Answer
(a) It is true.
(b) It is false.
Work Step by Step
(a) It is true. Because in scalar line integral the integrand is a scalar function.
(b) It is false. In vector line integral the integrand is a vector function, so it changes sign if we reverse the orientation of the curve. But in scalar line integral the integrand is a scalar function, so it does not change sign if we reverse the orientation of the curve.
