Which of the following is not an ingredient in Portland cement?
A) anhydrous calcium oxide
B) silicon dioxide
C) hydrated calcium sulfate
D) aluminum oxide
Correct Answer:
Verified
Q30: Doped silicon is used in
A) magnets.
B) transistors.
C)
Q31: Most metals are found in the Earth
Q32: Which of the following elements is found
Q33: Roasting of metal ores in air
A) converts
Q34: Glass is annealed so that
A) silicon is
Q36: Asbestos is
A) a glass.
B) a form of
Q37: Superconductivity is the result of
A) extremely low
Q38: Which of the following can be melted
Q39: A common element used in many semiconductors
Q40: Bauxite is the name of an aluminum
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