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This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Consider the following code snippet. What does the last statement return ? |
| A. | 9 |
| B. | 0 |
| C. | 10 |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 2. |
Consider the following code snippet. What is the function of the code snippet? |
| A. | Returns value null |
| B. | Returns exception |
| C. | Returns the value in scope |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
Consider the following code snippet. What will the code snippet result ? |
| A. | Prints the contents of each property of o |
| B. | Returns undefined |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 4. |
Consider the following code snippet. What does the below code result? |
| A. | Sum of square of a and b |
| B. | Square of sum of a and b |
| C. | Sum of a and b square |
| D. | None of the mentioned |
| Answer» B. Square of sum of a and b | |
| 5. |
Consider the following code snippet. The state stored in d is : |
| A. | 1 |
| B. | 0 |
| C. | Null |
| D. | Undefined |
| Answer» B. 0 | |
| 6. |
Consider the following code snippet :var grand_Total=eval("10*10+5");The output for the above statement would be : |
| A. | 10*10+5 |
| B. | 105 as a string |
| C. | 105 as an integer value |
| D. | Exception is thrown |
| Answer» D. Exception is thrown | |
| 7. |
Consider the following code snippet :var string2Num=parseInt("123xyz");The result for the above code snippet would be : |
| A. | 123 |
| B. | 123xyz |
| C. | Exception |
| D. | |
| Answer» C. Exception | |
| 8. |
For the below mentioned code snippet:var o = new Object();The equivalent statement is: |
| A. | var o = Object(); |
| B. | var o; |
| C. | var o= new Object; |
| D. | Object o=new Object(); |
| Answer» D. Object o=new Object(); | |
| 9. |
Consider the following code snippet :var tensquared = (function(x) {return x*x;}(10));Will the above code work ? |
| A. | Yes, perfectly |
| B. | Error |
| C. | Exception will be thrown |
| D. | Memory leak |
| Answer» B. Error | |
| 10. |
Consider the following code snippet :if (!a[i]) continue ;What is the observation made ? |
| A. | Skips the undefined elements |
| B. | Skips the non existent elements |
| C. | Skips the null elements |
| D. | All of the mentioned |
| Answer» E. | |
| 11. |
Consider the following code snippet. The final output for the shift() is |
| A. | 1 |
| B. | [4,5] |
| C. | [3,4,5] |
| D. | Exception is thrown |
| Answer» B. [4,5] | |
| 12. |
Consider the following code snippet. The result would be |
| A. | true false |
| B. | false true |
| C. | true true |
| D. | false true |
| Answer» B. false true | |
| 13. |
Consider the code snippet given below:var count = [1,,3];What is the observation made? |
| A. | The omitted value takes "undefined" |
| B. | This results in an error |
| C. | This results in an exception |
| D. | None of the mentioned |
| Answer» B. This results in an error | |