8th Grade Science 3: Question Preview (ID: 30901)


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If Joey is pushing a box to the right with 125 Newtons and Susie is pushing the same box with 125 Newtons the left. Which of the following correctly describes the motion of the box?
a) The object is unbalanced and will move 125 Newtons to the right b) The object is unbalanced and will move 250 Newtons to the left c) The object is balanced and will not move d) The object is balanced and will move 125 Newtons to the right
Which of the following best explains why we see white objects?
a) reflection of visible light waves b) absorption of visible light waves c) transmission of visible light waves d) refraction of visible light waves
Which of the following refracts light to the lens and protects it from the environment?
a) retina b) cornea c) convex lens d) optic nerve
Which of the following best explains why you can see yourself in the mirror?
a) transmission b) reflection c) refraction d) absorption
Which of the following is the lowest energy electromagnetic wave?
a) visible light b) radio waves c) sound waves d) seismic waves
Which of the following BEST explains why a heavier object is harder to move?
a) The more mass an object has the less inertia b) The more mass an object has the more inertia c) the less mass an object has the more inertia d) heavier object require more force because they have less inertia
Which of the following forces can speed up or slow down the speed of an object?
a) friction b) gravity c) air resistance d) all of the answer choices
When the northern hemisphere is tilted away from the Sun which of the following is true about Earth's seasons in the northern hemisphere?
a) the north gets more direct rays and longer days b) the north gets more indirect rays and longer days c) the north gets more indirect rays and shorter days d) the north gets more direct rays and shorter days
Which of the following correctly orders celestial objects from smallest to largest?
a) meteorites, planets, stars, solar systems, galaxy, universe b) planets, meteorites, stars, solar systems, galaxy, universe c) universe, galaxy, solar systems, planets, meteorites d) stars, planets, meteorites, solar systems, galaxy, universe
Which of the following burns to produce energy?
a) Minerals b) Igneous rocks c) Fossil fuels d) Metals
Which of the following is defined by the carrying away of rock?
a) Weathering b) Erosion c) Deposition d) Sedimentary
Which of the following seismic waves cannot travel through the liquid metal outer core of Earth?
a) Primary waves b) Secondary waves c) Surface waves d) all of the answer choices
During what moon phase would you expect neap tides which are moderate low and high tides each day?
a) new moon b) full moon c) waning gibbous d) first quarter
Which of the following causes electrical disturbances and auroras on Earth?
a) photosphere b) corona c) solar winds d) sunspots
During what moon phases is a Solar eclipse possible?
a) new moon b) full moon c) first quarter d) waxing gibbous
Which of the following best explains why the Earth has seasons?
a) Earth's elliptical orbit b) Earth's tilted axis and revolution c) Earth's distance to the Sun d) Earth's tilted axis and rotation
Which of the following fossil types is made by an organism stepping in soft mud or sand that hardens into stone over thousands of years?
a) Petrified fossils b) Preserved fossils c) Carbonized fossils d) Trace fossils
Which of the following according to the fossil record is the oldest?
a) Trilobites b) Reptiles c) Mammals d) Birds
Which of the following explains why birds had different beak adaptations on the Galapagos islands?
a) Different food sources b) Different climate c) Different predators d) Different geographic area
Which of the following best explains why we see black?
a) absorbtion of visible light waves b) transmission of visible light waves c) refraction of visible light waves d) reflection of visible light waves
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