20+ Top Semiconductor Sensors MCQs with Answers
Which type of semiconductor sensor is commonly used for temperature measurement?
a) Photodiode
b) Thermistor
c) Phototransistor
d) Hall Effect sensor
Answer: b
Hint: Thermistors are widely used for temperature sensing.
The resistance of a thermistor __________ with an increase in temperature.
a) Decreases
b) Increases
c) Remains constant
d) Fluctuates
Answer: a
Hint: Thermistors are negative temperature coefficient (NTC) devices, meaning their resistance decreases with temperature rise.
Which semiconductor sensor is used to measure magnetic fields?
a) Photodiode
b) Thermocouple
c) Phototransistor
d) Hall Effect sensor
Answer: d
Hint: Hall Effect sensors are employed for magnetic field measurements.
What is the principle behind the Hall Effect sensor operation?
a) Photoemission
b) Photoconductivity
c) Hall Effect
d) Photoelectric effect
Answer: c
Hint: Hall Effect sensors utilize the Hall Effect to measure magnetic fields.
Infrared (IR) sensors use semiconductor materials that are sensitive to:
a) Visible light
b) Ultraviolet light
c) Infrared radiation
d) Radio waves
Answer: c
Hint: Infrared sensors are responsive to infrared radiation.
Which semiconductor sensor is commonly used in digital cameras and optical mice?
a) Thermistor
b) Hall Effect sensor
c) Phototransistor
d) CCD sensor
Answer: d
Hint: CCD sensors are prevalent in digital imaging devices.
The response of a semiconductor gas sensor changes in the presence of specific gases due to:
a) Hall Effect
b) Photoemission
c) Gas diffusion
d) Gas adsorption
Answer: d
Hint: Gas sensors detect gases based on their adsorption characteristics.
What type of thermal sensor is commonly used to measure body temperature?
a) Thermocouple
b) Infrared sensor
c) Thermistor
d) Mercury-in-glass thermometer
Answer: c
Hint: Thermistors are often used for medical temperature measurements.
In a thermocouple, the temperature difference between the two junctions generates:
a) Voltage
b) Current
c) Heat
d) Light
Answer: a
Hint: Thermocouples produce a voltage proportional to the temperature difference.
The response time of a thermal sensor is defined as the time taken to:
a) Sense a change in the external environment
b) Detect thermal radiation
c) Reach thermal equilibrium
d) Convert heat into electrical signals
Answer: c
Hint: The response time is the time required to reach thermal equilibrium after an external change.
Which thermal sensor is commonly used to measure contact temperature in industrial applications?
a) Infrared sensor
b) Thermocouple
c) Thermistor
d) Bimetallic thermometer
Answer: b
Hint: Thermocouples are widely used for industrial temperature sensing.
Which thermal sensor measures temperature based on the principle of thermal expansion?
a) Thermocouple
b) Infrared sensor
c) Bimetallic thermometer
d) Thermistor
Answer: c
Hint: Bimetallic thermometers operate on the basis of differential thermal expansion.
Which mechanical sensor is used to measure pressure in a closed system?
a) Accelerometer
b) Strain gauge
c) Load cell
d) Pressure transducer
Answer: d
Hint: Pressure transducers are designed to measure pressure in closed systems.
What type of mechanical sensor is commonly used to measure angular velocity or acceleration?
a) Load cell
b) Pressure transducer
c) Accelerometer
d) Strain gauge
Answer: c
Hint: Accelerometers are used to measure angular velocity or acceleration.
Which mechanical sensor measures the deformation or strain in a material?
a) Strain gauge
b) Pressure transducer
c) Load cell
d) Accelerometer
Answer: a
Hint: Strain gauges measure the deformation or strain in materials.
The output of a load cell is typically in the form of:
a) Voltage
b) Current
c) Force
d) Pressure
Answer: a
Hint: Load cells usually provide an electrical output, often in the form of voltage.
Which mechanical sensor is used to measure the force applied to an object?
a) Pressure transducer
b) Strain gauge
c) Load cell
d) Accelerometer
Answer: c
Hint: Load cells are designed to measure applied force.
Which magnetic sensor is commonly used in automotive applications to measure vehicle speed?
a) Hall effect sensor
b) Fluxgate sensor
c) Magnetoresistive sensor
d) SQUID sensor
Answer: a
Hint: Hall effect sensors are frequently used to measure vehicle speed.
