Top 100 NDT Questions and Answers + MCQ Exam (PT, MT, RT, UT) – Complete Guide

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Non-Destructive Testing (NDT) is essential for ensuring the safety and quality of materials without causing damage. Whether you are preparing for interviews or certification exams, this blog provides 100 important MCQs covering PT, MT, RT, and UT methods to help you quickly revise concepts and boost your confidence.

🔹 Basic NDT MCQs (1–20)

Q1. What is NDT?
A. Destructive testing
B. Non-destructive testing
C. Welding process
D. Heat treatment
Answer: B

Q2. Main purpose of NDT is?
A. Destroy material
B. Ensure safety and quality
C. Painting
D. Heating
Answer: B

Q3. Which is NOT an NDT method?
A. PT
B. MT
C. RT
D. Welding
Answer: D

Q4. What does DT stand for?
A. Design Testing
B. Destructive Testing
C. Data Testing
D. Digital Testing
Answer: B

Q5. Which industry widely uses NDT?
A. Oil & Gas
B. Textile
C. Farming
D. Retail
Answer: A

Q6. What is a defect?
A. Perfect structure
B. Discontinuity affecting performance
C. Paint layer
D. Surface finish
Answer: B

Q7. QA stands for?
A. Quality Assurance
B. Quick Action
C. Quantity Audit
D. Quality Area
Answer: A

Q8. QC stands for?
A. Quality Control
B. Quick Check
C. Quantity Control
D. Quality Code
Answer: A

Q9. What is inspection?
A. Manufacturing
B. Checking material condition
C. Selling
D. Packing
Answer: B

Q10. What is discontinuity?
A. Perfect structure
B. Interruption in material
C. Smooth surface
D. Finish
Answer: B

Q11. What is calibration?
A. Cleaning
B. Accuracy setting
C. Heating
D. Cutting
Answer: B

Q12. What is acceptance criteria?
A. Reject all
B. Allowable defect limit
C. Ignore defects
D. Random
Answer: B

Q13. Surface defect means?
A. Internal
B. On surface
C. Deep
D. Hidden
Answer: B

Q14. Internal defect means?
A. Outside
B. Inside material
C. Surface
D. Paint
Answer: B

Q15. Weld inspection is used for?
A. Painting
B. Checking weld quality
C. Cutting
D. Heating
Answer: B

Q16. Corrosion means?
A. Growth
B. Material degradation
C. Heat
D. Paint
Answer: B

Q17. Reliability means?
A. Random result
B. Consistent result
C. Slow
D. Fast
Answer: B

Q18. Repeatability means?
A. Same result again
B. Different result
C. Slow
D. Fast
Answer: A

Q19. Sensitivity means?
A. Speed
B. Detect small defects
C. Weight
D. Size
Answer: B

Q20. Safety in NDT means?
A. Ignore rules
B. Follow safety practices
C. Fast work
D. Cheap
Answer: B

🔹 PT MCQs (21–40)

Q21. PT stands for?
A. Pressure Testing
B. Penetrant Testing
C. Pipe Testing
D. Power Testing
Answer: B

Q22. PT works on which principle?
A. Magnetism
B. Capillary action
C. Radiation
D. Sound
Answer: B

Q23. PT detects?
A. Internal defects
B. Surface defects
C. Deep cracks
D. Thickness
Answer: B

Q24. Penetrant is?
A. Gas
B. Liquid entering defects
C. Solid
D. Heat
Answer: B

Q25. Developer function?
A. Cleaning
B. Draw penetrant out
C. Heating
D. Cooling
Answer: B

Q26. Remover is used to?
A. Add penetrant
B. Remove excess penetrant
C. Heat
D. Cool
Answer: B

Q27. Dwell time means?
A. Cleaning time
B. Waiting time
C. Heating
D. Cooling
Answer: B

Q28. Fluorescent PT uses?
A. Sunlight
B. UV light
C. Heat
D. Pressure
Answer: B

Q29. Visible PT uses?
A. UV light
B. Normal light
C. X-ray
D. Sound
Answer: B

Q30. PT limitation?
A. Expensive
B. Only surface defects
C. Slow
D. Unsafe
Answer: B

