Inorganic Materials of Industrial Importance — DU Physical Science courses pertaining to Chemistry Previous Year Question Papers

Attempt four questions in all. 1. (1) Fill in the blanks: (a) Ceramics is a type of .. (b) TiOz is an example of • (c) Urea is an example of a fertilizer. • (d) "Nutrients which are required in very small quantity by plants are called.... (e) Photosensitive glasses are sensitive in .. region. (ii) True or False: • (a) Presence of metallíc powders such as Sn, Zn and Al. etc. makes paint heat resistance. (b) Fiber glass can neither be spun into yarn nor gathered into a mat. (C) Fertilizers are used to manage pests in the crop. (d) Plasticizers in duces cracking in the paint. (e) Use of fertilizers leads to water pollution. (il) Define pigment with one example. (iv) What is the composition of borosilicate glass and where it is used ? (v) Name the raw material used for the manufacturing of Portland cement. (t) Differentiate between the following (any two : (a) Photosensitive and Photochromic glass (b) Pigment volume concentration and Critical pigment volume concentration. (C) Chemical vapour deposition and Physical vapour deposition method of surface coating. (it) Define thinnér and plasticizer. Also mention their role in the formulation of paint. (iit) How will you differentiate between porous and non-porous ceramics. Mention the important properties of ceramics which makes it useful for building construction. (1) Briefly describe the environmental impact of using fertilizers in farming. (i) Define ceramics and explain that why do we need to glaze the -ceramic products? (it) Write down the general characteristics of a good paint. 4. (i) "Slag is an eco-friendly cement". Justify the given statement. .. (i) What is the role of Nitrogen, Potassium and Phosphorous as a plant nutrient? (iii) What are the different constituents of paint? Write a brief note. (i) How does urea function as an effective fertilizer for plants? Give one method for the manufacture of urea. (ii) What is the importance of applying surface coating to the objects? Discuss the process of carburizing. : (iii) Define the term Cement. What is the composition of Pozzolana cement ? • (i) What do you. mean by fertilizer? Why do we need to add them to the soil ? (it) What is the composition of the Lead glass and Fluorosilicate glass? Write their uses • (iii) What do you mean by Emulsion paint? Write its different constituents and advantages.