1. Q1.which of the following are types of investments used in Dentistry? A. Gypsum bonded B. Phosphate bonded C. Ethyl silicate bonded D. All of above

2. Q2.Casting shrinkage in type II investment is compensated by A. Hygroscopic expansion B. Thermal expansion C. Normal expansion D. None

3. Q3.Gypsum bonded investment should not be heated above A. 200 degree B. 400 degree C. 600 degree D. 700 degree

4. Q4.investment used for conventional gold casting alloys A. Gypsum bonded B. Phosphate bonded C. Ethyl silicate bonded D. Sulfur bonded

5. Q5.hygroscopic setting expansion maximum permitted is A. 1.2% B. 2.2% C. 3.2% D. 4.2%

6. Q6.investment used for commercially pure titanium and titanium alloys A. Gypsum bonded B. Phosphate bonded C. Ethyl silicate bonded D. Sulfur bonded

7. Q7.compressive strength for inlay investment shoul not be less than _____ Mpa? A. 1 B. 1.2 C. 2 D. 2.4

8. Q8.setting time for dental inlay casting investment is between A. 5-10 minutes B. 10-15 minutes C. 5-25 minutes D. 5 min to 1 hour

9. Q9. which of the following has greatest value? A. Hygroscopic expansion B. Thermal expansion C. Normal setting expansion D. None

10. 10. Gypsum bonded investment uses A. Calcium hemihydrate B. Calcium dihydrate C. Pure gypsum D. None

11. Answer Key 1 D 2 A 3 D 4 A 5 B 6 B 7 D 8 C 9 A 10A