761. OS has 13 tape drives. P1 needs11(has6),P2 needs5(has3),P3 needs8(has2). Safe sequence ?

Operating System • Deadlock avoidance • UGC NET Paper 2 Computer Science DEC 2013

762. Disk with 40 cylinders. Seek to 11, then requests 1,36,16,34,9,12. Arm motions under SSF =

Operating System • Disk scheduling • UGC NET Paper 2 Computer Science DEC 2013

763. In distributed computing, DSM is

Operating System • Distributed systems • UGC NET Paper 2 Computer Science DEC 2013

764. Which is NOT a distributed computing model?

Operating System • Distributed systems • UGC NET Paper 2 Computer Science DEC 2013

765. How many blocks to list free blocks on 16 GB disk with 1 KB blocks and 32-bit block numbers?

Operating System • File systems • UGC NET Paper 2 Computer Science DEC 2013

766. Which Windows has built-in partition manager to shrink/expand drives?

Operating System • Operating systems • UGC NET Paper 2 Computer Science DEC 2013

767. Monitor IPC is

Operating System • Synchronization • UGC NET Paper 2 Computer Science DEC 2013

768. Processors P₁…P_k execute in parallel iff Bernstein’s conditions hold pairwise: which?

Operating System • Concurrency • UGC NET Paper 2 Computer Science DEC 2013

769. With semaphores S=Q=1, P1 does wait(S),wait(Q); P2 does wait(Q),wait(S); then signals—this can cause

Operating System • Concurrency • UGC NET Paper 2 Computer Science DEC 2013

770. User–kernel switch time T₁ vs. process–process switch T₂: which is larger?

Operating System • Context Switching • UGC NET Paper 2 Computer Science DEC 2013

771. Processes A,B,C,D arrive at 0,1,2,3 with CPU 8,4,9,5 and RR quantum=4 ms. Average turnaround is

Operating System • CPU Scheduling • UGC NET Paper 2 Computer Science DEC 2013

772. Ten identical resources; P1,P2,P3 max(4,5,8); allocated state1=(2,3,4); state2=(0,2,4). State1/2 are

Operating System • Deadlock Avoidance • UGC NET Paper 2 Computer Science DEC 2013

773. For FCFS disk queue [98,37,14,124,65,67] starting at 32, total head moves =

Operating System • Disk scheduling • UGC NET Paper 2 Computer Science DEC 2013

774. The mv command changes

Operating System • File systems • UGC NET Paper 2 Computer Science DEC 2013

775. UNIX inode with 10 direct, 1 single, double, triple indirect pointers; 1 KB blocks; 4-byte addresses → max file size ≈

Operating System • File Systems • UGC NET Paper 2 Computer Science DEC 2013

776. Windows XP/Vista use which file system?

Operating System • File Systems • UGC NET Paper 2 Computer Science DEC 2013

777. A VM algorithm which partially swaps out a process is example of

Operating System • Memory management • UGC NET Paper 2 Computer Science DEC 2013

778. Job refs ABACABDBACD with 2 frames: page faults under FIFO & LRU are

Operating System • Memory Management • UGC NET Paper 2 Computer Science DEC 2013

779. A thread is “lightweight” because OS does not maintain which per-thread state?

Operating System • Threads • UGC NET Paper 2 Computer Science DEC 2013

780. Page-fault service 10 ms, mem access 20 ns, one fault per 10⁶ accesses. EAT =

Operating System • Virtual memory • UGC NET Paper 2 Computer Science DEC 2013