This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Kata thermometer measures 
Select and explain. 
A. Air temperature only, B. Air temperature, humidity and air movement, C. Air temperature and humidity, D. Air velocity only
B: Air temperature, humidity and air movement
Answer: B: Air temperature, humidity and air movement 
Explanation: Kata thermometer measures ‘cooling power of air’: Cooling power of air comprises of

– Air temperature
– Humidity
– Air movement

Kata thermometer readings as indices of thermal comfort:

– Dry kata reading > 6 (Thermal comfort)
– Wet kata reading > 20 (Thermal comfort)

Nowadays it is used to record low air velocity.