Minnesota Laboratory Instrumentation
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. Which instrument is primarily used to measure the absorbance of light
by a sample solution?
A. pH meter
B. Spectrophotometer
C. Centrifuge
D. Autoclave
Answer: B
Rationale: A spectrophotometer measures how much light a sample
absorbs at specific wavelengths, commonly used in chemical and
biochemical analysis.
2. What is the main purpose of calibration in laboratory instruments?
A. Increase sample volume
, B. Improve instrument appearance
C. Ensure accuracy of measurements
D. Sterilize equipment
Answer: C
Rationale: Calibration ensures that an instrument provides accurate
and reliable readings by comparing it to known standards.
3. Which device is used to separate substances based on density using
centrifugal force?
A. Microscope
B. Centrifuge
C. Spectrometer
D. Incubator
Answer: B
Rationale: A centrifuge spins samples at high speed to separate
components based on density differences.
4. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C
Rationale: Ohm (Ω) is the SI unit of electrical resistance.
,5. Which laboratory instrument is used to measure pH?
A. Thermometer
B. pH meter
C. Hygrometer
D. Barometer
Answer: B
Rationale: A pH meter measures hydrogen ion concentration to
determine acidity or alkalinity.
6. What is the primary function of a chromatograph?
A. Measure temperature
B. Separate chemical mixtures
C. Sterilize tools
D. Weigh solids
Answer: B
Rationale: Chromatography separates components of a mixture
based on differential movement through a medium.
7. Which component stores electrical energy in a circuit?
A. Resistor
B. Capacitor
C. Fuse
D. Switch
Answer: B
, Rationale: A capacitor stores and releases electrical energy in an
electric field.
8. What is the function of a microscope condenser?
A. Increase magnification
B. Focus light onto the specimen
C. Rotate the stage
D. Hold slides
Answer: B
Rationale: The condenser focuses light onto the specimen to improve
image clarity.
9. Which parameter is measured by a thermocouple?
A. Pressure
B. Temperature
C. Humidity
D. Voltage
Answer: B
Rationale: A thermocouple measures temperature based on voltage
differences between two metals.
10. What is the purpose of a laboratory autoclave?
A. Dry samples
B. Measure mass
C. Sterilize equipment using steam
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which instrument is primarily used to measure the absorbance of light
by a sample solution?
A. pH meter
B. Spectrophotometer
C. Centrifuge
D. Autoclave
Answer: B
Rationale: A spectrophotometer measures how much light a sample
absorbs at specific wavelengths, commonly used in chemical and
biochemical analysis.
2. What is the main purpose of calibration in laboratory instruments?
A. Increase sample volume
, B. Improve instrument appearance
C. Ensure accuracy of measurements
D. Sterilize equipment
Answer: C
Rationale: Calibration ensures that an instrument provides accurate
and reliable readings by comparing it to known standards.
3. Which device is used to separate substances based on density using
centrifugal force?
A. Microscope
B. Centrifuge
C. Spectrometer
D. Incubator
Answer: B
Rationale: A centrifuge spins samples at high speed to separate
components based on density differences.
4. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C
Rationale: Ohm (Ω) is the SI unit of electrical resistance.
,5. Which laboratory instrument is used to measure pH?
A. Thermometer
B. pH meter
C. Hygrometer
D. Barometer
Answer: B
Rationale: A pH meter measures hydrogen ion concentration to
determine acidity or alkalinity.
6. What is the primary function of a chromatograph?
A. Measure temperature
B. Separate chemical mixtures
C. Sterilize tools
D. Weigh solids
Answer: B
Rationale: Chromatography separates components of a mixture
based on differential movement through a medium.
7. Which component stores electrical energy in a circuit?
A. Resistor
B. Capacitor
C. Fuse
D. Switch
Answer: B
, Rationale: A capacitor stores and releases electrical energy in an
electric field.
8. What is the function of a microscope condenser?
A. Increase magnification
B. Focus light onto the specimen
C. Rotate the stage
D. Hold slides
Answer: B
Rationale: The condenser focuses light onto the specimen to improve
image clarity.
9. Which parameter is measured by a thermocouple?
A. Pressure
B. Temperature
C. Humidity
D. Voltage
Answer: B
Rationale: A thermocouple measures temperature based on voltage
differences between two metals.
10. What is the purpose of a laboratory autoclave?
A. Dry samples
B. Measure mass
C. Sterilize equipment using steam
