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Government recruitment · scientific officer / atomic energy · BARC

BARC OCES/DGFS Mock Tests, Syllabus & Complete Exam Guide

BARC Orientation Course for Engineering Graduates and Science Postgraduates (OCES) / DAE Graduate Fellowship Scheme (DGFS). Practise 35 full-length mock tests on the official pattern, drill every topic, and get the eligibility, syllabus, cut-off, rank and college details you need — all in one place.

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BARC OCES/DGFS at a glance

Sections
Core Engineering · Maths · Aptitude · Applied Science
Online test
100 questions · 300 marks · 120 min
Marking
+3 correct · −1 wrong
Stages
Online test / GATE → Interview
ModeOnline (computer-based) test → interview (selection via GATE score or the online test)
FrequencyUsually once a year
LanguagesEnglish
By the ExamguruX Editorial TeamReviewed for pattern accuracy against BARCLast updated 2 September 2026

BARC OCES/DGFS full-length mock tests

Attempt 35 full-length BARC OCES/DGFS mock tests built on the official 52-question pattern. The first mock is free — every test comes with instant results and a step-by-step solution for each question.

BARC OCES/DGFS Full Mock Test 01

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52 Qs · 156 marks120 min11.3K attemptsModerate
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BARC OCES/DGFS Full Mock Test 02

52 Qs · 156 marks120 min14.6K attemptsHard
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BARC OCES/DGFS Full Mock Test 03

52 Qs · 156 marks120 min18.0K attemptsModerate
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BARC OCES/DGFS Full Mock Test 04

52 Qs · 156 marks120 min21.3K attemptsHard
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BARC OCES/DGFS Full Mock Test 05

52 Qs · 156 marks120 min24.6K attemptsEasy
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BARC OCES/DGFS Full Mock Test 06

52 Qs · 156 marks120 min27.9K attemptsHard
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BARC OCES/DGFS Full Mock Test 07

52 Qs · 156 marks120 min31.2K attemptsEasy
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BARC OCES/DGFS Full Mock Test 08

52 Qs · 156 marks120 min34.6K attemptsModerate
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BARC OCES/DGFS Full Mock Test 09

52 Qs · 156 marks120 min37.9K attemptsEasy
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BARC OCES/DGFS topic-wise tests & syllabus

120 topic tests across 4 subjects — a focused set of 15 tests for every topic in the BARC OCES/DGFS syllabus, tagged with approximate exam weightage so you practise where the marks are.

120 topic-wise tests · 15 per topic across 4 subjects. Pick a subject, expand a topic, and start drilling.

Mechanics & Materials — Test 01

12 Qs · 36 marks15 min74.4K attemptsModerate
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Mechanics & Materials — Test 02

12 Qs · 36 marks15 min97.6K attemptsEasy
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Mechanics & Materials — Test 03

20 Qs · 60 marks24 min121K attemptsHard
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Mechanics & Materials — Test 04

12 Qs · 36 marks15 min24.1K attemptsModerate
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Mechanics & Materials — Test 05

12 Qs · 36 marks15 min47.3K attemptsEasy
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Mechanics & Materials — Test 06

20 Qs · 60 marks24 min70.5K attemptsHard
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Mechanics & Materials — Test 07

12 Qs · 36 marks15 min93.8K attemptsModerate
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Mechanics & Materials — Test 08

12 Qs · 36 marks15 min117K attemptsEasy
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Mechanics & Materials — Test 09

20 Qs · 60 marks24 min20.2K attemptsHard
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Mechanics & Materials — Test 10

12 Qs · 36 marks15 min43.5K attemptsModerate
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Mechanics & Materials — Test 11

12 Qs · 36 marks15 min66.7K attemptsEasy
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Mechanics & Materials — Test 12

20 Qs · 60 marks24 min89.9K attemptsHard
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Mechanics & Materials — Test 13

12 Qs · 36 marks15 min113K attemptsModerate
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Mechanics & Materials — Test 14

12 Qs · 36 marks15 min16.4K attemptsEasy
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Mechanics & Materials — Test 15

20 Qs · 60 marks24 min39.6K attemptsHard
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BARC OCES/DGFS sample questions

A few real BARC OCES/DGFS questions with answers and step-by-step solutions, in the exact style of the full mock tests.

Core Engineering (Discipline)Sample 1

The SI unit of stress is the same as the unit of:

  • A.Force
  • B.Pressure
  • C.Strain
  • D.Work

Solution: Stress is force per unit area (N/m^2 = pascal), the same unit as pressure. Strain is dimensionless and work is measured in joules.

Engineering MathematicsSample 2

The derivative of sin(x) with respect to x is:

  • A.cos(x)
  • B.-cos(x)
  • C.-sin(x)
  • D.tan(x)

Solution: By standard differentiation rules, d/dx[sin(x)] = cos(x).

