Lecture 3: Electrochemical Sensor UI

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