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 revolution around the sun.
B) the tilt of Earth’s axis.
C) Earth’s rotation on its 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) white dwarf.
B) quasar.
C) red giant.
D) supernova.

4. Earth has seasons because

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

6. A light-year is

A) the distance from Earth to Proxima Centauri.
B) the amount of light the sun produces in a year.
C) the distance light travels in a year.
D) 365 days.

7. The four terrestrial planets all have

A) rocky surfaces
B) hot temperatures
C) large size
D) deep atmospheres

8. A supernova is the explosion of a dying

A) medium-mass star.
B) high-mass star.
C) protostar.
D) low-mass star.

9. A star is born when

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

10. Characteristics used to classify stars include

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

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

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

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

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

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

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

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

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

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

A) wind.
B) air pressure.
C) gravity.
D) the greenhouse effect.

16. A(n) _______________ is a loose collection of ice, dust, and small rocky particles that typically has a long, narrow orbit.

A) planet
B) comet
C) meteoroid
D) asteroid

17. The Sun produces energy in a process known as nuclear ____________.

A) radiation
B) resonance
C) fission
D) fusion

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

A) revolution
B) distance
C) rotation

19. The ____________of the moon depend on how much of the lighted side of the moon can be seen from Earth.

A) pieces
B) chunks
C) phases
D) crust

20. Astronomers typically measure distances to stars in units called _____________.

A) light years
B) meters
C) kilometers
D) astronomical units

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) the same
B) longer
C) shorter

23. The Milky Way is an __________ galaxy

A) irregular
B) quasar
C) elliptical
D) spiral

24. The sun and moon seem to move across the sky each day because of Earth’s _______________.

A) orbit
B) revolution
C) rotation
D) tilt

25. _____________ are areas of gas on the sun that are hotter than the rest of the sun and can release x-rays.

A) White spots
B) Solar flares
C) Solar bombs
D) Prominences

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

A) air resistance
B) friction
C) gravity

27. According to the __________ the universe formed about 14 billion years ago.

A) Law of Thermodynamics
B) Big Bang Theory
C) Universal Law of Gravitation
D) Theory of Plate Tectonics

28. __________ are areas of gas on the sun that are cooler than the gases around them.

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

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

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

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

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

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

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

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

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

33. One astronomical unit is equal to:

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

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

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

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

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

36. For a lunar eclipse to occur,

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

37. Spring tides happen when

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

38. Pathfinder and Perseverance landed on

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

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

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

40. The probe ___________ studied Jupiter.

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

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

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

Created with That Quiz — the site for test creation and grading in math and other subjects.