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WorksheetsLecture 3: Electrochemical Sensor UI
Total questions: 15
Worksheet time: 5mins
What is the primary function of electrochemical sensors?
To measure light intensity
To convert chemical information into an electrical signal
To detect mechanical vibrations
To amplify sound waves
Which of the following is a key feature of electrochemical sensors?
High power consumption
Slow response times
High sensitivity and specificity
Limited portability
What is the role of the reference electrode in a potentiometric sensor?
To react with the target ion
To maintain a constant and stable potential
To measure conductivity
To supply current to the system
Which equation governs the potential measurement in potentiometric sensors?
Einstein's equation
Arrhenius equation
Nernst equation
Ohm's law
Which type of ion-selective membrane is commonly used in pH sensors?
Glass membrane
Polymer membrane
Solid-state membrane
Liquid membrane
What material is commonly used to enhance the selectivity and sensitivity of sensor membranes?
Graphene oxide
Calcium carbonate
Silver chloride
Sodium bicarbonate
What is the primary measurement principle of amperometric sensors?
Measuring voltage across a membrane
Measuring current generated by redox reactions
Measuring changes in resistance
Measuring capacitance of a material
Which field commonly uses amperometric sensors for diagnostics?
Astrophysics
Clinical healthcare
Mechanical engineering
Structural biology
What is the relationship between current and analyte concentration in amperometric sensors?
Inversely proportional
Logarithmically proportional
Directly proportional
Independent
What is the main role of the working electrode in an amperometric sensor?
To provide a stable reference potential
To generate current by facilitating redox reactions
To balance the ionic flow in the system
To separate reactants from products
Which component ensures a stable potential in amperometric sensors?
Working electrode
Counter electrode
Reference electrode
Electrolyte
Which device is used to maintain a constant potential at the working electrode?
Multimeter
Oscilloscope
Potentiostat
Ammeter
Which of the following is an example of an enzyme-based amperometric sensor?
Oxygen sensor
Glucose biosensor
CO₂ sensor
Mercury analyzer
In a glucose biosensor, which enzyme is commonly used?
Urease
Glucose oxidase
Catalase
Peroxidase
Which of the following is an advantage of amperometric sensors?
Low sensitivity to analyte concentration
High specificity and rapid response
Requirement for frequent manual calibration
Incompatibility with portable devices
