AERB RSO-MRF Viva-Voce: How to Prepare

The viva-voce carries exactly as much weight as the written paper — 100 marks — yet most candidates spend far less time preparing for it. Here's how to approach it.

100 marks Minimum 50% required

A note on this guide: AERB does not publish a fixed viva question bank, and specific questions vary by panel and year. This page offers general, practical preparation guidance based on how the exam is structured — not verbatim or leaked exam content.

What the viva-voce actually tests

Unlike the written paper, which rewards recall and calculation, the viva-voce is designed to test whether you can apply your knowledge under pressure — the way an RSO has to on the job. Expect examiners to probe:

Your understanding of why a regulation or safety limit exists, not just what the number is
How you'd respond to a specific radiological scenario — an equipment malfunction, an unexpected survey meter reading, a shielding question for a new installation
Practical, day-to-day RSO responsibilities: record-keeping, incident reporting, dealing with radiation workers, and liaising with the regulatory authority
Your ability to explain physics concepts clearly and precisely, in your own words

How to prepare effectively

Don't just memorize — explain out loud. Practice explaining core concepts (Kerma vs. absorbed dose, shielding design logic, dose limits) as if teaching someone else. If you can't explain it simply, you don't know it well enough yet.
Work through scenarios, not just facts. The written paper's new scenario-based report-writing component is a strong hint at what the viva also rewards — practical judgment applied to a real situation, not textbook recall alone.
Know your own facility's practices. If you've done your internship in a specific type of facility (diagnostic, nuclear medicine, or radiotherapy), be ready to discuss its actual radiation safety setup in detail.
Review the regulatory framework topic closely. Viva panels often test whether you understand the responsibilities of the employer, licensee, RSO, and radiation workers — not just physics.
Mock interviews help more than solo revision. Practicing out loud, under mild time pressure, in front of another person exposes gaps that silent reading never will.

Common mistakes candidates make

Preparing only for the written paper and treating the viva as an afterthought
Giving textbook-perfect definitions without being able to apply them to a scenario
Not being able to justify "why" behind a safety limit or procedure, only "what" it is

Related RSO-MRF guides

Build viva-ready understanding, not just written-exam recall

Our topic-wise mock tests include scenario-based questions throughout — the same style of applied thinking the viva rewards — so your preparation serves both parts of the exam.

See the mock test series →

RadSafety Prep is an independent exam-preparation resource and is not affiliated with AERB or BARC. For official exam information, refer to aerb.gov.in.