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General Knowledge :: General Science

  1. The type of glass used in making lenses and prisms is

  2. A.
    jena glass
    B.
    soft glass
    C.
    pyrex glass
    D.
    flint glass

  3. Which one of the following is the petroleum wax?

  4. A.
    Paraffin wax
    B.
    Jonoba wax
    C.
    Carnauba wax
    D.
    Bees wax