Free Solids MCQs with Answers
23 Solids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
23 questions · page 3 of 3
21. Which one shows anisotropic behavior?
- A. Wood
- B. Gemstone
- C. Coke
- D. Graphite
Explanation: This is the option marked correct in the official UHS answer key. Graphite is crystalline with a strongly layered structure, so properties such as electrical conductivity differ enormously along the layers compared with across them, which is the essence of anisotropy. Coke is amorphous and therefore isotropic. Note that gemstones are crystalline and anisotropic too, and wood is anisotropic in the everyday sense of grain, so this question rests on the crystalline definition.
Correct answer: Graphite22. In a unit cell of a crystal lattice the angle beta is between faces:
- A. a and b
- B. b and c
- C. c and a
- D. Not specified
Explanation: By convention the three interfacial angles of a unit cell are alpha between the b and c axes, beta between c and a, and gamma between a and b, each angle being named after the axis it does not lie against. Together with the three edge lengths, these six parameters define the cell completely. The Greek letter did not print cleanly in the original paper, appearing there as a stray character.
Correct answer: c and a23. Pick the crystalline solid:
- A. Cement
- B. Ceramics
- C. Concrete
- D. Copper
Explanation: Copper is a metal whose atoms sit in a regular repeating lattice, so it is crystalline and melts at one sharp temperature. Cement, ceramics and concrete are amorphous or mixed materials with only short range order, so they soften over a range rather than melting cleanly. A sharp melting point is the practical test for crystallinity.
Correct answer: Copper