Java MCQ Number 01058

a) user_pref("javascript.console.open_on_error", true);
b) user_pref("javascript.console.open_error ", true);
c) user_pref("javascript.console.open_error ", false);
d) user_pref(" javascript.console.open_on_error", false);

user_pref("javascript.console.open_on_error", true);

4. Which of the following is possible to be referenced in external JavaScript?
a) cpp
b) cs
c) php
d) all of the mentioned

5. Which of the following attribute takes the source of the PHP file?
a) img
b) src
c) source
d) none of the mentioned

<script type="text/javascript" src="myscript.php"></script>

6. What kind of path can the PHP file be?
a) Absolute
b) Relative
c) Either Absolute or Relative
d) Both Absolute and Relative

7. Which of the following global variables is used to get parameters?
a) $HTTP_GET_VAR[].
b) $HTTP_GET_VARS()
c) $HTTP_GET_VARS
d) $HTTP_GET_VARS[].

8. What is the purpose of the RegExp method test()?
a) Tests for a match in its float parameter
b) Tests for a match in its string parameter
c) Tests for a match in its integer parameter
d) None of the mentioned

9. What is the purpose of the function parameter filetype?
a) File type to be expected
b) File type previously got
c) File type that should not be got
d) None of the mentioned

10. Which of the following is the method used to add an element to the desired location?
a) add.element()
b) element.add()
c) element.appendChild()
d) none of the mentioned

Java MCQ Set 2

1. Firebug is an extension of which browser?
a) Mozilla
b) Chrome
c) IE
d) Opera

2. Firebug can be used to inspect
a) HTML
b) CSS
c) DOM
d) All of the mentioned

3. Why do Web Developers use Firebug?
a) Track cookies
b) Track sessions
c) Both Track cookies and sessions
d) None of the mentioned

4. What are the goals for using Firebug?
a) Performance
b) Adaptability
c) Complexity
d) Reliability

5. Which of the following is not a feature of the User Interface?
a) Skinnable Interface
b) Resizable Side Panel
c) Fixed Side Panel
d) Menu options

6. What is the default value of the property overrideConsole>
a) 1
b) true
c) 0
d) false

7. Which of the following property(s) has a default value as false?
a) disableWhenFirebugActive
b) showIconWhenHidden
c) disableXHRListener
d) Both disableWhenFirebugActive & showIconWhenHidden

8. Which of the following action is possible in Firebug when used as a JavaScript Debugger and Profiler?
a) Pause execution in any line
b) Find Scripts easily
c) Find Scripts easily & also Pause execution in any line
d) None of the mentioned

9. Consider the following code snippet

console.log(p)

If p is not defined, what would be the result or type of error?
a) Zero
b) Null
c) ReferenceError
d) ValueNotFoundError

10. The let keyword can be used
a) in a for or for/in loop, as a substitute for var
b) as a block statement, to define new variables
c) to define variables that are scoped to a single expression
d) all of the mentioned

Java MCQ Set 3

1. What does an History object contain?
a) URL
b) Parameters
c) Attribute values
d) Property

2. The history object is a part of which object?
a) Property
b) Window
c) Location
d) Screen

3. How many methods are there in the History object?
a) 3
b) 4
c) 5
d) 6

4. What is the purpose of the method forward()?
a) Loads any random URL in the history list
b) Loads the previous URL in the history list
c) Loads a specific URL from the history list
d) Loads the next URL in the history list

5. How will you update the URL displayed in the location bar?
a) location
b) location.URL
c) location.hash
d) url

6. How do you add a particular state to the browsing history?
a) pushState()
b) replaceState()
c) state()
d) none of the mentioned

7. What does the pushState() method do?
a) Removes the state
b) Adds new state
c) Replaces the state
d) None of the mentioned

8. Which of the following method is used to replace the current history state instead of adding a new state to the browsing history?
a) replaceState()
b) replace(state)
c) replace()
d) none of the mentioned

9. How many parameters does the replaceState() method take?
a) 2
b) 3
c) 4
d) 5

10. What is the purpose of the event window.onpopstate?
a) When a state object is replaced
b) When a state object is added
c) When a state object is removed
d) None of the mentioned

Java MCQ Set 4

1. Where are memory leaks found?
a) Client side objects
b) Server side objects
c) Both Client side and Server side objects
d) None of the mentioned

