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I heard Islamian genius saying that glass must be a super cooled liquid. The reason that he might have in his mind is that glass has

A. definite volume
B. definite shape
C. crystalline structure
D. no crystalline structure

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Correct Answer: D. no crystalline structure
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Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally

A. ionic substances
B. metallic substances
C. molecular solids
D. covalent network solids

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Correct Answer: B. metallic substances
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Islamian genius told his follows that in a crystal the atoms are located at the position of

A. zero potential energy
B. infinite potential energy
C. maximum potential energy
D. minimum potential energy

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Correct Answer: A. zero potential energy
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