UPSC Civil Services Physics Paper II 2021 Question Paper PDF

Central Government Jobs Other Jobs 2021

  • Year 2021
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages English & Hindi

Exam Details

Detail Information
Examination UPSC Civil Services Main Exam
Year 2021
Conducting Body UPSC
Paper Physics Paper-II
Subject Physics
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Mixed

This is the Physics Paper-II from the UPSC Civil Services Main Examination held in 2021. The paper carries a maximum of 250 marks and is allotted a duration of three hours. It consists of eight questions divided into two sections, with candidates required to answer five questions in total. Questions 1 and 5 are compulsory, and at least one question must be attempted from each section. This paper is crucial for aspirants aiming to secure a position in the Civil Services, providing a detailed look at the expected knowledge and application of physics principles at the main examination level.

Major Topics Covered

  • Zeeman effect
  • Hydrogen atom
  • Potential energy
  • Bohr radius
  • Potential barrier
  • Transmission coefficient
  • Hyperbolic functions
  • Exponential functions

Why This Paper is Important

  • Useful for UPSC Civil Services Main Exam preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

Related Resources

  • UPSC Civil Services Main Exam 2021 Physics Paper-I
  • UPSC Civil Services Main Exam 2020 Physics Paper-II
  • UPSC Civil Services Main Exam 2021 General Studies Paper-I
  • UPSC Civil Services Main Exam 2021 Physics Paper II Answer Key
  • UPSC Civil Services Main Exam Physics Syllabus
  • UPSC Mains Physics Paper II Syllabus
  • UPSC Civil Services Main Exam Pattern
  • UPSC Mains Physics Paper II Exam Pattern

Instructions

  • पुस्तिका के मुखपृष्ठ पर निर्दिष्ट स्थान पर किया जाना चाहिए ।
  • प्राधिकृत माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे गए उत्तर पर कोई अंक नहीं मिलेंगे ।
  • यदि आवश्यक हो, तो उपयुक्त आँकड़ों का चयन कीजिए तथा उनको निर्दिष्ट कीजिए ।
  • जब तक उल्लिखित न हो, संकेत तथा शब्दावली प्रचलित मानक अर्थों में प्रयुक्त हैं ।
  • प्रश्नों के उत्तरों की गणना क्रमानुसार की जाएगी ।
  • यदि काटा नहीं हो, तो प्रश्न के उत्तर की गणना की जाएगी चाहे वह उत्तर अंशतः दिया गया हो ।
  • प्रश्न-सह-उत्तर पुस्तिका में खाली छोड़ा हुआ पृष्ठ या उसके अंश को स्पष्ट रूप से काटा जाना चाहिए ।

  • There are EIGHT questions divided in TWO SECTIONS and printed both in HINDI and in ENGLISH.
  • Candidate has to attempt FIVE questions in all.
  • Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE question from each Section.
  • The number of marks carried by a question/part is indicated against it.
  • Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided.
  • No marks will be given for answers written in a medium other than the authorized one.
  • Assume suitable data, if considered necessary, and indicate the same clearly.
  • Unless and otherwise indicated, symbols and notations carry their usual standard meanings.
  • Attempts of questions shall be counted in sequential order.
  • Unless struck off, attempt of a question shall be counted even if attempted partly.
  • Any page or portion of the page left blank in the Question-cum-Answer Booklet must be clearly struck off.

Questions (page 2)

Section A

Q1.

(a) 400 nm तरंग-दैर्घ्य की स्पेक्ट्रम रेखा में देखे जाने के लिए जीमॉन प्रभाव के लिए आवश्यक न्यूनतम चुंबकीय क्षेत्र का पता लगाएँ जब कि एक स्पेक्ट्रोमीटर जिसका विभेदन 0.010 nm है, का उपयोग किया जाता है । उत्तर को निकटतम उच्च पूर्णांक में लिखें ।
Find the minimum magnetic field needed for the Zeeman effect to be observed in a spectral line of 400 nm wavelength when a spectrometer whose resolution is 0.010 nm is used. Write the answer in the nearest high integer.

(b) हाइड्रोजन परमाणु की 1s अवस्था में इलेक्ट्रॉन के लिए सामान्यीकृत तरंग फलन निम्नलिखित है:
\psi_{100} = \frac{1}{\sqrt{\pi a_0^3}} e^{-r/a_0}, \text{ जहाँ } a_0 = \frac{\hbar^2}{me^2}
बोहर त्रिज्या है। इस अवस्था में स्थितिज ऊर्जा के अपेक्षित मान की गणना कीजिए।
Normalised wave function of hydrogen atom for 1s state is
\psi_{100} = \frac{1}{\sqrt{\pi a_0^3}} e^{-r/a_0}, where a_0 = \frac{\hbar^2}{me^2}
being the Bohr radius. Calculate the expectation value of potential energy in this state.

(c) 25 eV ऊंचाई और 0.5 nm चौड़ाई के विभव रोध पर 12 eV इलेक्ट्रॉन का एक किरण-पुंज आपतित होता है । संचरण गुणांक की गणना कीजिए ।
A beam of 12 eV electron is incident on a potential barrier of height 25 eV and width 0.05 nm. Calculate the transmission coefficient.

Question paper preview

Scanned pages 1–2 for reference. Download the official PDF for the full paper.

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UPSC Civil Services Main Exam 2021 Physics Paper II page 1 scan showing exam header, marks, time, and instructions in Hindi and English. PDF download.
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UPSC Civil Services Main Exam 2021 Physics Paper II page 1 scan showing exam header, marks, time, and instructions in Hindi and English. PDF download.

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Frequently asked questions

What is the name of the exam?

The exam is the UPSC Civil Services Main Examination.

What is the subject of this paper?

This paper is Physics, specifically Paper-II.

What is the maximum mark for Physics Paper-II?

The maximum marks for Physics Paper-II is 250.

What is the time allowed for this paper?

The time allowed for Physics Paper-II is three hours.

Who conducts the Civil Services Main Examination?

The examination is conducted by the UPSC (Union Public Service Commission).

How many questions are there in Physics Paper-II?

There are eight questions in total, divided into two sections.

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