A. Modify setting time
B. Modify setting expansion
C. Modify strength
D. Decrease the porosity
Related Mcqs:
- The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?
A. Alpha – hemihydrates
B. Beta – hemihydrates
C. Calcium sulphate dihydrate
D. Orthorhombic anhydrate - Accelerators and retarders are used with gypsum products mainly to control_______________?
A. Setting time
B. Setting expansion
C. Hardness of the set product
D. None of the above - Quartz is added to gypsum bonded investment to______________?
A. Increase the strength
B. Counter balance contraction of gypsum during heating
C. aid in hygroscopic expansion
D. Increase the shelf life of investment - Contraceptive action of combined pill is mainly due to_______________?
A. Decrease in tubal motility
B. Prevents the fertilization
C. Prevents the implantation of fertilized egg
D. Inhibits ovulation - R-RNA is mainly produced mainly in___________?
A. Nucleus
B. Nucleolus
C. Ribosome
D. Endoplasmic reticulum - The most commonly used accelerator in gypsum product is___________________?
A. Sodium fluoride
B. Potassium fluoride
C. Potassium sulfate
D. Aluminium sulfate - ADA specification number of gypsum products are described under____________?
A. 1
B. 4
C. 12
D. 25 - The function of 2% potassium sulphate in a gypsum product is_____________?
A. To regulate the setting expansion
B. Regulate setting time
C. Acts as retarder
D. None - As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
A. 0.05
B. 0.10
C. 0.15
D. 0.20 - The setting expansion of gypsum products can be reduced by________________?
A. Increased spatulation
B. Adding potassium sulfate
C. Less water powder ratio
D. Allowing setting under water
