Siri voice is not audible

Hi 2011__,

Welcome to the Apple (user-to-user) Community.

Re: When I ask Siri I can’t able to hear Siri.

Wondering. if you need to raise the volume ...

In this discussion thread:

Seri voice is mute - Apple Community

answer says:

"You can only raise or lower the volume of Siri's voice while it is active. Invoke Siri.

While the multi-colored swirly thing is on the screen, use the volume buttons to raise the volume".

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Another way would be to have Siri reply with words on the screen, rather than words spoken in response.

Apple Support's article:

Change Siri settings on iPhone – Apple Support

says:

Change how Siri responds

Siri can respond out loud or silently (with text onscreen).

You can also see your request onscreen.

Go to Settings  > Siri & Search, then do any of the following:

✽. Change when Siri provides voice responses: 

Tap Siri Responses, then choose an option below Spoken Responses.

✽. Always see the response from Siri onscreen: 

Tap Siri Responses, then turn on Always Show Siri Captions.

✽. See your request onscreen: 

Tap Siri Responses, then turn on Always Show Speech.

Hoping one or other method can help:

All the best :-)