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Sensors Question & Answers

June 5, 2021 By WatElectronics

This article lists 100+ Sensors MCQs for engineering students. All the Sensors Questions & Answers given below include a hint and wherever possible link to the relevant topic. This is helpful for the users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the Sensors topic.

A Sensor is an electronic device that senses physical quantity in the form of pressure, temperature as input and translates it into electrical form using interfaced components like transducers.

Classification of the sensor depends on the physical property the sensor measures. They are available in 2 types like Analog sensor & digital sensor. Analog sensors generate continuous type analog output signals, using components such as rectifier, relay, and comparator. Examples of Analog sensors are accelerometers, light sensors, and pressure sensors.

Digital sensors convert a measured input value to digital form directly using components such as cable, transmitter, and sensor. Examples of digital sensors are digital clocks, digital accelerometers, and digital temperature sensors.

1). A Sensor is a _______.

Hint
Read more about Sensors.
2). The function of a sensor is to ________.

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3). Which of the following are examples of sensors?

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4). Sensor effectiveness depends on ______ parameter.

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5). Are sensors used along with other electronic devices?

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6). Application of Tactile sensors is _______.

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7). MARG sensor is abbreviated as _________.

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8). MARG sensor is also called as _________.

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9). Sensor provides output signal depending on ________.

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10). Which of the following is considered as input to a sensor?

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11). Sensors convert signals from analog to _______ domain.

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12). LDR sensor is abbreviated as ________.

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13). Which ______ sensors resistance value varies with respect to light intensity?

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14). In LDR sensor, if the intensity of light applied is more, its resistance value becomes _______.

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15). In LDR sensor, if the intensity of light applied is less, its resistance value becomes ________.

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16). Which of the following is an application of the LDR sensor?

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17). LDR sensor is made up of _______ material.

Hint
Read more about Semiconductors.
18). Which other parameter of the LDR sensor changes with respect to incident light along with resistance?

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19). What is the resistance value of the LDR sensor in absence of light _______.

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20). What is the resistance value of the LDR sensor in presence of light ______.

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21). Which of the following is the semiconducting material are used in the LDR sensor?

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22). Do LDR sensors have PN junctions?

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23). LDR symbol depends on ________.

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24). LDR sensor works on ________ principle.

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25). LDR has maximum power dissipation of ________.

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26). What is the maximum voltage value of the LDR sensor at 0 lux?

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27). What is the peak wavelength of the LDR sensor?

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28). What is the minimum resistance value LDR sensor at 10lux?

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29). What is the maximum resistance value of the LDR sensor at 10lux?

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30). What is the typical resistance value of an LDR sensor at 100lux?

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31). What is the dark resistance value of the LDR sensor after 1 second?

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32). What is the dark resistance value of the LDR sensor after 5second?

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33). LDR sensors are classified based on _______ factors.

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34). Does LDR designed with Cadmium Sulfide substance provide a good response to all kinds of luminous radiation?

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35). Does LDR designed with Lead Sulfate substance provide a response to particular infrared radiation?

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36). LDR sensors are classified into _______ types.

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37). Linear LDR sensors are alternatively named as ________.

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38). Linear LDR incorporates photodiodes as ______ due to their linear performance.

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39). Which of the following are the advantages of the LDR sensor?

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40). Which of the following is the disadvantage of LDR sensor?

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41). Which of the following are the characteristics of a good sensor?

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42). The ratio between the resultant output signal to a measured property of a sensor is called ______.

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43). Maximum sensors have _______ transfer function.

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44). A linear transfer function is also called as _______.

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45). Which of the following are the deviations observed in an ideal sensor?

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46). _______ sensor provides data about the chemical composition of its environment in terms of gas, and liquid phase.

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47). Chemical sensor involves _______ number of steps.

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48). In _______ step of chemical sensor molecules interact selectively with receptor type molecules.

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49). Which of the following are the typical kind of biometric materials used for the development of sensors?

