Yes , microphone is also mandatory as well as Camera access, if you have a problem with your pc/laptop ,then kindly use Mobile phone (Smartphone)

also do not insert or use any kind of headphone/earphone during the exam

i will provide link below that is about frequently asked questions at NLAT official site

Frequently asked questions about NLAT Exam (https://www.nls.ac.in/admissions/nlat-2020-faqs/)

kindly please visit site