When was India divided into many states on linguistic basis

When the World Literacy Day is Celebrated 

The river that originate from the Aravalli range is 

Consider the following statement.

Assertion (A) : Air currents in the upper layers of the atmosphere is known as Jet streams.

Reasoning (R) : It determines the arrival and departure of monsoon winds in India.

Select your answer.

Number of elected members to Lok Sabha from union territories is 

K. Kamaraj tendered resignation of chief ministership in 1963 due to