1. Self generating type transducers are _____ transducers.

a) Active

b) Passive

c) Secondary

d) Inverse

Ans : (a)

2. The transducers that converts the input signal into the output signal, which

is a discrete function of time is known as ______ transducer.

a) Active

b) Analog

c) Digital

d) Pulse

Ans : (c)

3. A transducer that converts measurand into the form of pulse is called

a) Active transducer

b) Analog transducer

c) Digital transducer

d) Pulse transducer

Ans : (d)

4. Which of the following is a digital transducer?

a) Strain gauge

b) Encoder

c) Thermistor

d) LVDT

Ans : (b)

5. Strain gauge, LVDT and thermocouple are examples of

a) Active transducers

b) Passive transducers

c) Analog transducers

d) Primary transducers

Ans : (c)

6. An inverse transducer is a device which converts

a) An electrical quantity into a non electrical quantity

b) Electrical quantity into mechanical quantity

c) Electrical energy into thermal energy

d) Electrical energy into light energy

Ans : (a)

7. A strain gauge is a passive transducer and is employed for converting

a) Mechanical displacement into a change of resistance

b) Pressure into a change of resistance

c) Force into a displacement

d) Pressure into displacement

Ans : (a)

8. Resolution of a transducer depends on

a) Material of wire

b) Length of wire

c) Diameter of wire

d) Excitation voltage

Ans : (c)

9. The sensitivity factor of strain gauge is normally of the order of

a) 1 to 1.5

b) 1.5 to 2.0

c) 0.5 to 1.0

d) 5 to 10

Ans : (b)

10. In wire wound strain gauges, the change in resistance is due to

a) Change in diameter of the wire

b) Change in length of the wire

c) Change in both length and diameter

d) Change in resistivity

Ans : (c)

11. Bonded wire strain gauges are

a) Exclusively used for construction of transducers

b) Exclusively used for stress analysis

c) Used for both stress analysis and construction of transducer

d) Pressure measurement

Ans : (c)

12. Certain type of materials generates an electrostatic charge or voltage when

mechanical force is applied across them. Such materials are called

a) Piezo-electric

b) Photo-electric

c) Thermo-electric

d) Photo-resistive

Ans : (a)

13. Quartz and Rochelle salt belongs to _______ of piezo-electric materials

a) Natural group

b) Synthetic group

c) Natural or Synthetic group

d) Fiber group

Ans : (a)

14. Which of the following are piezo electric substances?

1. Barium titanate

2. Lead titanate

3. Lead Zirconate

4. Cadmium and sulphate

Choose correct one

a) 1,2 and 4

b) 1,3and4

c) 1,2and 3

d) 2,3and 4

Ans : (c)

15. Piezo-electric transducers are

a) Passive transducers

b) Inverse transducers

c) Digital transducers

d) Pulse transducers

Ans : (b)

16. Piezo – electric transducers work when we apply ________ to it.

a) Mechanical force

b) Vibrations

c) Illuminations

d) Heat

Ans : (a)

17. Piezo electric crystal can produce an emf

a) When external mechanical force is applied to it

b) When radiant energy stimulates the crystal

c) When external magnetic field is applied

d) When the junction of two such crystals are heated

Ans : (a)

18. The draw backs of strain gauges are

S1: Low fatigue life

S2: They are expensive, brittle and sensitive to temperature

S3: Poor linearity

Choose the correct one

a) S1 and S2

b) S2 and S3

c) S1 and S3

d) S1 only

Ans : (b)

19. LVDT windings are wound on

a) Steel sheets

b) Aluminium

c) Ferrite

d) Copper

Ans : (c)

20. The size of air cored transducers in comparison to the iron core parts is

a) Smaller

b) Larger

c) Same

d) Unpredictable

Ans : (b)

21. The principle of operation of LVDT is based on the variation of

a) Self inductance

b) Mutual inductance

c) Reluctance

d) Permanence

Ans : (b)

