Explanation
1. The question asks which polymer is widely used for making bullet proof material.
2. Bullet proof materials, often used in vests and vehicle armor, need to be strong, tough, and able to absorb and dissipate the energy of a projectile.
3. While several materials contribute to modern body armor (like ceramics), high-strength synthetic fibers are key components.
4. Polyamides, specifically aromatic polyamides known as aramids (e.g., Kevlar), are widely used due to their high tensile strength and lightweight properties.
5. Polycarbonates are strong, transparent plastics often used for bullet-resistant glass or visors, but high-strength fibers like aramids (a type of polyamide) are more common for flexible bulletproof vests.
6. Polyvinyl chloride (PVC) and Polyethylene (standard types) do not possess the necessary strength and impact resistance for effective bulletproofing.
7. Given the options, Polyamides (specifically aramids) or Polycarbonates (for rigid applications) are relevant. Aramids (Polyamides) are very common in vests. Polycarbonates are also used. However, often high-strength fibers like Kevlar (an aramid, which is a polyamide) are synonymous with bulletproof vests. Some sources might also list Polycarbonates. Given the common usage in vests, Polyamides (aramids) are a strong candidate. *Self-correction: While aramids are polyamides, polycarbonates are also known for their impact resistance and use in bullet-resistant applications. Let's re-evaluate. Kevlar is an aramid fiber (polyamide). Lexan is a polycarbonate used in bullet-resistant glass. Considering 'material' broadly, both could fit. However, for vests, aramids (polyamides) are primary. Let's check if Polycarbonates are considered more 'widely used'. Polycarbonates are very common in bullet-resistant windows/shields. Given the options, and the common knowledge around Kevlar vests, Polyamides seems plausible. However, Polycarbonates are also known for this property. Let's assume the question refers to the broad category including bullet-resistant glass/shields.* Final choice likely depends on UPSC's intended scope. Assuming a broad scope including rigid materials, Polycarbonates (D) is a strong contender. If focusing on vests, Polyamides (B) would be better.