What is the primary operational principle of a laboratory centrifuge used for separating serum from clot?

Sedimentation of particles under centrifugal acceleration

Separation of substances based on electrical mobility

Partitioning of solutes between two immiscible liquid phases

Adsorption of proteins onto an insoluble porous matrix

What is the core operational principle of a laboratory colorimeter?

Sedimentation via centrifugal acceleration

Electromagnetic force restoration weighing

Critical angle of light refraction

Which setup is commonly found in a semi-automated clinical chemistry analyzer?

Flow cell system with a temperature-controlled Peltier unit

In clinical filter colorimetry, what is the role of an optical filter?

To isolate a specific narrow band of complementary wavelengths

To polarize the incident light wave along a single plane

To convert optical absorbance directly into digital electrical current

To eliminate heat generated by the tungsten halogen bulb

What solvent should be used to clean residual immersion oil from microscope objectives at the end of a shift?

Lens paper moistened with lens cleaning fluid or reagent-grade isopropanol

Distilled water with ordinary bench detergent

Coarse surgical gauze soaked in concentrated xylene

What is the primary functional purpose of the Abbe condenser in a compound light microscope?

To gather and focus light rays onto the specimen

To magnify the intermediate image for the human eye

To regulate light cone aperture and optical contrast

To form the primary magnified real intermediate image

What is the primary technical cause of excessive centrifuge vibration during acceleration?

Unequal sample tube weights in opposing rotor buckets

Dried oil residue or dust on optical surfaces

Loose lamp socket or aging photometer bulb

Worn piston seal or improper tip fitment

What is the consequence of operating a high-speed centrifuge with unbalanced opposing buckets or tubes?

Severe rotor vibration, shaft damage, and tube breakage

Complete failure of the electrical power motor brake

Transformation of serum proteins into insoluble precipitates

Immediate reversal of the centrifugal drive motor rotation

What is the purpose of running an optical reagent blank in clinical colorimetric determinations?

To subtract the intrinsic baseline absorbance of the reagents from the final test reading

To calibrate the balance to zero grams

To double the chemical reaction velocity of the chromogen

To eliminate the optical absorbance caused by high patient serum lipids

In a brightfield compound light microscope, what is the primary optical function of the Abbe condenser?

To collect and focus light rays onto the plane of the specimen

To magnify the primary image produced by the objective lens

To filter out stray ultraviolet wavelengths from the illuminator

To adjust the mechanical interpupillary distance of the oculars

What component of a clinical spectrophotometer converts transmitted light photons into a measurable electrical signal?

Photodetector (Photodiode or Photomultiplier tube)

Why is synthetic immersion oil (refractive index ~1.515) required when using the 100x oil immersion objective lens?

To match the refractive index of glass and reduce refraction at the glass–oil interface

To prevent friction between the glass coverslip and the lens barrel

To chemically fix the stained smear onto the glass slide

To cool the front optical element from heat generated by the lamp

What is the function of the mechanical stage vernier scale on a clinical laboratory microscope?

To record the exact coordinate position of an identified field or cell

To control the intensity of the light source voltage

To calculate the focal length of the objective lens

To switch between coarse and fine focus gears

If a biochemical solution exhibits an intense blue color, which color filter is selected in a filter photometer for maximal absorbance?

Orange filter (about 590–620 nm)

A cuvette used for photometric measurements in the visible spectrum (400 nm to 700 nm) is most commonly constructed from:

Optical glass or clear polystyrene

What type of micropipette calibration check is routinely performed using an analytical balance and deionized water?

Spectrophotometric dichromate absorption test

Electrochemical potentiometric titrimetry

Which mathematical relationship forms the physical basis of quantitative absorption spectrophotometry and clinical colorimetry?

Michaelis-Menten kinetic equation

How does an ion-exchange deionizer produce analytical-grade laboratory water?

By exchanging cations for H+ and anions for OH- ions via synthetic resin beads

By destroying pyrogens using high-intensity UV irradiation

By boiling water at 121 degrees Celsius under 15 psi pressure

By forcing water through a semipermeable polyamide membrane under pressure

When reading the liquid volume in a glass graduated cylinder or volumetric pipette, where should the observer's eye line align?

At the lowest point of the concave liquid meniscus at eye level

Along the top upper edges of the liquid meniscus

Exactly halfway between the top and bottom liquid curvatures

Perpendicular to the top graduation mark regardless of meniscus

What is the correct procedure for diluting concentrated sulfuric acid (H2SO4) with distilled water?

