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Eighth Grade (Grade 8) Science Questions

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Grade 8 Soil
In which environment might soil be MORE acidic?
  1. a dry environment
  2. a humid environment
  3. an Arctic region
  4. a mountain range
Grade 8 Solar System
Which of the following is true concerning the process described in Accretion Theory?
  1. would have occurred within a nebula
  2. since even the smallest particles have gravitational and other attractive forces between them, nearby particles were attracted together to form clumps of particles
  3. these clumps (called planetesimals ) now behaved like larger masses, which allowed them to pull on other particles that were farther away
  4. given enough time, the masses of particles ultimately coalesced into the structures that make up our solar system
  5. All of the above are true of the Accretion Theory
Grade 8 Solar System
What does the mnemonic device, "My Very Educated Mother Just Served Us Nine Pizzas," help us remember?
  1. That my mother is a very kind person, who likes to give us pizza.
  2. The order of the planets, from innermost to outermost, as they orbit the Sun.
  3. The distance between the planets, by replacing letters with specific numbers.
  4. None of the above.
Grade 8 Physics
Why is stability important in physical sciences?
  1. It helps in amplifying external forces acting upon a system
  2. It helps in resisting internal changes in a system
  3. It is essential for the survival of living organisms
  4. It helps in maintaining the equilibrium of a system
Grade 8 Physics
What is an example of stability through interactions and feedback in the field of engineering?
  1. Movement of planets in the solar system
  2. The behavior of a simple oscillator such as a pendulum
  3. Feedback mechanisms that regulate the control surface in an aircraft
  4. Stability of a pendulum that is maintained by feedback mechanisms
Grade 8 Physics
What is stability in physical sciences?
  1. The ability of a system to remain changed after experiencing a disturbance
  2. The ability of a system to return to its original state after experiencing a disturbance
  3. The ability of a system to amplify external forces acting upon it
  4. The ability of a system to resist internal changes
Grade 8 Physics
The strength of the force of friction depends on                           .
  1. the roughness of surfaces
  2. force acting on surfaces
  3. the smoothness of surfaces
  4. all of the above
Grade 8 Physics
Which of the following is equal to the net force acting on a drop of water?
  1. weight - drag force
  2. weight + drag force
  3. weight × drag force
  4. weight ÷ drag force
Grade 8 Physics
Which of the following is a chemical change that can occur due to heat?
  1. Melting of ice
  2. Boiling of water
  3. Burning of wood
  4. All of the above
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