Consider a defect in a crystalline lattice as shown below. Which of the following statements is true? B 50 Select one: O a. The region around B experiences a higher strain on the upper side compared to the lower side Ob. The region around B is unaffected by the impurity Oc. The region around B experiences mainly compressive strain Od. The region around B experiences mainly shear strain

Which of the following are true regarding crystalline and non-crystalline materials at the atomic scale? Select one or more: a. Crystalline materials show no long-range order b. There are an infinite number of crystal systems and lattices possible C. Density of packing is higher for crystalline materials d. Bond energy is lower for noncrystalline materials Materials which are not crystalline are referred to as amorphous Bond length is shorter for crystalline versus noncrystalline materials e.

Q1/A Prove that the volume of an FCC unit cell, Vc is; Vc = 16R³√2 B) Explain in general terms, why many polymers and some ceramic glasses have an amorphous or semicrystalline structure.

Which of the following statements are true of dislocations: Select one or more: a. Dislocations are spatially fixed defects b. Dislocations arise due to insertion of a foreign atom into a lattice site of a “host” metal c. Dislocations can be viewed without the aid of a microscope d. Dislocations enable plasticity in metals e. Dislocations can arise due to shear deformation of the lattice

Silver Ag has the fcc crystal structure as shown in the figure below. Determine its atomic packing factor APF? Given: The radius of Germanium: r(Ag)= 0.144 nm.  Select one: a. 0.14 b. 0.34 c. 0.68 d. 0.12 e. 0.4 f. 0.51 g. 0.74 h. 0.21

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Pravinbhai

The vacancy concentration for a metal A with an activation energy Q is 2x10-5. Calculate the vacancy concentration for a second metal B with activation energy 1.2Q. (This question has only one correct answer) а. 2.3 x 10-6 b. 4.3 x 10-5 O c. 1.3 x 10-6 d. 3.3 x 10-4