Question 1

The And operator always checks both conditions, while the AndAlso operator is not required to check both conditions.

Accepted Answer

The And operator always checks both conditions to evaluate the entire expression, while the AndAlso operator is a short-circuiting operator that only evaluates the second condition if the first condition is true.

Question 2

The ToUpper() and ToLower() methods will temporarily convert a string to uppercase or lowercase respectively.

Accepted Answer

This is correct. The ToUpper() and ToLower() methods will temporarily convert a string to uppercase or lowercase respectively.

Question 3

Comparison operators are always evaluated after arithmetic operators in a conditional expression.

Accepted Answer

In the order of operations, arithmetic operators (such as +, -, *, /) are evaluated before comparison operators (such as ==, !=, <, >), so any arithmetic operations will be performed first, and then the result will be used in the comparison.

Question 4

The selection structure is used when you wish a program to make a decision or comparison in a program.

Accepted Answer

The selection structure is also known as the conditional structure and is used to make decisions in a program based on certain conditions or criteria. It allows the program to execute different statements based on whether a condition is true or false.

Question 5

The value of the following expression 9 * 2 - 8 > 5 + 2 / 2 is true.

Accepted Answer

Evaluating the expression: 9 * 2 - 8 = 18 - 8 = 10 and 5 + 2 / 2 = 5 + 1 = 6. Therefore, 10 > 6 is true.

Question 6

When coding a selection instruction in Visual Basic .NET the code that follows the Else statement are those instructions that will be executed when the condition is true.

Accepted Answer

In Visual Basic .NET, the code that follows the Else statement will be executed when the condition is false, not true. The code that follows the If statement will be executed when the condition is true.

Question 7

A programmer must write the selection structure in such a way as to have either a true or false answer.

Accepted Answer

The purpose of a selection structure is to evaluate a condition and make a decision based on whether that condition is true or false. Therefore, the structure must be written in a way that will result in one of these two outcomes.

Question 8

The Not operator would make a True statement False, but would not make a False statement evaluate True.

Accepted Answer

The Not operator inverts the truth value of a statement, making a True statement False and a False statement True.

Question 9

The oval symbol is used in a flowchart to represent the start and stop point.

Accepted Answer

The oval symbol is indeed used in flowcharts to represent the start and stop points.

Question 10

The conditional expression 3 + 3 < = 12 / 4 + 3 evaluates to false.

Accepted Answer

The expression evaluates to true because 3 + 3 equals 6, and 12 / 4 equals 3, so when you add 3 to that, you get 6, making both sides of the inequality equal, thus satisfying the condition.

Question 11

An Xor logical operator is true if both conditions are true.

Accepted Answer

The Xor operator is true only if one of the conditions is true, but not both.

Question 12

The conditional expression 4 * 6 / 2 > = 3 * 5 + 9 evaluates to false.

Accepted Answer

The expression evaluates to 12 >= 24, which is false.

Question 13

The parallelogram is used in a flowchart for decision activities.

Accepted Answer

In a flowchart, the diamond shape is used for decision activities, not the parallelogram. The parallelogram is typically used to represent input and output operations.

Question 14

The rectangle is used in a flowchart to represent both Input and Output activities.

Accepted Answer

In a flowchart, a parallelogram is used to represent input and output activities, not a rectangle. A rectangle is typically used to represent a process or operation.

Question 15

The conditional expression 9 * 2 / 6 > 12 / 3 / 2 evaluates to true.

Accepted Answer

9 * 2 / 6 = 3
12 / 3 / 2 = 2
Therefore, 3 > 2, which is true.

Question 16

An If selection structure contains two sets of instructions to be executed, one for the true condition and one for the false condition.

Accepted Answer

The answer of An If selection structure contains two sets...

Question 17

The data validation process means that the data that has been validated and is within an acceptable range.

Accepted Answer

The data validation process is designed to ensure that data is accurate, complete, and within an acceptable range or format. Therefore, the statement that "the data that has been validated and is within an acceptable range" is true.

Question 18

When coding a selection instruction in Visual Basic .NET the code that follows the Then statement are those instructions that will be executed when the condition is false.

Accepted Answer

The code that follows the Then statement are those instructions that will be executed when the condition is true. The code that follows the Else statement are those instructions that will be executed when the condition is false.

Question 19

The diamond symbol is used in a flowchart for a calculation task.

Accepted Answer

The diamond symbol in a flowchart represents a decision point, not a calculation task.

Question 20

The Or operator always checks both conditions, while the OrElse operator is not required to check both conditions.

Accepted Answer

The Or operator evaluates both conditions to determine the final result, while the OrElse operator only evaluates the second condition if the first one is false. This can improve performance in certain scenarios where the second condition is expensive to evaluate.

Quiz 4: The Selection Structure