Electric bulbs are made of _______________ glass ?

Related Mcqs:

1. Commonly used glass is known as the _______________ glass?

   A. Flint
   B. Hard
   C. Pyrex
   D. Soda

2. Coloured glass is obtained by mixing of colored salts. Addition of ___________________ oxide is done to impart greenish blue color to the glass?

   A. Chromium
   B. Arsenic
   C. Copper
   D. Manganese

3. Laboratory glass wares which reacts with hydrofluoric acid, are made of the ______________ glass?

   A. Lead
   B. Borosilicate
   C. Soda lime
   D. Alkali silicate

4. ___________________ glass is used for the manufacture of optical glass ?

   A. Pyrex
   B. Soda
   C. Flint
   D. Crooke’s

5. Type of glass used in optical work is the ___________________ glass?

   A. Soda-lime
   B. Fibre
   C. Lead
   D. Borosilicate

6. The type of high refractive index glass used in optical instruments is _____________ glass?

   A. Pyrex
   B. Flint
   C. Crookes
   D. None of these

7. Co-efficient of thermal expansion of glass is decreased by the addition of _______________ during its manufacture?

   A. CaO
   B. MnO2
   C. ZnO
   D. FeS

8. Blue colour is imparted to glass by the addition of__________________?

   A. FeSO4
   B. PbO
   C. CaO
   D. NaOH

9. Which of the following is not a raw material used for the manufacture of ordinary glass ?

   A. Iron oxide
   B. Soda ash
   C. Limestone
   D. Silica

10. The major constituents of glass are____________________?

    A. Lime, clay and soda ash
    B. Sand, lime and soda ash
    C. Silica, alumina and clay
    D. Silica, alumina and soda ash