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50). Which of the following are the applications of Biosensor?

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Sensor Important Questions for Interviews

51). Biosensors detect _______ biological components.

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52). MOSFET sensor is used to measure ________ parameters.

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53). Which of the following are the applications of MOS sensors?

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54). Which of the following are the components of image sensors?

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55). CMOS active pixel sensor is used in _______ devices.

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56). CCD device is abbreviated as ________.

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57). CCD device was developed by _________.

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58). MOS APS sensor is abbreviated as ________.

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59). MOS APS sensor was developed by _________.

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60). Which of the following are the applications of MOS monitoring sensors?

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61). Which of the following are other MOS sensor technology?

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62). WSN in sensor technology is abbreviated as _________.

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63). Sensors generate an output signal in terms of ___________.

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64). ________ sensor measures temperature.

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65). Which of the following are the examples of temperature sensors?

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66). A temperature sensor is provided with ________ as input.

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67). The output obtained from the temperature sensor is of ______ form.

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68). Sensors are available in how many types?

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69). Analog sensors generate _______ analog kind of output signals.

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70). Which of the following are the examples of Analog sensors?

Hint
Read more about Light Sensor.
71). Which of the following is the function of the accelerometer sensor?

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72). Analog accelerometers are classified based on ________.

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73). Are accelerometers available in digital and analog form?

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74). _____ sensors detect a quantity of light striking the sensor component.

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75). Light sensors are of _______ types.

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76). _______ is used as a switch in Analog sensors.

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77). LDR switch automatically turns on or off depending on _______ factor.

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78). LDR resistance increases with reduce in ________.

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79). A sensor that detects sound levels is called ________ sensor.

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80). Input to sound sensor is ________.

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81). A sound sensor converts sound levels to _______ output.

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82). Which of the following are the components used along with the sound sensor?

Hint
Read more about Amplifier.
83). Which of the following are applications of a sound sensor?

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84). Which of the following are applications of a light sensor?

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85). Which of the following are the advantages of a light sensor?

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86). Which of the following are the disadvantages of a light sensor?

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87). Which of the following are the advantages of a sound sensor?

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88). Which of the following are the disadvantages of a sound sensor?

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89). Which of the following are sound sensors?

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90). A dynamic microphone is based on _______ principle.

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91). A sensor used to measure the quantity of pressure when applied to an object is called _______ sensor.

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92). Pressure sensor generates output in ________ form.

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93). Input to pressure sensor is ________.

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94). Which of the following are the applications of pressure sensors?

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95). The output generated by the piezoelectric sensor is ________.

Hint
Read more about Piezoelectric Sensor.
96). Which of the following are the advantages of a pressure sensor?

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97). Sensors in which data transmission and translation occurs into digital form is _____ sensor.

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98). Do digital sensors overcome the disadvantages of analog sensors?

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99). Digital sensors converter measure input value to digital form in _______ method.

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100). Which of the following are the components of a digital sensor?

Hint

Sensor MCQs for Interviews

101). Which of the following are the components used for communication in a digital sensor?

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102). Which of the following are examples of a digital sensor?

Hint
103). A sensor that generates variable frequency in square waveform output is ______ sensor.

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104). A method in which a sensor that generates variable frequency in square waveform output using a digital accelerometer sensor is called _______.

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105). Output taken from pulse width modulation id proportional to ________.

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106). Which of the following is a digital temperature sensor?

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107). Which of the following is the function of the digital temperature sensor?

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108). Temperature sensor acts as ________.

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109). A temperature sensor is provided with _________ parameters.

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110). TL in temperature sensor is abbreviated as ________.

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111). TH in temperature sensor is called _________.

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112). When the temperature of a measuring device is higher than or equal to reference temperature then the temperature sensor treats the temperature value as ________ temperature.

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113). When the temperature of a measuring device is lower than or equal to reference temperature then the temperature sensor treats the temperature value as ________ temperature.

