1.What is a China Visa?
2.Why China visa has different types and categories?
3.Can I provide the consulate or embassy with a photocopy of my passport?
4.How long is a China visa valid?
5.Do I need a China Visa ?
6.I am going to Beijing, then to Hong Kong and back to Beijing China. Does this mean I must have a double-entry visa?

Validity of Visa
A single entry Chinese visa is valid for 3 months from the date of issue, and a double entry visa is valid for 6 months. A China visa holder must enter China before the expiration date for the visa to remain valid.
Duration of Stay
The duration of stay is specified on a Chinese visa. Chinese visa holders must not stay beyond the specified date without extending their visas. Otherwise, they will be subject to stiff penalties.