ISRO CSE 2018 | Question: 61

Question

The Operating System of a computer may periodically collect all the free memory space to form contiguous block of free space. This is called:

1. Concatenation
2. Garbage Collection
3. Collision
4. Dynamic Memory Allocation

Comments

what is difference between Garbage Collection and Compaction??

 

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Garbage collection = identify and remove memory that is no longer being used.

Concatenation = combine separate free spaces into one contiguous free block.

Just because of the word 'periodically' answer might be chosen as Garbage collection

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@Hatim @shriverdhan Compaction is an optional substep of Garbage collection (example = ZGC). Main role of Garbage collector is to "reclaim" free spaces of memory. If compaction was in the options, answer would still be the same. And if the question didn't have "may" then it doesn't have any answer.

Answer 1

Answer Is B.

It is job of Garbage collector to collect all free memory space at one place.

Answer 2

(B) Garbage Collection

Answer 3

B.Garbage Collector

Answer 4

ANSWER: B     Garbage Collection

Explanation: 

      

In order to use memory, programs conduct an action called "allocation" where part of the memory is set aside for a particular use. The C malloc() function and its counterpart calloc() are used to allocate memory. When this memory is no longer needed, it is freed with the free() function. The prototypes for both functions are available in stdlib.h. However, as memory is allocated and freed in various locations, the memory can become fragmented. Sometimes requests to allocate memory will fail as a result. The areas that are causing the allocation  problems are referred to as "garbage" for historic reasons. "Garbage collection" is the process of moving allocated memory around to make larger contiguous blocks available (like defragmenting your hard disk). However, due to very low priority for C and C++.

Answer 5

It is previous year UGC NET MCQ. 
link to the question: https://compscibits.com/Data-Structures/Arrays-and-Pointers/discussion/6414
The answer is option B. Garbage Collection.

Answer 6

b.garbage collection