Interview Questions

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

Interview Questions and Answer

1. 1) What is the output for following code? var v1=10; var v2=”20”; document.write (v1+v2);

2. 2)What is document.write () method?

3. 3) If a variable is declared in local context, where it is accessible?

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>

5. 5) In JavaScript variable can be redeclared two times?

6. 6) What is the output for following code? var v1=10; Function Foo() { v1++; } <script> var v1=1; Foo(); document.write (v1); </script>

7. 7) Which is the correct subtype of following types?

8. 8)What is the use of typeof() operator

9. 8)What is the use of typeof() operator

10. 9)What is the output for following code? var v1=10; var v2=”20”; document.write (typeof(v1)); document.write (typeof(v2));

11. 10) What is the use of “use strict”?

12. 11) What is the output for following code? “use strict”; v1=10; var v2=20; document.write (v1);

13. 13) What is the use of strict equality comparison (===)?

14. 14) In JavaScript the array is dynamically grow in size

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);

16. 16)In JavaScript, arrays use __________indexes

17. 17) What is the return type of pop () method?

18. 18)What does shift () method do?

19. 19) In JavaScript, how many ‘catch’ and ‘finally’ block for one ‘try’ block

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