Analytical & Numerical AptitudeSample 3

A shirt priced at Rs 1200 is offered at a 25% discount. Its sale price is:

  • A.Rs 800
  • B.Rs 900
  • C.Rs 950
  • D.Rs 1000

Solution: Discount = 25% of 1200 = 300, so the sale price = 1200 - 300 = Rs 900.

Applied Science & PhysicsSample 4

Nuclear fission is a process in which:

  • A.Two light nuclei combine to form a heavier nucleus
  • B.A heavy nucleus splits into two or more lighter nuclei
  • C.A nucleus emits a gamma ray without changing
  • D.Electrons are stripped from an atom

Solution: In nuclear fission a heavy nucleus such as uranium-235 splits into two or more lighter nuclei, releasing energy and neutrons. Combining light nuclei is fusion.

About the BARC OCES/DGFS exam

A national recruitment exam through which the Bhabha Atomic Research Centre selects engineering graduates and science postgraduates as trainee Scientific Officers for the Department of Atomic Energy — via the one-year OCES orientation course or the DGFS fellowship route into a career across DAE units such as BARC, NPCIL and IGCAR.

What is the BARC OCES/DGFS exam?

BARC OCES/DGFS is the Bhabha Atomic Research Centre's recruitment channel for trainee Scientific Officers in the Department of Atomic Energy (DAE). Selected candidates join either the one-year Orientation Course for Engineering Graduates and Science Postgraduates (OCES) at the BARC Training School, or the DAE Graduate Fellowship Scheme (DGFS) under which they complete an M.Tech at a designated institute with a DAE stipend before absorption. Successful trainees are posted as Scientific Officers across DAE units such as BARC, the Nuclear Power Corporation of India (NPCIL) and the Indira Gandhi Centre for Atomic Research (IGCAR).

Selection begins either with the BARC online test or with a valid GATE score in the relevant discipline. The online test is a 120-minute, 100-question paper carrying 300 marks, spanning the candidate's core engineering discipline along with engineering mathematics, analytical and numerical aptitude, and applied science with a distinct atomic-energy flavour. Because it has negative marking, accuracy under time matters; shortlisted candidates then face an interview that decides final selection.

How to clear BARC OCES/DGFS

Your core engineering discipline carries the most weight, so build strong cross-branch fundamentals — mechanics, thermodynamics, fluid mechanics, electrical basics and materials — alongside the depth of your own branch. Engineering mathematics is high-return and stable: drill calculus, linear algebra, differential equations, probability and vectors until they are quick and reliable.

The analytical and numerical aptitude section rewards speed on arithmetic, ratio, time-speed-distance, data interpretation and reasoning. The applied-science section carries an atomic-energy flavour, so be comfortable with nuclear reactors and the PHWR, fission, isotopes, uranium and thorium, radiation and the story of India's programme under Homi Bhabha, in addition to general physics. Because every wrong answer costs a mark, attempt with discipline, and take full-length timed mocks to build the stamina the 120-minute paper demands. Finally, prepare thoroughly for the interview, which decides the final selection.

BARC OCES/DGFS eligibility & exam pattern

Check whether you meet the BARC OCES/DGFS eligibility criteria and understand exactly how the paper is structured and marked before you plan your preparation.

Eligibility criteria

Nationality
Indian citizen.
Qualification
A B.E./B.Tech in an eligible engineering discipline, or an M.Sc. in an eligible science subject, with the minimum aggregate marks specified in the notification.
Minimum marks
Generally at least 60% aggregate in the qualifying degree, as specified by BARC for the relevant discipline.
Age
An upper age limit applies (typically around 26 years for the general category), with relaxation for reserved categories per government norms.
Selection route
Through the BARC online examination or a valid GATE score in the relevant discipline, followed by an interview.
DGFS
For DGFS, candidates pursue an M.Tech at a designated institute with a DAE stipend and are absorbed as Scientific Officers on completion.

Exam pattern & marking

SubjectQuestionsMarks
Core Engineering (Discipline)Cross-branch fundamentals — mechanics, thermodynamics, fluids, electrical, materials50150
Engineering MathematicsCalculus, linear algebra, differential equations, probability, vectors2060
Analytical & Numerical AptitudeArithmetic, ratio, speed-distance, data interpretation, reasoning1545
Applied Science & PhysicsNuclear reactors, fission, isotopes, radiation and general physics1545
Total100300

The BARC OCES/DGFS online test has 100 objective questions carrying 300 marks, to be answered in 120 minutes. Each correct answer earns 3 marks and each wrong answer carries a penalty of 1 mark; unanswered questions score zero. The paper is set at the level of an engineering graduate or science postgraduate and covers the candidate's core discipline along with engineering mathematics, analytical and numerical aptitude, and applied science with an atomic-energy flavour. Candidates who clear the online test (or who qualify through a valid GATE score) are shortlisted for an interview, and final selection as a trainee Scientific Officer is based on interview performance. On ExamguruX, each question is scored +3 with a 1-mark penalty for a wrong answer, mirroring the real marking, and every question has a worked solution.

