操作系统选择题库答案及详解_Multiple Choice Questions 11

Multiple Choice Questions 11
Question1
A file is generally defined to be:
选择一个答案

a. All of the above

b. A collection of related fields

c. A basic element of data

d. A collection of similar records √

Question2
Fixed file blocking experiences the following potential problem:
选择一个答案

a. External fragmentation

b. None of the above

c. Internal fragmentation √

d. Gaps due to hardware design

Question3
In which of the following file allocation methods is preallocation required:
选择一个答案

a. Indexed

b. None of the above

c. Chained

d. Contiguous √

Question4
The technique of free disk space management that employs a pointer and length value of each free portion is the:
选择一个答案

a. None of the above √

b. Free block list

c. Bit tables

d. Indexing

Question5
The data structure that maintains information on available disk space is called the:
选择一个答案

a. File Allocation Table (FAT)

b. None of the above

c. Bit Table

d. Disk Allocation Table √

Question6
File allocation in a UNIX system has the following characteristics:
选择一个答案

a. Dynamic allocation using non-contiguous blocks with indexing √

b. Preallocation using non-contiguous blocks without indexing

c. None of the above

d. Dynamic allocation using contiguous blocks without indexing

Question7
In a W2K NTFS file system, the smallest physical storage unit on the disk (almost always 512 bytes) is called a:
选择一个答案

a. Cluster

b. Volume

c. Sector √

d. None of the above

Question8
The level of the file system architecture that enables users and applications to access file records is called the:
选择一个答案

a. Logical I/O level √

b. All of the above

c. Basic I/O supervisor level

d. Basic file system level

Question9
Record access in a pile file can be conducted by:
选择一个答案

a. Key field

b. All of the above

c. Exhaustive search √

d. Partial index

Question10
Sequential files are optimal in scenarios involving:
选择一个答案

a. Applications that require infrequent updates

b. All of the above

c. Applications that require frequent queries

d. Applications that require the processing of all records in the file √

Question11
Indexed sequential files similar to sequential files, but contain two added features:
选择一个答案

a. File index and overflow file √

b. Hash function and an overflow file

c. All of the above

d. Hash function and file index

Question12
Direct or hashed files are often used where:
选择一个答案

a. Fixed length records are used

b. All of the above √

c. Very rapid access is required

d. Records are always accessed one at a time

Question13
The file directory information element that holds information such as the identity of the creator of the file is the:
选择一个答案

a. All of the above

b. Address information element

c. Usage information element √

d. Access control information element

Question14
In a tree-structured directory, the series of directory names that culminates in a file name is referred to as the:
选择一个答案

a. Pathname √

b. Working directory

c. None of the above

d. Symbolic name

Question15
Access rights on a file typically are considered to constitute a hierarchy, with each right implying those that:
选择一个答案

a. Precede it √

b. Succeed it

c. None of the above

d. Supercede it