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JavaScript-Language Basics
Interview Questions and Answer
1. 1) What is the output for following code? var v1=10; var v2=”20”; document.write (v1+v2);
Options:
a. 10
b. 1020
c. 30
Reveal Answer
2. 2)What is document.write () method?
Options:
a. Writes the specified data to document
b. Writes the text representation of specified
c. Writes HTML expression to document
d. All the above
Reveal Answer
3. 3) If a variable is declared in local context, where it is accessible?
Options:
a. Accessible to all the functions
b. Accessible to particular method
c. Both a and b
d. None of the above
Reveal Answer
4. 4) What is the output for following code? var v2=10; Function Foo() { var v1=10; } <script> document.write (v1); document.write (v2); </script>
Options:
a. 1010
b. 10
c. undefined v1
d. undefined v2
Reveal Answer
5. 5) In JavaScript variable can be redeclared two times?
Options:
a. No
b. Yes
Reveal Answer
6. 6) What is the output for following code? var v1=10; Function Foo() { v1++; } <script> var v1=1; Foo(); document.write (v1); </script>
Options:
a. 10
b. 2
c. 11
d. Compile error
Reveal Answer
7. 7) Which is the correct subtype of following types?
Options:
a. string
b. int
c. number
d. function
e. char
Reveal Answer
8. 8)What is the use of typeof() operator
Options:
a. Is used when you have name of the class
b. Is used anywhere a typedef name could be used
c. Is used to get the data type of its operand
d. None of the above
Reveal Answer
9. 8)What is the use of typeof() operator
Options:
a. Is used when you have name of the class
b. Is used anywhere a typedef name could be used
c. Is used to get the data type of its operand
d. None of the above
Reveal Answer
10. 9)What is the output for following code? var v1=10; var v2=”20”; document.write (typeof(v1)); document.write (typeof(v2));
Options:
a. number string
b. object string
c. boolean number
d. number undefined
Reveal Answer
11. 10) What is the use of “use strict”?
Options:
a. Compiler to change its behaviour
b. Code should be executed in strict mode
c. Both a and b
Reveal Answer
12. 11) What is the output for following code? “use strict”; v1=10; var v2=20; document.write (v1);
Options:
a. 10;
b. Variable undefined
c. No error
Reveal Answer
13. 13) What is the use of strict equality comparison (===)?
Options:
a. Compares two values
b. Assign value to variable
c. Compares value and datatype
d. None of the above
Reveal Answer
14. 14) In JavaScript the array is dynamically grow in size
Options:
a. Yes
b. No
Reveal Answer
15. 15) What is the output for following code? var ar=new Array(10); ar[0]=1; ar[1]=2; ar [2]=3; ar [10]=13; document.write (ar.length);
Options:
a. 10
b. 11
c. 13
d. Compile Error
Reveal Answer
16. 16)In JavaScript, arrays use __________indexes
Options:
a. Named indexes
b. Filtered indexes
c. Numbered indexes
d. Clustered indexes
Reveal Answer
17. 17) What is the return type of pop () method?
Options:
a. object
b. string
c. value
d. None of the above
Reveal Answer
18. 18)What does shift () method do?
Options:
a. Removes middle array element and shifts other elements to lower index
b. Removes last array element and shifts other elements to higher index
c. Removes middle array element and shifts other elements to higher index
d. Removes first array element and shifts other elements to lower index
Reveal Answer
19. 19) In JavaScript, how many ‘catch’ and ‘finally’ block for one ‘try’ block
Options:
a. Multiple catch, one finally
b. One catch, multiple finally
c. One catch, one finally
d. Multiple catch, multiple finally
Reveal Answer
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