RRB LA UT18 – Histopathology Practice Test 3: Microtomy Techniques & Harris H&E Staining Protocols

About this Assessment

 About This Practice Test:
This targeted 30-question bilingual (English and Hindi) online practice test evaluates core technical proficiency in Microtomy, Knife Sharpening, Section Cutting, and Routine Hematoxylin and Eosin (H&E) Staining. Designed strictly according to the RRB Paramedical Category (Laboratory Assistant Grade II, CEN 05/2026) CBT standards and standard MLT curriculum, this test covers rotary microtome operations, clearance angles, flotation water bath settings, sharpening procedures, chemical oxidation of hematoxylin, and slide mounting standards.

Syllabus Covered:
– Microtome types and mechanisms: Rotary microtome (Minot type), base-sledge microtome, and screw-feed sectioning principles
– Section cutting standards: Standard ribbon thickness (3 to 5 µm), clearance angle adjustments (3° to 5°), and flotation water bath temperature (45°C to 50°C)
– Knife profiles and maintenance:
* Wedge vs. planoconcave vs. chisel knife profiles
* Manual honing on oil stones (heel-to-toe, cutting edge forward)
* Manual stropping on leather (toe-to-heel, spine leading)
* Modern low-profile and high-profile disposable blades
– Microtomy troubleshooting: Chatter artifacts, thick-and-thin sections, compression, and knife nicks
– Slide mounting adhesives: Mayer’s egg albumin formulation and hot plate slide drying (60°C to 65°C)
– Routine H&E Staining sequence:
* Deparaffinization in xylene and descending rehydration
* Hematoxylon campechianum natural extraction and chemical ripening of hematein
* Alum hematoxylin formulations (Harris, Mayer, Delafield) and mordants
* Acid alcohol differentiation (0.5% to 1% HCl in 70% alcohol)
* Bluing mechanisms using Scott’s tap water substitute or dilute ammonia
* Eosin Y counterstaining principles and working pH optimization (approximately pH 4.6 to 5.0 in specified formulations; follow validated laboratory SOP)
* Ascending dehydration, xylene clearing, and permanent resinous mounting (DPX is a commonly used example; other compatible synthetic mountants are available)

Applicable Examinations:
– RRB Paramedical Recruitment (Laboratory Assistant Grade II, CEN 05/2026)
– Central Recruitment Boards: DSSSB Lab Technician, ESIC MLT, AIIMS Laboratory Technician, CGHS
– State Paramedical and State Medical Faculty Technical Examinations

Test Instructions & Features:
– 30 Questions | Fully Bilingual (English + Shuddh Academic Hindi)
– Timed CBT Mode: 30 Minutes (1 Minute per Question)
– CBT Marking Scheme: +1.00 for Correct Answer, -0.33 for Incorrect Answer (1/3rd Negative Marking)
– Step-by-Step Technical Explanations for Every MCQ