Question 1

The contents of a variable cannot be changed while the program is running.

Accepted Answer

The contents of a variable can be changed during the execution of a program. That's one of the primary purposes of using variables - to store and update values as the program runs.

Question 2

Colons are used to indicate the end of a Java statement.

Accepted Answer

Colons are not used to end Java statements. Semicolons are used for that purpose.

Question 3

When an object's internal data is hidden from outside code and access to that data is restricted to the object's methods, the data is protected from accidental corruption.

Accepted Answer

This is the definition of encapsulation in object-oriented programming, which aims to improve the reliability and security of code by limiting direct access to an object's data.

Question 4

Each byte is assigned a unique number known as an address.

Accepted Answer

Each byte in memory is assigned a unique address which is used to locate and access it.

Question 5

Logical errors are mistakes that cause the program to produce erroneous results.

Accepted Answer

Logical errors, also known as semantic errors, do not cause the program to crash or produce an error message, but instead cause it to produce incorrect or unexpected results.

Question 6

Java source files end with the .class extension.

Accepted Answer

Java source files end with the .java extension, while compiled Java code ends with the .class extension.

Question 7

Application software refers to programs that make the computer useful to the user.

Accepted Answer

Application software is designed to perform specific tasks or applications that make the computer useful to the user.

Question 8

The Java Virtual Machine is a program that reads Java byte code instructions and executes them as they are read.

Accepted Answer

The Java Virtual Machine is responsible for reading and executing the compiled Java byte code instructions.

Question 9

Without programmers, the users of computers would have no software, and without software, computers would not be able to do anything.

Accepted Answer

Programmers are responsible for creating software programs that enable computers to perform various functions and tasks. Without software, computers would be inert machines that are unable to perform any useful work. Therefore, the statement is true.

Question 10

Compiled byte code is also called source code.

Accepted Answer

Compiled byte code is not called source code. Source code is the human-readable code written by programmers, while compiled byte code is the binary representation of the source code that can be executed by the computer.

Question 11

Encapsulation refers to the combining of data and code into a single object.

Accepted Answer

Encapsulation is a fundamental concept of object-oriented programming that involves bundling data and code together into a single unit, typically a class. The purpose of encapsulation is to restrict access to the internal state of an object and only expose the methods or functions that are necessary for interacting with the object. This helps to maintain the integrity and consistency of the object's data and ensures that it can only be modified through approved channels.

Quiz 1: Introduction to Computers and Java