Javascript Basics-1

Javascript is an _______ language?

• Object-Oriented

• Object-Based

• Procedural

• None of the above

Which of the following keywords is used to define a variable in Javascript?

• var

• let

• Both A and B

• None of the above

Which of the following methods is used to access HTML elements using Javascript?

• getElementbyId()

• getElementsByClassName()

• Both A and B

• None of the above

Upon encountering empty statements, what does the Javascript Interpreter do?

• Throws an error

• Ignores the statements

• Gives a warning

• None of the above

Which of the following methods can be used to display data in some form using Javascript?

• document.write()

• console.log()

• window.alert()

• All of the above

Which of the following is the correct output for the following JavaScript code:varx=5,y=1  

1. var obj ={ x:10}  

2. with(obj)  

3. {  

4.       alert(y)  

5. }  

• 1

• Error

• 10

• 5

The "function" and " var" are known as:

• 1. Keywords

• 1. Data types

• 1. Declaration statements

• 1. Prototypes

In the following given syntax of the switch statement, the Expression is compared with the labels using which one of the following operators?

1. switch(expression)  

2. {  

3.     statements  

4. }  

• ===

• equals

• equal

• ==

What will happen, if the following JavaScript code is executed?

1. var count =0;  

2. while (count <10)  

3. {  

4.      console.log(count);  

5.      count++;  

6. }  

• 1. An error is displayed

• 1. An exception is thrown

• 1. The values of count variable are logged or stored in a particular location or storage

• 1. The value of count from 0 to 9 is displayed in the console

Which of the following is the correct output for the following JavaScript code:

1. Int x=8;  

2. if(x>9)  

3. {  

4. document.write(9);  

5. }  

6. else  

7. {  

8. document.write(x);  

9. }  

• 9

• 0

• 8

• Undefined