JavaScript

1. JavaScript is a _______________ language.

• a) Object-Oriented

• b) High-level

• c) Assembly-language

• d) Object-Based

2. What will be the output of the following JavaScript code?

var a=5 , b=1
var obj = { a : 10 }
with(obj) 
{
      alert(b)
}

• a) 10

• b) Error

• 
  c) 1

• d) 5

3. A conditional expression is also called a _______________

• a) Alternative to if-else

• b) Immediate if

• c) If-then-else statement

• d) Switch statement

4. Which is a more efficient JavaScript code snippet?
Code 1 :

for(var num=10;num>=1;num--)
{
           document.writeln(num);
}

Code 2 :

var num=10;
while(num>=1)
{
       document.writeln(num);
       num++;
}

• a) Code 1

• b) Code 2

• c) Both Code 1 and Code 2

• d) Cannot Compare

5. What is a block statement in JavaScript?

• a) conditional block

• b) block that contains a single statement

• c) both conditional block and a single statement

• d) block that combines multiple statements into a single compound statement

6. When an empty statement is encountered, a JavaScript interpreter __________

• a) Ignores the statement
  
  
  

• b) Prompts to complete the statement

• c) Throws an error

• d) Shows a warning

7. The “var” and “function” are __________

• a) Keywords
  
  

• b) Declaration statements
  

• c) Data type

• d) Prototypes

8. In the following switch syntax, the expression is compared with the case labels using which of the following operator(s)?

switch(expression)
{
    statements
}

• a) ==
  
  
  

• b) equals

• c) equal

• d) ===

9. What happens in the following javaScript code snippet?

var count = 0;
while (count < 10) 
{
     console.log(count);
     count++;
}

• a) The values of count are logged or stored in a particular location or storage
  
  
  

• b) The value of count from 0 to 9 is displayed in the console

• c) An error is displayed

• d) An exception is thrown

10. The enumeration order becomes implementation dependent and non-interoperable if ___________

• a) If the object inherits enumerable properties
  
  
  

• b) The object does not have the properties present in the integer array indices

• c) The delete keyword is never used

• d) Object.defineProperty() is not used