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Free NRPP RMP Practice Questions

10 free, exam-style NRPP Radon Measurement Professional (NRPP RMP) practice questions with answers and explanations. No signup required. Work through them below, then take the full free NRPP RMP practice test to study every exam domain.

These 10 free NRPP RMP questions are organized by exam domain, so you can see how each part of the NRPP Radon Measurement Professional blueprint is tested. Reveal the answer and explanation under each question.

Domain 1: Communicate with the Client (Field Technician portion; 17%)

Question 1

A homeowner who smokes asks about their risk from a confirmed indoor radon level of 4 pCi/L. Based on EPA lifetime risk estimates, the approximate lung cancer risk for smokers exposed at this concentration is:

  1. 7 per 1,000
  2. 21 per 1,000
  3. 62 per 1,000
  4. 150 per 1,000
Show answer & explanation

Correct answer: C - 62 per 1,000

Domain 2: Evaluate the Test Site (Field Technician portion; 24%)

Question 2

After installation of an active sub-slab depressurization system, a short-term radon test should be initiated:

  1. Immediately upon system activation
  2. At least 24 hours but within 30 days after activation
  3. At least 48 hours but within 60 days after activation
  4. At least 7 days but within 90 days after activation
Show answer & explanation

Correct answer: B - At least 24 hours but within 30 days after activation

Domain 3: Perform the Test (Field Technician portion; 28%)

Question 3

A measurement technician is deploying a charcoal canister in a finished basement. According to MAH-2023 device placement requirements, what is the minimum distance the device must be placed from an exterior wall?

  1. 4 inches (10 cm)
  2. 12 inches (30 cm)
  3. 20 inches (50 cm)
  4. 36 inches (90 cm)
Show answer & explanation

Correct answer: B - 12 inches (30 cm)

Question 4

A 48-hour radon test is scheduled to begin Monday morning. Closed-building conditions must be initiated no later than:

  1. Sunday evening, 12 hours before the scheduled test
  2. Friday evening, 72 hours before the scheduled test
  3. Sunday morning, 24 hours before the scheduled test
  4. Monday morning, at the time of device deployment
Show answer & explanation

Correct answer: A - Sunday evening, 12 hours before the scheduled test

Domain 6: Communicate Basic Radon Science (Measurement Professional portion; 18%)

Question 5

The primary biological hazard from indoor radon exposure is caused by alpha radiation emitted during the decay of:

  1. Polonium-218 and Polonium-214
  2. Lead-214 and Bismuth-214
  3. Radon-222 and Radium-226
  4. Lead-210 and Polonium-210
Show answer & explanation

Correct answer: A - Polonium-218 and Polonium-214

Question 6

At a typical indoor equilibrium factor of 0.5, a radon concentration of 4 pCi/L corresponds to approximately:

  1. 0.01 WL
  2. 0.02 WL
  3. 0.04 WL
  4. 0.20 WL
Show answer & explanation

Correct answer: B - 0.02 WL

Domain 7: Conduct and Validate Measurement Data (Measurement Professional portion; 25%)

Question 7

During a real estate transaction, which measurement approach provides the BEST protection against test interference?

  1. Two activated charcoal canisters deployed side by side
  2. A single alpha track detector deployed for 90 days
  3. An electret ion chamber with gamma background correction
  4. A continuous radon monitor with hourly tamper logging
Show answer & explanation

Correct answer: D - A continuous radon monitor with hourly tamper logging

Question 8

Two collocated passive devices return results of 3.2 pCi/L and 6.8 pCi/L. According to MAH-2023 disagreement resolution procedures, the measurement professional should:

  1. Report the averaged result of 5.0 pCi/L to the client
  2. Report the higher individual reading of 6.8 pCi/L
  3. Report both individual values without an average
  4. Repeat the measurement using new duplicate devices
Show answer & explanation

Correct answer: D - Repeat the measurement using new duplicate devices

Domain 8: Report Findings and Make Recommendations (Measurement Professional portion; 21%)

Question 9

A measurement professional averages two collocated short-term results and obtains 3.95 pCi/L. According to MAH-2023 reporting requirements, this result should be reported as:

  1. 3.9 pCi/L
  2. 3.95 pCi/L
  3. 4.0 pCi/L
  4. Below the EPA action level
Show answer & explanation

Correct answer: C - 4.0 pCi/L

Domain 9: Manage QA/QC Program (Measurement Professional portion; 19%)

Question 10

Two collocated short-term passive devices return results of 5.4 pCi/L and 7.2 pCi/L. The Relative Percent Difference (RPD) for this duplicate pair is approximately:

  1. 14.3%
  2. 25.0%
  3. 28.6%
  4. 33.3%
Show answer & explanation

Correct answer: C - 28.6%

The rest of the NRPP RMP blueprint

The NRPP RMP exam also covers these domains. Drill them in the full free practice test:

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