A.
Ancient irrigation technique
B.
Ancient medicinal practice
C.
Nuclear ballistic submarine
D.
Septic tank/manhole cleaning robot
A.
Uttar Pradesh
B.
Chhattisgarh
C.
Jharkhand
D.
Gujarat
A.
IIT Bombay
B.
IIT Roorkee
C.
IIT Kanpur
D.
IIT Guwahati