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50 mcq biomedical & medical electronics.pptx
The document contains multiple choice questions about biomedical instrumentation topics like ECG, EEG, pulse oximetry, biosensors, and transducers. It provides answers and explanations for some of the questions. The frequency ranges of common EEG waves are listed, with alpha waves occurring at 8-13 Hz when a person is asleep or sitting idle.
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50 mcq biomedical & medical electronics.pptx
- 1. Recording electrical activities associatedwith heart is known as ____________ a) EEG b) EOG c) EMG d) ECG
- 2. Who has poorersignal-to-noise ratio? a) Transmission Pulse Oximeter b) Reflection Pulse Oximeter c) Ear Oximeter d) Pulse Oximeter
- 3. What is thefrequency range of ECG? a) 70-120 Hz b) 0.05-120 Hz c) 5-120 Hz d) 12-120 Hz
- 4. Normal EEG frequencyrange is _______ a) 50-500Hz b) 0.5-50HZ c) 0.05-5Hz
- 5. Source of Bioelectricpotential is ____________ in nature. a) electronic b) electric c) ionic d) mechanical
- 6. Which of thefollowing instrument is used to measure the oxygen saturation level of blood in localized areas of oxygen? a) Ear Oximeter b) Pulse Oximeter c) Skin reflectance Oximeter d) Intravascular Oximeter
- 7. What is thesignal amplitude of EEG? a) 2-200 µV b) 2-200mV c) 2-2000 µV d) 2-2000mV
- 8. The delta wavein EEG ranges from ___________ a) 0.5-4Hz b) 4-8Hz c) 8-13Hz d) 13-22Hz : The delta wave in EEG ranges from 0.5-4Hz. The theta wave in EEG ranges from 4-8Hz. The alpha wave in EEG ranges from 8-13Hz beta wave in EEG ranges from 13- 22Hz.
- 9. Electrodes to measureEEG are placed on ________ a) forehead b) scalp c) cheek d) ears
- 10. Which of thefollowing is considered to be the primary pacemaker of the heart? a) sino-atrial node b) atrio-ventricular node c) purkinje fibres d) bundle of hi
- 11. Recording electrical activities associatedwith heart is known as ____________ a) EEG b) EOG c) EMG d) ECG
- 12. MRI stands for a)magnetic radial imaging b) magnitude radio imaging c) Magnetic resonance imaging d) none of the above
- 13. The principal ionthat is not involved with the phenomena of producing cell potentials is ______________ a) sodium b) potassium c) chlorine d) hydrogen
- 14. Which indicate theaverage heart rate with audible beep a) disposable electrodes b) heart rate meter c) CRT d)none of the above
- 15. CT Scan standfor Computed Tomography Computer Topography Computed Topography Computer Tomography
- 16. After a cellis stimulated, a finite period of time is required for the cell to return to its pre-stimulus state. This period is known as ____________ a) restoration period b) refactory period c) regain period d) regenerative period
- 17. Active transducers workon the principle of ________ a) energy conversion b) mass conversion c) energy alteration d) volume conversion
- 18. Defibrillation is commontreatment for A)life threatening cardiac disrhythmia B) Ventricular fibrillation C)pulse less ventricular tachycardia D)none of the above
- 19. EKG stands for_________________ a) Electrocardiography b) Electroencephalography c) Electromyography d) Electrtokinetcography
- 20. Which type oftransducer requires energy to be put into it in order to translate changes due to the measurand? a) active transducers b) passive transducers c) powered transducers d) local transducers
- 21. Needle electrode isused to measure ____________ a) EKG b) EEG c) EOG d) EMG
- 22. The frequency, wavelength,and velocity of Short wave diathermy is A.25.3 Mhz, 12m, 2×10 power of 7 m/s B.27.12 Mhz, 11m, 3×10 power of 8 m/s C.None of the above D.Can't determine
- 23. What is acceptableleakage current? Less than 0.5 mA Less than 0.8 mA Less than 1 mA Less than 5 mA
- 24. Off-set potential is_____________ a) difference in half-cell potentials between two electrodes b) sum of half-cell potentials between two electrodes c) average of half-cell potentials between two electrodes d) complement of half-cell potentials between two electrodes
- 25. Buffer amplifier converts____________ a) low impedance signals to high impedance signals b) high impedance signals to low impedance signals c) ac impedance signals to dc impedance signals d) dc impedance signals to ac impedance signals
