UPSC CSE Prelims
Advanced Materials Previous Year Questions (PYQs)
Practice solved questions for Advanced Materials with detailed step-by-step solutions, key insights, and trend analysis for UPSC CSE PRELIMS.
Solved Previous Year Questions
Filter & practice questions topic-wise
Consider the following statements:
Statement I: Some rare earth elements are used in the manufacture of flat television screens and computer monitors.
Statement II: Some rare earth elements have phosphorescent properties.
Which one of the following is correct in respect of the above statements?
Detailed Explanation:
Rare Earth Elements (REEs) such as Europium, Terbium, and Yttrium are widely used in modern display technologies.
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Statement I is Correct: Some rare earth elements are used in flat TV screens and computer monitors.
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Statement II is Correct: These elements possess phosphorescent properties, meaning they can absorb energy and emit light.
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Statement II explains Statement I because these phosphorescent properties help produce bright, vibrant, and accurate colors in display screens.
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Therefore, Option A is the correct answer.
Statement-wise Analysis
| Statement | Status | Explanation |
|---|---|---|
| Statement I: REEs are used in flat TV screens and monitors | ✅ Correct | Europium, Terbium, and Yttrium are used in display technologies for color generation. |
| Statement II: Some REEs have phosphorescent properties | ✅ Correct | These elements can emit visible light after absorbing energy. |
| Relationship | ✅ Correct | Phosphorescence is the reason REEs are valuable in screens and monitors. |
Rare Earth Elements (REEs)
What are Rare Earth Elements?
Rare Earth Elements are a group of 17 metallic elements consisting of:
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15 Lanthanides
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Scandium
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Yttrium
Important Applications
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Flat-screen TVs and monitors
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Smartphones
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Electric Vehicles (EVs)
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Wind turbines
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Defence equipment
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Medical imaging devices
Phosphorescence
Phosphorescence is the ability of a material to:
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Absorb energy
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Store it temporarily
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Emit light gradually
This property helps create:
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Bright displays
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High color accuracy
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Better screen efficiency
Important REEs Used in Displays
| Element | Use |
|---|---|
| Europium | Red color phosphors |
| Terbium | Green color phosphors |
| Yttrium | Display and LED phosphors |
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Common questions about Advanced Materials in UPSC CSE PRELIMS