(1) Let A be a unit speed curve If ArT+xR, then x- (b) 7 (a) N (2) Ifa curve lies on a sphere of radius 5, then its cuEVature can not be -- at any point. (a) 0.1S (c) -N (d) -7 (b) 0.2 (c) 0.3 (3) Let a be a cylindrical helix with 8= Then the curvature of the spherical image (4) 2.5 of a is (a) 3 (b) 5 (c) 0 (d) 2 (4) The subset M of R' defined by x'+z' -4:=e is not a surface for e= (a) -4 (b) (c) 2 (d) 4