1. Gravel is a type of:
a) Rounded aggregate
b) Angular aggregate
c) Flaky aggregate
d) Irregular aggregate
Explanation: All gravel particles have an irregular shape and sharp edge. Sand has a rounded shape. Laminated rocks have flaky shape and crushed rocks have an angular shape.
2.Glass is a mixture of:
a) Non-metallic silicates
b) Metallic silicates
c) Metallic acetates
d) Non-metallic acetates
Explanation: Glass is a solidified super-cooled solution of various metallic silicates having infinite viscosity.
3. How many different categories of glass are there?
a) 5
b) 4
c) 2
d) 3
Explanation: For the purpose of classification, glass can be grouped into 3 categories: Soda-lime glass, Potash-lime glass and Potash-lead glass.
4. Which of the following types of glass accounts for about 90% of manufactured glass?
a) Potash-lime glass
b) Soda-lime glass
c) Potash-lead glass
d) Soda-lead glass
Explanation: Soda-lime glass accounts for about 90% of the manufactured glass. It is inexpensive, chemically stable, hard and workable.
5. Glass is not a single compound.
a) True
b) False
Explanation: It is a not a single compound and it is very difficult to give any particular chemical formula for it.
6. The two types of soda-lime glass- flat glass and container glass differ in:
a) Application and production method
b) Application and chemical composition
c) Production method and chemical composition
d) Application, production method and chemical composition
Explanation: They differ in the application (flat glass is used for window panes and container glass for glass containers), production method (float process is used for windows and pressing for containers), chemical composition (flat glass has higher magnesium oxide and sodium oxide than container glass).
7. Which type of glass is used in the manufacture of artificial gems, bulbs, lenses, etc?
a) Soda-lime glass
b) Special glass
c) Potash-lead glass
d) Common glass
Explanation: Potash-lead glass is a mixture of potassium silicate and lead silicate. It possesses a bright lustre and has a great refractive power, hence it is used in the manufacture of artificial gems, bulbs, lenses, etc.
8. What changes are observed when a glass is heated?
a) It becomes softer
b) It bursts
c) It solidifies
d) It disintegrates
Explanation: It becomes softer and softer with a rise in temperature and is ultimately transformed into a mobile liquid.
9. How many commercial forms of glass are there for various engineering and industrial requirements?
a) 8
b) 11
c) 9
d) 10
Explanation: There are 11 forms of special varieties of glass for commercial purposes. They are sheet glass, plate glass, coloured glass, wired glass, structural glass, laminated glass, bullet-proof glass, fibre glass, foam glass, flint glass and soluble glass
10. Chromatic glass is used in:
a) ICU and meeting rooms
b) Aquariums
c) Mobile screen protectors
d) Floors
Explanation: It is used in ICU, meeting rooms as it can control the transparent efficiency of glass and protects the interiors from day light.