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Eighth Grade (Grade 8) Science Questions

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Grade 8 Periodic Table and Elements
What is the element symbol for aluminum?
  1. A
  2. Am
  3. Al
  4. Au
Grade 8 Waves and Sound
What does the term "10x" represent in microscopy?
  1. The number of lenses in a microscope
  2. The size of the microscope
  3. The number of microorganisms visible
  4. The level of magnification
Grade 8 Planetary Motion
During a solar eclipse, the shadow of                 falls on                .
  1. Earth; the Sun
  2. the Sun; Earth
  3. Earth; the Moon
  4. the Moon; Earth
Grade 8 DNA, RNA, and Genetics
Gregor Mendel studied genetics by crossing pea plants that had different traits. What did Mendel describe as a dominant trait?
  1. a trait that is seen in every offspring
  2. a trait that is due to environmental influence
  3. a trait that is present only when an offspring inherits two dominant “factors” (alleles)
  4. a trait that is present when an offspring inherits at least one dominant “factor” (allele)
Grade 8 Waves and Sound
The speed of a wave can be calculated if                            and                            are given.
  1. Amplitude and wavelength
  2. Amplitude and frequency
  3. Wavelength and time period
  4. Wavelength and frequency
Grade 8 Human Reproduction
What is the urethra?
  1. passageway for the egg and the place where conception occurs
  2. coiled tube system in which sperm mature
  3. tube from the bladder through which urine leaves the body
  4. gland that produces a clear, sticky fluid when the male is sexually excited
Grade 8 Human Reproduction
What is testosterone?
  1. coiled tube system in which sperm mature
  2. sperm cell joined with the egg cell
  3. organ that nourishes the fetus
  4. a male sex hormone
Grade 8 Oceanography and Hydrology
The water found in the space between rock particles below Earth's surface is called                .
  1. groundwater
  2. water table
  3. spacewater
  4. surface water
Grade 8 Forces and Motion
What is the momentum of a 57-kg cheetah running north at 27 m/s?
  1. 1,539 kg-m/s north
  2. 999 kg-m/s north
  3. 2.1 kg-m/s north
  4. 0.47 kg-m/s north
Grade 8 DNA, RNA, and Genetics
An organism has the genotype of Bb for a certain trait. What describes the genotype of this organism?
  1. homozygous
  2. heterozygous
  3. inbred
  4. codominant
Grade 8 Scientific Methods and Applications
When translated,                 means "false science."
  1. pseudopodia
  2. pseudoscience
  3. astrology
  4. astronomy
Grade 8 Cell Structure and Function
Which organelle functions as a factory that produces proteins?
  1. cytoplasm
  2. lysosome
  3. ribosome
  4. endoplastmic reticulum
Grade 8 Rocks
Made of sedimentary rock formed from the remains of dead sea animals
  1. lava
  2. limestone
  3. ridge plateau
  4. loess deposits
Grade 8 Communities, Populations, and Ecosystems
What is the maximum number of individuals an ecosystem can support?
  1. population density
  2. carrying capacity
  3. succession limit
  4. habitat maximum
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