Add concentrated acid slowly down the wall into water with continuous stirring

Pour water rapidly into the acid while swirling vigorously

Mix equal volumes of both simultaneously in a narrow graduated cylinder

Warm the water to 60 degrees Celsius prior to adding concentrated acid

RRB LA UT05 – MLT Fundamentals Practice Test 1: Laboratory Equipments

Rohan Joshi October 24, 2026 39 views 30 Questions

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RRB Laboratory Assistant Grade II (MLT) 34 tests in this series · Click to view included tests ₹149 ₹299

Prepare confidently for the Railway Recruitment Board (RRB) Laboratory Assistant Grade II Computer Based Test (CEN 05/2026) with our dedicated 37-test series for DMLT and B.Sc MLT candidates. Following the exact official RRB exam pattern (100 Questions, 90 Minutes, 1/3rd negative marking), this series offers 28 Core MLT Subject Tests, 4 Non-Technical Tests (Bilingual), and 5 Full-Length CBT Mock Tests with clear laboratory explanations. How We Divided the Official Syllabus into Units Every subject listed in the official RRB Lab Assistant syllabus has been mapped into 9 logical units so you can practice topic by topic: Unit 1: Anatomy & Physiology (Tests 1–4) — Covers Cell Structure, Epithelial & Connective Tissues, Skeletal & Muscular Systems, Heart & Blood Circulation, Respiratory Gas Exchange, Nephron & Urine Formation, Nervous System, and Endocrine Glands. Unit 2: Fundamentals of Medical Laboratory Technology (Tests 5–7) — Covers Laboratory Organization, Cleaning & Maintenance of Glassware, Centrifuges, Balances, Colorimeters, Optical Microscopy, Biomedical Waste Management (BMW Rules 2016), Biosafety Levels, and Quality Assurance (IQC, EQAS, Westgard Rules). Unit 3: Biochemistry & Clinical Biochemistry (Tests 8–11) — Covers Biomolecules, Blood Glucose Estimation (GOD-POD, OGTT, HbA1c), Renal Function Tests (Jaffe's Creatinine, BUN, Uric Acid), Liver Function Tests (van den Bergh Bilirubin, SGOT, SGPT, ALP), Lipid Profile, Serum Proteins, Electrolytes, and Cardiac Markers. Unit 4: Microbiology, Mycology & Virology (Tests 12–15) — Covers Bacterial Morphology, Culture Media (Blood, MacConkey, TCBS, LJ), Gram Staining, Albert's & Ziehl-Neelsen (ZN) Acid-Fast Staining, Biochemical Identification, Kirby-Bauer Antibiotic Sensitivity Testing, Fungal Mounts (KOH, India Ink), ELISA, and Viral Rapid Tests. Unit 5: Pathology & Histopathology (Tests 16–19) — Covers Tissue Fixation (10% Formalin, Bouin's, Zenker's Fluid), Dehydration, Clearing, Paraffin Embedding, Rotary Microtomy, Harris Hematoxylin & Eosin (H&E) Staining, Special Stains (PAS, Perls' Stain), and Exfoliative Cytology (Pap Stain, FNAC). Unit 6: Haematology & Coagulation (Tests 20–24) — Covers Phlebotomy, Anticoagulants (EDTA, Citrate, Heparin, Fluoride) & Vacutainer Color Codes, Hemoglobin Estimation (Drabkin's Method), Neubauer Chamber Cell Counting, Red Cell Indices (PCV, MCV, MCH, MCHC), ESR, Peripheral Blood Smear, Coagulation Tests (PT/INR, aPTT), Anemias, and Leukemias. Unit 7: Blood Banking & Transfusion Medicine (Tests 25–26) — Covers ABO & Rh Blood Grouping (Forward & Reverse Typing), Cross-Matching, Direct & Indirect Coombs Tests (DAT/IAT), Blood Component Separation, Storage Temperatures (PRBC, FFP, Platelets), and Transfusion Reactions. Unit 8: Clinical Pathology & Body Fluid Analysis (Tests 27–28) — Covers Physical, Chemical & Microscopic Urinalysis (Proteinuria, Ketonuria, Casts & Crystals), Cerebrospinal Fluid (CSF) Analysis, Pleural/Ascitic Fluid, Semen Analysis, and Automated Hematology Analyzers. Unit 9: Non-Technical Section (Tests 29–32) — Covers Class 10 General Science (Physics, Chemistry, Biology), General Arithmetic, General Intelligence & Reasoning, and General Awareness (English & Hindi). Full-Length CBT Mock Tests (Tests 33–37) — 5 complete 100-question mock papers (70 MLT Technical + 30 Non-Technical) for full exam simulation. Buy Series

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About This Practice Test:
This timed online practice test covers laboratory equipment, glassware cleaning, volume measurement, and microscopes. It includes questions on balancing centrifuge tubes, how spectrophotometers work, and using pipettes correctly. Use this test to check your knowledge and find topics you need to revise.

Syllabus Covered:
Basic clinical laboratory setup and layout
Types of laboratory glassware, cleaning methods, and volume measurement
How centrifuges work, their care, and safe use
Colorimetry and spectrophotometry (Beer-Lambert law, filters, and light detectors)
Analytical balances and laboratory water purification (distillation and deionization)
Brightfield microscopes (lenses, Abbe condenser, numerical aperture, and oil immersion)

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 Medical Faculties and Health Department Laboratory Technician Examinations

Test Instructions & Features:
30 Questions | Timed Online Test
Explanations for every question
See your score and test results on Solotutes.com