The magnetic sensor based on Faraday’s law of electromagnetic induction is:
a) Hall effect sensor
b) Fluxgate sensor
c) Magnetoresistive sensor
d) Eddy current sensor
Answer: d
Hint: Eddy current sensors operate on Faraday’s law of electromagnetic induction.
Which magnetic sensor is used to measure weak magnetic fields in scientific research?
a) Hall effect sensor
b) Fluxgate sensor
c) Magnetoresistive sensor
d) SQUID sensor
Answer: d
Hint: SQUID sensors are employed to measure weak magnetic fields in scientific research.
The operation of a Hall effect sensor is based on the interaction between:
a) Magnetic field and light
b) Magnetic field and electric current
c) Magnetic field and temperature
d) Magnetic field and mechanical strain
Answer: b
Hint: Hall effect sensors work based on the interaction between the magnetic field and electric current.
Which magnetic sensor is widely used in electronic compasses and navigation systems?
a) Hall effect sensor
b) Fluxgate sensor
c) Magnetoresistive sensor
d) SQUID sensor
Answer: c
Hint: Magnetoresistive sensors are commonly used in electronic compasses and navigation systems.
Chemical sensors are commonly used in which field to detect and measure specific substances?
a) Medical
b) Automotive
c) Environmental
d) Telecommunications
Answer: c
Hint: Chemical sensors are extensively used in environmental monitoring to detect specific substances in air, water, etc.
Which chemical sensor is commonly used to measure the concentration of oxygen in medical applications?
a) pH sensor
b) Gas sensor
c) Oxygen sensor
d) CO2 sensor
Answer: c
Hint: Oxygen sensors are widely used in medical devices to monitor oxygen levels in patients.
The pH sensor is used to measure the acidity or alkalinity of a solution based on changes in:
a) Temperature
b) Pressure
c) Light intensity
d) Hydrogen ion concentration
Answer: d
Hint: pH sensors measure the concentration of hydrogen ions in a solution to determine its acidity or alkalinity.
Which chemical sensor is commonly used in industrial settings to detect the presence of flammable or toxic gases?
a) pH sensor
b) Gas sensor
c) Oxygen sensor
d) CO2 sensor
Answer: b
Hint: Gas sensors are employed in industrial environments to detect flammable or toxic gases.
The electrochemical sensor operates based on the conversion of a chemical reaction into:
a) Heat
b) Light
c) Electric current
d) Sound
Answer: c
Hint: Electrochemical sensors convert chemical reactions into electric currents for detection.
Which chemical sensor is used in greenhouse applications to monitor and control CO2 levels?
a) pH sensor
b) Gas sensor
c) Oxygen sensor
d) CO2 sensor
Answer: d
Hint: CO2 sensors are used in greenhouse applications to monitor and control carbon dioxide levels.
The gas sensor based on metal oxide semiconductors exhibits changes in conductivity when exposed to:
a) Light
b) Electric current
c) Flammable gases
d) Water vapor
Answer: c
Hint: Metal oxide gas sensors show changes in conductivity when exposed to specific gases like flammable ones.
Which chemical sensor is used in water quality monitoring to detect and measure the presence of pollutants?
a) pH sensor
b) Gas sensor
c) Oxygen sensor
d) Turbidity sensor
Answer: d
Hint: Turbidity sensors are employed in water quality monitoring to detect pollutants that cause cloudiness in water.
The chemical sensor used in breathalyzers to measure blood alcohol concentration is based on:
a) pH sensor
b) Gas sensor
c) Electrochemical sensor
d) CO2 sensor
Answer: c
Hint: Breathalyzers use electrochemical sensors to measure blood alcohol concentration through breath analysis.
The response of a chemical sensor to specific substances is highly selective and sensitive due to its:
a) Electrochemical properties
b) Optical properties
c) Specific chemical coating
d) Mechanical structure
Answer: c
Hint: Chemical sensors are designed with specific chemical coatings that provide high selectivity and sensitivity to target substances
The fluxgate sensor is based on the measurement of changes in:
a) Electric potential
b) Magnetic flux density
c) Temperature
d) Light intensity
Answer: b
Hint: Fluxgate sensors measure changes in magnetic flux density.
