Key Board not working properly

@RavindraB I recommend you attempt the below steps to identify the cause of the failure and resolve it accordingly:

Try changing the keyboard layout/language and check if it works: Click here for steps.
Clean the keyboard with compressed air (blow compressed air in the gaps between keys). This removes some lint and dust. 
Shut down the laptop, remove the battery and cable for a moment, press and hold the start button for 60 seconds
Replace the battery, restart the notebook,
if the issue persists, perform an interactive hardware test on the keyboard using the steps mentioned on this link: Click here (look under “Running Component Tests > Keyboard test”).

P.S: Welcome to HP Community 😉
 
Let me know how that pans out,
If you feel I was helpful, simply click on Accept as Solution to help the community grow,
That said, I will have someone follow-up on this to ensure you’ve been helped,
Just in case you don’t get back to us within 24 – 48hrs, and have a good day, ahead.