Physical Science for Home Science — DU B.Sc. (Hons.) Home Science Previous Year Question Papers

1. (a) Define the following terms: (5 × 1.5 = 7.5) i. Polymerization ii. Addition polymer ili. Essential Amino Acids iv. Alpha (a)-helix structure v. Fertilizer (b) How do amino acids link together to form proteins, and what type of bond is involved in this process? Explain it with a chemical reaction. (3) (c) What is mutarotation in carbohydrates? Explain with reaction. (4.5) 2. (a) What is the difference between thermoplastic and thermosetting polymers? Give one example for each type of polymer. (4) (b) What is indigo dye? Draw its chemical structure and mention its uses. (4) (c) Differentiate between essential and non-essential fatty acids. (4) (d) Write the structure and cleansing action of soap. (3) 3. (a) Write the characteristics of metal. Write any two alloys of copper. (4) (b) Define atom economy. Calculate atom economy of the following reaction: (4) (c) Explain the classification of carbohydrates on the basis of their chemical composition, with suitable examples. (5) (d) Write the important examples of Green Chemistry. (2) 4. (a) Describe any two lens defects and discuss the methods to correct them. (5) (b) Explain echo and the factors affecting it. How is it different from reverberation? (5) (c) What is a LASER? Explain any three important properties that distinguish lasers from ordinary light. (5) 5. (a) What are p and n type semiconductors? Discuss the application of p-n junction diode as half wave rectifier. (5) (b) Define renewable energy. Discuss about various non-solar renewable energy sources. (5) (c) Describe the construction and working of an incandescent lamp. (5) 6. Write short note (any three) (5 x 3=15) a) LED b) Solar energy as renewable energy c) Geostationary satellites d) Amplitude modulation and Frequency modulation