Modiffiers are added to gypsum mainly to_______________?

Related Mcqs:

1. 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

2. 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

3. 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

4. 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

5. R-RNA is mainly produced mainly in___________?

   A. Nucleus
   B. Nucleolus
   C. Ribosome
   D. Endoplasmic reticulum

6. The most commonly used accelerator in gypsum product is___________________?

   A. Sodium fluoride
   B. Potassium fluoride
   C. Potassium sulfate
   D. Aluminium sulfate

7. ADA specification number of gypsum products are described under____________?

   A. 1
   B. 4
   C. 12
   D. 25

8. 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

9. 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

10. 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