Explanation
- A
Theory of relativity
The theory of relativity made Einstein famous but did not win his Nobel Prize. Relativity is the prestige distractor, not the keyed award.
- B
Theory of photoelectricity
(b) Official key: Einstein’s Nobel Prize (1921, awarded 1922) was for the law of the photoelectric effect. Among relativity, photoelectricity, specific heats and Brownian motion, photoelectricity is the official prize theory.
- C
Theory of specific heats
Work on specific heats is part of Einstein’s early quantum papers, not the Nobel citation. Specific heat is not the key.
- D
Theory of Brownian motion
Einstein explained Brownian motion (1905), confirming atoms; that paper did not carry the Nobel. Perrin’s experiments completed that story. Brownian motion is not the keyed prize.
Summary. Official key is (b). Einstein’s Nobel is for the photoelectric effect, not relativity. Specific heats and Brownian motion are other 1905-era contributions. Keep photoelectricity. The official letter is (b).
Same topic · past papers
UPPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
-
2023 · Q122 · UPPGS
Match List-I (Theories of Population) with List-II (Propounders of Theories) and select the correct answer using the code given below. List-I A. Optimum Population Theory B. Social Mal-adjustment Theory C. Demographic Transition Theory D. Population-Food Supply Relationship Theory List-II 1. Thompson 2. Malthus 3. Edwin Cannan 4. Henry George -
2022 · Q78 · UPPGS
T. Malthus propounded one of the most famous theories, called 'The Malthusian Theory' which is related to. Select the correct answer from the code given below: