8th Grade Science 1 Question Preview (ID: 30867)
8th Grade Science Review 1.
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What is the function of a convex lens?
a) to filter and transmit light
b) to separate white light
c) to refract light and magnify objects
d) to reflect light so objects will be more visible
Which of the following will most likely fossilize?
a) Bones and teeth
b) Skin and muscle tissue
c) Internal organs
d) An entire organisms buried slowly
Which of the following correctly orders units of geologic time from largest to smallest?
a) period, epoch, era, eon
b) epoch, period, era, eon
c) era, eon, period, epoch
d) eon, era, period, epoch
Which of the following correctly orders organisms over geologic time according to the fossil record from earliest to youngest?
a) bacteria (precambrian), marine life (paleozoic), reptiles (mesozoic), mammals (cenozoic
b) mammals (cenozoic), reptiles (mesozoic,) marine life (paleozoic), bacteria (precambrian)
c) bacteria (precambrian), reptiles (mesozoic), mammals (cenozoic), marine life (paleozoic)
d) marine life (paleozoic), bacteria (precambrian), reptiles (mesozoic), mammals (cenozoic)
How are the 3 sedimentary, metamorphic, and igneous rocks in the rock cycle classified?
a) according to their physical properties
b) according to where they are located
c) according to how they are made
d) according to their relative age
Which of the following is accurate about Earths revolution and rotation?
a) Earth completes one revolution and one rotation every day
b) Earth completes one revolution in a year and one rotation in a day
c) Earth completes one revolution and rotation in a month
d) Earth completes one revolution in a year and one rotation in a month
Which unit of measurement would scientists use to measure distant stars?
a) kilometers
b) light years
c) miles
d) meters
Which of the following best explains why the Earth has seasons?
a) The Earth revolves around the Sun on a tilted axis changing the angle of the Sun's rays and daylight hours.
b) The Earth revolves around the Sun in an elliptical orbit and is sometimes closer and father from the Sun
c) The Earth's climate is always changing and is not predictable each year.
d) The Earth orbits the Sun on a tilted axis that causes one hemisphere to be closer to the Sun in summer.
Which of the following celestial objects has the greatest gravitational pull ?
a) Mercury because it is closest to the Sun
b) The Sun because it has the greatest mass
c) Earth because it is the most dense terrestrial planet
d) Jupiter because it is the largest planet
What happens to the length of day in the north when the northern hemisphere is tilted toward the Sun during the summer?
a) the length of day decreases
b) the length of day increases
c) the length of day remains the same
d) the rays from the Sun hit the northern hemisphere more indirectly
Which of the following is the correct formula to find the average speed of any object?
a) total distance times total time
b) total distance divided by total time
c) total time divided by total distance
d) total time plus total distance
What would happen to the orbit of the Earth if the gravitational force from the Sun suddenly stopped?
a) The Earth would continue to orbit the sun in an elliptical path due to the force of gravity
b) The Earth would continue to move in a straight line due to it's inertia
c) The Earth would be pulled into the Sun due to the force of gravity
d) The size of Earth would become smaller due to inertia
If a car is traveling forward with a force of 100N and the force of friction is acting in the opposite direction at 20N. What is the net force acting on the car and the direction?
a) 80 Newtons forward
b) 120 Newtons forward
c) 100 Newtons backwards
d) 20 Newtons backwards
Which of the following electromagnetic waves is best for wireless technology and communication?
a) Gamma waves because it has high energy and shorter wavelengths
b) Radio waves because it has a lower energy and longer wavelengths
c) Visible light because it is visible to the human eye
d) X-rays because they have a high energy and a high frequency
Which of the following best explains an echo?
a) Sound waves are refracted off objects
b) sound waves are transmitted through objects
c) sound waves are absorbed by objects
d) sound waves are reflected off objects
Which of the following explains why we can see and feel energy from the Sun?
a) electromagnetic waves from stars can travel through empty space without a medium
b) electromagnetic waves from stars vibrate through a medium
c) electromagnetic waves from stars transfer matter and not energy
d) electromagnetic waves from stars are mechanical waves that can travel through space
How does a prism reveal all the colors of the rainbow (ROYGBIV) that make up white light?
a) the prism refracts different wavelengths of light
b) the prism acts as a lens to reflect white light
c) the prism adds colors to white light as it transmits through
d) the prism absorbs colors of white light as it passes through
Which electromagnetic wave has the lowest frequency and the largest wavelengths?
a) radio waves
b) microwaves
c) visible light
d) gamma rays
Which of the following best explains why a grass appears green in the summer?
a) the grass reflects the green wavelength and absorbs all the other colors
b) the grass absorbs the green wavelength and reflects all the other colors
c) the grass emits green light and our eyes absorb all other color wavelengths
d) the grass emits all colors and our eyes absorb the green wavelength
What is the difference between a low frequency and a high frequency wave?
a) speed
b) amplitude
c) wavelength
d) volume
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