2018 MCQ

Front

The code segment below is intended to swap the values of the variables first and second using a temporary variable, temp.
temp <- first
first <- second

Which of the following can be used to replace so that the code segment works as intended? Options: second <- first, second <- temp, temp <- first, temp <- second

Back

second <- temp

Front

A bank customer receives an e-mail from a sender claiming to be a bank employee. The e-mail asks the customer to provide personal information and to call a phone number if he or she has any questions. The customer suspects the e-mail might be a phishing attempt. Which of the following responses is most likely to be a privacy risk for the bank customer? A) Calling the bank at its official phone number to ask whether the request for personal information is legitimate B) Calling the phone number given in the e-mail and providing the personal information over the phone C) Checking that the domain name of the sender’s e-mail address is associated with the bank D) Conducting a Web search to see if other people have received similar requests for personal information

Back

Calling the phone number given in the e-mail and providing the personal information over the phone.

Front

Which of the following would be the best use of citizen science? A An experiment that requires all participants to be working in the same laboratory, B An experiment that requires expensive equipment to conduct, C An experiment that requires data measurements to be taken in many different locations, D An experiment that requires specialized knowledge and training to conduct

Back

An experiment that requires data measurements to be taken in many different locations.

Front

A student is writing a program to model different real-world events using simulations. Which of the following simulations will generate a result that would best be stored using a Boolean variable? A simulation of flipping a fair coin, A simulation of rolling a fair die (with sides numbered 1 through 6), A simulation of the temperature in a location over time, A simulation of traffic patterns on a road

Back

A simulation of flipping a fair coin

Front

5
Options:
a
b
c
d

Back

c

Front

Which of the following best describes the role of the Internet Engineering Task Force (IETF)?
Options: Developing standards and protocols for Internet communication, Preventing copyrighted materials from being illegally distributed online, Preventing malicious software from being distributed online, Verifying the ownership of encrypted keys used in secured messages

Back

Developing standards and protocols for Internet communication

Front

Consider the following program, which uses the variables star, end, and current.
start <- 1
end <- 20
current <- 3
start <- current
current <- current + 1
DISPLAY (start)
DISPLAY (current)
What is displayed as a result of executing the program?

Back

3 4

Front

Which of the following best describes one of the benefits of using an iterative and incremental process of program development? It allows programmers to implement algorithmic solutions to otherwise unsolvable problems., It eliminates the need for programmers to test completed programs., It enables programmers to create programs that use the lowest-level abstractions available., It helps programmers identify errors as components are added to a working program.

Back

It helps programmers identify errors as components are added to a working program.

Front

The procedure DrawCircle (x, y, r) can be used to draw a circle on a coordinate grid. The circle is centered at the coordinate (x, y) and has a radius of r units. The procedure will be used to draw the following figure on a coordinate grid. Which of the following code can be used to draw the figure?

Back

xPos <- 3 yPos <- 6 REPEAT 3 TIMES { DrawCircle (xPos, yPos, 2) xPos <- xPos + 2 yPos <- yPos - 2 }

Answer explanation

Front

11
Options: a, b, c, d

Back

d