Ques:Q: A point defect can be an atom missing from a site in the crystal known as a what? Read this paragraph and choose the correct option from the provided answers: Summary Real crystals contain large numbers of defects. Defects may affect only a single point in the lattice (a point defect), a row of lattice points (a line defect), or a plane of atoms (a plane defect). A point defect can be an atom missing from a site in the crystal (a vacancy) or an impurity atom that occupies. Choices: - void - deficiency - vacuum - vacancy A:

Ans:vacancy
-----
Ques:Q: What shape are the eight sides of an octahedra? Read this paragraph and choose the correct option from the provided answers: Cubes have six sides that are all the same size square. All of the angles in a cube are equal to 90. Rhombohedra also have six sides, but the sides are diamond-shaped. Octahedra have eight sides that are all shaped like triangles. Choices: - rectangles - hexagon - square - triangles A:

Ans:triangles
-----
Ques:Q: What type of animal in the sea spend most of their lives as medusae? Read this paragraph and choose the correct option from the provided answers: Jellyfish spend most of their lives as medusae. They live virtually everywhere in the ocean. They prey on zooplankton, other invertebrates, and the eggs and larvae of fish. Choices: - fish - sharks - whales - jellyfish A:

Ans:jellyfish
-----
Ques:Q: What mirrors diverge light rays and, thus, have a negative focal length? Read this paragraph and choose the correct option from the provided answers: behind the mirror. Convex mirrors diverge light rays and, thus, have a negative focal length. Choices: - curved - concave - diffraction - convex A:

Ans:
convex
-----