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100+ Free NPCIL Scientific Assistant Practice Questions

Pass your NPCIL Scientific Assistant & Stipendiary Trainee (Category-I) Exam exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: NPCIL Scientific Assistant Exam

100

Questions

NPCIL Exam Pattern

90 Mins

Exam Duration

NPCIL Notification

70%

Technical Weightage

NPCIL Syllabus Guidelines

₹150

Application Fee (Gen/OBC Male)

NPCIL Notification

60%

Minimum Diploma/B.Sc. Marks

NPCIL Eligibility Criteria

18-30 Years

Age Limit

NPCIL Notification

NPCIL Category-I ST/SA selection involves a 1.5-hour CBT with 100 questions (70 technical, 30 non-technical) followed by an interview. Application fee is ₹150 for Gen/OBC/EWS males.

Sample NPCIL Scientific Assistant Practice Questions

Try these sample questions to test your NPCIL Scientific Assistant exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Identify the correct option to fill in the blank: Neither the manager nor the employees _______ present at the meeting yesterday.
A.was
B.were
C.is
D.are
Explanation: When two subjects are joined by 'neither... nor', the verb agrees with the closer subject. Since 'employees' is plural and the sentence is in the past tense ('yesterday'), the plural past verb 'were' is correct.
2Fill in the blank with the appropriate preposition: The safety inspector was satisfied _______ the progress made at the reactor site.
A.with
B.at
C.by
D.of
Explanation: The adjective 'satisfied' is followed by the preposition 'with' when expressing contentment or agreement with someone's actions or a situation.
3Choose the option that is most nearly synonym to the word: PRUDENT
A.Reckless
B.Wise
C.Hasty
D.Foolish
Explanation: Prudent means showing care and thought for the future, which is synonymous with wise, sensible, or cautious.
4Choose the word that is opposite in meaning (antonym) to: DILIGENT
A.Industrious
B.Lazy
C.Attentive
D.Careful
Explanation: Diligent means showing care and conscientiousness in one's work. The exact opposite is lazy, which means unwilling to work or use energy.
5What is the meaning of the idiom 'To burn the midnight oil'?
A.To waste fuel unnecessarily
B.To work or study late into the night
C.To create a fire hazard
D.To wake up early in the morning
Explanation: The idiom 'to burn the midnight oil' refers to the practice of working or studying late into the night, historically referring to using an oil lamp late at night.
6Select the correct passive form of the given active sentence: The engineers designed the control panel.
A.The control panel is designed by the engineers.
B.The control panel was designed by the engineers.
C.The control panel has been designed by the engineers.
D.The control panel is being designed by the engineers.
Explanation: The active sentence is in simple past tense ('designed'). The passive structure for simple past is 'subject + was/were + past participle + by + agent', making 'The control panel was designed by the engineers' correct.
7Select the correct indirect speech form of the sentence: The supervisor said, 'We will start the system test tomorrow.'
A.The supervisor said that they would start the system test the next day.
B.The supervisor said that we will start the system test tomorrow.
C.The supervisor told that they will start the system test the next day.
D.The supervisor said that they would have started the system test tomorrow.
Explanation: In indirect speech, the pronoun 'we' changes to 'they', the modal 'will' changes to 'would', and the time phrase 'tomorrow' changes to 'the next day' or 'the following day'.
8Identify the part of the sentence containing a grammatical error: If he would have studied harder, he would have passed the examination.
A.If he would have
B.studied harder
C.he would have
D.passed the examination
Explanation: In a third conditional sentence, the 'if-clause' uses the past perfect tense ('if + subject + had + past participle'), not 'would have'. Therefore, it should be 'If he had studied harder'.
9Choose the correct spelling from the options given below:
A.Maintenance
B.Maintanance
C.Maintenence
D.Maintanence
Explanation: The correct spelling is 'Maintenance' (derived from maintain, but with 'ten' instead of 'tain' and ending with 'ance').
10Select the word that means: A person who has an unnatural anxiety about one's health, often involving imagined symptoms.
A.Hypochondriac
B.Melancholic
C.Valetudinarian
D.Convalescent
Explanation: A hypochondriac is a person who is abnormally anxious about their health and frequently imagines they are ill.

