Which of the Following Statements About Ceramics Is Incorrect

question 77

Multiple Choice

Which of the following statements about ceramics is incorrect?

• A)Silicon carbide has a diamond-like structure.
• B)Boron nitride can exist in both diamond-like and graphite-like forms.
• C)Silicon carbide can be prepared by direct reaction of silicon and carbon.
• D)Superconducting ceramics present manufacturing difficulties owing to their brittleness.
• E)Superconducting ceramic compounds usually incorporate cobalt in a key role.

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Definitions:

Glacier

A large, slow-moving mass of ice formed by the compaction and crystallization of snow, found in cold regions and high altitudes.

Tsunami

A large, long high sea wave caused by underwater earthquakes, volcanic eruptions, or landslides.

Sublimation

The process by which material moves from a solid phase directly into a vapor, as occurs when a glacier loses ice molecules directly to the air.

Equilibrium Line

The zone in a glacier where the losses of ice and snow balance the accumulation of ice and snow.