- 26. Which of thefollowing is a preferred electrode for measuring EMG? a) surface electrodes b) needle electrodes c) pregelled electrodes d) scalp electrodes
- 27. Before placing theelectrodes the skin should be __________ a) wet b) dry c) hairy d) oily
- 28. The electrode gelis used to _________ a) reduce skin resistance b) increase skin resistance c) moisturize the skin d) cause skin flaking
- 29. According to theinternational 10/20 system to measure EEG, odd number denotes which side of the brain? a) left b) right c) top d) front
- 30. EEG is therecording of the _________ a) signal from axons of the pyramidal cells b) signal from the dendrites of the pyramidal cells c) cyton secretions d) axon secretions
- 31. Disturbance in theEEG pattern resulting from the external stimuli is called ________ a) provoked response b) ckoored response c) evoked response d) impulse response
- 32. The frequency ofthe waves acquired when the person is in an alert and wakeful state is _______ a) 4 – 8 Hz b) 8 – 13 Hz c) 13 – 30 Hz d) > 30 Hz The alpha waves (8 – 13 Hz) are obtained when a person is asleep. Theta waves (4 – 8 Hz) are found when the person is sitting idle or in children. Sometimes, these waves are generated when the person is about to fall asleep. Gamma waves (> 30 Hz) are found when a person is doing an intense mental activity or is multitasking.
- 33. The letter Tin the EEG electrode placement system denotes? a) temporal lope b) temper lobe c) trace d) timpanic
- 34. Letter F inthe EEG electrode placement system denotes? a) front b) face c) frontal lobe d) fast
- 35. In medical recorders,the signal of interest is of the order of _______ a) nanovolts b) microvolts c) megavolts d) volts
- 36. Metallic micro electrodeshave impedance ________ compared to conventional electrodes? a) equal b) smaller c) high d) very high
- 37. Strain gauge isused to measure ______________ a) temperature b) pressure c) height d) displacement
- 38. The lower temperaturejunction in thermocouple is maintained at ________ a) -273 K b) 0 K c) -327 K d) 273 K
- 39. Sudden involuntary dropin body core temperature below 35*C (95*F) is called __________ a) Accidental hyperthermia b) Accidental misothermia c) Accidental exothermia d) Accidental hypothermia
- 40. The resistance Rtof a metallic conductor at any temperature t is given by ___________ a) Rt = Ro(1+ɑt) b) Rt = Ro(1-ɑt) c) Rt = Ro(ɑt-1) d) Rt = Ro(10+ɑt) Ro is the resistance at 0*C. ɑ is temperature coefficient of resistivity.
- 41. RTD stands for________ a) resistance temperature device b) resistance temperature detector c) reluctance thermal device d) resistive thermal detector
- 42. What is theprinciple behind photoelectric transducers? a) conversion of wind energy to electrical energy b) conversion of light energy to electrical energy c) conversion of mechanical energy to electrical energy d) conversion of electrical energy to light energy
- 43. _______________ converts biochemical eventsinto measurable signals. a) amplifier b) opamp c) rectifier d) transducer
- 44. The biological responseof the biosensor is determined by ______ a) biocatalytic membrane b) physio-chemical membrane c) chemical membrane d) artificial membrane
- 45. Which of thefollowing is not a fundamental block in recording systems? a) electrodes and transducers b) signal conditioner c) analysis for the output d) writing system
- 46. How many wavelengthsare used by Pulse Oximeter? a) 1 b) 2 c) 3 d) 4
- 47. Law obeyed byPulse Oximeter is _______ a) Lambert-Bouguer law b) Beer ‘s law c) Beer-Lambert law d) Lamber-Bouguer, Beer’s and Beer-Lambert Law
- 48. How many LED’sare used in Pulse oximeter probe? a) 1 b) 2 c) 3 d) 4
- 49. Who considered “Humantissues are composed of parallel semi-infinite layers of homogenous materials”. a) Cohen and Wadsworth b) Cohen and Logini c) Cohen d) Wadsworth
- 50. Which of thefour limbs acts like a ground and thus is not a part of the ECG test? a) Right Arm b) Left Arm c) Right Leg d) Left Leg
- 51. The basic structuraland functional unit of the nervous system. a) Nephrons b) Glial cells c) Neurons d) Perikaryon