Which is the cheapest and best way to transport heavy objects?

Which type of energy is used for moving the bicycles?

The metro rail is seen in

When was Air India started?

Narrow gauge tracks are used in the areas of

The 'lifetime' of our country are

Grand Trunk road was built during the period of 

Which railway system is the largest in Asia?

Which is the cheap and comfortable mode of transport?

Which one of the following carry both goods and passengers?