About the NPCIL Scientific Assistant Exam

The NPCIL Scientific Assistant & Stipendiary Trainee (Category-I) Written Exam is a competitive national-level examination conducted online. The exam is the first stage of selection, followed by a personal interview. It consists of 100 objective questions with 70% technical discipline-specific questions and 30% non-technical questions (English, General Awareness, and Quantitative Aptitude). This practice platform offers 100 high-quality mock questions spanning these areas to help you master concepts and practical problems before the actual test.

Questions

100 scored questions

Time Limit

1 hour 30 minutes (90 minutes)

Passing Score

40% for General/UR/EWS, 30% for SC/ST/OBC/PwBD

Exam Fee

₹150 for General/OBC/EWS male candidates; ₹0 for SC/ST/PwBD/Ex-Servicemen/Female candidates. (Nuclear Power Corporation of India Limited (NPCIL))

NPCIL Scientific Assistant Exam Content Outline

70%

Technical Discipline

Syllabus-specific core engineering concepts (Mechanical, Electrical, Civil, Electronics/Instrumentation) based on diploma guidelines.

10%

Quantitative Aptitude

Mathematical topics like arithmetic progression, percentage, ratio-proportion, simple/compound interest, and algebra.

10%

General Awareness

Current affairs, national news, space and defense, Indian geography, and nuclear power program highlights.

10%

English Language

Basic grammar, prepositions, active/passive voice, idioms, reading comprehension, and error spot checks.

How to Pass the NPCIL Scientific Assistant Exam

What You Need to Know

  • Passing score: 40% for General/UR/EWS, 30% for SC/ST/OBC/PwBD
  • Exam length: 100 questions
  • Time limit: 1 hour 30 minutes (90 minutes)
  • Exam fee: ₹150 for General/OBC/EWS male candidates; ₹0 for SC/ST/PwBD/Ex-Servicemen/Female candidates.

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

NPCIL Scientific Assistant Study Tips from Top Performers

1Focus heavily on core engineering subjects, which represent 70% of the total questions. Revise standard diploma textbook formulas and diagrams.
2Solve previous year papers from different NPCIL units (Rawatbhata, Kakrapar, Tarapur, etc.) as the core technical standard remains consistent.
3Stay updated on India's nuclear energy developments, operating power stations, reactor types (like PHWR), and department names under the Department of Atomic Energy (DAE).
4Brush up on basic English grammar, active-passive voice, direct-indirect speech, and sentence completion to easily secure marks in the English section.
5Practice numerical calculations for the technical and quantitative aptitude sections. The time limit of 90 minutes for 100 questions leaves about 54 seconds per question.

Frequently Asked Questions

What is the NPCIL Scientific Assistant exam selection process?

The selection process consists of two stages: a Computer-Based Test (CBT) or OMR-based Written Exam of 100 marks, followed by a Personal Interview. Final selection is based on candidate performance in both stages as per site-specific weightage.

What is the marking scheme for the NPCIL ST/SA exam?

Each question typically carries +1 or +2 marks depending on the recruitment drive, with a negative marking penalty of 0.25 or 0.5 marks (usually 25% of the correct mark weightage) for every incorrect answer.

What are the educational qualifications for Category-I Stipendiary Trainee?

Candidates must hold a 3-year Diploma in Engineering (Mechanical, Electrical, Civil, Chemical, Electronics, or Instrumentation) or a B.Sc. degree in Physics or Chemistry, with at least 60% aggregate marks from a recognized board or university.

Are there any physical standards required for NPCIL ST/SA?

Yes, for Stipendiary Trainee Category-I, candidates must meet the minimum physical standards: a minimum height of 160 cm and a minimum weight of 45.5 kg.

Is there any negative marking in the exam?

Yes, there is negative marking. Typically, 25% of the marks assigned to a question are deducted for each incorrect response (e.g., -0.5 marks if a question carries 2 marks).

What is the application fee for NPCIL SA recruitment?

Male candidates belonging to General, OBC, and EWS categories must pay an application fee of ₹150. Female candidates, SC, ST, PwBD, Ex-Servicemen, and NPCIL employees are exempted from paying the fee.