Comp Sci Unit 2 #5

Three students in different locations are collaborating on the development of an application. Which of the following strategies is LEAST likely to facilitate collaboration among the students?

• Having all three students participate in frequent video chat sessions to discuss ideas about the project and to provide feedback on work done so far

• Having all three students use an online shared folder to contribute and discuss components to be considered for use in the application

• Having all three students write code independently and then having one student combine the code into a program

• Having all three students work in a shared document that each can edit to provide comments on the work in progress

A computer program uses 3 bits to represent integers. When the program adds the decimal (base 10) numbers 5 and 3, the result is 0. Which of the following is the best explanation for the result?

• An overflow error occurred.

• A round-off error occurred.

• The result was affected by lossy data compression.

• The result was approximated by a floating-point representation.

An office uses an application to assign work to its staff members. The application uses a binary sequence to represent each of 100 staff members. What is the minimum number of bits needed to assign a unique bit sequence to each staff member?

• 5

• 6

• 7

• 8

Consider the following code segment.

What are the values of first and second as a result of executing the code segment?

• The value of first is true, and the value of second is true.

• 
  The value of first is true, and the value of second is false.

• 
  The value of first is false, and the value of second is true.

• The value of first is false, and the value of second is false.

Which of the following is an advantage of a lossless compression algorithm over a lossy compression algorithm?

• A lossless compression algorithm can guarantee that compressed information is kept secure, while a lossy compression algorithm cannot.

• A lossless compression algorithm can guarantee reconstruction of original data, while a lossy compression algorithm cannot.

• A lossless compression algorithm typically allows for faster transmission speeds than does a lossy compression algorithm.

• A lossless compression algorithm typically provides a greater reduction in the number of bits stored or transmitted than does a lossy compression algorithm.

Consider the following code segment.

Which of the following describes the possible values of ans as a result of executing the code segment?

• 
  Any integer value from 1 to 8, inclusive

• 
  Any integer value from 1 to 16, inclusive

• Any integer value from 4 to 8, inclusive

• Any integer value from 7 to 16, inclusive

Consider the following code segment.

What are the values of first and second as a result of executing the code segment?

• first = 100, second = 100

• first = 100, second = 200

• first = 200, second = 100

• first = 200, second = 200

Which of the following code segments can be used to interchange the values of the variables num1 and num2 ?

• 
• 
• 
• 

Consider the following code segment.

What is displayed as a result of executing the code segment?

• 10 20 30 40

• 21 30 40 50

• 21 40 30 40

• 21 40 30 50

Consider the following code segment.

x ← 25

y ← 50

z ← 75

x ← y

y ← z

z ← x

Which of the variables have the value 50 after executing the code segment?

• 
  x only

• y only

• x and z only

• x, y, and z