Services Plans and Contracts

Adding a clause in a contract that if a person does not complete the work by a certain time then he will be fined and will not receive a salary

Q: I did a job in a company that gave me a project for a week with a guideline that if I complete this project within 7 days, they will pay my salary otherwise I'll have to pay some charges if I am not able to complete my task. Is this okay?

Accepting fuel allowance for a month from a company even if one does not require it

Q: If a person is under employment (working for someone) and fuel allowance is also included in the contract (given in cash), however, if a month/week comes wherein the employee has enough fuel in the vehicle and therefore, for that particular month/week, he feels that he doesn’t need the fuel, should he still accept the cash or not, because it is in the contract? 

Using one's work computer for personal work if one has free time

Q: I am a government employee. I work on the computer. Often, there is little work and most of the time we are free. My questions are: 

1. Can I use the Govt. computer and internet for further learning advanced technologies?

2. Can I use it for listening to Islamic lectures?

3. Can I use it for work with some other companies as most the time I have no work to do?

Furthermore, the internet service is free and does not incur extra charges.