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I have this one if any can help:
A large cumulus cloud with a base of 2000 ft is reported at an airfield,if the surface temperature is 21 degrees celsius the height of the freezing level in the cloud is likely to be:
A) 10330 feet
B) 7000 feet
C) 10500 feet
D) 18000 feet
The freezing level in a cloud is calculated by using the the standard lapse rate 2celc./1000'. In your case however, the freezing level (i.e temp reaches 0 from the surface temp of 21 celcius ) at an altitude of 10,500' or 10,600 to be more precise .
The answer in my opinion would be (c) .