Greetings sumeshSaini,
Thanks for participating in the Apple Support Communities.
It sounds like you just see a spinning circle when trying to install or update apps on your iPhone 5.
If you haven't already, first try restarting your iPhone by holding down the Sleep/Wake button and then sliding the slider to power off:
Restart or reset your iPhone, iPad, or iPod touch - Apple Support
If the same thing happens after you restart your iPhone, try signing out of the App Store, signing back in, and trying to download an app again.
Tap Settings > iTunes & App Store and then tap your Apple ID to sign out. Then sign back in by entering your Apple ID and password and tapping Sign In.
iOS: Sign in with a different Apple ID in the iTunes Store, App Store, and iBooks Store - Apple Support
Best Regards,
Jeremy