Duration: 120 minutes (online test).

How to prepare for BARC OCES/DGFS

A fresher-friendly BARC OCES/DGFS roadmap — understand the paper first, follow a month-by-month plan, build a weekly routine and peak with reviewed full-length mocks.

Beginner-friendly roadmap

Your BARC OCES/DGFS plan: first day to exam day

Start with the paper structure, build concepts in layers, then use timed practice and review to turn preparation into a repeatable score.

Coverage4 subjects
Exam clock120 minutes (online test)
MarkingThe BARC OCES/DGFS online test has 100 objective questions carrying 300 marks, to be answered in 120 minutes. Each correct answer earns 3 marks and each wrong answer carries a penalty of 1 mark; unanswered questions score zero. The paper is set at the level of an engineering graduate or science postgraduate and covers the candidate's core discipline along with engineering mathematics, analytical and numerical aptitude, and applied science with an atomic-energy flavour. Candidates who clear the online test (or who qualify through a valid GATE score) are shortlisted for an interview, and final selection as a trainee Scientific Officer is based on interview performance. On ExamguruX, each question is scored +3 with a 1-mark penalty for a wrong answer, mirroring the real marking, and every question has a worked solution.

The first 12 weeks

A plan a fresher can actually follow

  1. Month 1

    Understand the paper and build your base

    Read the official pattern first, then make a realistic subject map for 4 subjects. Begin with Core Engineering (Discipline), Engineering Mathematics, Analytical & Numerical Aptitude. Focus on concepts before speed.

    Take one diagnostic topic test. Its purpose is to find gaps, not to judge your score.
  2. Month 2

    Finish the core syllabus through practice

    Cover the remaining syllabus, including Applied Science & Physics, while revising Month 1 every week. Move from untimed questions to short timed sets.

    Keep a single error log: concept missed, why it happened and the correct method.
  3. Month 3

    Build exam temperament with mocks

    Use the real exam time limit (120 minutes (online test)) in full-length practice. Review every mock longer than it took to attempt it; the review is where improvement happens.

    Turn each weak area from your error log into a 30–45 minute repair session.

Your repeatable week

The study loop that makes revision stick

  1. 1
    Learn

    Read one focused concept block and make a short revision sheet.

  2. 2
    Solve

    Immediately answer topic questions; do not wait until you have ‘finished’ the syllabus.

  3. 3
    Review

    Log mistakes by concept, not just by score. Revisit them after 2–3 days.

  4. 4
    Simulate

    Use a timed section or mock to practise decisions under the clock.

Mock-test ladder

Don’t start with a full mock every day

  • Month 1: topic tests after each completed concept.
  • Month 2: one timed sectional test each week, plus error-log revision.
  • Month 3: one or two full mocks weekly under the real 120 minutes (online test) clock.

BARC OCES/DGFS-specific priorities

What to focus on as you move through the plan

  1. 1

    Master your core discipline

    The discipline section carries the most marks. Build strong cross-branch fundamentals — mechanics, thermodynamics, fluids, electrical and materials — along with the depth of your own branch.

  2. 2

    Make Engineering Maths reliable

    Maths is high-return and stable. Drill calculus, linear algebra, differential equations, probability and vectors until they are fast and automatic.

  3. 3

    Build aptitude speed

    Practise arithmetic, ratio, time-speed-distance, data interpretation and logical reasoning so the numerical aptitude section becomes a quick, dependable source of marks.

  4. 4

    Learn the atomic-energy flavour

    Applied Science leans nuclear — reactors and the PHWR, fission, isotopes, uranium and thorium, radiation and India's three-stage programme — so pair general physics with atomic-energy topics.

  5. 5

    Respect the negative marking

    At −1 per wrong answer, blind guessing is costly. Attempt when you can eliminate to a confident choice, and leave questions you genuinely can't judge.

  6. 6

    Practise with full mocks and prep the interview

    Take full timed mocks to learn section balance and pacing over 120 minutes, review every miss, and prepare thoroughly for the interview that decides final selection.

Final 7 days

Revise your short notes and error log; do not begin major new topics.

Take only the number of mocks you can properly review; protect sleep and routine.

Confirm the official admit-card instructions, reporting time, centre and permitted items.

Want personal support?

Request an online trainer for your BARC OCES/DGFS preparation.

Get help with your study plan, difficult concepts and mock-test review, subject to trainer availability.

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BARC OCES/DGFS scoring & selection

Use this practice benchmark to understand score ranges, qualifying cut-offs and the selection stages for BARC OCES/DGFS. The conducting authority sets official merit and appointments.

