| 1. Clear sky |
| 2. Calm air |
| 3. Low relative humidity |
| 4. Temperature below freezing point |
A) 1, 2 and 3
B) 1, 2 and 4
C) 2, 3 and 4
D) 1, 3 and 4
Correct Answer: B
Solution :
When relative humidity is low sufficient moisture is not available in the air and frost is not formed.
You need to login to perform this action.
You will be redirected in
3 sec
