Question 1

All numeric variables are automatically initialized to 0 if no initial value is specified when the variable is declared.

Accepted Answer

This statement is true. When a numeric variable is declared without an initial value, it will be automatically set to 0.

Question 2

A Boolean variable is initialized to the value True if no initial value is stated when the variable is declared.

Accepted Answer

By default, a Boolean variable is not automatically initialized to True if no initial value is stated; its default initialization value depends on the programming language being used.

Question 3

Spaces are allowed in variable names.

Accepted Answer

Variable names cannot contain spaces; they must be a continuous string of characters, which can include letters, digits, and underscores.

Question 4

Instead of storing data in the properties of various controls,programmers can create ____,which are memory locations inside the computer,to store data.
A)characters
B)variables
C)integers
D)strings

Accepted Answer

Variables are used to store data in memory locations inside a computer. This allows programmers to access and manipulate the data more efficiently, and reduces the amount of duplicate data stored in a program. Characters, integers, and strings are all types of data that can be stored in variables.

Question 5

Object and String variables are automatically initialized using ____.
A)spaces
B)the keyword Nothing (no data at all)
C)the word "Nothing"
D)0

Accepted Answer

In Java, Object and String variables are initialized with a default value of "null", which is equivalent to the keyword "Nothing" in the given options. Therefore, the correct option is B.

Question 6

Every numeric data type in Visual Basic has a ____ method that can be used to convert a string to that numeric data type.
A)Convert
B)Format
C)TryParse
D)Number

Accepted Answer

The TryParse method is the best choice because it attempts to convert the string to the specified numeric data type and returns a Boolean value indicating whether the conversion was successful or not. This allows for proper error handling and avoids exceptions being thrown if the conversion fails. The other options mentioned (Convert, Format, and Number) are valid methods for working with numeric data in Visual Basic, but they don't specifically handle string-to-numeric conversions with the same level of built-in error checking.

Question 7

You can eliminate the problems that occur as a result of implicit type conversions by entering the Option Explicit On statement in the General Declarations section of the Code Editor window.

Accepted Answer

The "Option Explicit On" statement requires all variables to be declared before use, but it does not prevent implicit type conversions. To prevent implicit type conversions, you would use "Option Strict On".

Question 8

Data types and classes are not related to each other.

Accepted Answer

Data types refer to the specific category of values a variable can hold such as integers, strings, or floats, while classes refer to user-defined blueprints for creating objects that can have attributes and methods. These two concepts are related in that classes can have attributes with specific data types, but they are not inherently the same thing.

Question 9

Which of the following statements declares a Double variable named dblAverage?
A)Dim dblAverage As Double
B)Dim As Double dblAverage
C)Const dblAverage As Constant
D)Dim dblAverage As Single

Accepted Answer

This statement declares a Double variable named dblAverage by using the keyword "Dim" followed by the variable name "dblAverage" and the data type "As Double".

Question 10

Calculations involving Decimal variables are not subject to the small rounding errors that may occur when using Double or Single variables.

Accepted Answer

Decimal variables in programming are designed to handle decimal numbers with a high degree of precision, avoiding the rounding errors that can occur with floating-point representations like Double or Single.

Question 11

The assignment operator in Visual Basic is the ____ symbol.
A)^
B)<
C)>
D)=

Accepted Answer

The assignment operator in Visual Basic is the = symbol.

Question 12

A named constant's value cannot be changed while the application is running.

Accepted Answer

A named constant, as the name suggests, has a constant value that cannot be changed during the execution of the program. This is in contrast to variables, whose values can be modified throughout the program's runtime.

Question 13

A variable declared in the Declaration section of a form is called a procedure-level variable.

Accepted Answer

A variable declared in the Declaration section of a form is called a form-level variable or a global variable, accessible to all procedures within that form.

Question 14

You cannot associate a procedure with more than one object or event.

Accepted Answer

It is possible to associate a procedure with multiple objects or events by calling the same procedure when any of those objects or events are triggered.

Question 15

A memory variable that is a Double data type requires ____ bytes of storage.
A)2
B)4
C)6
D)8

Accepted Answer

A Double data type in Java requires 8 bytes of storage. Therefore, option D is the correct choice. The other options are incorrect, as they do not match the storage requirements of a Double data type.

Question 16

Which of the following statements subtracts the contents of the intNum1 variable from the contents of the intNum2 variable,and then multiples the difference by 3? The result is assigned to the intResult variable.
A)intNum1 - intNum2 * 3 = intResult
B)(intNum2 - intNum1) * 3 = intResult
C)intResult = (intNum1 - intNum2) * 3
D)intResult = (intNum2 - intNum1) * 3

Accepted Answer

In order to subtract intNum1 from intNum2, we need to have intNum2 - intNum1. Then, to multiply the result by 3, we need to put the entire expression inside parentheses and multiply by 3. Therefore, the correct statement is intResult = (intNum2 - intNum1) * 3.

Question 17

A variable name must begin with a letter or a(n)____.
A)ampersand (&)
B)percent sign (%)
C)exclamation mark (!)
D)underscore (_)

Accepted Answer

Variable names must begin with a letter or an underscore. The other symbols listed are not valid for use as the first character in a variable name.

Question 18

Which of the following can store a number containing a decimal place?
A)Single
B)Long
C)String
D)Integer

Accepted Answer

Only the data type "Single" can store numbers containing a decimal place. "Long" and "Integer" can only store whole numbers, while "String" can store text and numbers but treats them as text rather than numeric values.

Question 19

The value returned by the InputBox function depends on the button the user chooses.

Accepted Answer

The value returned by InputBox function depends on the button the user chooses. If the user clicks the OK button, the function returns the input value as a string. If the user clicks the Cancel button, the function returns an empty string.

Question 20

Date variables are automatically set to which value when created?
A)1/1/1980 12:00:00 AM
B)1/1/2000 12:00:00 AM
C)1/1/0001 12:00:00 AM
D)1/1/0000 12:00:00 AM

Accepted Answer

In most programming languages, dates are stored as the number of seconds/milliseconds since the Unix epoch - which is January 1, 1970, 00:00:00 UTC. So, the date variables are usually set to the initial date supported by the language, which is January 1, 0001, 00:00:00 UTC.

Quiz 3: Using Variables and Constants

All numeric variables are automatically initialized to 0 if no initial value is specified when the variable is declared.

A Boolean variable is initialized to the value True if no initial value is stated when the variable is declared.

Spaces are allowed in variable names.

Instead of storing data in the properties of various controls,programmers can create ____,which are memory locations inside the computer,to store data.

Object and String variables are automatically initialized using ____.

Every numeric data type in Visual Basic has a ____ method that can be used to convert a string to that numeric data type.

You can eliminate the problems that occur as a result of implicit type conversions by entering the Option Explicit On statement in the General Declarations section of the Code Editor window.

Data types and classes are not related to each other.

Which of the following statements declares a Double variable named dblAverage?

Calculations involving Decimal variables are not subject to the small rounding errors that may occur when using Double or Single variables.

The assignment operator in Visual Basic is the ____ symbol.

A named constant's value cannot be changed while the application is running.

A variable declared in the Declaration section of a form is called a procedure-level variable.

You cannot associate a procedure with more than one object or event.

A memory variable that is a Double data type requires ____ bytes of storage.

Which of the following statements subtracts the contents of the intNum1 variable from the contents of the intNum2 variable,and then multiples the difference by 3? The result is assigned to the intResult variable.

A variable name must begin with a letter or a(n) ____.

Which of the following can store a number containing a decimal place?

The value returned by the InputBox function depends on the button the user chooses.

Date variables are automatically set to which value when created?