Child Witnesses : Reliability of their Evidence
All persons are competent to testify as a witness under Section 118 of the Indian Evidence Act.
But a person who is unable to understand the question put to him or to give relational answer to the question owning to tender age, extreme old age, disease of mind or body or any other cause is not a competent witness.
In criminal case, the basic test of competence is whether the person is able to understand questions put to him as a witness and give answers to them which can be understood.