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114). DA1620 digital temperature sensor has _______ number of pins.

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115). DA1620 digital temperature sensor pin 1 is _______.

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116). DA1620 digital temperature sensor pin 7 is _______.

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117). DA1620 digital temperature sensor pin 6 is ________.

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118). Temperature sensor measures temperature in ____ units.

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119). Which of the following are the components uses in digital temperature sensor DA1620?

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120). A sensor that detects IR light is called _______.

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121). IR in IR sensor stands for _________.

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122). Which of the following is applications of IR sensor?

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123). Which of the following are the advantages of an IR sensor?

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124). Which of the following are the disadvantages of the IR sensor?

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125). IR sensor operates in _______ range.

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126). IR sensor can be divided into _______ number of regions.

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127). Near IR region ranges between ________ range.

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128). Mid IR region ranges between ______ range.

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129). Far IR region ranges between ________ range.

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130). An IR sensor that only measures IR radiation but does not emit is called _______.

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131). Are IR radiations visible to human eyes?

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132). Which of the following are the components of the IR sensor?

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133). Which of the following are the emitter components of the IR sensor?

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134). Which of the following are the detector components of the IR sensor?

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135). IR sensor works on ________ principle.

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136). IR sensors are of _________ types.

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137). Which of the following are the components in the analog sensor?

Hint
Read more about Rectifiers.
138). A sensor that estimates targets attributes is called ______.

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139). Ultrasonic sensor works similar to _______ type of sensors.

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140). Ultrasonic sensors are classified into _______ types.

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141). Which of the following are the applications of ultrasonic sensors?

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142). Which of the following are the components of an IR sensor-controlled robot?

Hint
Read more about 8051 Microcontroller.
143). Which of the following are the components of the IR sensor?

Hint
144). Which of the following are the examples of IR sensor source?

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145). Which of the following are the examples of IR sensor detectors?

Hint
146). Infrared detectors are also called ________.

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147). Passive IR sensors are of ______ types.

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148). Quantum IR sensor provides high ______ performance.

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149). Which of the following are the examples of thermos IR sensors?

Hint
Read more about Bolometer.
150). IR-based Infrared tracking systems use _______ radiation.

Hint

Sensor Exam Questions & Answers

151). LM35 sensor IC is an example of ________ sensor.

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152). Proximity type sensor is a ________ type of sensor.

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153). A sensor that detects the presence of an object without any contact is called _______ sensor.

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154). Which of the following are the methods used for implementing proximity sensors?

Hint
Read more about Hall Effect.
155). Which of the following are the applications of proximity sensors?

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156). Reverse car parking system uses _______ type of sensor.

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157). Which of the following are the advantages of proximity sensors?

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158). Which of the following are the disadvantages of proximity sensors?

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159). Which of the following are the types of IR sensors?

Hint
160). Which type of sensor is used for detecting smoke?

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161). A smoke sensor function is to detect ________.

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162). Which of the following are the applications of a smoke sensor?

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163). Smoke sensors detect different gas types such as ________.

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164). Which of the following are the disadvantages of a smoke alarm?

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165). Which of the following are the advantages of a smoke alarm?

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166). A smoke sensor such as MQ series sensor detects _______ type of gas.

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167). A sensor that detects the percentage of alcohol is _______.

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168). Breath analyzers use _______ type of sensors.

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169). Alcohol sensor detects alcohol percentage in ________ range.

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170). Which of the following are the advantages of an alcohol sensor?

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171). Which of the following are the applications of tilt sensors?

Hint
172). Which of the following are the application of touch sensor?

Hint
173). Touch sensors are classified into _______ types.

Hint
Read more about Touch Sensor.
174). Modern touch sensors applications are built with ______ type of touch sensor.

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175). Which of the following are the advantages of capacitive touch sensors?

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176). Which of the following are the advantages of a touch sensor?

