किस राज्य को एतिहासिक रूप से 'भारत का कोहिनूर' के रूप में जाना जाता था?

Who among the following founded the 'Forward Bloc'?

Which of the following statements regarding the Harappan Civilization is NOT correct?

Which ruler is generally credited with unifying much of Northern India under a single empire for the first time?