D:-4g
Correct Answer:- Option-C
Question73:-The mean radiant temperature is measured by
A:-Dry Bulb Thermometer
B:-Web Bulb Thermometer
C:-Six's Maximum and Minimum Thermometer
D:-Globe Thermometer
Correct Answer:- Option-D
Question74:-All are features of septic tank except:
A:-Ideal Retention Period - 48 hours
B:-Minimum capacity - 500 gallons
C:-Aerobic oxidation takes place outside
D:-Sludge is solids settling down
Correct Answer:- Option-A
Question75:-Most hazardous pesticide color coding is
A:-Red
B:-Black
C:-Blue
D:-Yellow
Correct Answer:- Option-A

Question76:-The distance from airport or seaport which has to be kept free from
aedes mosquito is:

A:-400 m

B:-500 m

C:-1 km

D:-100 m

Correct Answer:- Option-A

Question77:-All the following statements are true about break point chlorination,
except

A:-Free chlorine is released in water after break point chlorination

B:-Chlorine demand is the amount needed to kill bacteria, oxidize organic
matter and neutralize ammonia

C:-1 ppm free chlorine should be present in water after break point
chlorination has reached

D:-Contact period of 1 hr is necessary
Correct Answer:- Option-C

Question78:-Proposed guideline values for radioactivity in Drinking water is