Quiz for Crystal lattice

Q1: How many atoms are present in a body-centered cubic (BCC) unit cell?

A. 1 B. 2 C. 4 D. 6

Q2: Which type of unit cell has atoms only at the corners?

A. BCC B. FCC C. Simple cubic D. Hexagonal

Q3: In face-centered cubic (FCC) structure, atoms are present at which positions?

A. Corners and faces B. Corners only C. Center only D. Edges only

Q4: The coordination number of atoms in a BCC lattice is:

A. 6 B. 8 C. 12 D. 4

Q5: What is the packing efficiency in FCC structure?

A. 52.4% B. 68% C. 74% D. 60%

Q6: Which of the following is a characteristic of metallic solids?

A. High melting point B. Ionic bonding C. Presence of lone pairs D. Weak dispersion forces

Q7: The edge length of a BCC unit cell is 400 pm. What is the atomic radius?

A. 173 pm B. 231 pm C. 200 pm D. 150 pm

Q8: Which crystal system has unequal axes and angles not equal to 90°?

A. Cubic B. Tetragonal C. Triclinic D. Orthorhombic

Q9: Which solid shows long-range order and sharp melting point?

A. Crystalline solid B. Amorphous solid C. Isotropic solid D. None of these

Q10: What is the relationship between edge length (a) and radius (r) in FCC?

A. a = 2r B. a = 4r C. a = 2√2r D. a = √3r