Title OS MODEL SET I MCQ.pdf ✅

Tribhuvan University Bachelor in computer Application (BCA) Full Mark 60 Course Title: Operating System Pass Mark 24 Semester 4th Time: 3 hours MODEL SET I Group A Attempt all the questions. [101 = 10] Circle (O) the correct answer. i. A________ is a collection of electronics that can operate a port, a bus, or a device? (a) Controller (b) Driver (c) Host (d) Bus ii. The hardware mechanism that allows a device to notify the cpu is called _______? (a) Polling (b) Interrupt (c) Driver (d) Controlling iii. What is used to protect network from outside internet access? (a) A trusted Antivirus (b) 24 hours sacanning for virus (c) Firewall to seprate trusted and un-trusted network (d) Deny users access to websites which can potentially causes security leak. iv. How do viruses avoid basic pattern match of antivirus? (a) They are encrypted (b) They act with special permissions (c) They modify themselves (d) None of the mentioned v. What will happen in the two level directory structure? (a) Each user has his/her own user file directory (b) The system doesnot its own master file directory (c) All of the mentioned (d) None of the mentioned vi. in fixed size partition , the degree of multiprogramming is bounded by ________ (a) The number of partitions (b) The cpu utilizations (c) The memory size (d) All of the mentioned vii. A solution to the problem of external fragmentation is ________ (a) Compaction
(b) Larger memory space (c) Smaller memory space (d) None of the mentioned viii. The circular wait condition can be prevented by _________ (a) Defining a linear ordering of resource types (b) Using thread (c) Using pipes (d) All of the mentioned ix. Which one of the following is the dead lock avoidance algorithm? (a) Banker’s algorithm (b) Round-robin algorithm (c) Elevator algorithm (d) Karn’s algorithm x. What is the drawback of bankers algorithm? (a) In advance process rarely know howmuch resources they will need (b) The number of process change as time progress (c) Resource once available can disappear (d) All of the mentioned
Tribhuvan University Bachelor in computer Application (BCA) Full Mark 60 Course Title: Operating System Pass Mark 24 Semester 4th Time: 3 hours MODEL SET II Group A Attempt all the questions. [101 = 10] Circle (O) the correct answer. i. The cpu hardware has a write called _________ that the cpu Sense after executing every instruction. (a) Interrupt request line (b) Interrupt bus (c) Interrupt receive line (d) Interrupt sense line ii. The data structure used for file directory is called _______? (a) Mount table (b) Hash table (c) File table (d) Process table iii. In distributed systems, what will the transaction coordinator do? (a) Starts the execution of transaction (b) Breaks the transaction into number of sub transactions (c) Coordinates the termination of the transaction (d) All of the mentioned iv. What is not an important part of security Protection? (a) Large amount of RAM to support antivirus (b) Strong paswords (c) Audit log periodically (d) Scan for unauthorized programs in system directories v. What will happen in the single level directory? (a) All directories must have unique names (b) All files must have unique names (c) All files must have unique owners (d) All of the mentioned vi. External fragmentation will not occur when? (a) First fit is used (b) Best fit is used (c) Worst fit is used
(d) No Matter which algorithm is used, it will always occur vii. For an effective operating system, when to check for deadlock? (a) Every time a resource request is made (b) At fixed time interval (c) Every time a resource request is made at fixed time intervals. (d) None of the mentioned viii. To avoid deadlock________________________? (a) There must be a fixed number of resources to allocate (b) Resource allocation must be done only once (c) All deadlocked process must be aborted (d) Inversion technique can be used. ix. The request and release of resources are_____? (a) Command line statements (b) Interrupts (c) System calls (d) Special programs x. For a deadlock to arise, which of the following conditions must hold simultaneously? (a) Mutual Exclusion (b) No Preemption (c) Hold and wait (d) All of the mentioned