| 1. | Interrupts which are initiated by an instruction are |
| a. | Internal |
| b. | External |
| c. | Hardware |
| d. | Software |
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Answer: (d).Software
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| 2. | Resources are allocated to the process on non-sharable basis is |
| a. | mutual exclusion |
| b. | hold and wait |
| c. | no pre-emption |
| d. | circular wait |
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Answer: (a).mutual exclusion
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| 3. | If the disk head is located initially at 32, find the number of disk moves required with FCFS if the disk queue of I/O blocks requests are 98, 37, 14, 124, 65, 67. |
| a. | 239 |
| b. | 310 |
| c. | 321 |
| d. | 325 |
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Answer: (c).321
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| 4. | Given memory partitions of 100 K, 500 K, 200 K, 300 K and 600 K (in order) and processes of 212 K, 417 K, 112 K, and 426 K (in order), using the first-fit algorithm, in which partition would the process requiring 426 K be placed ? |
| a. | 500 K |
| b. | 200 K |
| c. | 300 K |
| d. | 600 K |
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Answer: (d).600 K
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| 5. | The problem of indefinite blockage of low-priority jobs in general priority scheduling algorithm can be solved using : |
| a. | Parity bit |
| b. | Aging |
| c. | Compaction |
| d. | Timer |
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Answer: (b).Aging
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| 6. | Which of the following memory allocation scheme suffers from external fragmentation ? |
| a. | Segmentation |
| b. | Pure demand paging |
| c. | Swapping |
| d. | Paging |
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Answer: (a).Segmentation
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| 7. | Match the following :
List – I List – II a. Critical region 1. Hoares Monitor b. Wait/signal 2. Mutual exclusion c. Working set 3. Principal of locality d. Dead lock 4. Circular wait Codes : a b c d |
| a. | 2 1 3 4 |
| b. | 1 2 4 3 |
| c. | 2 3 1 4 |
| d. | 1 3 2 4 |
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Answer: (a).2 1 3 4
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| 8. | Which of the following features will characterize an OS as multiprogrammed OS ?
(a) More than one program may be loaded into main memory at the same time. (b) If a program waits for certain event another program is immediately scheduled. (c) If the execution of a program terminates, another program is immediately scheduled. |
| a. | (a) only |
| b. | (a) and (b) only |
| c. | (a) and (c) only |
| d. | (a), (b) and (c) only |
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Answer: (d).(a), (b) and (c) only
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| 9. | A thread is a light weight process. In the above statement, weight refers to |
| a. | time |
| b. | number of resources |
| c. | speed |
| d. | All the above |
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Answer: (b).number of resources
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| 10. | Consider a system having m resources of the same type. These resources are shared by 3 processes A, B and C which have peak demands of 3, 4 and 6 respectively. For what value of m deadlock will not occur ? |
| a. | 7 |
| b. | 9 |
| c. | 10 |
| d. | 13 |
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Answer: (d).13
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