.
B) Earth’s revolution around the sun.
C) the tilt of Earth’s axis.
D) Earth’s rotation on its axis.

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) quasar.
B) white dwarf.
C) red giant.
D) supernova.

4. Earth has seasons because

A) it rotates on its axis.
B) its axis is tilted as it moves around the sun.
C) the temperature of the sun changes.
D) the distance between Earth and the sun changes.

5. For a solar eclipse to occur,

A) the sun must be directly between Earth and the moon.
B) the moon must be directly between Earth and the sun.
C) Earth must be directly between the sun and the moon.
D) the moon must be directly behind Earth.

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) high-mass star.
D) low-mass star.

9. A star is born when

A) helium and oxygen combine.
B) nuclear fusion starts.
C) a nebula expands.
D) a protostar cools.

10. Characteristics used to classify stars include

A) distance, size, and color.
B) size, brightness, and temperature.
C) size, distance, and brightness.
D) color, brightness, and distance.

11. The scientist who first used the telescope to make discoveries that supported the heliocentric model was

A) Copernicus.
B) Galileo.
C) Brahe.
D) Ptolemy.

12. The two factors that combine to keep Earth and the moon in their orbits are

A) orbital speed and mass.
B) gravity and inertia.
C) gravity and orbital speed.
D) mass and inertia.

13. A stream of particles that extends outwards from the sun’s corona is called

A) a sunspot.
B) the solar wind.
C) the chromosphere
D) a prominence.

14. All objects are attracted to each other by the force of

A) gravity.
B) mass.
C) weight.
D) inertia.

15. Venus’s surface temperature is so hot because of

A) the greenhouse effect.
B) air pressure.
C) wind.
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) radiation
C) fission
D) resonance

18. A year on a planet is based on its ____________ around the sun.

A) revolution
B) rotation
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) less time than
B) the same time as
C) longer than

22. Radio waves have _________ wavelengths than waves of visible light.

A) longer
B) the same
C) shorter

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) revolution
B) orbit
C) tilt
D) rotation

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) Prominences
D) Solar bombs

26. Tides are caused by the force of ______________ from the sun and moon acting on Earth.

A) friction
B) gravity
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) Prominences
B) Sunspots
C) Solar flares
D) Solar winds

29. The ______________ is a giant area of space that contains billions or maybe trillions of comets.

A) Asteroid Belt
B) Kuiper Belt
C) Kuiper Cloud
D) Oort cloud

30. Scientists believe that Enceladus, one of Saturn’s moons, may have _____________ beneath its icy surface that might support life.

A) a liquid salt water ocean
B) volcanoes
C) plate tectonics

31. Telescopes work by collecting and focusing different forms of ____________ radiation.

A) electromagnetic
B) spectrum
C) optical
D) wavelength

32. This is a model of the solar system with Earth at its center.

A) Holocentric
B) Exocentric
C) Heliocentric
D) Geocentric

33. One astronomical unit is equal to:

A) 150,000,000,000 km
B) 15,000 km
C) 150,000,000 km
D) 150,000 km

34. _______________ are small, mostly rocky bodies, many of which are found in an area between Mars and Jupiter.

A) asteroids
B) comets
C) meteors
D) meteorites

35. The sun accounts for roughly ____% of the entire mass of the solar system.

A) 12
B) 79
C) 5
D) 99

36. For a lunar eclipse to occur,

A) Earth must be directly between the sun and the moon.
B) the sun must be directly between Earth and the moon.
C) the moon must be directly between Earth and the sun.
D) the moon must be directly behind Earth.

37. Spring tides happen when

A) the moon, sun and Earth are in a line and gravity is not affected.
B) the moon, sun and Earth are in a line and their gravity works together
C) the moon, sun and Earth are at 90 degree angles and their gravity is not affected.
D) the moon, sun and Earth are at 90 degree angles and their gravity works together

38. Pathfinder and Perseverance landed on

A) Mercury
B) Venus
C) Mars
D) Titan

39. Refracting telescopes use ________ and reflecting telescopes use_________ to bend and focus light.

A) lasers, masers
B) mirrors, lenses
C) lenses, mirrors
D) photons, gluons

40. The probe ___________ studied Jupiter.

A) Huygens
B) Juno
C) Cassini
D) New Horizons

41. The Cassini probe studied which planet?

A) Jupiter
B) Saturn
C) Mars
D) Mercury

42. Why is Pluto not a planet?

A) it's too cold.
B) It's too small.
C) It's too far away.
D) It shares it's orbit with other Kuiper Belt objects.

43. Nebula, protostar, main sequence, red giant, planetary nebula, white dwarf is the life cycle of what kind of star?

A) high mass
B) medium mass
C) low mass

44. Nebula, protostar, main sequence, supernova, black hole (or neutron star) is the life cycle of what kind of star?

A) medium mass
B) low mass
C) high mass

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