Page does not scroll to top when i route from one component to other in angular 4(now 5)?

I am using angular 5 and cli version is 1.5.2 and i am facing issues with routing.

When navigating from one route to another then scrolling down a bit and navigate back to the previous route, the page remains at the same scroll position. Currently navigate from one view to another then scroll down a bit and navigate back to the previous view. the page remains at the same scroll position.

But i need page to be scrolled to the top when navigating from one route to another.

Also i need to know whether this is the default routing behaviour in angular?

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