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**Subject: Material Science  
Time: 3 Hours**  
**Max Marks: 30**

1. Discuss the reasons for selecting a polymer for any part of engine, referring to load and temperature conditions.

2. What is the role of alloying elements in the development of steels used for modern cars?

3. Explain the differences between steel and cast iron, focusing on their composition and properties.

4. Describe the process of making a composite material with a thermosetting matrix and a fibrous reinforcement.

5. Compare the properties of carbon fiber and glass fiber as reinforcing materials in composites.

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Would you like me to address any specific questions or provide a detailed solution for any part of this exam? Here are some related questions you might find useful:

1. What are the main differences between thermosetting and thermoplastic polymers?
2. How do alloying elements affect the mechanical properties of steel?
3. What are the advantages and disadvantages of using carbon fiber in composites?
4. How is cast iron different from steel in terms of microstructure?
5. What are the key considerations when designing a composite material?

**Tip:** Always ensure to cross-check the material selection criteria with the specific application requirements to ensure optimal performance.

Feel free to ask for more details or any specific question you have!

Explore the principles of material science with a focus on polymer selection, alloying elements in steels, and composite materials. This problem examines the properties and applications of polymers and alloys, comparing fiber reinforcements such as carbon fiber and glass fiber. Suitable for advanced high school and college students.

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