BPSC CCE Prelims
Nanotechnology Previous Year Questions (PYQs)
Practice solved questions for Nanotechnology with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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Which Material is used for smart film?
Detailed Explanation:
Smart films switch transparency when voltage is applied, requiring a material that is both electrically conductive and optically transparent.
Indium tin oxide (ITO) is a transparent conducting oxide used in smart films, touchscreens, and LCDs. Calcium carbonate is a non-conductive filler in plastics. Zinc chloride is used in batteries, not films. Silica is an insulator used in glass.
Light weight bullet proof helmets and jackets use which of the following fibres for their production?
Detailed Explanation:
Kevlar is a synthetic aramid fibre developed by DuPont in 1965, known for its extremely high tensile strength (5 times stronger than steel by weight) and low weight.
Its unique properties include bullet energy absorption and dispersion, flexibility, heat resistance, and fire resistance, making it the preferred material for lightweight bulletproof helmets and jackets. Terylene and Nylon lack the necessary impact resistance for ballistic protection.
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