1-The direction indices for the crystallographic direction indicated by the vector are a) [101] b) [ī1 0] c) [110] d) [111] 2-A metal has an FCC structure with a lattice parameter of 0.362 nm and atomic weight of 63.54 g/mol The metal density in g/cm³ is a) 8.98 b) 897.9 c) 0.11 d) 5846 3- If a load is applied on a wire and its radius is stretched to the double. The Young's modulus will a) be doubled b) be halved c) become four times d) remain unaffected 4- Tensile strength of a material is obtained by dividing the maximum load during the test by the a) minimum area after fracture. b) instantaneous area at fracture. c) original area. d) average of (b) & 5- Increasing crystalline imperfections raises the a) conductivity b) electric field c) velocity d) resistivity

)The interplanar spacing for an orthorhombic unit cell is given by 1 h2 k2 12 C2 o Reduce this expression for a crystal having cubic symmetry. a2 b2 Text Predictions: On Accessibility: Good to go Focus arch 99+ W 9:15 PM 58°F Sunday 1/23/2022 hp

What are the highest symmetry crystal systems the unit cells below can belong to ? and why? (a) 12.32 13.45 17.85  90.0 90.0  91.7  b)22.45  13.72  24.21  90.0  90.0  90.0 c)23.32  23.32  8.76  90.0   90.0   120.0 d)6.74  6.74    14.12   80.7  80.7   77.6 e)12.11  10.96  10.96    90.0   90.0  90.0

Q1- Choose the correct answer for the following (Justify your answer): 1-The direction indices for the crystallographic direction indicated by the vector are a) [101] b) [1 1 0] c) [110] d) [111]