RPF Constable vs RPF SI: The CBT Is Nearly Identical — the Post Isn't
Same 120 questions, same three sections, same 90-minute timer, same marking scheme. If you are deciding between the two, the written-test preparation genuinely does not change.
RPF Constable and RPF Sub-Inspector are recruited through separate notifications for a genuinely different post, but their Computer Based Tests are, structurally, the same exam. Same 120 questions, same 120 marks, same 90-minute composite timer, same three-section split, same 1/3 negative marking. If you are trying to decide which one to prepare for, or whether to apply to both, the written-test preparation itself barely changes between them.
- RPF Constable and RPF SI sit the exact same CBT shape: 120 questions, 120 marks, 90 minutes, split into Arithmetic (35Q), General Intelligence and Reasoning (35Q), and General Awareness (50Q).
- Neither CBT has a sectional lock: all three sections share one 90-minute composite timer for both posts.
- Both posts' General Intelligence and Reasoning sections officially share the exact same spec as RRB NTPC CBT 2's Reasoning section, so this site's "Explore Similar Tests" pages let Constable and SI candidates practice each other's Reasoning bank directly.
- What differs between the two is the post itself, eligibility and rank, not the written exam — check the official RPF notification for exact age and qualification criteria, since this site does not publish exam-specific eligibility figures.
The CBT, side by side
| Section | RPF Constable | RPF SI |
|---|---|---|
| Arithmetic | 35Q / 35 marks / 26 min | 35Q / 35 marks / 26 min |
| General Intelligence and Reasoning | 35Q / 35 marks / 26 min | 35Q / 35 marks / 26 min |
| General Awareness | 50Q / 50 marks / 38 min | 50Q / 50 marks / 38 min |
| Timer | Single 90-min composite | Single 90-min composite |
| Negative marking | 1/3 per wrong answer | 1/3 per wrong answer |
The written test genuinely doesn't differ
Every number in the CBT pattern, question count, marks, section split, timing, and negative marking, is identical between RPF Constable and RPF SI. Both run on a single 90-minute composite timer with no sectional lock, so the same pacing strategy, timing math, and negative-marking discipline apply equally to either. A candidate preparing for one is, for the written stage, preparing for the other at the same time.
The shared Reasoning bank is not a coincidence
Both posts' General Intelligence and Reasoning sections match RRB NTPC CBT 2's Reasoning spec exactly, 35 questions, 26 minutes, the same +1/-1/3 marking, confirmed from each exam's own official pattern rather than assumed from a shared section name. That is why this site's RPF Constable similar tests and RPF SI similar tests pages exist: extra, genuinely spec-matched Reasoning practice sourced from each other and from RRB NTPC CBT 2, on top of each exam's own tests.
A candidate preparing for RPF Constable is, for the written CBT, preparing for RPF SI at the same time. Every section, timing, and marking number is identical.
What actually differs
The post itself is a different story: RPF SI is a supervisory role with its own eligibility and pay structure, distinct from Constable. This site does not publish specific age-limit or qualification figures, since eligibility criteria are exactly the kind of notification-specific detail worth confirming directly from the official RPF recruitment notice rather than a secondary source.
Practice both CBTs at RPF Constable mock tests and RPF SI mock tests; full official patterns are on their respective exam pattern pages. If you are weighing these against other Railways exams, see RRB NTPC vs Group D vs JE vs ALP.
Put the strategy into practice
Choose a checked mock test and apply what you learned while the idea is fresh.
Frequently asked questions
Is the RPF Constable CBT different from the RPF SI CBT?
No. Both run the exact same pattern: 120 questions, 120 marks, 90 minutes, split into Arithmetic (35Q), General Intelligence and Reasoning (35Q), and General Awareness (50Q), with identical 1/3 negative marking and no sectional lock.
Do RPF Constable and RPF SI share practice content on this site?
Yes, for Reasoning specifically. Both posts' General Intelligence and Reasoning sections match RRB NTPC CBT 2's official spec exactly, so each exam's "Explore Similar Tests" page offers extra Reasoning practice sourced from the other two.
What is the negative marking for RPF Constable and RPF SI?
One-third of a mark is deducted for each wrong answer in both, with 1 mark awarded for each correct answer.
What comes after the CBT for RPF Constable and RPF SI?
A Physical Efficiency Test (PET) and Physical Measurement Test (PMT), both qualifying only, followed by Document Verification.
Where can I check the exact eligibility difference between RPF Constable and RPF SI?
In the official RPF recruitment notification for each post. This site does not publish specific age-limit or qualification figures, since those details are best confirmed directly from the source that sets them.
