Deck 17: Fundamental Concepts Expressed in Javascript

Question 1

In programming, names for values are called variables .

Answer 1

True

Question 2

The letter sequence that makes up a variable name is called a label .

Answer 2

False

Question 3

In JavaScript, variables must be declared at the top of the program .

Answer 3

False

Question 4

A JavaScript variable cannot be initialized in the same statement in which it is declared .

Question 5

In JavaScript strings must be enclosed in either single quotes (' . . . ') or double quotes (" . . . ") .

Question 6

The statement terminator in JavaScript is a colon (:) .

Question 7

The flow of an assignment statement is always right to left .

Question 8

Relational operators cannot be used on strings .

Question 9

The outcome of a relational expression is always either true or false .

Question 10

The <then-statement> of an if statement only executes when the predicate is true .

Question 11

When the <Boolean expression> of an if/else statement is false, the <else-statement> of the expression is executed .

Question 12

A correct solution to a programming problem is always an elegant solution .

Question 13

In JavaScript, all variables must be initialized immediately following their declarations .

Question 14

In programming the statement x = x + 1; makes no sense since no value can be the same as itself plus one .

Question 15

Programming languages

A) automate the process of writing a program
B) allow for only one possible solution to a problem
C) are written in English sentences
D) are precise

Question 16

Which of the following is a valid JavaScript variable name?

A) br549
B) Tax Rate
C) 37AB
D) 0123

Question 17

While specifics may vary from language to language, in general an identifier

A) must be made up only of letters
B) starts with two digits followed by an underscore and letters
C) cannot contain numbers, spaces, or special characters
D) starts with a letter and is followed by letters, numbers, or underscores

Question 18

In JavaScript the escape symbol is the

A) colon (:)
B) backslash (\)
C) slash (/)
D) semicolon (;)

Question 19

Which of the following is NOT a valid assignment statement, assuming length, width, and area are valid variables?

A) area = length * width;
B) area = 12345;
C) length * width = area;
D) area = "The area is 12,345 square feet . ";

Question 20

In JavaScript, the statement 17 % 5 results in

A) 3
B) 0 . 175
C) 3 . 4
D) 2

Question 21

In JavaScript an empty string

A) is not valid
B) is written as ""
C) is the same an an undefined value
D) contains a single space enclosed in double quotes

Question 22

In JavaScript a string constant or string literal

A) cannot be a number
B) is surrounded by quotes in the code
C) cannot include a tab character
D) is stored in memory with the surrounding quotes included

Question 23

Which of the following is NOT a JavaScript data type?

A) Booleans
B) numbers
C) strings
D) All of these are JavaScript data types .

Question 24

If the JavaScript variable myAge has the value 5, what will be the result of the following statement?
MyAge == 23;

A) an error will occur since this statement is not true
B) true
C) false
D) myAge will be updated to have the value 23

Question 25

What is the result of the following expression, assuming B = 5 and D = 3?
(B != D) || (B > D)

A) false
B) (5 != 3) is not the same as (5 > 3)
C) true
D)None of these, relational and logical operators cannot be combined in one expression .

Question 26

What is the value of the variable result after the following statements execute?
FirstName = "Martha";
LastName = "Jones";
Result = firstName + lastName;

A) Martha Jones
B) MarthaJones
C) Martha + Jones
D) None of these; you cannot add two strings .

Question 27

What is the value of the variable result after the following statements execute?
Age = 23;
Name = "Howard";
If (age >= 23 && name == "Johnny")
Result = "At last! I found you, "+ name;
Else
Result = "Sorry, "+name+" . You're not my long lost cousin . ";

A) At last! I found you, Howard
B) Sorry, Howard . You're not my long lost cousin .
C) At last! I found you, Johnny
D) Sorry, Johnny . You're not my long lost cousin .

Question 28

What is the value of the variable result after the following statements execute?
Card_1 = 10;
Card_2 = 11;
If (card_1 + card_2 == 21)
Result = "You win! Your score is "+ (card_1 + card_2);
Else
Result = "Sorry, You lose . Score is "+ (card_1 + card_2);

A) You win! Your score is 10 + 11
B) You win! Your score is 21
C) Sorry, You lose . Score is + 10 + 11
D) Sorry, You lose . Score is 21

Question 29

Select all that apply . In JavaScript the + sign represents

A) addition or string concatenation, depending on the values it is used with
B) addition
C) string concatenation
D) None of these

Question 30

Select all that apply . Which of the following are valid variable declarations?

A) myName = "Snoopy";
B) var myName = 23;
C) var x;
D) var 1stName;

Question 31

Select all that apply . Which of the following are examples of JavaScript expressions?

A) var myName = "Joey";
B)a * (b + c) / d
C) length = 14;
D) 3 . 14 * radius * radius

Question 32

Select all that apply . Which of the following are relational expressions?

A) A && B || C && D
B) A < B
C) A * B >= C * D
D) C != C

Question 33

________ is a programming language used for web applications .

Question 34

In programming a(n) ________ is used to change the value of a variable .

Question 35

The JavaScript declaration command used to create a variable is the keyword ________ .

Question 36

The angle brackets (< >) used to describe the syntax of a programming command are called ________ .

Question 37

The single equals sign (=) in JavaScript indicates a(n) ________ of a value to a variable .

Question 38

The double equals operator (==) asks the question, "is this value ________ another value?"

Question 39

The logical AND operator is denoted by ________ .

Question 40

A(n) ________ value is a sequence of keyboard characters surrounded by single or double quotes . .

Question 41

The letter sequence that makes up a variable's name is called the ________ .

Question 42

________ is the act of formulating an algorithm or program .

Question 43

________ are memory locations in the computer .