61. In which year, Chilarai managed to occupy the capital of Ahom, Garhgaon

(A) 1558
(B) 1561
(C) 1562
(D) 1563

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62. The average gradient of the Brahmaputra plain is

(A) 14 cm per km
(B) 16 cm per km
(C) 17 cm per km
(D) 19 cm per km

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63. The total length of the Brahmaputra river is

(A) 2856 km
(B) 2892 km
(C) 2900 Km
(D) 2953 km

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64. The total length of the Brahmaputra river in India is

(A) 916 km
(B) 925 km
(C) 936 Km
(D) 968 km

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65. When Petroleum was first discovered in Assam

(A) 1885
(B) 1889
(C) 1896
(D) 1901

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