22. LVDT is an/a _______ transducer

a) Magneto-strict ion

b) Inductive

c) Resistive

d) Eddy current

Ans : (B)

23. Which of the following can be measured with the help of piezo electric

crystal?

a) Force

b) Velocity

c) Sound

d) Pressure

Ans : (a)

24. S1: Transducer is a device which converts physical into electrical quantity

S2: Transducer is also called as sensor.

a) S1 is true & S2 is false

b) S2 is true & S1 is false

c) Both S1 & S2 are true

d) Both S1 & S2 are false

Ans (b)

27. In a LVDT, the two secondary voltages

a) Are independent of the core position

b) Vary unequally depending on the core position

c) Vary equally depending on the core position

d) Are always in phase quadrature

Ans : (b)

28. Capacitive transducers are normally employed for_________

measurements

a) Static

b) Dynamic

c) Transient

d) Both static and dynamic

Ans : (b)

29. Match the following

1. EEG A. Diagnostic tool for heart alignment

2. ECG B. Diagnostic tool for brain alignment

3. Sphygmo-manometer C. Instrument used for measuring blood pressure

4. Stethoscope D. instrument used to hear pulse/heart beat

Choose the correct one

a) 1- B, 2 – A, 3 – C, 4 – D

b) 1 – B, 2 – A, 3 – D, 4 – C

c) 1- C, 2 – A, 3 – B, 4 – D

d) 1 – A, 2 – B, 3 – C, 4 – D

Ans : (a)

30. Pick the correct statement regarding functions of a transducer

S1: Sense the magnitude, change in & / or frequency of same measurand

S2: To provide electrical output that furnishes accurate, quantitative data

about the measurand

a) S1 is true & S2 is false

b) S2 is true & S1 is false

c) Both S1 & S2 are true

d) Both S1 & S2 are false

Ans : (c)

31. The transducers which requires an external power and their output is a

measure of some variation such as resistance, inductance, capacitance etc., are

called as

a) Active transducer

b) Primary sensor

c) Passive transducer

d) Self generating transducer

Ans : (c)

32. The principle of operation of variable resistance transducer is

a) Deformation leads to change in resistance

b) Displacement of a contact slider on a resistance

c) Coupling of two coils changes with displacement

d) Movement of magnetic field produces variation in resistance of material

Ans : (b)

33. The application of LVDT is

a) Joint motion

b) Finger movement

c) Limb movement

d) Heart wall motion

Ans : (c)

34. Venturi is associated with

a) Venous blood pressure

b) Digital plethysmography

c) Dialysate flow in artificial kidney

d) Blood flow in heart lung machine

Ans : (d)

35. Pressure transducer for measuring blood pressure is

a) Strain gauge transducer only

b) Strain gauge or capacitive transducer

c) Resistive transducer

d) Fiber optic transducer

Ans : (b)

36. The change in resistance of a metal wire owing to strain is due to

S1: Change in dimension of wire expressed by factor (1-2µ)

S2: Change in resistance ?

a) S1 is true & S2 is false

b) S2 is true & S1 is false

c) Both S1 & S2 are true

d) Both S1 & S2 are false

Ans : (b)

37. In foil strain gauge the thickness of foil varies from

a) 2.5 micron to 6 micron

b) 25 micron (or) less

c) 25 micron to 60 micron

d) 2.5 micron to 5 micron

Ans : (a)

38. Photo conductive cell consists of a thin film of

a) Quartz

b) Lithium sulphate

c) Barium titanate

d) Selenium

Ans : (d)

39. S1: In multimode fiber optics, intensity modulating schemes can be

employed.

