Lightbulb [Q] Canvas 4 Bootloader and ROM Queries

Hello everyone. So here's what I did. I rooted my canvas 4 using framaroot and it worked perfectly. I did not flash custom recovery and did not do anything else... My query is that... Is my bootloader unlocked ? Also, when you root does your bootloader get unlocked ? Or its a different concept ? Also, how do I check if my bootloader is locked or unlocked ?

Also I have heard that at the service center, they check your bootloader status and if it is unlocked, your warranty is voided... So is there a way to lock the bootloader ? I will be grateful to anyone who can answer these questions to my full satisfaction....