Question 1

Consider the expression 3 * 2 ^ 2 15 - 3. Which operation is performed second?

Accepted Answer

The order of operations dictates that exponentiation is performed first, so 2^2=4. Then, multiplication and division are performed from left to right, so 3*4=12. Finally, addition and subtraction are performed from left to right, so 12-3=9. Therefore, the only operation performed second is multiplication (choice C).

Question 2

The following condition 2 * 3 + 1 > 1 * 2 + 3 OR 7 + 2 < 4 + 1 is false.

Accepted Answer

2 * 3 + 1 > 1 * 2 + 3 evaluates to 7 > 5, which is true. 7 + 2 < 4 + 1 evaluates to 9 < 5, which is false. So the entire condition combined with OR is false as one of the statements is false.

Question 3

The following expression 6 * 5 / 10 > 4 * 8 - 35 XOR 3 * 9 - 30 > 2 * 5 - 15 is true.

Accepted Answer

Evaluating both sides: Left side: 6 * 5 / 10 = 30 / 10 = 3, which is not greater than 4 * 8 - 35 = 32 - 35 = -3. Right side: 3 * 9 - 30 = 27 - 30 = -3, which is not greater than 2 * 5 - 15 = 10 - 15 = -5. Since both comparisons are false, the XOR (exclusive or) of two false statements is also false.

Question 4

What is the value of the following expression: 9 * 2 - 8 > 5 + 2 / 2?

Accepted Answer

The expression evaluates as follows: 9 * 2 - 8 > 5 + 2 / 2 simplifies to 18 - 8 > 5 + 1, which further simplifies to 10 > 6. This statement is true, so the correct answer is True.

Question 5

Consider the expression 3 * 2 ^ 2 15 - 3. Which operation is performed last?

Accepted Answer

The answer of Consider the expression 3 * 2 ^...

Question 6

Which of the following standard flowchart symbols is used for calculations?

Accepted Answer

The rectangle is the standard flowchart symbol used for process steps, which include calculations.

Question 7

Consider the expression 3 * 2 ^ 2 15 - 3. Which operation is performed first?

Accepted Answer

According to the order of operations (PEMDAS/BODMAS), exponentiation (^) is performed before multiplication (*), division (/), and addition (+).

Question 8

You can use the Catch statement to catch (or trap) an exception when it occurs in a program.

Accepted Answer

The answer of You can use the Catch statement to...

Question 9

The method that will cause a message box to display on the screen is the ____ method.

Accepted Answer

The Show method is used to display a message box on the screen. The other options are not correct: Display may refer to various display-related functions, Visible is a property that indicates whether a control is currently visible on the screen or not, and Prompt is not a valid method in this context.

Question 10

The following expression 6 * 5 / 10 > 4 * 8 - 35 AND 3 * 9 - 30 > 2 * 5 - 15 is true.

Accepted Answer

First, we need to evaluate 6 * 5 / 10 and 4 * 8 - 35 separately.

6 * 5 / 10 = 3

4 * 8 - 35 = 1

So the first part of the expression becomes:

3 > 1

And this is true.

Next, let's evaluate 3 * 9 - 30 and 2 * 5 - 15:

3 * 9 - 30 = 3

2 * 5 - 15 = -5

So the second part of the expression becomes:

3 > -5

And this is also true.

Therefore, both parts of the expression are true, and the entire expression is true, making the answer A.

Question 11

To make a decision in the logic of a program you would use which of the following programming structures?

Accepted Answer

Selection structures allow for conditional statements to be made, which are necessary for decision making in a program.

Question 12

Which of the following operators is evaluated last in the following expression: 9 * 2 - 8 > 5 + 2 / 2?

Accepted Answer

The order of operations (PEMDAS) dictates that multiplication and division should be done before addition and subtraction. However, in this expression, there are no parentheses or exponents to consider, so we move left to right. Therefore, first we evaluate 9 * 2, which equals 18. Then we evaluate 2 / 2, which equals 1. Next, we add 5 and 1, which equals 6. Finally, we subtract 8 from 18, which equals 10. The last step is to compare 10 to 6 using the > operator, which evaluates to true. Therefore, the operator that is evaluated last is the > operator.

Question 13

Which of the following operators is evaluated first in the following expression: 9 * 2 - 8 > 5 + 2 / 2?

Accepted Answer

The multiplication operator (*) is evaluated first according to the order of operations (parentheses, exponents, multiplication/division, addition/subtraction) so 9 * 2 is calculated first, resulting in 18. Then the subtraction operator (-) is evaluated, resulting in 10. Next, the addition operator (+) is evaluated, resulting in 6. After that, the division operator (/) is evaluated, resulting in 1. Finally, the greater than operator (>) is evaluated, resulting in the boolean value true.

Question 14

If a letter grade of "B" or "A" on a test is determined based upon the following grading scale, which expression would identify an individual earning a "B" or "A" based upon a variable score? 90-100 A 80- B 70- C 60- D 0- F

Accepted Answer

C) score >= 80 correctly identifies individuals earning a "B" (80-89) or "A" (90-100) because it includes all scores from 80 and above.

Question 15

If a letter grade of "B" on a test is determined based upon the following grading scale, which of the following expressions would identify an individual earning a "B" based upon a variable score? 90-100 A 80- B 70- C 60- D 0- F

Accepted Answer

The grading scale shows that a "B" is earned with a score in the range of 80-89. Therefore, the expression that correctly identifies an individual earning a "B" would be one that includes scores that are greater than or equal to 80, but less than 90. Choice C, "score >= 80 and score < 90", fits this criteria and is therefore the best choice.

Question 16

Which of the following standard flowchart symbols is used to mark the beginning and end of a flowchart?

Accepted Answer

An oval symbol is used to mark the beginning and end of a flowchart.

Question 17

Which of the following standard flowchart symbols is used to represent both selection and repetition?

Accepted Answer

The diamond symbol represents both selection (decision-making) and repetition (looping) in a flowchart. It is used to indicate branching or choosing between two or more paths, as well as repeating a set of actions until a certain condition is met. The oval symbol represents the start and end points of a process, the rectangle symbol represents a process or task, and the parallelogram symbol represents input/output.

Question 18

The conditional expression 28 / 4 + 2 < ( 13 - 7) / 6 evaluates to false.

Accepted Answer

The left side evaluates to 9 (28/4 + 2), and the right side evaluates to 1 ((13-7)/6). Since 9 is not less than 1, the expression is false.

Question 19

Which of the following is used to express inequality?

Accepted Answer

The symbol <> (not equal to) is specifically used to express inequality. The other options are symbols for greater than, greater than or equal to, and less than or equal to.

Question 20

Which of the following standard flowchart symbols is used for input/output activities?

Accepted Answer

The parallelogram symbol is used for input/output activities in a standard flowchart. This symbol represents the point where data enters or leaves the system, such as user inputs or system outputs. The other symbols listed have different meanings in a flowchart: the oval represents the start or end of a process, the rectangle represents a process, and the diamond represents a decision point.

Quiz 4: The Selection Structure