Please answer the quetions : Question 41 : Which of the following statements is

Question

Please answer the quetions :

Question 41 : Which of the following statements is true?

Question 41 options:

All multitasking operating systems implement virtual memory.

Multitasking time sharing operating systems can not perform batch processing.

A multitasking time sharing operating system contains a component called a scheduler which determines which of the processes or threads that are ready to run will actually run.

All multitasking operating systems are multi-user operating systems.

Question 42 : Which of the following statements is true?

Question 42 options:

All internet routers support both IPv4 and IPv6.

IPv4 defines more than 4 billion internet routable addresses.

Each IPv4 address identifies exactly one computer.

IPv4 uses 32 bits for each address, and IPv6 uses 128 bits for each address.

Question 43 : Which of the following regular expressions only matches variable names with all of the following rules?

1) Variable names must start with an alphabetic character or an underscore.

2) If a variable name starts with an underscore, the variable name must include at least one alphabetic character.

3) Variable names my include numbers at any position after the start.

Note: This question has one of the lowest correct answer rates of any question used in CEG2350 exams. Why is this? If the answer isn't obvious to you just by looking at the options, why don't you create some test cases and actually test each of the candidate regular expressions?

Question 43 options:

(^[a-zA-Z][a-zA-Z0-9_]*)|(^[_]+[a-zA-Z0-9_]*)

(.[a-zA-Z][a-zA-Z0-9_]*)|(^[_]*[a-zA-Z0-9_]$)

(^[a-zA-Z][a-zA-Z0-9_]*)|(^[_]+[0-9]*[a-zA-Z]+[a-zA-Z0-9_]*)

(.[a-zA-Z][a-zA-Z0-9_]*)|(^[_]+[a-zA-Z0-9_]*)

All multitasking operating systems implement virtual memory.

Multitasking time sharing operating systems can not perform batch processing.

A multitasking time sharing operating system contains a component called a scheduler which determines which of the processes or threads that are ready to run will actually run.

All multitasking operating systems are multi-user operating systems.

Explanation / Answer

41 a.

42 d.

43

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