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177). Which of the following are the disadvantages of a touch sensor?

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178). A sensor that is used for building color images is called _______.

Hint
Read more about Color Sensor.
179). Which of the following are the applications of a color sensor?

Hint
180). Is TCS3200 a color sensor?

Hint
181). Which of the following is the function of the TCS3200 color sensor?

Hint
182). A color sensor detects _______ colors.

Hint
183). Colors sensors contain _______ component to reject unwanted UV and IR light.

Hint
184). Which of the following are the components of a color sensor?

Hint
185). A sensor used for monitoring weather humidity condition is called ______.

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186). Which of the following are the advantages of a color sensor?

Hint
189). Which of the following are the disadvantages of a color sensor?

Hint
190). Humidity sensors are classified into how many types?

Hint
191). Which of the following are humidity sensors?

Hint
192). Humidity sensor provides environmental information of _______.

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193). Which of the following are the advantages of a capacitive humidity sensor?

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194). Which of the following are the disadvantages of capacitive humidity sensors?

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195). Which of the following are the advantages of a psychrometric humidity sensor?

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196). Which of the following are the disadvantages of a psychrometric humidity sensor?

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197). Which of the following are the advantages of a Hygrometric humidity sensor?

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198). Which of the following are the disadvantages of a Hygrometric humidity sensor?

Hint
199). A sensor that detects inclination or tilt is called _______.

Hint
200). The tilt sensor is made up of ________ substance.

Hint

Sensor MCQs With Answers

201). Which of the following are the components of the tilt sensor?

Hint
202). Which of the following are the types of tilt sensors?

Hint
203). Tilt sensor measures ________ parameters.

Hint
204). Sensor that work based on gravity and anticipated for DC acceleration is ________.

Hint
205). Application of force balance tilt sensor is _________.

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206). Force balance tilt sensors are used along with _______.

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207). A force balance tilt sensors measure up to _______ frequency.

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208). Which of the following are the advantages of force balance tilt sensor?

Hint
209). Which of the following are the disadvantages of force balance tilt sensor?

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210). Which of the following are the components of the MEMS tilt sensor?

Hint
211). MEMS tilt sensor combines ________ components.

Hint
212). MEMS tilt sensors are ________ sized sensors.

Hint
213). Which of the following are the applications of MEMS tilt sensor?

Hint
214). Fluid-filled tilt sensors are classified as ________.

Hint
215). Electrolytic fluid-filled tilt sensors measures _________.

Hint
216). Electrolytic fluid-filled tilt sensors measure the angle in terms of _______.

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217). Which of the following are the advantages of electrolytic fluid-filled tilt sensors?

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218). Electrolytic fluid-filled tilt sensors are filled with _______.

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219). _______ type of tilt sensors measures non-contact tilt and inclination.

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220). Capacitive type of tilt sensors can be operated using ________.

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221). Which of the following are the components of a capacitive type of tilt sensors?

Hint
222). Which of the following factors are considered while selecting tilt sensors?

Hint
223). Sensors can be connected in _______ number of ways.

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224). Sensors fetch _________ input data to control devices.

Hint
225). Which of the following are the real-time physical input data to control devices by a sensor?

Hint
226). Do sensors translate physical property data into electrical form?

Hint
227). On which of the following factor does the design of a sensor depends?

Hint
228). Which of the following are the general advantages of a sensor?

Hint
229). Which of the following are the general disadvantages of sensor?

Hint
230). _________ type of sensor is used to detect noise.

Hint
231). Which of the following are the examples of noise sensors?

Hint
232). Which of the following are the application of noise sensors?

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233). Noise sensor sense variation in ___ parameter to measure noise level.

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234). Which of the following sensor is used for detecting a nearby distant object?

Hint
235). Proxy sensor radiates ________ to detect an object within its surroundings.

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236). Proxy sensors are classified depending on _________.

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237). _________ type of proxy sensor detects plastic objects.

