What is Domain?

• A. Domain = set of all objects
• B. It is a collection of protection policies
• C. Domain= set of access-rights
• D. None of the mentioned

What does the access matrix represent?

• A. Rows-domains, columns-objects
• B. Rows-objects, columns-domains
• C. Rows-access list, columns-domains
• D. Rows-domains, columns-access list

What are the three additional operations to change the contents of the access-matrix?

• A. Copy
• B. Owner
• C. Control
• D. All of the mentioned

Who can add new rights and remove some rights?

• A. Copy
• B. Transfer
• C. Limited copy
• D. Owner

What are the three copyrights?

• A. Copy
• B. Transfer
• C. Limited copy
• D. All of the mentioned

Which two rights allow a process to change the entries in a column?

• A. Copy and transfer
• B. Copy and owner
• C. Owner and transfer
• D. Deny and copy

Which is an unsolvable problem in access-matrix?

• A. Owner override
• B. Brute force
• C. Access denied
• D. Confinement

What is ‘separation’ in security of Operating systems?

• A. To have separate login for different users
• B. To have separate hard disk drive/partition for different users
• C. It means keeping one user’s objects separate from other users
• D. None of the mentioned

Which of the following statements are correct? i) Physical separation – in which process use different physical objects like separate printers ii) Physical separation – in which process having different security requirement at different times iii) Logical separation – In which users operate under illusion that no other processes exist iv) Logical separation – In which processes conceal their data and computations

• A. I
• B. I and iii
• C. Ii and iii
• D. Iii and iv

Which of the following statements are correct? i) Physical separation – in which process use different physical objects like separate printers ii) Temporal separation – in which process having different security requirement at different times iii) Physical separation – In which users operate under illusion that no other processes exist iv) Temporal separation – In which processes conceal their data and computations

• A. I
• B. I and ii
• C. Ii and iii
• D. Iii and iv