Question 1
A TEM operator observes image distortion caused by astigmatism during alignment. Which adjustment is appropriate?
Show answer & explanation
Correct answer: A - Adjust objective lens stigmators
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These 10 free CEMT questions are organized by exam domain, so you can see how each part of the Certified Electron Microscopy Technologist blueprint is tested. Reveal the answer and explanation under each question.
A TEM operator observes image distortion caused by astigmatism during alignment. Which adjustment is appropriate?
Correct answer: A - Adjust objective lens stigmators
Repeated contamination spots across different specimens should first prompt evaluation of what?
Correct answer: A - Microscope cleanliness and contamination sources
Poor fixation in the center of a thick specimen is most directly related to which factor?
Correct answer: A - Insufficient fixative penetration
Which reagent is used as a post-fixative to improve membrane contrast in biological TEM?
Correct answer: A - Osmium tetroxide
Which resin chemistry components participate in embedding medium preparation?
Correct answer: A - Catalysts and hardeners
Which stain is commonly used for thick-section screening by light microscopy before TEM imaging?
Correct answer: A - Toluidine blue-O
A section shows compression artifacts during ultramicrotomy. Which factor should be investigated first?
Correct answer: A - Knife condition and cutting parameters
A digital TEM image has been resized without updating the scale bar. What is the consequence?
Correct answer: A - The displayed size information may be inaccurate
Which technique uses rapid freezing followed by low-temperature substitution to preserve ultrastructure?
Correct answer: A - High-pressure freezing with freeze substitution
What does molarity describe?
Correct answer: A - Moles of solute per liter of solution
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