Only answer choices are needed, no need to explain the questions

1. The high strength of Coming-Ware 2 is due to (a)aflamepolishedsarface(b)precipitationbardering(c)vitrification(d)cross-linking (c) none of these 2. Choose the false option or choose (e). For ceramies (a) the bonds can carry load (b) cracks act as stress-concentrators (c) compressive forces can close cracks (d) cracks cannot be blunted by grain boundaries (o) all these are true 3. Windshiclds of cars are made of a) polycarbosate b) compressed glass c) tempered glass d) laminated glass c) pone of these 4. In metals, beat is conducted by wbile in ceramics it is conducted by (a) protons, electrons (b) electrons, phonons (c) phonons, atom knock-on (d) phonons, eloctrons (c) none of these 5. usually expand less than when heated. (a) cernmir metrls (c) (b) metals, ceramics (c) polymers, ceramics (d) polymers, 6. Impurities the conductivity of metals. 7. In general, for a covalently bonded material, the thermal expansion would be thermal conductivity would be than for a metallic material. and the (a) bigher, lower (b) higher, higher (c) lower, lower (d) higher, lower (c) none of these 8. In the making of a glass ceramic all the following are involved except (a) devitrification (b) nucleation (c) sceding (d) crystallization (c) all these are correct 9. When a metal gets a crack in it the crack usually (a) eanses the metal to fail catastrophically (b) gets bluntod through the slip of planes (c) is filled by mobile atoms netr the crack tip (d) stops an its own (c) none of these 10. Which of the follosing is a reason why dinlocations don't move through ceramics? (a) directed covalent boeds (b) stanll grains (c) movernent of like charges over one another (d) both a and b (c) both a and e 11. What in dot average grain size in glass? w) 0.51 micruns b) 0.5 microns c) 5 raicrons d) 10 microns e) none of these