Q31. PT applicable on?
A. Porous material
B. Non-porous material
C. Gas
D. Liquid
Answer: B

Q32. Pre-cleaning means?
A. Before testing cleaning
B. After testing
C. During
D. None
Answer: A

Q33. Post-cleaning means?
A. Before
B. After testing
C. During
D. None
Answer: B

Q34. Sensitivity in PT?
A. Speed
B. Detect small cracks
C. Heat
D. Pressure
Answer: B

Q35. Developer dwell time?
A. Waiting time
B. Cleaning
C. Heating
D. Cooling
Answer: A

Q36. PT cannot detect?
A. Surface crack
B. Internal defect
C. Porosity
D. Open defect
Answer: B

Q37. Excess penetrant removal method?
A. Water wash
B. Solvent
C. Both
D. None
Answer: C

Q38. PT used for?
A. Surface crack detection
B. Internal flaw
C. Thickness
D. Heat
Answer: A

Q39. Developer types?
A. Dry
B. Wet
C. Both
D. None
Answer: C

Q40. PT requires?
A. Clean surface
B. Rough surface
C. Heat
D. Pressure
Answer: A

🔹 MT MCQs (41–60)

Q41. MT stands for?
A. Magnetic Testing
B. Magnetic Particle Testing
C. Metal Testing
D. Machine Testing
Answer: B

Q42. MT works on?
A. Plastic
B. Ferromagnetic material
C. Wood
D. Rubber
Answer: B

Q43. Principle of MT?
A. Radiation
B. Magnetic flux leakage
C. Sound
D. Heat
Answer: B

Q44. AC current detects?
A. Internal defects
B. Surface defects
C. Deep defects
D. None
Answer: B

Q45. DC current detects?
A. Surface only
B. Surface + subsurface
C. None
D. Paint
Answer: B

Q46. Yoke is used for?
A. Cleaning
B. Magnetizing
C. Heating
D. Cooling
Answer: B

Q47. MT detects?
A. Surface defects
B. Internal only
C. Color
D. Shape
Answer: A

Q48. Fluorescent MT uses?
A. UV light
B. Heat
C. Pressure
D. Sound
Answer: A

Q49. MT limitation?
A. Expensive
B. Only ferromagnetic
C. Slow
D. Unsafe
Answer: B

Q50. Dry particles used for?
A. Smooth surface
B. Rough surface
C. Liquid
D. Gas
Answer: B

Q51. Wet particles used for?
A. High sensitivity
B. Low
C. Gas
D. None
Answer: A

Q52. Demagnetization means?
A. Add magnet
B. Remove magnetism
C. Heat
D. Cool
Answer: B

Q53. Indication means?
A. Signal
B. Visible pattern
C. Noise
D. Color
Answer: B

Q54. Continuous method?
A. During magnetizing
B. After
C. Before
D. None
Answer: A

Q55. Residual method?
A. During
B. After magnetizing
C. Before
D. None
Answer: B

Q56. MT best detects?
A. Surface cracks
B. Internal defects
C. Thickness
D. Heat
Answer: A

Q57. MT requires?
A. Non-magnetic material
B. Magnetic material
C. Liquid
D. Gas
Answer: B

Q58. Field direction important because?
A. Speed
B. Defect detection depends
C. Heat
D. Pressure
Answer: B

Q59. MT used in?
A. Welding inspection
B. Painting
C. Cutting
D. Heating
Answer: A

Q60. MT particles accumulate at?
A. Smooth area
B. Defect area
C. Clean area
D. Edge
Answer: B

🔹 RT + UT MCQs (61–100)

Q61. RT stands for?
A. Rapid Testing
B. Radiographic Testing
C. Rough Testing
D. Radio Testing
Answer: B

Q62. RT uses?
A. Sound
B. Radiation
C. Heat
D. Magnetism
Answer: B

Q63. RT detects?
A. Surface
B. Internal defects
C. Paint
D. Shape
Answer: B

Q64. X-ray used in?
A. UT
B. RT
C. PT
D. MT
Answer: B

Q65. Film density means?
A. Weight
B. Darkness
C. Size
D. Color
Answer: B

Q66. IQI means?
A. Image Quality Indicator
B. Internal Quality Index
C. Image Quantity Index
D. Inspection Quality Item
Answer: A

