Constants in Exponential Notation

1) Which of these is the correct constant declaration for the gravitational constant which is equal to 1.07 times 10 to the negative 9th power in feet cubed per pound second squared?

Const Gravity = 1.07 * 10 ^ -9 ft^3/lb*sec^2

Const GRAVITY = 1.07E-9

Constant Gravity = -1.07 x 10^9

Const GRAVITY = 1.07 e 9

We use all caps from constant identifiers and exponential notation must be used. No units are included. In exponential notation, the E takes the place of the x 10 of scientific notation.

Explanation

We use all caps from constant identifiers and exponential notation must be used. No units are included. In exponential notation, the E takes the place of the x 10 of scientific notation.

2) What is the keyword used for declaring a constant?

Const

Constant

Const

Starts with a capital C. Const

Explanation

Starts with a capital C. Const

3) Which is the appropriate constant declaration for the weight of the Earth in pounds?

Const WEIGHTEARTH = 1.315E10^25

WeightEarth Const = 1.315 * 10 ^ -25

Const WEIGHTEARTH = 1.315e25

Constant WeightEarth = 1.315E-25

All capitals and exponential notation.

Explanation

All capitals and exponential notation.

4) What line of code will put the cursor on the Clear command button?

CmdClear.SetFocus

MnuClear.SetFocus

Clear.SetFocus

CmdClear.Focus

You look where the cursor is, so the code for putting the cursor somewhere is done with the name of the object followed by .SetFocus

Explanation

You look where the cursor is, so the code for putting the cursor somewhere is done with the name of the object followed by .SetFocus

5) Which is the correct line to use for the beginning of the For Next loop that generates the elevations from 0 to 20000 feet above the Earth's surface for elevations of 1000 feet increments?

For Elevation = 1 To 20000

For Elevation = 0 To 1000

For Acceleration = 1 To 1000 Step 20000

For Elevation = 0 To 20000 Step 1000

The directions call for the elevations to be feet above the Earth's surface from 0 to 20000 feet in 1000 foot increments. Units are not used in the For Next loop. The phrase in 1000 foot increments means that the step is 1000. No commas are used. The variable after For and after Next is Elevation.

Explanation

The directions call for the elevations to be feet above the Earth's surface from 0 to 20000 feet in 1000 foot increments. Units are not used in the For Next loop. The phrase in 1000 foot increments means that the step is 1000. No commas are used. The variable after For and after Next is Elevation.

6) Which is the correct assignment statement for calculating the acceleration?

Acceleration = GRAVITY * WEIGHTEARTH / (RADIUSEARTH + Elevation) ^ 2

A = G * W / R + E ^ 2

Acceleration = Gravity * WeightEarth / RadiusEarth + Elevation ^ 2

Acceleration = (Gravity * WeightEarth / RadiusEarth + Elevation) ^ 2

The correct assignment statement for calculating the acceleration is "Acceleration = GRAVITY * WEIGHTEARTH / (RADIUSEARTH + Elevation) ^ 2." This formula correctly calculates the acceleration by multiplying the gravity (GRAVITY) by the weight of the Earth (WEIGHTEARTH), and then dividing it by the sum of the radius of the Earth (RADIUSEARTH) and the elevation, all raised to the power of 2.

Explanation

The correct assignment statement for calculating the acceleration is "Acceleration = GRAVITY * WEIGHTEARTH / (RADIUSEARTH + Elevation) ^ 2." This formula correctly calculates the acceleration by multiplying the gravity (GRAVITY) by the weight of the Earth (WEIGHTEARTH), and then dividing it by the sum of the radius of the Earth (RADIUSEARTH) and the elevation, all raised to the power of 2.

7) What is the best name for the menu item with the word Gravity?

LblGravity

CmdGravity

MnuGravity

TxtGravity

mnu is the 3-letter prefix for menu items.

Explanation

mnu is the 3-letter prefix for menu items.

8) Which is the correct syntax for the constant definition for the radius of the Earth in feet?

Ft Radius_Earth = 20,882,400

Const RADIUSEARTH = 20882400

Const RadiusEarth = 20,882,400 ft

Constant RADIUSEARTH = 20882400 FEET

Do NOT include units. Do not include commas.

Explanation

Do NOT include units. Do not include commas.

9) Since the elevations are going to be provided by a For Next loop and will be from 0 to 20,000 feet above the Earth's surface in 1000 feet increments, how should the variable Elevation be declared?

Dim Elevation As Single

Dim Elevation As String

Dim Elevation As Integer

Const Elevation = 20000

Only integers are needed because the elevations will be 0, 1000, 2000, 3000, 4000, etc up to 20000.

Explanation

Only integers are needed because the elevations will be 0, 1000, 2000, 3000, 4000, etc up to 20000.

10) Which is the correct declaration for a variable that will hold the various results as they determined in the For Next loop?

Dim ResultString As Integer

Dim ResultString As Single

Const ResultString = 32.2

Dim ResultString As String

Look at the ResultString.frm directions as a guide. ResultString is a concatenation of values and spaces put into a string variable.

Explanation

Look at the ResultString.frm directions as a guide. ResultString is a concatenation of values and spaces put into a string variable.

11) If the result string is made up of a concatenation of values of variables and space and then added to the listbox, which of these lines of code would be appropriate for displaying the output to the listbox?

ResultList.AddItem ResultString

ResultList.Clear ResultString

ResultString.AddItem ResultList

ResultString.AddItem Sum

ResultList is the name of the ListBox where the results are being displayed. .AddItem is used with ListBoxes. The value of the variable ResultString is being added to the ListBox each time through the loop.

Explanation

ResultList is the name of the ListBox where the results are being displayed. .AddItem is used with ListBoxes. The value of the variable ResultString is being added to the ListBox each time through the loop.

12) What line of code tells the computer when to increment the elevation and when to repeat the loop?

Next Loop

Next Elevation

End If

End Loop

Every For has its Next. The variable and For and its corresponding Next, must be the same.

Explanation

Every For has its Next. The variable and For and its corresponding Next, must be the same.

13) What is the standard way to write constants in Visual Basic?

All capital letters

All lowercase letters

First letter capital and the rest lowercase

Capitals for each new word

All caps make constants look different from variables.

Explanation

All caps make constants look different from variables.

14) Since the acceleration is going to be calculated by the program, its variable must also be declared. The sample output shows values such as 32.26627 and 32.22921 as accelerations; therefore, which is the best declaration for the acceleration variable?

Dim Acceleration As Integer

Dim Acceleration As String

Const Acceleration As Single

Dim Acceleration As Single

Single is needed for decimals.

Explanation

Single is needed for decimals.

Constants In Exponential Notation