S2: Schemes using polarizing techniques need birefringent fiber.

a) S1 is true and S2 is false

b) Both S1 and S2 are true

c) S1 is false and S2 is true

d) Both S1 and S2 are false

ans (b)

40. Test electrode is also known as

a) Indicator electrode

b) Reference electrode

c) Second electrode

d) Primary electrode

Ans : (a)

41. Most commonly used indicator electrode is

a) Calomel electrode

b) Silver electrode

c) Silver – Silver chloride electrode

d) Glass electrode

Ans : (d)

42. _________ is the example of photo emissive cell.

a) LDR

b) Photo diode

c) Photo transistor

d) Photo multiplier

Ans : (a)

43. pH value of venous blood is

a) 7.30

b) 7.40

c) 7.35

d) 7.45

Ans : (c)

44. Silver chloride electrode is used as a reference electrode due to its

a) Large half cell potential

b) Stable half cell potential

c) Stable resting potential

d) Stable action potential

Ans : (b)

45. The capacitance microphone is used for the detection of

a) Heart rate

b) Blood flow

c) Heart sound

d) Foot pressure

Ans : (c)

46. In a graded index fiber, the total reflected light takes a _________

a) Straight line path

b) Parabolic path

c) Elliptical path

d) Circular path

Ans (b)

47. ________ fiber is used in interferometric instruments.

a) Monomode

b) Multimode

c) Birefringent

d) Coated

Ans (a)

48. Fiber optic sensor can be used to sense _________

a) Displacement

b) Power

c) Current

d) Resistance

Ans (a)

49. Photo multiplier consists of

a) 1 Photo emissive cathode & 2 dynodes

b) 2 Photo emissive cathodes & 2 dynodes

c) 2 Photo emissive cathodes & 1 dynode

d) 1 Photo emissive cathode & 1 dynode

Ans : (a)

50. The resistance of LDR ______ when exposed to radiant energy.

a) Remains unaltered

b) Increases

c) Reaches maximum

d) Decreases

Ans : (d)

51. The more correct a senor can measure, the more ________ it is:

1. Accurate

2. Precise

3. Scaled

4. Extent

Correct answer: 1. Accurate

52. The smallest change which a sensor can detect is termed:

1. Accuracy

2. Precision

3. Resolution

4. Scale

Correct answer: 3. Resolution

53. The thermistor whose resistance increases by increasing temperature:

1. NTC Thermistor

2. PTC Thermistor

3. None of these

4. Any of these

Correct answer: 2. PTC Thermistor

54. Sound to electrical energy transducer:

1. Microphone

2. AFR

3. Tactile sensor

4. Pellistor

Correct answer: 1. Microphone

55. Which type of sensor is used to measure the distance between the vehicle

and other objects in its environment:

1. Ultrasonic sensor

2. Tactile sensor

3. Motion sensor

4. None of these

Correct answer: 1. Ultrasonic sensor

Self-driving cars are loaded with ultrasonic sensors that measure the distance

between vehicles and other objects.

56. Which of following is the correct statement about digital sensors:

1. Digital sensors provide information on all possible values within specified limit

2. Digital sensors are limited to a finite set of values

Correct answer: 1. Digital sensors provide information on all possible values

within specified limit

57. You are driving your car and in the middle of the road, the engine loses

power. Which of the following is the probable reason:

1. PCM is getting incorrect information from the camshaft position sensor

2. The ultrasonic sensor of the car is faulty

3. Both of these

4. None of these

Correct answer: 3. Both of these

58. DHT22 sensor is used to sense:

1. Obstacles

2. Resistance

3. Position

4. Humidity

Correct answer: 4. Humidity

59.) The detectors used in optical sensors is

a. Photodiodes

b. Phototransistors

c. Laser

d. Only (a) and (b)

e. All the above

ANSWER: Only (a) and (b)

60) Optical sensors used for the displacement measurement works on the principal that

a. Intensity of light increases with distance

b. Intensity of light decreases with distance

c. Intensity of light remains constant with distance

d. Intensity of light increases with time

ANSWER: Intensity of light decreases with distance

61) Capacitance sensor can measure very small displacement. It can be formed by varying

a. Separation

b. Area

c. Permittivity

d. Either (a) or (b) or (c)

