51. Dew point normally occurs when a mass of air has a relative humidity of

1. 1. 50%

   
   
   

   2. 75%

   
   
   

   3. 80%

   
   
   

   4. 100%

   
   
   

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   NA

   Correct Option: D

   NA

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52. Relative humidity of atmosphere is measured by

1. 1. Hydrometer

   
   
   

   2. Hygrometer

   
   
   

   3. Potentiometer

   
   
   

   4. Lactometer

   
   
   

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   NA

   Correct Option: A

   NA

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53. Which the following is the temperature at which water vapour saturates from an air mass into liquid or solid usually forming rain, snow frost, on dew ?

1. 1. Dew point

   
   
   

   2. Specific humidity

   
   
   

   3. Frost point

   
   
   

   4. Humidity during rain

   
   
   

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   NA

   Correct Option: A

   NA

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54. Which term is used to describe the amount of water vapour that exists in a gaseous mixture of air and water vapour.

1. 1. Absolute Humidity

   
   
   

   2. Specific Humidity

   
   
   

   3. Dynamic Humidity

   
   
   

   4. Relative Humidity

   
   
   

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   NA

   Correct Option: D

   NA

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55. A device used to measure humidity is called a

1. 1. Psychrometer

   
   
   

   2. Hygrometer

   
   
   

   3. Both

   
   
   

   4. None

   
   
   

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   NA

   Correct Option: C

   NA

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