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Eighth Grade (Grade 8) Science Questions

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Grade 8 Physics
Which one of the following quantities is not a vector quantity?
  1. mole of a substance
  2. displacement
  3. pressure
  4. velocity
Grade 8 Physics
If the speed of the object decreases, which of the following statement is true?
  1. the object decelerates
  2. the object has positive acceleration
  3. the object has zero acceleration
  4. the object has a constant velocity
Grade 8 Physics
If the motion of the object is rectilinear, what happens with the velocity of the object?
  1. The velocity of the object remains constant.
  2. The velocity of the object increases.
  3. The velocity of the object decreases.
  4. The velocity of the object becomes zero.
Grade 8 Physics
The distorted motion of a body is known as                           .
  1. vibratory motion
  2. random motion
  3. circular motion
  4. vibratory and translational
Grade 8 Forces and Motion
What is tension?
  1. a force that comes when you are stressed
  2. a force that presses or squeezes something together
  3. a force that acts to expand or lengthen the thing it is acting on
Grade 8 Space Exploration
Match the following terms to their corresponding definition.
__ Energy due to temperature A. Wien’s law of radiation
__ Theoretical perfect radiator B. Radiation spectrum
__ A wavelength is inversely proportional to its temperature C. Blackbody
__ Shows how much energy a body radiates at different wavelengths D. Astronomical observatory
__ A place equipped for the observation of sky objects E. Thermal radiation
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