ANSWER: Either (a) or (b) or (c)

62) Resolver works on the principal of mutual inductance variation. It is mainly used for the measurement of

a. Linear displacement

b. Non - linear displacement

c. Rotary motion

d. All of these

ANSWER: Rotary motion

63) In rotary variable differential transformer, the mutual inductance between the primary and secondary coils

varies

a. Linearly with the angular displacement

b. Non - linearly with the angular displacement

c. Linearly with the linear displacement

d. Non - linearly with the linear displacement

ANSWER: Linearly with the angular displacement

64) LVDT which is an instrument for the measurement of displacement, works on the principal of

a. Linear inductance

b. Non - linear inductance

c. Mutual inductance

d. Linear capacitance

ANSWER: Mutual inductance

65) Potentiometer is used for the measurement of

a. Linear displacement

b. Angular displacement

c. Non - linear displacement

d. Only (1) and (2)

e. All the above

ANSWER: Only (1) and (2)

66) The displacement measuring instruments is / are

a. Potentiometer

b. LVDT

c. RVDT

d. All of these

ANSWER: All of these

67. A junction / joint of two dissimilar metal is called _______.

a. reference point b. solder joint c. thermocouple d. all are correct

Answer: c

68. A thermocouple of two different metals has two junctions, first junction is on low

temperature and second junction is on high temperature. True / False

Answer: True

69. The first junction of thermocouple is called __________.

a. hot b. sensing c. cold d. a & b are correct

Answer: d

70. The cold junction of thermocouple is also called Reference Junction. True /

False

Answer: True

71. _______ produced in the thermocouple due to difference of junction temperature.

a. E.M.F b. Current c. Resistance d. a & b are correct

Answer: d

72. An effective galvanometer is used to measure e.m.f in thermocouple.

True / False

Answer: True

73. What characteristics have found in the thermocouple materials.

a. control the environmental effect b. control temperature variations c. more sensitive to measure exact value d. all are correct

Answer: d

74. Thermocouple works on the principle of Seebeck Effect. True / False

Answer: True

75. The temperature range of thermocouple materials are ________.

a. 0º C → 190º C

b. 0º C → 270º C c. 270º C → 2700º C d. 270º C → 370º C

Answer: c

76. The alloy of copper and nickel is called constantan. True / False

Answer: True

77. ______ alloys are used for more than 1400ºc.

a. Platinum b. Iron c. Platinum Iridium d. a & c are correct

Answer: d

78. The required output from thermocouple can get by connecting in series or parallel

groups.

True / False

Answer: True

79. The series & parallel groups of thermocouples are called ________.

a. constantan b. thermodynamics c. thermopiles d. none is correct

Answer: c

80. An e.m.f produced in the thermocouple does not depend on the length of metal

wires.

True / False

Answer: True

81. How to protect the metals of thermocouple from the oxidation process ?

a. enclosed inside tubes b. connect intermediate metal c. keep on room temperature d. all are correct

Answer: a

82. Pyrometer is a thermocouple used in the industrial furnaces for the measurement of

temperature.

True / False

Answer: True

83. Thermocouples are used in the relays for the ______ of power system.

a. protection b. maintenance c. repair d. all are correct

Answer: a

84. Sometimes, thermocouples are used to operate the small AC induction motors. True

/ False

Answer: True

85. ________ size thermocouples are used to measure the internal temperature of human

body in medical work.

a. Small b. Large c. Medium d. Normal

Answer: a

86. In the industries, thermocouples are used upto 1450ºc. True / False

Answer: True

87. Resistance temperature detector is ___________

a) a electrical transducer

b) a mechanical transducer

c) a chemical transducer

d) a physical transducer

Answer: a

Explanation: Resistance temperature detector is an electrical transducer. It is used for measuring

the variation in temperature. It is also known as a resistance thermometer.