Which magnetic sensor is used to detect the presence of metal objects in industrial applications?
a) Hall effect sensor
b) Eddy current sensor
c) Magnetoresistive sensor
d) Fluxgate sensor
Answer: b
Hint: Eddy current sensors are utilized to detect metal objects in industrial applications.
The output of a magnetoresistive sensor is influenced by changes in:
a) Electric current
b) Magnetic field strength
c) Temperature
d) Mechanical stress
Answer: b
Hint: Magnetoresistive sensors respond to changes in magnetic field strength.
Which magnetic sensor is used to measure magnetic hysteresis in magnetic materials?
a) Hall effect sensor
b) Fluxgate sensor
c) Magnetoresistive sensor
d) BH loop sensor
Answer: d
Hint: BH loop sensors are employed to measure magnetic hysteresis.
The phenomenon of magnetoresistance is the basis for the operation of:
a) Hall effect sensor
b) Fluxgate sensor
c) Magnetoresistive sensor
d) Eddy current sensor
Answer: c
Hint: Magnetoresistive sensors operate on the phenomenon of magnetoresistance
In a strain gauge, resistance changes in response to:
a) Pressure
b) Acceleration
c) Force
d) Temperature
Answer: c
Hint: Strain gauges exhibit changes in resistance due to applied force.
Which mechanical sensor is commonly used in automotive applications to measure engine RPM?
a) Pressure transducer
b) Accelerometer
c) Load cell
d) Tachometer
Answer: d
Hint: Tachometers are used to measure engine RPM.
The piezoelectric effect is the basis for the operation of:
a) Pressure transducers
b) Strain gauges
c) Accelerometers
d) Load cells
Answer: c
Hint: Accelerometers are based on the piezoelectric effect.
Which mechanical sensor is used to measure the weight or mass of an object?
a) Pressure transducer
b) Strain gauge
c) Accelerometer
d) Load cell
Answer: d
Hint: Load cells are used for weight or mass measurements.
The output of a pressure transducer is usually in the form of:
a) Voltage
b) Current
c) Force
d) Displacement
Answer: a
Hint: Pressure transducers typically provide an electrical output, often in voltage form
Infrared sensors detect temperature by measuring:
a) Voltage difference
b) Pressure changes
c) Infrared radiation
d) Sound waves
Answer: c
Hint: Infrared sensors respond to infrared radiation emitted by objects.
The Seebeck effect is the basis for the operation of:
a) Thermocouples
b) Thermistors
c) Infrared sensors
d) Bimetallic thermometers
Answer: a
Hint: The Seebeck effect is the underlying principle of thermocouples.
Which thermal sensor uses a bimetallic strip to measure temperature changes?
a) Infrared sensor
b) Thermocouple
c) Thermistor
d) Bimetallic thermometer
Answer: d
Hint: Bimetallic thermometers use a bimetallic strip to indicate temperature changes.
The range of a thermal sensor refers to the:
a) Time is taken to respond to temperature changes
b) Maximum temperature it can measure
c) Temperature difference between its two junctions
d) Time is taken to reach thermal equilibrium
Answer: b
Hint: The range specifies the maximum and minimum temperatures a sensor can measure.
Which thermal sensor is commonly used for high-temperature measurements in industrial applications?
a) Thermocouple
b) Infrared sensor
c) Thermistor
d) Bimetallic thermometer
Answer: a
Hint: Thermocouples are often used for high-temperature industrial applications
The response time of a semiconductor sensor is defined as the time taken to:
a) Sense a change in the external environment
b) Detect a gas leak
c) Reach thermal equilibrium
d) Respond to electrical signals
Answer: c
Hint: The response time is the time required to reach thermal equilibrium after an external change.
Which semiconductor sensor is commonly used to measure light intensity?
a) Thermistor
b) Photodiode
c) Hall Effect sensor
d) Infrared sensor
Answer: b
Hint: Photodiodes are widely used as light sensors.
A piezoresistive sensor is based on the principle that the resistance of a semiconductor material changes with:
a) Temperature
b) Light intensity
c) Pressure
d) Magnetic field
Answer: c
Hint: Piezoresistive sensors measure pressure-induced changes in resistance
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