Correct Answer : 27°c
Explanation : The hydrometer are generally calibrated at 27°c if the temperature is more than 27°c, temperature correction will be taken negative. If less than 27°c then the temperature correction will be positive.
Correct Answer : Option (D) : plasticity
Correct Answer : Option (C) : perpendicular to equipotential lines
Correct Answer : Option (B) : water content