UPSC Civil Services Mains 2018 Physics Paper I PDF

Central Government Jobs Other Jobs 2018

  • Year 2018
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages Hindi & English

Exam Details

Detail Information
Examination UPSC Civil Services Main Examination
Year 2018
Conducting Body UPSC
Paper Physics Paper - I
Subject Physics
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Descriptive / Subjective

This is the Physics Paper I from the UPSC Civil Services Main Examination held in 2018. The paper is designed to test candidates' in-depth knowledge of Physics concepts. It consists of 8 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. The total marks for the paper are 250, and candidates are allowed three hours to complete it. This paper is crucial for aspirants aiming to secure a good rank in the Civil Services.

Major Topics Covered

  • Central Force Field
  • Angular Momentum
  • Particle Dynamics
  • Classical Mechanics

Why This Paper is Important

  • Useful for UPSC Civil Services Main Examination 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 Examination 2017 Physics Paper I
  • UPSC Civil Services Main Examination 2019 Physics Paper I
  • UPSC Civil Services Main Examination 2018 General Studies Paper I
  • UPSC Civil Services Main Examination 2018 Physics Paper I Answer Key
  • UPSC Civil Services Mains Physics Syllabus
  • Classical Mechanics Syllabus for UPSC Mains
  • Electrodynamics Syllabus for UPSC Mains
  • UPSC Civil Services Mains Exam Pattern

Instructions

  • पुस्तिका के मुख-पृष्ठ पर निर्दिष्ट स्थान पर किया जाना चाहिए ।
  • प्राधिकृत माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे गए उत्तर पर कोई अंक नहीं मिलेंगे ।
  • बदि आवश्यक हो, तो उपपक्त औकडों का चयन करें तथा उनको निर्दिष्ट करें ।
  • जब तक उल्लिखित न हो, संकेत तथा शब्दावली प्रचलित मानक अर्थों में प्रयुक्त हैं ।
  • प्रश्मों के उत्तरों की गणना क्रमानुसार की जाएगी ।
  • यदि काटा नहीं हो, तो प्रश्न के उत्तर की गणना की जाएगी चाहे वह उत्तर अंशतः दिबा गया हो ।
  • प्रश्न-सह-उत्तर पुल्तिका 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.
  • I and 5 are compulsory and out of the remaining, any 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. Ĭ.

Questions (page 2)

Section A

Q1.

(a) यदि द्रव्यमान m का एक कण एक केन्द्रीय बल क्षेत्र f(r)\hatr में है, तो दर्शाइए कि उसका पथ एक समतल वक्र होना चाहिए, जहाँ \hatr एक स्थिति सदिश \vecr की दिशा में एक मात्रक (यूनिट) सदिश है।
If a particle of mass m is in a central force field f(r)\hatr, then show that its path must be a plane curve, where \hatr is a unit vector in the direction of position vector \vecr.

(b) जैसा कि आरेख में दिखाया गया है, नगण्य विस्तार का एक द्रव्यमान m का पिण्डक x-दिशा में वेग \vecv = v \hati के साथ निर्बाध खिसक रहा है । मूल-बिन्दु O के परित: उसका कोणीय संवेग \overrightarrowL_O और y-अक्ष पर बिन्दु A के परित: उसका कोणीय संवेग \overrightarrowL_A क्या हैं ?
A block of mass m having negligible dimension is sliding freely in x-direction with velocity \vecv = v \hati as shown in the diagram. What is its angular momentum \overrightarrowL_O about origin O and its angular momentum \overrightarrowL_A about the point A on y-axis ?

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Frequently asked questions

What is the name of the exam?

The exam is the UPSC Civil Services Main Examination.

What year is this question paper from?

This question paper is from the year 2018.

Who conducts the Civil Services Main Examination?

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

What is the subject of this paper?

This is Physics Paper I.

What is the maximum marks for Physics Paper I?

The maximum marks for Physics Paper I are 250.

What is the time allowed for Physics Paper I?

The time allowed for Physics Paper I is three hours.

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