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66. 

The range of R.B.C to W.B.C in the human body is
A. 15 : 500
B. 10: 500
C. 5: 500
D. 1: 500
67. 

The official language of the Government of India is
A. English
B. मलयालम
C. हिंदी
D. मराठी
68. 

The number of chromosomes in human body is
A. 42
B. 44
C. 46
D. 48
69. 

The purest form of water can be obtained from
A. a deep tubewell
B. एक चल धारा
C. एक गर्म पानी वसंत
D. बारिश की एक भारी बौछार
70. 

The Netaji Subhas National Institute of Sports is located at
A. Bangalore
B. कोलकाता
C. दार्जिलिंग
D. पटियाला