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General Knowledge > General Science

BASIC OF LIFE - CELLS MCQs

Half Life, Diversity Of Life, Cell The Unit Of Life

Total Questions : 115 | Page 11 of 12 pages
Question 101. Complete the nuclear reaction85209At = ___ + 24He
  1.    83205Bi
  2.    86209Rn
  3.    81207Tl
  4.    85208At
 Discuss Question
Answer: Option A. -> 83205Bi
Question 102. Why does alpha decay occur?
  1.    The nucleus is too large to be stable
  2.    The proton to neutron ratio is unstable
  3.    The nucleus is in an excited state. This usually follows other types of decay.
  4.    The isotope has too many high energy electrons
 Discuss Question
Answer: Option A. -> The nucleus is too large to be stable
Question 103. What is the relative charge of an alpha particle?
  1.    -1
  2.    0
  3.    1
  4.    2
 Discuss Question
Answer: Option D. -> 2
Question 104. When radioactive particles get on objects
  1.    contaminated
  2.    irradiated
  3.    dead
  4.    isotopes
 Discuss Question
Answer: Option A. -> contaminated
Question 105. In beta decay a ______ is emitted from the nucleus
  1.    Neutron
  2.    Electron
  3.    Proton
  4.    Wave
 Discuss Question
Answer: Option B. -> Electron
Question 106. Which type of radiation is used by smoke detectors?
  1.    Alpha
  2.    Beta
  3.    Gamma
  4.    Neutron
 Discuss Question
Answer: Option A. -> Alpha
Question 107. What is the only difference between two different isotopes of the same element?
  1.    Number of neutrons
  2.    Number of protons
  3.    Number of electrons
  4.    Size of atom
 Discuss Question
Answer: Option A. -> Number of neutrons
Question 108. The unit of activity is ____________
  1.    rutherford
  2.    Becquerel
  3.    Both A & B
  4.    None of these
 Discuss Question
Answer: Option B. -> Becquerel
Question 109. A bone sample contains only 1/4 of its original radioactive C14 content
  1.    1 C14 half-life
  2.    2 C14 half-lives
  3.    3 C14 half-lives
  4.    4 C14 half-lives
 Discuss Question
Answer: Option B. -> 2 C14 half-lives
Question 110. Radioactive carbon-14 is often useful in determining the absolute age of geologic samples because radioactive isotopes
  1.    decay at a regular rate
  2.    become less stable during decay
  3.    remain unchanged over time
  4.    stabilize after four half-lives
 Discuss Question
Answer: Option A. -> decay at a regular rate

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