29/03/2020Direct 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. Which of the types of waves below has the longest wavelength?X-RaysRadio WavesGamma RaysHertzian Waves2. Which of the following devices has high resistance in total darkness? Photoconductive cellVaristorWire wound resistorsThermistor3. When a compressive force is applied to a quartz crystalpositive charges are inducedboth positive and negative charges are inducednegative charges are inducedno charge is induced4. Piezoelectric crystals __________are not soluble in waterabsorb waterdissolve in waterfloat on water5. Instrument used to measure the difference between two pressure pointsCapacitance transducerDifferential pressure cellStrain gauge transducerManometer6. Pressure measuring device consisting of a group of wires that stretch when pressure is applied.Strain gauge transducerCapacitance transducerDifferential pressure cellManometer7. The following are SI units of pressure exceptPascalBarsJoulesN/m28. What colour does living vegetation appears as on false-colour IR images?BlackBlueGreenRed9. A resolution merge can greatly enhance an image because it can increase the resolution of a low-resolution imageit can change a satellite image into a aerial photograph.it allows you to hand color an image using Drawing tools.it can use the real color of a low-resolution image to enhance a monochromatic high-resolution image.10. PSIA stands for _________________.Pounds per square inch absolutePressure per inch absolutePounds per square inch atmospherePounds per square inch average11. Electromagnetic waves are defined to behave in the same way of which of the following waves?Transverse wavesMechanical waveCompressional wavesLongitudinal waves12. During the middle of the 14th century, who came up with the idea of Camera Obscura in their notebook?Thomas Alva EdisonGalileo GalileiLeonardo Da VinciIsaac Newton13. Microphone converts light into heat.FalseTrue14. Piezoelectric transducer consists of _________copper rodquartz crystalgold crystalaluminum wire15. The following are true except?MOVs are used to regulate the AC line voltage if it becomes too high.None of the aboveMOVs are used to protect computers and electronics from surge voltages called spikes.MOVs are an advanced type of Varistor. Varistors are voltage dependent resistors.16. A piezoelectric transducer has a _________low sensitivityzero sensitivityvery low sensitivityhigh sensitivity17. Which famous french photographer first practiced aerial photography and made photographs of Paris from his balloon in the mid 18th century?Jean-Marie PérierFélix NadarCharles NègreFrançois-Simon-Alphonse Giroux18. A force of 8000 N acts on an area of 400 cm2. Calculate the pressure in Pascals.2,000200,000None of the above20,00019. Piezoelectric crystals produce _________no voltagelow voltagevery high voltagehigh voltage20. The following are true about thermistors exceptThermistors can be Negative or Positive Temperature coefficient.Thermistors have a wide resistance range from cold to hot, very sensitive.None of the aboveWhen cold Thermistors measure open and shorted when hot.21. What does temperature coefficient mean? Change in temperatureHow hot the device can get before damage occurs.The temperature at which the device has zero ohms.How much the resistance, voltage or current of a device changes with heat or cold. For a thermistor it is the amount of resistance change22. What type of component changes its resistance with changes in voltage? As voltage increases the resistance decreases. Wire wound resistorsVaristorThermistorPhotoconductive cell23. Which of the following is the most common type of Thermistor? NTC thermistorPTC thermistorVaristorMOV24. In a strain gauge transducer, __________ flows through the wires, resistance changes proportionally to the stress or strain appliedElectrical temperaturePressurePowerCurrent25. _________ is the most common measurement scale for a manometer.U-tube manometerPressure gauge manometerVacuum manometerBourbon tube manometer26 out of 25Time is Up!