2. Which handler is triggered when the content of the document in the window is stable and ready for manipulation?
a) onload
b) manipulate
c) create
d) none of the mentioned

3. What is the central concept of JavaScript memory management?
a) Reliability
b) Reachability
c) Efficiency
d) Transparency

4. When does a memory leak happen?
a) Browser doesn’t release memory from objects unnecessary
b) Browser releases too many memories
c) All of the mentioned
d) None of the mentioned

5. What will happen when the data of the jQuery.cache is read from an element?
a) Unique number is retrieved as elem[jQuery.expando]
b) Data is read from jQuery.cache[id]
c) Unique number is retrieved as elem[jQuery.expando] & Data is read from jQuery.cache[id]
d) None of the mentioned

6. The style property belongs to while of the following object?
a) Element
b) Window
c) Location
d) None of the mentioned

7. Which of the following functions are referenced internally?
a) setTimeout
b) setInterval
c) both setTimeout and setInterval
d) none of the mentioned

8. What is the purpose of destroying the functions and objects?
a) Consume unnecessary CPU cycles
b) Prevent the dropping of reference count to 0
c) Centralize the responsibility to clean up
d) All of the mentioned

9. When does a cycle occur during memory leak?
a) No reference occurs
b) Two objects reference
c) One object gets referenced
d) None of the mentioned

10. Which of the following is a way to retain an object in memory?
a) Console Log
b) Closures
c) Destory objects
d) All of the mentioned

Java MCQ Set 5

1. Consider the following code snippet

function printArray(a) 
{
     var len = a.length, i = 0;
     if (len == 0)
        console.log("Empty Array");
     else 
     {
         do 
         {
             console.log(a[i]);
         } while (++i < len);
     }
}

What does the above code result?
a) Prints the numbers in the array in order
b) Prints the numbers in the array in the reverse order
c) Prints 0 to the length of the array
d) Prints “Empty Array”

2. What are the three important manipulations done in a for loop on a loop variable?
a) Updation, Incrementation, Initialization
b) Initialization,Testing, Updation
c) Testing, Updation, Testing
d) Initialization,Testing, Incrementation

3. Consider the following code snippet

function tail(o) 
{ 
    for (; o.next; o = o.next) ;
    return o;
}

Will the above code snippet work? If not, what will be the error?
a) No, this will throw an exception as only numerics can be used in a for loop
b) No, this will not iterate
c) Yes, this will work
d) No, this will result in a runtime error with the message “Cannot use Linked List”

4. Consider the following code snippet

for(var p in o)
   console.log(o[p]);

The above code is equivalent to which code?

a) for (var i = 0;i < a.length;i++)
     console.log(a[i]);
b) for (int i = 0;i < a.length;i++)
     console.log(a[i]);
c) for (var i = 0;i <= a.length;i++)
     console.log(a[i]);
d) for (var i = 1;i < a.length;i++)
     console.log(a[i]);

5. One of the special feature of an interpreter in reference with the for loop is that
a) Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property
b) The iterations can be infinite when an interpreter is used
c) The body of the loop is executed only once
d) All of the mentioned

6. What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?
a) The property will be stored in a cache
b) The loop will not run
c) That property will not be enumerated
d) All of the mentioned

7. What will be the step of the interpreter in a jump statement when an exception is thrown?
a) The interpreter stops its work
b) The interpreter throws another exception
c) The interpreter jumps to the nearest enclosing exception handler
d) None of the mentioned

8. Consider the following code snippet

while (a != 0)
{
   if (a == 1) 
       continue;
   else 
       a++;
}

What will be the role of the continue keyword in the above code snippet?
a) The continue keyword restarts the loop
b) The continue keyword skips the next iteration
c) The continue keyword skips the rest of the statements in that iteration
d) None of the mentioned

9. Consider the following code snippet

function f(o) 
{
     if (o === undefined) debugger;
}

What could be the task of the statement debugger?
a) It does nothing but a simple breakpoint
b) It debugs the error in that statement and restarts the statement’s execution
c) It is used as a keyword that debugs the entire program at once
d) All of the mentioned

10. Among the keywords below, which one is not a statement?
a) debugger
b) with
c) if
d) use strict

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