Which form of silica has the highest specific gravity ?

Related Mcqs:

1. Specific gravity on API scale is given by the relation (where, G = specific gravity at 15.5°C) ?

   A. °API = 200(G – 1)
   B. °API = (141.5/G) – 131.5
   C. °API = (140/G) – 130
   D. °API = 145 – (145/G)

2. One of the specific gravity scales is “Brix” (used specifically for sugar solution). It is defined as ______________?

   A. Brix = (400/G) – 400
   B. Brix = 200 (G-1)
   C. Brix = 145 – (145/G)
   D. None of these

3. An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________?

   A. 0.2500
   B. 0.2528
   C. 0.5000
   D. 0.5055

4. Silica bricks are never used for lining the_________________?

   A. Beehive coke ovens
   B. By-product coke ovens
   C. Dome of blast furnace stoves
   D. Roof of open hearth furnace

5. Addition of zircon to silica refractory brick improves its_________________?

   A. Crushing strength
   B. Resistance to slag attack
   C. Both A. and B.
   D. Neither A. nor B.

6. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of ______________ °C?

   A. 770
   B. 570
   C. 270
   D. 70

7. °API gravity of water at N.T.P. is about__________________?

   A. 0
   B. 1
   C. 10
   D. 100

8. Which of the following expressions defines the Baume gravity scale for liquids lighter than water ?

   A. °Be = (140/G) – 130
   B. °Be = 200(G-1)
   C. °Be = 145 – (145/G)
   D. °Be = (400/G) – 400

9. Which of the following expressions defines the Baume gravity scale for liquids heavier than water ?

   A. (141.5/G) – 131.5
   B. 145 – (145/G)
   C. 200 (G-1)
   D. (400/G) – 400

10. Which of the following gravity scales is used exclusively for liquids heavier than water ?

    A. Baume scale
    B. Twaddell scale
    C. API scale
    D. None of these