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238). ___________ type of proxy sensor detects metal objects.

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239). Which of the following are proxy sensors?

Hint
240). Which of the following are the applications of a proxy sensor?

Hint
241). ________ sensor identifies the presence of object and color.

Hint
242). Which of the following are the applications of vision sensors?

Hint
243). Which of the following are the applications of image sensors?

Hint
244). A sensor that measures radiation level is called _________.

Hint
245). Radiation sensor detects radiation level from ________ objects.

Hint
246). Which of the following are the applications of radiation sensor?

Hint
247). _________ sensor detects the position of an object.

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248). Position sensor is of ________ types.

Hint
249). ___________ is a position sensor.

Hint
250). Which of the following are the applications of proximity sensors?

Hint
251). Proximity cards sensor operates up to _______ range.

Hint
252). A sensor that measures the quantity of water in the soil is called ________.

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253). Which of the following are the examples of moisture sensor?

Hint
254). Which of the following are the advantages of moisture sensor?

Hint
255). Which of the following are the applications of moisture sensor?

Hint
256). Photoelectric sensor is also called ________.

Hint
257). A sensor that detects color, motion and location of an object is called _______.

Hint
258). Which of the following is photoelectric sensor?

Hint
259). Which of the following are the applications of phot electric sensor?

Hint
260). PIR sensor stands for _________.

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261). PIR sensor measures _______ type of light emitted from obstacles.

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262). PIR sensors are a ________ detector.

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263). Which of the following are the applications of the PIR sensor?

Hint
264). ________ sensors track object details using ultrasonic waves.

Hint
265). An ultrasonic sensor is also called as ________.

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266). Which of the following are the components of an ultrasonic transducer?

Hint
267). Which component of the ultrasonic sensor converts electrical type signal to ultrasound?

Hint
268). Which component of the ultrasonic sensor converts ultrasound to electrical type signal?

Hint
269). Which component of the ultrasonic sensor sends and receipts ultrasound?

Hint
270). Which of the following are the applications of an ultrasonic sensor?

Hint
271). Which of the following sensor detects disturbances in radio waves?

Hint
272). The tomographic sensor is a type of ________ sensor.

Hint
273). A sensor that detects magnetic power is called ________.

Hint
274). Which of the following are the examples of magnetic sensors?

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275). Which of the following are the applications of a magnetic sensor?

Hint
276). Magnetic sensors work on _______ principle.

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277). A sensor that tracks the pressure of a solid or a liquid is called ________.

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278). A pressure sensor is also called as ________.

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279). Which of the following are the types of pressure sensors?

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280). A sensor that measures pressure with respect to perfect vacuum type is called _______.

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281). A sensor that measures pressure with respect to atmospheric type pressure is called _______.

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282). A sensor that measures pressure below atmospheric type pressure is called _______.

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283). A sensor that measures the difference in 2 pressure level is called _______.

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284). A sensor that measures constant pressure level is called _______.

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285). Which of the following are the applications of an absolute type pressure sensor?

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286). Which of the following is an example of a gauge pressure sensor?

Hint
287). Which of the following are measured using a differential pressure type sensor?

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288). Sealed type pressure sensor is similar to ________.

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289). Which of the following are analog pressure sensors?

Hint
290). The function of a particle sensor is to detect ________.

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291). Is a particle sensor sensitive to cigarette smoke?

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292). A particle sensor is also called ________.

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293). Which of the following are the examples of particle detectors?

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294). Which of the following are the particle detectors used for protection from radiation?

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295). Which of the following are the examples of particle detectors used in nuclear and particle physics?

Hint
296). Which of the following are the examples of solid-state particle detectors?

Hint
297). A sensor that detects the motion of an object alone is called ______.

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298). Which of the following are the application of motion sensors?

Hint
299). A sensor that identifies and monitors the level of a liquid or solid or gas is called ______.

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300). Which of the following are the examples of level sensor?

Hint
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