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41. Pyranometer - solar radiation
  A.  Altimeter
  B.  Colorimeter
  C.  Barometer
  D.  Pyrometer
     
   
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42. Cathetometer - Vertical distances:
  A.  Angles
  B.  Frequency of electromagnetic waves
  C.  Distance travelled by a vehicle
  D.  Speed of a vehicle
     
   
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43. Breathalyzer - breath alcohol content
  A.  Frequency of electromagnetic waves
  B.  Intensity of sound
  C.  Atmospheric Humidity
  D.  Atmospheric pressure
     
   
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44. Spirometer - the lung capacity
  A.  Electric potential difference
  B.  Strength of electric current
  C.  Resistance of electric current
  D.  Diameter of small wires
     
   
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45. Gas pycnometer - volume and density of solids
  A.  Direction and range of an aeroplane
  B.  Altitudes and angles in navigation
  C.  Objects above sea level
  D.  Distant objects in space
     
   
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46. Barkometer - tanning liquors used in tanning leather
  A.  Measure electrical power
  B.  Measure Maganetic flux
  C.  Convert mechanical energy into electrical energy
  D.  Change in volume of substances
     
   
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47. Rheometer - response to applied forces
  A.  Trace movements of the heart
  B.  Convert sound waves into electrical vibrations
  C.  To measure magnetic flux
  D.  To measure and record electrical activity of brain
     
   
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48. Pycnometer - fluid density
  A.  Machmeter
  B.  Lactometer
  C.  Fluxmeter
  D.  Tonometer
     
   
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49. Dialtometer - volume changes caused by a physical or chemical process
  A.  Audiometer
  B.  Anemometer
  C.  Audiophone
  D.  Microphone
     
   
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50. Zymometer - fermentation
  A.  Heat radiation
  B.  Depth of ocean
  C.  Density of liquids
  D.  level of humidity
     
   
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