Question 1

The quality of an audio file is determined by _____.

Accepted Answer

The quality of an audio file is determined by its bit rate, which refers to the amount of data processed per unit of time. A higher bit rate will generally result in better audio quality, while a lower bit rate will result in lower quality and potentially loss of data. Therefore, choice D (bit rate) is the correct answer.

Question 2

What development methodology repeatedly revisits the design phase?

Accepted Answer

Agile development methodology emphasizes iterative and incremental development where the design, development, and testing phases are revisited repeatedly to ensure that the final product meets the customer's requirements.

Question 3

A process called _____ converts analog sound waves into digital sound.

Accepted Answer

Sampling is the process of converting analog sound waves into digital sound by taking small snapshots, or samples, of the sound wave at regular intervals. These samples are then converted into digital data that can be stored and manipulated on a computer.

Question 4

Trevor has created an app that tracks fitness activities over time and generates statistics that users can share with their doctors.He's decided to make it open source so other developers can contribute to the app's evolution.How can Trevor make his code accessible to other developers who might want to participate?

Accepted Answer

Posting the source code to a code repository is the best way to make it accessible to other developers. This allows them to clone the code, make changes, and propose additions or improvements. Services like GitHub and BitBucket offer free code repositories for open source projects. Posting the code to an integrated development environment (A) is not necessary and can limit the accessibility. Emailing the code to friends (B) is not an efficient way to share the code with a wide audience of developers. Creating the code in a code editor (D) is simply a tool for writing the code, but it does not help to make it accessible to others.

Question 5

A series of images displayed in sequence to create the illusion of movement is called ______________ .

Accepted Answer

A series of images displayed in sequence to create the illusion of movement is called animation.

Question 6

Jason just received a prototype of the app he hired a team to develop for him.What phase of the SDLC is this project in?

Accepted Answer

The answer of Jason just received a prototype of the...

Question 7

Sergei's team is developing a new tracking app for a delivery company's fleet of trucks.The team plans to begin with a simple app, and then gradually add features over time.Which development methodology would be the best fit for this approach?

Accepted Answer

Agile development methodology would be the best fit for this approach as it allows for flexibility and iterative development, which is ideal for gradually adding features over time. The team can continuously incorporate feedback from the delivery company and make necessary changes to the app as they go, rather than waiting until the end of the development cycle.

Question 8

Missy just hired a software development team to create an educational simulation app for a high school course.She has specific requirements for how the app should respond to user actions.How can she communicate her specifications to the software developers?

Accepted Answer

Drawing wireframes is the best choice as it is a visual representation of the app's interface and functionalities. It helps in communicating design ideas, user flow, and specifications to developers. Testimonials from teenagers or a video might not be as effective in communicating specific technical requirements. Design slides for a presentation might not be detailed enough to communicate the specific requirements.

Question 9

Mack signs into his laptop and gets a message saying all his files have been encrypted and will only be released if he sends money to the attacker.What kind of software did this?

Accepted Answer

The message that Mack received indicates that his files have been encrypted and will only be released if he pays a certain amount of money, which is typical behavior of ransomware. The other choices (spyware, antivirus, and spam) are not relevant to the scenario described.

Question 10

Which software development role would most likely be filled by someone with an art background?

Accepted Answer

A person with an art background can bring a sense of creativity and design to the development process, making them a good fit for a designer role.

Question 11

During which software development phase do users begin using an app?

Accepted Answer

Users typically begin using an app during the implementation phase, which involves actual coding and building of the software product. The earlier phases (design and analysis) focus on planning and conceptualizing the app, while the support and security phase comes after the app has been released and is being maintained.

Question 12

Digital audio can be created by recording sound on a smartphone.

Accepted Answer

Yes, digital audio can be created by recording sound on a smartphone using built-in microphones or external microphones that can be plugged in through the headphone jack or lightning port.

Question 13

Resolution of bitmap graphics is typically measured in ___________.

Accepted Answer

Resolution of bitmap graphics is typically measured in pixels, which are the individual dots that make up the image. Megabytes and kilobytes refer to file size, while frames are typically used to measure frequency in video content.

Question 14

Which of these programming languages would likely be the most difficult to learn?

Accepted Answer

Assembly language is known for being one of the most difficult programming languages to learn due to its low-level structure and lack of abstraction from the computer's hardware. It requires a deep understanding of computer architecture and memory management. The other languages listed (Python, SQL, and Ruby) are generally considered to be more beginner-friendly.

Question 15

Sherry is concerned that a new app her team is developing might not meet the customer's schedule.What can her team do to determine whether they can complete the project on time or should scale back features in the app?

Accepted Answer

Completing a feasibility study would allow a team to determine the project's timelines and identify potential issues that might arise during the development process. If the study determines that the app cannot be completed on time with the current resources and planned features, the team can then consider scaling back features to ensure timely completion.

Question 16

What two factors determine the quality of digital audio?

Accepted Answer

Sampling rate and bit rate are the two factors that determine the quality of digital audio. The sampling rate refers to the number of times per second that the audio is sampled, while the bit rate refers to the amount of data used to encode the audio. Higher sampling and bit rates generally result in better quality audio. Resolution and compression rate are factors that determine the quality of digital images, not audio. Codec and container type are related to the format in which digital audio is stored and transmitted, but they do not directly affect its quality. Frame rate and volume are also not factors that determine the quality of digital audio.

Question 17

Which of the following audio formats does not use any compression technique?

Accepted Answer

WAV is a raw audio format that does not use any compression technique, unlike MP4, MP3, and WMA which use various compression methods to reduce file size.

Question 18

A bitmap image is provided in two different resolutions.Image 1 has a resolution of 1500 x 1225.Image 2 has a resolution of 500 x 350.Which of the following statements is true when the sizes of both the files are increased by 25 percent?

Accepted Answer

When both images are increased in size by 25%, the number of pixels in each image increases by (1 + 0.25) x (1 + 0.25) = 1.56 times.

For image 1, the new resolution would be 1500 x 1225 x 1.56 = 2925 x 1912.5
For image 2, the new resolution would be 500 x 350 x 1.56 = 780 x 546.

Since image 1 has a higher resolution than image 2, it will continue to have a larger file size after the 25% increase. Additionally, since image 1 was already larger and sharper to begin with, it will still be sharper than image 2 after the increase. Therefore, the correct choice is C.

Question 19

Talis shoots a photo with his 20 megapixel digital camera.How is the image stored as digital data?

Accepted Answer

The image is stored as digital data by breaking down the image into millions of tiny pixels, each with a specific color value. Each pixel is then represented by a binary code made up of 1s and 0s, which corresponds to a specific color. Therefore, the image is stored as a list of binary color numbers for all the pixels it contains.

Question 20

A digital video that uses the MPEG-4 codec is often used by online streaming services.

Accepted Answer

This statement is true. MPEG-4 is one of the most commonly used codecs for compressing digital videos for online streaming services.

Quiz 10: Exam