Unit 1: Solid State — Online MCQ Test
CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Unit 1: Solid State with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers classification of solids crystal lattices unit cells packing efficiency radius ratio rules density calculations Bragg Law and point defects in solids..
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Unit 1: Solid State — Important Questions & Answers
Which of the following is an amorphous solid?
- A. Sodium chloride
- B. Quartz
- C. Glass
- D. Diamond
Answer: C. Glass
Glass does not have a long-range ordered arrangement of particles, so it is an amorphous solid.
Glass does not have a long-range ordered arrangement of particles, so it is an amorphous solid.
The number of atoms present per unit cell in a body-centered cubic (BCC) lattice is:
- A. 1
- B. 2
- C. 4
- D. 8
Answer: B. 2
A BCC unit cell has 8 corner atoms contributing 1 atom in total and 1 atom at the body center, making 2 atoms per unit cell.
A BCC unit cell has 8 corner atoms contributing 1 atom in total and 1 atom at the body center, making 2 atoms per unit cell.
How many atoms are present in one face-centered cubic (FCC) unit cell?
- A. 2
- B. 3
- C. 4
- D. 6
Answer: C. 4
An FCC unit cell has 8 corner atoms and 6 face-centered atoms, giving a total of 4 atoms per unit cell.
An FCC unit cell has 8 corner atoms and 6 face-centered atoms, giving a total of 4 atoms per unit cell.
Which of the following is NOT a characteristic of a crystalline solid?
- A. Definite geometrical shape
- B. Sharp melting point
- C. Long-range order
- D. Isotropic nature
Answer: D. Isotropic nature
Crystalline solids are anisotropic, not isotropic, because their properties vary with direction.
Crystalline solids are anisotropic, not isotropic, because their properties vary with direction.
Which statement correctly compares packing efficiencies and coordination numbers of common cubic structures?
- A. SC: 74%, CN 12; BCC: 68%, CN 8; FCC: 52%, CN 6
- B. SC: 52%, CN 6; BCC: 68%, CN 8; FCC: 74%, CN 12
- C. SC: 68%, CN 8; BCC: 52%, CN 6; FCC: 74%, CN 12
- D. SC: 74%, CN 12; BCC: 52%, CN 6; FCC: 68%, CN 8
Answer: B. SC: 52%, CN 6; BCC: 68%, CN 8; FCC: 74%, CN 12
Simple cubic has the lowest packing efficiency and coordination number, while FCC has the highest among the three common cubic structures.
Simple cubic has the lowest packing efficiency and coordination number, while FCC has the highest among the three common cubic structures.