Free Bachelor of Computer Science Degree MCQ Questions and Answers

Question 1

The bank will request your phone number when you visit to open a new account so they can link it to your account in the event of an incident. Which of the following best sums up the justification?

Accepted Answer

It is done to set up multi-factor authentication

Answer

Providing a phone number when opening a new bank account is primarily done to set up multi-factor authentication (MFA). MFA adds an essential layer of security by requiring more than one method of verification, such as a password combined with a one-time code sent to the registered phone. This significantly enhances account protection against unauthorized access, as an attacker would need both the password and access to the phone.

Question 2

In order to quickly complete all tasks by dividing the vast amount of data into smaller pieces and distributing them to different computer equipment for sequential processing, an organization has built up a parallel computing system.
The company, however, requests that its staff refrain from connecting any new devices to the system. If the company decides against further segmenting the tasks, what could be a potential justification for the restriction?

Accepted Answer

Additional devices do not increase the speed of the sequential processing

Answer

The problem states that the organization has built a parallel computing system to divide data for *sequential processing* on different equipment. If the company decides against further segmenting tasks, it implies that the remaining processing steps are inherently sequential and cannot be broken down further for parallel execution. In such a scenario, adding more devices to the parallel system will not improve the speed of these specific sequential parts of the task, as they must be completed one after another regardless of available hardware.

Question 3

Which of the following codes, when run, will result in a TRUE statement?

Accepted Answer

((true OR false) AND NOT (false OR NOT (true))

Answer

Let's evaluate the expression step-by-step. First, `(true OR false)` simplifies to `true`. Next, `NOT (true)` is `false`, so `(false OR NOT (true))` becomes `(false OR false)`, which is `false`. Applying `NOT` again, `NOT (false OR NOT (true))` evaluates to `NOT (false)`, which is `true`. Finally, combining the simplified parts, `true AND true` results in a `TRUE` statement.

Question 4

You create a program that enables you to do several mathematical operations (such as addition, subtraction, multiplication, and division) on a collection of integers taken from a database.
The real test results, however, return a random value, which makes you believe that your code contains a randomizing variable.

Accepted Answer

Rerunning the code

Answer

If the test results return a 'random value' and you suspect a 'randomizing variable,' the most direct way to confirm this behavior is to rerun the code multiple times. If the output consistently changes with each execution, it provides strong evidence that a random or non-deterministic element is influencing the results. While other debugging methods can help locate the variable, rerunning the code directly demonstrates the suspected random behavior.

Question 5

On a computer, musicians record their songs. They are disappointed by the lower-than-expected sound quality they hear when they play back a digital copy of their song. Which of the following might explain why this discrepancy might exist?

Accepted Answer

The song file was saved with lower bits per second

Answer

Digital audio quality is directly correlated with the bitrate, which is the amount of data processed per unit of time, often measured in bits per second (bps). Saving a song file with a lower bitrate means less data is used to represent the sound, leading to a loss of detail and fidelity. This reduction in information results in a lower perceived sound quality during playback compared to the original recording.

BCS - Bachelor Of Computer Science Degree Practice Test

BCS - Bachelor Of Computer Science Degree Practice Test

Free Bachelor of Computer Science Degree MCQ Questions and Answers