1.What is the main reason that data and computer programs stored on disk or thum

Question

1.What is the main reason that data and computer programs stored on disk or thumb drive, rather than in main memory where they can be accessed faster? A. Disks and thumb drives are portable; main memory is not B. You can store more on disks or thumb drives than you can on main memory C. Main memory is volatile D. Disks and thumb drives are less expensive than main memory


2.

5.A single search of a database retrieved a total of 1,478 items. Of these, 123 pertain to the topic being studied. What is the value of the precision of this search?

A. 8.3%

B. 9.08%

C. 12.02%

D. 120%

E. Precision cannot be calculated from this information

Explanation / Answer

1.

The correct answer is option C and the reason is:

The main reason is main memory is dynamic in nature and is volatile type of memory, so in case of power interrupt the data will be erased and sometimes data is very critical, so it is a convention and a thumb rule that the data and computer programs must be stored on hard disk instead on main memory. Secondary reason behind this is that main memory is very small in size and lot of background operations of Operating System runs in parallel in main memory so it is often suggested to save data in physical memory.

2.

The correct option is E and the reason is:

The sql query will only works on condition what condition is passed on in the where clause, and precision is based on what information is required and what the query results out.

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