BPSC TRE – OS: Deadlocks, Memory Management & Virtual Memory

Question 21

MCQ · Single Correct 1 mark

Which statement accurately describes the difference between Paging and Segmentation?

A Paging suffers from external fragmentation, whereas Segmentation suffers from internal fragmentation. B Paging divides memory into fixed-size physical blocks, while Segmentation divides memory into variable-size logical units reflecting the programmer's view. C Paging requires hardware support, while Segmentation is purely a software trick. D More than one of the above E None of the above

Question 22

MCQ · Single Correct 1 mark

What entry in a Page Table Entry (PTE) indicates whether a page is currently present in physical RAM or residing on secondary disk storage?

A Dirty (Modified) Bit B Reference Bit C Valid-Invalid (Present/Absent) Bit D More than one of the above E None of the above

Question 23

MCQ · Single Correct 1 mark

What is the primary function of the Translation Lookaside Buffer (TLB)?

A A secondary storage swap space on hard drives B A high-speed associative hardware cache used to speed up virtual-to-physical address translation C A software queue managing process priority in CPU scheduling D More than one of the above E None of the above

Question 24

MCQ · Single Correct 1 mark

Calculate Effective Access Time (EAT) given: TLB Hit Ratio = 80%, TLB Search Time = 20 ns, Main Memory Access Time = 100 ns.

A 140 ns B 120 ns C 200 ns D More than one of the above E None of the above

Question 25

MCQ · Single Correct 1 mark

In Segmentation, what happens if an offset 'd' in an address (s, d) exceeds the Limit value stored in the Segment Table?

A A Segment Fault (Trap to OS / Protection Exception) is triggered. B The offset wraps around automatically to zero. C The OS dynamically expands the segment size. D More than one of the above E None of the above