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Reading comprehension Full Pratice Question 1-5 Carbon dating can be used to estimate the age of any organic natural material, it has been used succesfully in archeology to determine the age of ancient artifact or fossil as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on earth. Since a radioactive substance such as carbon 14 has a known half life the amount of carbon 14 remaining in an object can be used to date that object. Carbon 14 hast a half life of 5,570 years which means that after that number of year half of the carbon 14 atoms have decayed into netrogen 14 it is the ratio of carbon 14 to nitrogen 14 in that substance that indicates the age of s


Questions and Answers
  • 1. 
    This page is mainly about
    • A. 

      The defferences between carbon -14 and nitrogen.

    • B. 

      One method of dating old objects

    • C. 

      Archeology and the study of ancient artifacts

    • D. 

      Various use for carbon.

  • 2. 
    The word “estimate” in line 1 closest in meaning to
    • A. 

      Understand

    • B. 

      Hide

    • C. 

      Rate

    • D. 

      Approximate

  • 3. 
    The pronoun “it” in line I refers to
    • A. 

      Carbon dating

    • B. 

      The age

    • C. 

      Any organic natural material

    • D. 

      Archeology

  • 4. 
    Which of the following is  not trus about carbon 14
    • A. 

      It is radioactive

    • B. 

      It’s half-life is more than 5000 years

    • C. 

      It and nitrogen always exist in equal amounts in any substance

    • D. 

      It can decay into nitrogent 14

  • 5. 
    The expression “is left” in paragraph 3
    • A. 

      Remains

    • B. 

      Has disappeared

    • C. 

      Changes

    • D. 

      Is gone