Free DANB RHS Practice Test
Radiation Health and Safety questions on technique, image errors, radiation protection and infection control, each answer explained.
For a patient with a narrow arch, especially in the anterior region, which adjustment helps?
165 original questions · 3 domain study pages · 75-question timed mock on the real 60-minute clock
DANB RHS exam format
Answer original Radiation Health and Safety questions written to DANB’s RHS outline, read why each answer is right, then take a full timed exam with the real question count and time limit.
The RHS exam has 75 multiple-choice questions in 60 minutes across three domains. Purpose and Technique is half of it. The exam has tested digital radiography only since July 7, 2022, so every question here uses digital sensors and PSP plates.
| Outline domain | Share of exam | What it covers | Drill |
|---|---|---|---|
| I. Purpose and Technique | 50% | Landmarks and conditions on images, image types and their purposes, acceptable images, technique, error correction, mounting and record rules. | 10-question drill |
| II. Radiation Characteristics and Protection | 25% | X-ray production, radiation physics and biology, units of measure, dose limits, operator and patient protection, consent and malfunctions. | 10-question drill |
| III. Infection Prevention and Control | 25% | Standard precautions for radiographic equipment, barriers, contact surfaces, processing of items used for images, hand hygiene and PPE. | 10-question drill |
Each domain has a study page and a free ten-question drill with the explanation after each answer. Create a free account to save your results; each drill’s first attempt is free.
RHS exam at a glance
- Questions
- 75 multiple-choice questions, each with three or four answer options
- Time
- 60 minutes
- Exam fee
- $270, including DANB’s $75 nonrefundable application fee; $375 when taken with ICE
- Eligibility
- None. Anyone may take the RHS exam.
- Passing score
- Scaled score of 400 on a 100–900 scale
- How it is scored
- Computer adaptive: the score depends on the difficulty of the questions you answer correctly, and every candidate gets the same share of questions from each domain
- Where
- At a Pearson VUE test center or online with remote proctoring, within a 60-day testing window
- Retakes
- No limit. Reapply and pay the full exam fee each time; state rules may require more education.
- Language
- English or Spanish
- Part of
- DANB’s CDA and NELDA certifications; many states recognize or require it for radiography duties
- Pass rate
- 69% of 14,272 RHS exams passed in 2025
DANB’s exams are computer adaptive and do not let you skip a question and come back to it. Our full practice exam gives you the same 75 questions in 60 minutes, spread across the domains by DANB’s percentages, so you practice the pace and the content mix.
Digital radiography only
DANB’s RHS outline, effective March 12, 2025, states that the exam tests digital radiography only and that no film-based concepts have been tested since July 7, 2022. The March 2025 outline also no longer lists acquiring CBCT and cephalometric images as techniques; you still need to know what each image is for.
Common questions
How many questions are on the DANB RHS exam?
75 multiple-choice questions in 60 minutes. Each DANB exam can include a small number of unscored pretest questions that are mixed in and not marked, so answer every question as if it counts.
What score do you need to pass the RHS exam?
A scaled score of 400 on a 100–900 scale. The scaled score is not a number or percent correct: the exam is computer adaptive and scores you on the difficulty of the questions you answer correctly. DANB says the average candidate answers about half the questions correctly.
What is on the RHS exam?
Three domains in DANB’s outline effective March 12, 2025: Purpose and Technique (50%), Radiation Characteristics and Protection (25%) and Infection Prevention and Control (25%). The exam has tested digital radiography only since July 7, 2022.
How much does the RHS exam cost?
$270, which includes DANB’s $75 nonrefundable application fee. Taking RHS and ICE together costs $375. Each retake is a full fee.
Do I need training to take the RHS exam?
DANB has no eligibility requirements for the RHS exam. Many states set their own requirements for performing radiography, such as a course or supervised experience, so check your state dental board.
Does this practice test match the real RHS exam?
DANB’s exams are computer adaptive and do not let you skip a question and return to it, so no practice test can copy one exactly. Our full practice exam gives you the real question count and time limit, with questions spread across the outline’s domains by DANB’s percentages, a score by domain and an explanation for every question.
Ready for exam day?
75 questions in 60 minutes, the real exam’s count and time, scored by outline domain with an explanation for every answer.
Or start with a free 10-question drillMore dental and healthcare practice
- Dental assistant (DANB CDA) practice test
- DANB ICE (infection control) practice test
- DANB GC (general chairside assisting) practice test
- RHS Purpose and Technique
- RHS Radiation Characteristics and Protection
- RHS Infection Prevention and Control
- CCMA (medical assistant) practice test
- Phlebotomy practice test
- CNA practice test
Exam format, domains, fees and policies are from DANB, checked November 2026: DANB: Radiation Health and Safety (RHS) exam · DANB RHS Exam Outline and References (effective 03/12/2025) · DANB 2026 Candidate Handbook (updated 6/22/2026) · DANB CDA 2026 Application Packet (updated 05/13/26) · DANB 2025 exam pass rates · DANB: 4 important details to know about DANB exams.
Original independent practice, written from DANB’s public exam outlines. Not affiliated with or endorsed by the Dental Assisting National Board (DANB). DANB, RHS, ICE, CDA and Certified Dental Assistant are marks of the Dental Assisting National Board, Inc.