BARC OCES/DGFS marks vs. rank

Score rangeStageWhat it takes
Online test: high scoreScreeningClear the discipline cutoff to be shortlisted for interview
GATE routeAlternateA strong GATE score in the discipline can shortlist directly
Interview: strong performanceDecisiveFinal selection as trainee Scientific Officer rests on the interview
Balanced sectionsOverallNo weak section; the discipline paper carries the most marks
Steady mock scoresReadinessConsistent timed-mock performance predicts a shortlist

Indicative stage requirements

Online test (screening)Decisive

Indicative marks: Discipline-wise cutoff shortlists candidates for interview

GATE routeAlternate

Indicative marks: A valid GATE score in the discipline can shortlist directly

InterviewFinal

Indicative marks: Final selection is based on interview performance

Reserved categoriesRelaxed

Indicative marks: Lower cutoffs and age relaxation as per norms

Unit / postingRank-based

Indicative marks: Depends on discipline, rank, preference and vacancies

The BARC OCES/DGFS pattern here — the online-test / GATE screening followed by an interview, the 100-question 300-mark online test with +3/−1 marking, and the discipline-plus-mathematics-plus-aptitude-plus-applied-science coverage — reflects BARC's recent published pattern. Exact vacancies, cutoffs, dates, eligibility and disciplines change each recruitment cycle; always confirm current specifics in the official BARC notification at barc.gov.in.

DAE units and outcomes through BARC OCES/DGFS

BARC recruits Scientific Officers for the Department of Atomic Energy through OCES/DGFS; the unit you are posted to depends on your discipline, rank, preferences and vacancies. The list below shows the kind of DAE units and roles the programme feeds into — actual placements change every year with vacancies and requirements.

Unit / outcomeTypeRoleSelection outcome
Trainee Scientific Officer (BARC)DAEScientific OfficerRank & preference based
Nuclear Power Corporation of India (NPCIL)DAE PSUScientific OfficerRank & preference based
Indira Gandhi Centre for Atomic Research (IGCAR)DAEScientific OfficerRank & preference based
Nuclear Fuel Complex (NFC)DAE PSUScientific OfficerRank & preference based
Heavy Water Board (HWB)DAEScientific OfficerRank & preference based
Bhabha Atomic Research Centre facilitiesDAEScientific OfficerRank & preference based
OCES orientation courseBARC Training SchoolOne-year courseOn selection
DGFS fellowship (M.Tech)Designated instituteFellowship + absorptionLimited seats

A representative view of units and selection routes linked to BARC OCES/DGFS. Confirm vacancies, stages and final appointments in the current official notice.

BARC OCES/DGFS important dates

The typical BARC OCES/DGFS recruitment timeline, from notification to result and document verification. Dates are tentative until the official notice is released.

  1. Notification & apply

    Usually around March–April

  2. Online test / GATE shortlisting

    Typically around May–June

  3. Online test result

    A few weeks after the exam

  4. Interviews

    Usually a couple of months after shortlisting

  5. Final selection

    After the interview

  6. Training / course start

    Later in the year

BARC OCES/DGFS — frequently asked questions

Quick, reliable answers to the questions BARC OCES/DGFS aspirants ask most.

What is the BARC OCES/DGFS selection process?

Candidates are screened either through the BARC online test or a valid GATE score in the relevant discipline, and those shortlisted are called for an interview. Final selection as a trainee Scientific Officer is based on interview performance.

What is the BARC online test pattern?

The online test has 100 questions for 300 marks in 120 minutes. Each correct answer earns 3 marks and each wrong answer carries a penalty of 1 mark. It covers the candidate's core discipline along with engineering mathematics, analytical and numerical aptitude and applied science.

Is there negative marking in the BARC online test?

Yes. Each correct answer earns 3 marks and each wrong answer carries a penalty of 1 mark. There is no penalty for unanswered questions, so guess only when you can eliminate options to a confident choice.

What is the difference between OCES and DGFS?

OCES is a one-year orientation course at the BARC Training School after which trainees are posted as Scientific Officers. DGFS lets selected candidates complete an M.Tech at a designated institute with a DAE stipend before being absorbed as Scientific Officers.

Which units can I be posted to?

Successful trainees are absorbed as Scientific Officers across Department of Atomic Energy units such as BARC, NPCIL, IGCAR, the Nuclear Fuel Complex and the Heavy Water Board, depending on discipline, rank, preferences and vacancies.

How should I use these mock tests?

Take full-length timed mocks to build speed and section balance under the real 120-minute clock and negative marking, and review the solution for every question. Use the topic tests to drill your core discipline, engineering mathematics, numerical aptitude and applied science until each becomes a reliable source of marks.

Start your BARC OCES/DGFS preparation today

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Devaseelan

Devaseelan

Cleared NEET