The longest Railway Tunnel in Pakistan is Khojak Tunnel. It is located in

(A) Sindh
(B) Punjab
(C) Khyber Pakhtunkhwa
(D) Balochistan

The answer is: (D) Balochistan
Khojak Tunnel is located in Qilla Abdullah, Balochistan. It was featured in old banknote of 5 rupee.