88. Relation between temperature and resistance of a conductor is ________

a) Rt = Rref [1+t]

b) Rt = Rref [1+α∆t]

c) Rt = Rref [1-αt]

d) Rt = Rref [1-t]

Answer: b

Explanation: The relationship between temperature and resistance of a conductor is given by

Rt = Rref [1+α∆t]

where, Rt is the resistance of the conductor at t°C.

Rref is the resistance of the conductor at reference temperature

α is the temperature coefficient of resistance

∆t is the difference between the temperature being measured and the reference temperature.

89. Sensing element in the thermometer must provide ________

a) small change in resistance

b) no change in resistance

c) large change in resistance

d) infinite change in resistance

Answer: c

Explanation: The sensing element in a thermometer must give a large change in the resistance for

a given change in the temperature.

90. Platinum is used for industrial applications because ________

a) it is cheap

b) it is available readily

c) it is a noble metal

d) it gives accurate measurements

Answer: d

Explanation: In industrial applications, platinum is used due to its accuracy in providing

measurements. It is also reproducible. Platinum element can be used for the measurement of

temperatures of about 1000 K.

91. Resistance thermometer provides the change in electrical resistance.

a) True

b) False

Answer: a

Explanation: A resistance thermometer provides a change in the electrical resistance with respect

to a variation in the temperature. Basically resistance thermometers work on the principle of

change in the electrical resistance with variation in the temperature.

92. If the sensing element is large, then less amount of heat is required.

a) True

b) False

Answer: b

Explanation: When the sensing element in a resistance thermometer is small in size, then less

quantity of heat is required to raise the temperature. Platinum, nickel and copper are the

commonly used metals for measuring temperature.

93. Most metallic conductors have a ________

a) neutral temperature coefficient of resistance

b) negative temperature coefficient of resistance

c) positive temperature coefficient of resistance

d) zero temperature coefficient of resistance

Answer: c

Explanation: In general metallic conductors have a positive temperature coefficient of resistance.

The resistance increases with an increase in temperature.

94. In a temperature sensing element ________

a) low value of α is required

b) infinite value of α is required

c) α must be zero

d) high value of α is required

Answer: d

Explanation: In order to achieve a large change in the value of resistance for a small change in

the value of temperature, high value of α is required. Change in resistance is measured through a

Wheatstone’s bridge.

95. Nickel and its alloys can be used over a temperature range of ________

a) 100 to 450 K

b) 10 to 50 K

c) 0 to 25 K

d) 5 to 15 K

Answer: a

Explanation: Temperature sensors constructed using nickel and its alloys can be used in the

temperature range of 100 to 450 K. Compared to platinum, they are less expensive. They have a

comparatively higher temperature coefficient that increases with temperature.

96. How can corrosion be prevented in a resistance thermometer?

a) by immersing the setup in oil

b) by enclosing the elements in a glass tube

c) by using guard rings

d) by painting the elements

Answer: b

Explanation: Corrosion can be eliminated in a resistance thermometer by enclosing the elements

in a protective tubular glass made of pyrex, quartz or crystal depending upon the temperature

range.

97. Which devices measures gases or liquid?

a) Proximity sensor

b) Pressure sensor

c) Temperature sensor

d) Touch sensor

Answer: b

Explanation: The pressure sensor is a device for pressure measurement of gases or liquid.

Pressure is an expression of the force required to stop a fluid from expanding.

98. Which sensor measures the pressure relative to perfect vacuum?

a) Absolute pressure sensor

b) Gauge pressure sensor

c) Vacuum pressure sensor

d) Differential pressure sensor

Answer: a

Explanation: Pressure sensor can be classified in terms of pressure ranges they measure,

temperature ranges of operation, and most importantly the type of pressure they measure.

Absolute pressure sensor is a sensor that measures the pressure relative to perfect vacuum.

