AV nodal delay is:: (A) 0.2 sec, (B) 0.13 sec, (C) 0.01 sec, (D) 0.3 sec
Answer is B. Velocity of impulses at different parts of conductive system:

Atrial muscle fibers : 0.3 meter/second
Internodal fibers : 1.0 meter/second
AV node : 0.05 meter/second
Bundle of His : 0.12 meter/second
Purkinje fibers : 4.0 meter/second
Ventricular muscle fibers : 0.5 meter/second

Thus, the velocity of impulses is maximum in Purkinje fibers and minimum at AV node.