बिहार में सर्वाधिक लम्बा राष्ट्रीय राजमार्ग है - The longest national highway in Bihar is - Bihar Me Sarwaadhik Lamba Rashtriya RajMarg Hai Bihar Gk in hindi, Government Schemes NH - 30 question answers in hindi pdf NH - 77 questions in hindi, Know About NH - 31 Bihar Gk online test Bihar Gk notes in hindi quiz book NH - 19