99. Which sensor measure the pressure relative to atmospheric pressure?

a) Absolute pressure sensor

b) Gauge pressure sensor

c) Vacuum pressure sensor

d) Differential pressure sensor

Answer: b

Explanation: This sensor measures the pressure relative to atmospheric pressure. A tire pressure

gauge is an example of gauge pressure measurement; when it indicates zero, then the pressure it

is measuring is the same as the ambient pressure.

100. Barometer is which type of sensor________

a) Pressure sensor

b) Touch sensor

c) Temperature sensor

d) Humidity sensor

Answer: a

Explanation: Barometers and pressure gauges are the most popular sensors used for IOT

ecosystem. Barometers are an absolute help in weather forecasting as in accurately measures the

ambient air.

101. Touch screen devices use which sensor?

a) Touch sensor

b) Temperature sensor

c) Humidity sensor

d) Pressure sensor

Answer: d

Explanation: Pressure sensors are ultimate solution for IOT as they can be used in various areas

such as touch screen devices.

102. What is the stability of pressure sensor?

a) +/-0.75% FS

b) +/-0.5% FS

c) +/- 0.35% FS

d) +/-0.125% FS

Answer: c

Explanation: One of the main feature of pressure sensor is its stability which is +/-0.35% FS(Full

Scale).

103. What is the operating voltage of pressure sensor?

a) 3.5v

b) 1.5v

c) 5v

d) 3v

Answer: d

Explanation: The pressure sensor has and absolute pressure of 1.2 bar to 10 bar. The typical

operating system is 3v. With a supply voltage of 5v they offer sensitivities of between 15 mV/bar

and 80 mV/bar, depending on type.

104. The feature of c39 is its low insertion height.

a) True

b) False

Answer: a

Explanation: The c39 is especially suitable for IOT and consumer applications. One feature of

c39 is its low insertion height of just 0.24mm, which makes the low-profile MEMS pressure

sensor die ideal for applications in smartphones and wearables.

105. What is the absolute pressure of c39?

a) 2.0 bar

b) 1.5 bar

c) 1.2 bar

d) 1.35 bar

Answer: c

Explanation: The c39 is designed for an absolute pressure of 1.2 bar and, like the c33 series,

offers long-term stability of +/-0.35% FS.

106. Which pressure standard is used for gauge?

a) Dead-weight tester

b) Manometer

c) Pressure switches

d) Stain gauge pressure sensor

Answer: b

Explanation: A mercury manometer is a simple pressure standard and may be used for gauge,

differential, and absolute measurements with a suitable reference.

107. Pressure measured relative to perfect vacuum is termed as ______

a) Absolute Pressure Measurement

b) Differential Pressure Measurement

c) Gauge Pressure Measurement

d) Both Absolute and Differential

Answer: a

Explanation: Pressure measured relative to perfect vacuum is termed as Absolute Pressure

Measurement. Perfect vacuum is a condition where there is no matter present in the atmosphere

and hence nil air pressure exits in that region.

108. In which pressure measurement, pressure of two distinct positions are compared?

a) Absolute Pressure Measurement

b) Differential Pressure Measurement

c) Gauge Pressure Measurement

d) Both Absolute and Differential

Answer: b

Explanation: In differential pressure measurement, pressure of two distinct positions are

compared. For example, pressure difference calculated by measuring it at different floors of a tall

building will give us differential pressure.

109. ______ can be defined as a subtype of differential pressure measurement.

a) Absolute Pressure Measurement

b) Differential Pressure Measurement

c) Gauge Pressure Measurement

d) Both Absolute and Differential

Answer: c

Explanation: Gauge Pressure Measurement is defined as subtype of differential pressure

measurement where we compare pressure pressure at any point to the current atmospheric

pressure. Gauge Pressure measurement is used in applications like tire pressure of blood pressure

measurement.

110. The computer devices and smart phones that have _______ with pressure sensor.

a) Automotive Industry

b) Industrial

c) Aviation

d) Touch screen

Answer: d

Explanation: The computer devices and smart phones that have touch screen display with

pressure sensor. Whenever slight pressure is applied on touch screen through a finger, the sensor

determines where it has been applied.

