《unix初级教程(第五版)(英文版)》Afzal_Chapter 1

Page 1

Directions: Read each of the following statements. If you think a statement is true, select True . If you think a statement is false, select False .

1. A multi-tasking operating system is capable of executing more than one program

at a time for a user.

a. True

b. False

2. A single-tasking operating system executes one program at a time for many

users.

a. True

b. False

3. A multi-user operating system is capable of providing services for many users

on the system concurrently.

a. True

b. False

4. In the operating system model the service layer translates the service requests

from users/programs and passes them to the kernel layer.

a. True

b. False

5. The command layer or shell responds to the set of commands that are supported

by the operating system.

a. True

b. False

6. The kernel is the outermost layer of the operating system, and it is the only

layer that interacts with the user.

a. True

b. False

7. ASCII code is one of the code schemes used to represent characters in a byte. a. True

b. False

8. Mb is about one million bytes.

a. True

b. False

9. Gb is about one billion bytes.

a. True

b. False

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