Deck 6: Javascript: Introduction to Scripting

Question 1

What will the browser display if the following script is executed and the user enters 5 at both prompts
< script type = "text/javascript" >
< !--
Var firstNumber = window.prompt( "Enter an integer", "0" );
Var secondNumber= window.prompt( "Enter an integer", "0" );
Var thirdNumber;
ThirdNumber = firstNumber + secondNumber;
Document.write( thirdNumber );
//-- >
< /script >

A) nothing
B) 0
C) 10
D) 55

Answer 1

D

Question 2

In the following line, the word writeln is a(n) _________ that performs a task or action in the script.
Document.writeln("Hello World");

A) structure
B) collection
C) object
D) method

Answer 2

D

Question 3

Which of the following operators associates from right to left

A) ==
B) =
C) +
D) %

Answer 3

B

Question 4

What does the following expression evaluate to
( ( 3 + ( 5 + 4 ) * 7 ) + 4 ) / 5

A) 8
B) 14
C) 17.6
D) 26.4

Question 5

An alert dialog displaying the text "Welcome!" is created by calling _________.

A) window.alert( "Welcome!" );
B) alert.window( "Welcome!" );
C) window( "alert = \"Welcome!\"" );
D) window( "< alert > Welcome! < /alert >" );

Question 6

Consider the following HTML5 code.
< html >
< script type = "text/javascript" >
< !--
< !-- document.writeln("Hello World"); -- >
//-- >
< /script >
< /html >
What would a browser capable of scripting display when executing this code

A) document.writeln("Hello World");
B) nothing
C) Hello World
D) < html > < script type = "text/javascript" >
< !--
< !-- document.writeln("Hello World < /p >");
//-- >
< /script >
< /html >

Question 7

Which of the following sequences does not follow the rules of operator precedence Assume that operators are evaluated in the order listed from left to right.

A) multiplication, division, addition
B) parentheses, subtraction, modulus
C) division, multiplication, addition
D) parentheses, modulus, subtraction

Question 8

Consider the following script. What is wrong with the following code
< script type = "text/javascript" >
Var firstNumber;
ThirdNumber;
FirstNumber = window.prompt("Enter an integer", "0");
SecondNumber = window.prompt("Enter an integer", "0");
ThirdNumber = firstNumber + secondNumber;
< /script >

A) thirdNumber in line 7 must be in quotes.
B) The words Enter an integer in line 6 should not be in quotes.
C) The word thirdnumber in line 3 should have a comma after it.
D) The word var must be placed before thirdNumber in line 3.

Question 9

What is the result of the statement 17 % 5

A) 0
B) 2
C) 3
D) 12

Question 10

Which of the following is not a valid variable name

A) Tax1
B) eightball_8
C) 12footage
D) pageNumber1200

Question 11

Whenever a value is placed in a memory location, the value________.

A) cannot be added if a value already exists
B) can share a location in memory with another value
C) replaces the previous value in that location
D) will be assigned to another identifier if a value already exists

Question 12

Which of the following is not a valid JavaScript equality or relational operator

A) =
B) <
C) >
C)!=

Question 13

Which of the following statements would correctly print out the sentence "Hello World" in blue

A) document.write( "< p style = \"color: blue\"); document.write( "Hello World >");
B) document.write( "< p > style = \"color: blue\" Hello World < /p >);
C) document.write( "< p style = \"color: blue\" Hello World + "< /p >");
D) document.write( "< p style = \"color: blue\" >"); document.write( "Hello World < /p >");

Question 14

In the following line the word document is a(n) ______ that resides in the computer's memory.
Document.writeln("Hello World");

A) attribute
B) behavior
C) object
D) method