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Question No. 185Interactive Test Mode
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Q185. With reference to technology for solar power production, consider the following statements: 1. Photovoltaics is a technology that generates electricity by direct conversion of light into electricity, while ‘Solar Thermal’ is a technology that utilises the Sun’s rays to generate heat which is further used in the electricity generation process. 2. Photovoltaics-generates Alternating Current (AC), while Solar Thermal generates Direct Current (DC). 3. India has a manufacturing base for Solar Thermal technology, but not for photovoltaics. Which of the statements given above is/are correct?

With reference to technology for solar power production, consider the following statements:

  1. Photovoltaics is a technology that generates electricity by direct conversion of light into electricity, while ‘Solar Thermal’ is a technology that utilises the Sun’s rays to generate heat which is further used in the electricity generation process.
  2. Photovoltaics-generates Alternating Current (AC), while Solar Thermal generates Direct Current (DC).
  3. India has a manufacturing base for Solar Thermal technology, but not for photovoltaics. Which of the statements given above is/are correct?
Select the correct option below (or cross out options to eliminate)

Official Answer Key & Detailed Solution

Ready to check the official UPSC Answer Key?

Click any option above to test yourself under exam conditions, or reveal the explanation directly.

Official UPSC Answer KeyUPSC Prelims 2014 • Science and Technology

Correct Answer: Option (A) — 1 only

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is correct: Solar Photovoltaics directly convert photons to electricity via the photoelectric effect, whereas Concentrated Solar Thermal uses solar heat to drive a steam turbine generator.

Statement 2 is incorrect: Photovoltaic cells generate Direct Current (DC), which is converted to AC via an inverter. Solar thermal systems drive conventional turbine alternators producing Alternating Current (AC).

Statement 3 is incorrect: India has manufacturing capabilities for both Solar Photovoltaics and Solar Thermal technologies.

Elimination Heuristic & Exam Approach

Statement 2 contains a classic UPSC swap: PV produces DC natively, while rotary thermal generators produce AC natively.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2014 (Q185)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — 1 only

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Frequently Asked Questions — UPSC Prelims 2014 Q185

What is the official answer for UPSC Prelims 2014 GS Paper I Question 185 (Science and Technology)?

The official UPSC answer key for this 2014 Science and Technology (Health & Medicine) question is Option (A): "1 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2014 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Statement 2 contains a classic UPSC swap: PV produces DC natively, while rotary thermal generators produce AC natively.

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