(6) Which of the following elements is not present abundantly in earth’s crust:
(a) Silicon
(b) Radium
(c) Aluminum
(d) Carbon
(7) The famous book; Al – Qanoun was written by the Muslim scientist:
(a.) Jabar bin Hayyan
(b) Zakariya Al – Razi
(c) Abu Ali Sina
(d) Abdul Qasim Majreeti
(8) Basic metals can be converted into gold by:
(a) Heating
(b) Beating
(c) Artificial nuclear radioactivity
(d) Chemical reaction
(9) A light year is a unit of:
(a) Time
(b) Energy
(c) Length
(d) Mass
(10) One of the main function of the earth’s ozone layer is to:
(a) Prevent global warming
(b) Filter out ultraviolet rays
(c) Absorb pollution
(d) All of the above
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