Questions

Bengaluru has became the second city in the country, and the first in south India, to have a full-fledged Metro rail in operation following the opening of a final 12-km section of the 42-km first phase of the Metro project. The first phase, comprising an 18-km east-west line and a 24-km north-south line, built at a cost of Rs 13,845 crore, was dedicated to the nation by President Pranab Mukherjee at an event in Bengaluru.

This difference proves that the earth is flattened at the poles and is thus, not a perfect sphere. The shape is reffered to as "geoid"

The Doppler effect or Doppler shift is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. 

Arunachal Pradesh State has been declared as the Open Defecation Free state.

The 90oEast Ridge is aseismic, composed of volcanic rock it is about 1700 km long treading in a NNE direction into Bay of Bengal from the Indian Ocean.