29/03/2020 Direct Sensing(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Direct Sensing(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Piezoelectric transducer is used for measuringchemical quantitiesany quantityelectrical quantitiesnon-electrical quantities2. Which of the following devices has high resistance in total darkness? ThermistorPhotoconductive cellVaristorWire wound resistors3. Electromagnetic waves are defined to behave in the same way of which of the following waves? Compressional wavesTransverse wavesLongitudinal wavesMechanical wave4. Which of the following best describes the behaviour of a Thermistor.Its resistance increases if the voltage increasesIts resistance decreases if the temperature increasesIts resistance decreases if the voltage increasesIts resistance decreases if the current increases5. To apply pressure to an object, the force should be applied in a ___________ direction to the surfaceHorizontalVerticalPerpendicularNone of the above6. The process of dividing pixel values in an image into a specified number of classes is calledSupervised classificationImage rectificationUnsupervised classificationChange detection7. Piezoelectric transducer consists of _________gold crystalaluminum wirecopper rodquartz crystal8. Microphone converts light into heat.FalseTrue9. Piezoelectric crystals __________dissolve in waterabsorb waterfloat on waterare not soluble in water10. Generally speaking, transmitters are ___________.Differential pressure transmittersOut datedThermocouplesTransducers11. The following are SI units of pressure exceptPascalBarsN/m2Joules12. What range of colours are used is for the sensing, representation, and display of images in modern electronic systems and photography. Red, Green, BlueCyan, Green, YellowCyan, Magneta, Yellow, BlackCyan, Magneta, Yellow13. The photoconductive cell has an increase in conduction when exposed to photon energy (light) which releases free electrons. The extra free electrons lowers the resistance of the cell allowing more current flow.TrueFalse14. Pressure measuring device with two fluid chamber tube gauges connected by a U-shaped tube Strain gauge transducerManometerCapacitance transducerDifferential pressure cell15. Device that contains a measurement diaphragm and capacitor platesDifferential pressure cellStrain gauge transducerManometerCapacitance transducer16. During the middle of the 14th century, who came up with the idea of Camera Obscura in their notebook?Isaac NewtonGalileo GalileiLeonardo Da VinciThomas Alva Edison17. PSIA stands for _________________. Pounds per square inch atmospherePressure per inch absolutePounds per square inch averagePounds per square inch absolute18. The following are true except?MOVs are used to regulate the AC line voltage if it becomes too high.MOVs are used to protect computers and electronics from surge voltages called spikes.MOVs are an advanced type of Varistor. Varistors are voltage dependent resistors.None of the above19. _________ is the most common measurement scale for a manometer. Pressure gauge manometerBourbon tube manometerVacuum manometerU-tube manometer20. What type of component changes its resistance with changes in voltage? As voltage increases the resistance decreases. Photoconductive cellVaristorThermistorWire wound resistors21. At the start of the 19th century, how were pigeons used in the early form of remote sensing?They were used to test tracking equipmentThey conveyed messages from remote sensing stations to anotherThey carried cameras which automatically took picturesThey carried pictures from the battlefield to remote sensing stations22. Which of the following remote sensing technologies use sound? Colour InfraredLORANSONARRADAR23. What type of component has a change in resistance with temperature?VaristorPhotoconductive cellWire wound resistorsThermistor24. A piezoelectric transducer is used as an ignition source for a cigarette.FalseTrue25. In a strain gauge transducer, __________ flows through the wires, resistance changes proportionally to the stress or strain appliedElectrical temperaturePressurePowerCurrent26 out of 25Time is Up!