External critique is carried out by assessing a source's physical qualities. True. It is the process of determining the authenticity of evidence by studying its physical qualities, the period it was made, and the materials used. False. External criticism does not mean that only evidence which is physically apparent should be considered valid. Evidence which cannot be seen or felt but which may still be authentic includes testimony, letters, and documents. These items must be examined carefully to determine their truthfulness. The method for doing this is called internal criticism. Internal criticism involves questioning witnesses and other sources of information to determine their reliability and trustworthiness. This can also include questions about their motives for giving evidence. For example, if someone offers evidence against another person then there might be a reason for them to do so; perhaps they are in conflict with him/herself. Internal criticism allows for evidence that may not be apparent to the eye or mind to still be taken into account. In conclusion, external criticism is done by examining the physical qualities of a source. This includes evidence such as witness statements, photographs, and documents.