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UPSC Civil Service Prelims Paper I 2021 (General Studies)
MCQ (Single Correct Answer)
+2
-0.66
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
Questions Asked from Electronics and Communication (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
UPSC Civil Service Subjects
History of India
Science and Technology
Ecology and Environment
Indian Polity and Governance
Evolution of the Constitution Salient Features of Indian Constitution Union and Its Territory Fundamental Rights Directive Principles of State Policy (DPSP) Fundamental Duties System of Governance Union Executive Union Legislature State Legislature and Executive Local Government Union Territories and Special Areas The Judiciary Constitutional and Non-Constitutional Bodies
Economy
Current Affairs
Comprehension
Basic Numeracy
Logical Reasoning and General Mental Ability
Data Interpretation and Sufficiency