Which is the river that crosses the Tropic of Cancer twice?

The secretion of which hormone increases the heart rate and starts feeling excited?

India's national sport is?

Who introduced the market rules / price control system in Indian history?

Which is the correct ascending hierarchy of groups of taxonomy in taxonomy?

Where is the railway unit making wheels and axles located?

An acid must contain mainly one atom which reacts with the metal to produce a gas.

Who demarcated India and Pakistan?