The stress-strain behavior of ceramics is usually determined using: a. a tensile

Question

The stress-strain behavior of ceramics is usually determined using: a. a tensile test b. a compression test c. a bending test Ceramics have a disposition to fail by cracking because of: a. The difficulty for slip to occur (low to no plasticity) b. The higher density of flaws c. Their high melting points d. a and b In ceramics, strength: a. Is reliably the same in all samples b. Varies depending on sample size c. Varies depending on strain d. Is higher in compression than in tension e. b and d Glasses: a. Are non crystalline ceramics b. Deform by viscous flow c. Are often transparent d. All of the above The degree of polymerization is a measure of: a. The weight of one chain of polymer b. The weight of one repeat unit c. The number of repeat units in a polymer chain The weight average molecular weight and number average molecular weight are a. different measures of the molecular weight of the polymer b. the same number, just a different name c. the molecular weights of the repeat unit The bonds between 3 carbon atoms form an angle of: a. 55 degree b. 109 degree c. 180 degree d. random value When applying a stress to a viscoelastic polymer a. The strain increases instantaneously to a value equal to the stress divided by the Young's modulus b. The strain doesn't change c. The strain progressively increases and keeps increasing as long as the stress is being applied

Explanation / Answer

3ans) D The compressive strenght in deramics is 10times more than the tensile strenght.

4ans) D glass is a completely amaphorous(non crystalline) an transparent material and even deforms by viscous flow.

5ans) C the degree of polymerization is defined as the numbere of manometric units in a polymer chain.

6ans) A these are the two different measures to determine the polymer molecular weight

7ans) C the type of bonding is explained in terms of orbital hybridization.in case of acetelyne each carbon atom has two sp-orbitals and two p-orbitals the two sp-orbitals are linears and forms a 180degree angle.

8ans) A when a stress is applid the instantaneous elastic strain is developed for a constant stress value

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