Q67. RT advantage?
A. Permanent record
B. Cheap
C. Slow
D. Unsafe
Answer: A

Q68. RT limitation?
A. Safe
B. Radiation hazard
C. Fast
D. Easy
Answer: B

Q69. UT stands for?
A. Unit Testing
B. Ultrasonic Testing
C. Universal Testing
D. Ultra Tool
Answer: B

Q70. UT uses?
A. Radiation
B. Sound waves
C. Heat
D. Magnetism
Answer: B

Q71. UT detects?
A. Surface
B. Internal defects
C. Paint
D. Color
Answer: B

Q72. Couplant used for?
A. Cooling
B. Sound transmission
C. Heating
D. Cleaning
Answer: B

Q73. A-scan shows?
A. Image
B. Signal graph
C. Color
D. Shape
Answer: B

Q74. Echo means?
A. Direct wave
B. Reflected signal
C. Noise
D. Heat
Answer: B

Q75. Thickness measurement done by?
A. PT
B. UT
C. MT
D. RT
Answer: B

🔹 Continuation: RT + UT MCQs (76–100)

Q76. B-scan provides?
A. Graph
B. Cross-sectional view
C. Top view
D. Color image
Answer: B

Q77. C-scan provides?
A. Side view
B. Top view image
C. Graph
D. Heat map
Answer: B

Q78. UT advantage?
A. Slow
B. High accuracy
C. Expensive
D. Unsafe
Answer: B

Q79. UT limitation?
A. Easy
B. Needs skilled operator
C. Cheap
D. Fast
Answer: B

Q80. Frequency in UT means?
A. Speed
B. Wave cycles per second
C. Thickness
D. Heat
Answer: B

Q81. Attenuation means?
A. Increase in signal
B. Loss of signal
C. Heat
D. Reflection
Answer: B

Q82. Dead zone is?
A. Visible area
B. Near surface blind area
C. Deep defect
D. Clean area
Answer: B

Q83. Angle beam used for?
A. Surface inspection
B. Weld inspection
C. Painting
D. Cutting
Answer: B

Q84. Straight beam used for?
A. Weld
B. Thickness measurement
C. Paint
D. Heat
Answer: B

Q85. PAUT means?
A. Basic UT
B. Advanced UT technique
C. Heat test
D. Gas test
Answer: B

Q86. TOFD used for?
A. Heating
B. Defect sizing
C. Painting
D. Cutting
Answer: B

Q87. Calibration block is?
A. Machine
B. Reference standard
C. Tool
D. Gas
Answer: B

Q88. Gain means?
A. Signal decrease
B. Signal increase
C. Heat
D. Color
Answer: B

Q89. Velocity in UT means?
A. Heat speed
B. Sound speed in material
C. Light speed
D. Color
Answer: B

Q90. Scanning means?
A. Heating
B. Moving probe over surface
C. Cooling
D. Cutting
Answer: B

Q91. Indication in UT means?
A. Noise
B. Signal on screen
C. Heat
D. Color
Answer: B

Q92. RT film shows defects as?
A. Colors
B. Dark/light variations
C. Heat
D. Sound
Answer: B

Q93. Radiography best for?
A. Surface defects
B. Internal defects
C. Paint
D. Heat
Answer: B

Q94. UT best for?
A. Surface
B. Internal defects & thickness
C. Paint
D. Color
Answer: B

Q95. Which method is safest?
A. RT
B. UT
C. PT
D. MT
Answer: B

Q96. Which method uses radiation hazard?
A. UT
B. RT
C. PT
D. MT
Answer: B

Q97. Which method requires couplant?
A. MT
B. UT
C. RT
D. PT
Answer: B

Q98. Which method uses magnetic field?
A. UT
B. MT
C. RT
D. PT
Answer: B

Q99. Which method uses liquid penetrant?
A. PT
B. MT
C. RT
D. UT
Answer: A

Q100. NDT is mainly used for?
A. Destroying material
B. Ensuring safety and quality
C. Painting
D. Heating
Answer: B

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