Physics: Electricity and Magnetism: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question on Physics: Electricity and Magnetism (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 2006Science and Technology · Physics: Electricity and Magnetism
Q1. Which one of the following is printed on a commonly used fluorescent tube light?
Explanation
Fluorescent tube lights are commonly rated by their color temperature, which is measured in Kelvin (K). Color temperature refers to the hue of light emitted by the tube and it is based on the concept of a black-body radiator.
Option (c) is correct: The color temperature of fluorescent tube lights is typically around 6500 K, which corresponds to "daylight" and provides a bright white light. Options (a), (b) and (d) are incorrect:
Color temperatures as low as 220 K or 273 K are not suitable for lighting as they are far too low. 273 K represents a color temperature lower than a standard incandescent bulb (around 2700 K). A 9000 K light would appear slightly blue and is not commonly used for general room lighting, but rather for specialized purposes like aquarium lighting.
Answer key for these questions
Q
UPSC year
Correct answer
1
2006
(c) 6500 K
Frequently asked questions
How many previous year UPSC questions are there on Physics: Electricity and Magnetism?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Physics: Electricity and Magnetism (Science and Technology), asked from 1996 to 2006. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Physics: Electricity and Magnetism?
Questions on Physics: Electricity and Magnetism (Science and Technology) are available for 6 years, from 1996 to 2006. Use the Year filter to practise a single paper.
