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21. Callipers are used to measure:
  A.  Intensity of sound
  B.  Atmospheric pressure
  C.  Distant objects
  D.  Inner and outer diameters of bodies
     
   
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22. Ondometer is used to measure:
  A.  Electric potential difference between two points
  B.  Physical happenings at a distant place
  C.  the frequency of electromagnetic waves in the radio-frequency band
  D.  Distances and angles
     
   
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23. Sphygmometer is used to measure:
  A.  The rate of flow of liquids
  B.  Blood pressure
  C.  The relative density of liquids
  D.  Potential differnce in electric currents
     
   
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24. Cardiogram (ECG) is used to:
  A.  Trace movements of the heart
  B.  To measure wavelength of a radiowave
  C.  Measure heat radiation
  D.  Density of hair
     
   
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25. Which of the following instrument is used to detect objects under water
  A.  Pyrometer
  B.  Tonometer
  C.  Viscometer
  D.  Sonar
     
   
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26. Hypsometer is used to measure :
  A.  Sound under water
  B.  Boiling point of liquid
  C.  Freezing points of liquid
  D.  Force and velocity of wind
     
   
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27. Cathetometer is used to:
  A.  Electric Current
  B.  ----------
  C.  View objects above sea levels
  D.  Electrical power
     
   
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28. What is used to measure the scattering of light by particles suspended in a liquid?
  A.  Cryometer
  B.  Machmeter
  C.  Nephetometer
  D.  Ohmmeter
     
   
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29. Polygraph is used to:
  A.  Record changes in hearbeat, BP and respiration; in lie detection
  B.  Measures altitudes and angles in navigation and astronomy
  C.  Measure the wavelength of a radiowave
  D.  Trace movements of the heartbeats
     
   
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30. Pyrometer is used to:
  A.  Detect object under water
  B.  Measure the speed of an aircraft
  C.  Measure the boiling point of liquid
  D.  Measure very high temperature
     
   
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