Ques:Q: A point defect can be an atom missing from a site in the crystal known as a what? Choices: - void - deficiency - vacuum - vacancy A:

Ans:vacancy
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Ques:Q: What shape are the eight sides of an octahedra? Choices: - rectangles - hexagon - square - triangles A:

Ans:triangles
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Ques:Q: What type of animal in the sea spend most of their lives as medusae? Choices: - fish - sharks - whales - jellyfish A:

Ans:jellyfish
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Ques:Q: What mirrors diverge light rays and, thus, have a negative focal length? Choices: - curved - concave - diffraction - convex A:

Ans:
convex
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