111. In which place the pressure sensor is needed for monitoring gases and their partial

pressures.

a) Touch screen

b) Automotive Industry

c) Industrial

d) Aviation

Answer: c

Explanation: Pressure sensors are used to monitor gases and their partial pressures in industrial

units so that the large chemical reactions take place in precisely controlled environmental

conditions.

112. Pressure is the _________

a) force per unit area

b) mass per unit area

c) force per unit volume

d) mass per unit volume

Answer: a

Explanation: Pressure at a point is defined as the force acting per unit area. It is measured at

some given point over a surface.

113. Pressure measurement devices make use of ________

a) non-elastic member

b) elastic member

c) bendable member

d) non-bendable member

Answer: b

Explanation: Pressure sensors employ elastic member at the input stage to detect or sense the

pressure variations. Elastic members are usually of various forms and convert the pressure into

mechanical displacement.

114. Output of electrical transducer is ________

a) inversely proportional to displacement

b) proportional to square of displacement

c) proportional to displacement

d) constant

Answer: c

Explanation: The output of an electrical transducer is proportional to displacement. Displacement

is measured using electrical transducers.

115. In general how many pressure sensitive devices are there?

a) 6

b) 20

c) 10

d) 4

Answer: d

Explanation: Usually there are four pressure sensitive devices. They are as follows:

• Diaphragms

• Capsule

• Bourdon tube

• Bellows.

116. Diaphragms in a pressure sensor are of ________

a) 2 types

b) 5 types

c) 10 types

d) 20 types

Answer: a

Explanation: Generally in a pressure sensor we have four pressure sensitive devices. Diaphragm

is a type of a pressure sensitive device. They are of two types:

• Flat type

• Corrugated type.

117. Temperature is the only consideration while selecting a diaphragm.

a) True

b) False

Answer: b

Explanation: While selecting a suitable diaphragm for sensing the pressure the following factors

are considered important.

• Temperature range

• Shock and vibration

• Frequency response requirements.

118. Capsule type of pressure sensor consists of ________

a) 6 dissimilar diaphragms

b) 4 identical diaphragms

c) 2 identical diaphragms

d) 8 dissimilar diaphragms

Answer: c

Explanation: Capsule is a type of a pressure sensor. It comprises of two identical annular

corrugated metal diaphragms that are sealed together to form a shell like enclosure.

119. Bourdon tubes are ________

a) very highly sensitive to shock

b) not sensitive to shock

c) less sensitive to shock

d) more sensitive to shock

Answer: d

Explanation: Bourdon tube is one type of pressure sensor. It is more sensitive to shock and

vibrations as compared to diaphragms. Bourdon tube can be used for precision measurements of

pressure up to 3 MN/m2.

120. Bellows have 5 to 20 convolutions.

a) True

b) False

Answer: a

Explanation: Bellow is a type of pressure sensor. They have about 5 to 20 convolutions. The

number of convolutions depends on the pressure range, displacement, and operating temperature.

121. Sensitivity in a capsule is increased ________

a) through parallel connection of capsules

b) through series connection of capsules

c) through series and parallel connection of capsules

d) by not connecting them at all

Answer: b

Explanation: Capsule is a type of pressure sensor. In a capsule, we can increase the sensitivity by

connecting two or more capsules in series. The resultant displacement is equal to the number of

capsules.

122. Which of the following is not a characteristic of the immobilized enzymes?

a) They cannot be re-used

b) It produces reproducible results

c) Stability exists

d) Same catalytic activity is present for number of analysis

Answer: a

Explanation: Immobilized enzymes can be reused. This ensures that the same catalytic activity is

present for a number of analyses.

123. Which of the following is the physico-chemical component?

a) Enzymes

b) Anti-bodies

c) Transducer

d) Cells or tissues

Answer: c

Explanation: Transducer is referred to as the physico-chemical component. Enzymes and anti-

bodies are biological components.

