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Eighth Grade (Grade 8) Science Questions

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Grade 8 :: Energy and Momentum by doliver701
Which situation is an example of increasing potential energy?
  1. a bicyclist stopping at a stop sign
  2. a cat jumping from a tree
  3. emptying a bucket of water
  4. pulling a wagon uphill
Grade 8 :: Scientific Method by mrsbateacher
Grade 8 :: Matter by CaryBloomquist
A gas has
  1. a definite shape and volume.
  2. a definite shape, but no definite volume.
  3. no definite shape or volume.
  4. no definite shape, but a definite volume.
Grade 8 :: Heat Transfer by doliver701
Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot?
  1. The hot water causes a chemical reaction to take place in the spoon.
  2. The heat from the hot water is conducted to the spoon handle.
  3. The hot water heats the air surrounding the upper part of the spoon.
  4. The hot water causes a physical change in the spoon handle.
Grade 8 :: Acids and Bases by aswindell
Which of the following are examples of acids?
  1. vinegar
  2. ammonia
  3. vitamin c
  4. alcohol
  5. oranges
  6. car batteries
  7. baking soda
  8. blood
Grade 8 :: Biochemistry by rebmidwife
The process where cells obtain energy from sugar molecules is called:
  1. biotic
  2. nitrogen cycle
  3. respiration
  4. food chains
Grade 8 :: Reactions by doliver701
Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes?
  1. shredding a piece of paper into hundreds of tiny strips
  2. dropping a dinner plate on the floor
  3. melting ice cubes in a glass of juice
  4. burning a piece of paper to ashes in a fireplace
Grade 8 :: Evolution by sharrik
Different kinds of plants living in the same area must compete for water. Which plant represents "survival of the fittest"?
  1. the plant with the largest leaves
  2. a plant with a compact root system
  3. the plant with the largest root system
  4. a plant with needles instead of leaves
Grade 8 :: Bonds and Mixing by doliver701
Compare and contrast mixtures and compounds. Which statement is true about mixtures and
compounds?
.
  1. Both mixtures and compounds are the same throughout.
  2. Mixtures and compounds are made of two or more elements in a definite proportion.
  3. Mixtures must be separated by chemical methods and compounds by physical methods.
  4. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
Grade 8 :: Matter by CaryBloomquist
Sublimation is a change from a
  1. solid to a liquid.
  2. gas to a liquid
  3. solid to a gas
  4. liquid to a solid
Grade 8 :: Scientific Method by ncarlson0923
Which is NOT a component of critical thinking?
  1. using what you already know
  2. being skeptical
  3. identifying facts and opinions
  4. assuming something is true
Grade 8 :: Forces and Motion by ncarlson0923
Grade 8 :: Forces and Motion by ncarlson0923
What features determine an object's acceleration?
  1. the forces acting on it and its size
  2. the forces acting on it and its mass
  3. the forces acting on it only
  4. its weight and its mass
Grade 8 :: Forces and Motion by ncarlson0923
When is the velocity of an object constant?
  1. when only its speed changes
  2. when only its direction changes
  3. when its speed and its direction both change
  4. when neither its speed nor its direction change
Grade 8 :: Forces and Motion by ncarlson0923
Why is Newton's first law sometimes called the law of inertia?
  1. because inertia is the tendency of objects to resist changes to their motion
  2. because inertia describes the application of force to an object at rest
  3. because inertia describes the applications of force to an object in motion
  4. because inertia is the same thing as friction
Grade 8 :: Forces and Motion by ncarlson0923
How often does the tip of an hour hand on a clock have the same velocity?
  1. once every minute
  2. once every hour
  3. once every 12 hours
  4. once every 24 hours
Grade 8 :: Scientific Method by ncarlson0923
Why is Newton's law of gravitational force called a scientific law?
  1. because it is a rule that describes a pattern in nature
  2. because it is a logical explanation of an observation
  3. because it is a statement of what will happen next
  4. because it is an inference based on tested hypotheses
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