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Eighth Grade (Grade 8) Science Questions

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Grade 8 Physics
Which one of the following is not a radioactive isotope?
  1. Sulphur-35
  2. carbon-13
  3. tritium
  4. carbon-14
Grade 8 Physics
Unstable nuclides are a type of isotope. Which of the following characteristics belong to the unstable nuclides?
  1. they emit different radiations
  2. they have unstable nuclei
  3. they are radioactive
  4. all of these
Grade 8 Physics
Which one represents the three naturally-occurring isotopes of potassium?
  1. k-39, k-38, and, k-37
  2. k-44, k-43, and k-42
  3. k-41, k-40 and, k-39
  4. k-34, k-32, k-31
Grade 8 Physics
Which one of the following rays is used as a treatment for cancer?
  1. alpha-rays
  2. beta-rays
  3. gamma-rays
  4. x-rays
Grade 8 Physics
Helium-4 nuclei atoms are identical to the                .
  1. alpha particles
  2. beta particles
  3. gamma particles
  4. delta particles
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