124. An example of biosensor, urea electrode makes use of which of the following

electrodes?

a) Carbon dioxide electrode

b) Ammonia electrode

c) Fluoride electrode

d) Ammonium electrode

Answer: d

Explanation: An example of biosensor, urea electrode makes use of the ammonium electrode. A

urease membrane is also present.

125. In glucose electrode, glucose oxidase has been coupled to an electrode by which of the

following materials?

a) Ferrocene derivatives

b) Urease

c) Polyacrylamide

d) Biochips

Answer: a

Explanation: In glucose electrode, glucose oxidase has been coupled to an electrode by using

ferrocene derivatives. It is used to measure blood glucose in diabetic patients.

126. Biosensors measure glucose concentrations between which of the following ranges?

a) 10-1

to 10-2

M

b) 10-2

to 10-4

M

c) 10-1

to 10-4

M

d) 10-1

to 10-7

M

Answer: d

Explanation: Biosensors measure glucose concentrations between 10-1

to 10-7

M. It is linear in

the range of 10-2

to 10-4

M.

127. Transducers employed in the bulk of enzyme electrodes use which of the following

principles?

a) Amperometric

b) Optical

c) Magnetic

d) Colorimetric

Answer: a

Explanation: Transducers employed in the bulk of enzyme electrodes use amperometric

principle. It may also use the potentiometric principle.

128. Which of these biosensors use the principle of heat released or absorbed by a reaction?

a) Potentiometric biosensor

b) Optical biosensors

c) Piezo-electric biosensors

d) Calorimetric biosensors

Answer: d

Explanation: Calorimetric biosensors use the principle of heat released or absorbed by a reaction.

The heat is measured to determine the concentration.

129. Which of the following biosensors use the movement of electrons produced during

redox reactions?

a) Amperometric biosensor

b) Potentiometric biosensors

c) Piezo-electric biosensors

d) Optical biosensors

Answer: a

Explanation: Amperometric biosensor uses the movement of electrons produced during redox

reactions. Redox reactions involve both reduction and oxidation.

130. Nanoscopic optical biosensors have fast response time but the sensitivity is reduced.

a) True

b) False

Answer: b

Explanation: Nanoscopic optical biosensors have a fast response. They also have excellent

biochemical sensitivity.

140. Given below is the diagram of biosensor. Identify the unmarked component.

a) Microprocessor

b) Filter

c) Transducer

d) A/D converter

Answer: c

Explanation: The biological signals must be converted into electrical signals. Transducers are

used for this purpose.

141. In glucose sensor, a measure of change in oxygen value is a measure of the glucose

value.

a) True

b) False

Answer: a

Explanation: In glucose sensor, a measure of change in oxygen value is a measure of the glucose

value. It is then processed and displayed.

142. For constructing the glucose sensor, which of the following is used as a gel?

a) Urea

b) Urease

c) Acrylamide

d) Polyacrylamide

Answer: d

Explanation: For constructing the sensor, polyacrylamide is used as the gel. It is used to entrap

the glucose oxidase.

143. _______________ converts biochemical events into measurable signals.

a) amplifier

b) opamp

c) rectifier

d) transducer

Answer: d

Explanation: Transducers convert biochemical events into measurable signals. They provide the

means for detecting the biochemical changes inside the body. Particularly biosensors are

employed for this purpose.

144.Home blood glucose sensor works on which principle?

a) electro-physiological

b) electrochemical

c) physio-chemical

d) chemical

Answer: b

Explanation: Home blood glucose detection sensor works on the principle of electrochemical.

The biosensor in this instrument relies upon enzymes that recognise and catalyze reactions of

glucose with the generation of redox – active species that are detected electrochemically.

THERMOCOUPLE MCQS LINK

https://mcqslearn.com/sat/physics/thermocouple-thermometer-mcqs.php