39.The most common site for CSF rhinorrhea

a. frontal bone b. ethmoid bone
c. tegmen tympani d. none

ANS. b ethmoid bone

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38.The largest sized pororsity is:

1. Micro porosity. 2. Pin hole porosity.
3. Suck back porosity 4. Gas inclusion porosity

ANS.3 ref Skinner’s 10th -518


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37.The minimum percentage of binder that should be present in the gypsum bonded investment is:

1. 10%. 2. 25%.
3. 50%. 4. 75%.


ANS.2 REF Skinner’s 10th -472

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