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What is not a disadvantage of priority scheduling in operating systems?

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MCQ
1.
What is a dequeue?
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MCQ
2.
Which of the following best describes the growth of a linear queue at runtime?

 (Q is the original queue, size() returns the number of elements in the queue)

a)

private void expand()
{
 int length = size();
 int[] newQ = new int[length<<1];
 for(int i=front; i<=rear; i++)
 {
  newQ[i-front] = Q[i%CAPACITY];
 }
 Q = newQ;
 front = 0;
 rear = size()-1;
}

b)

private void expand()
{
 int length = size();
 int[] newQ = new int[length<<1];
 for(int i=front; i<=rear; i++)
 {
  newQ[i-front] = Q[i%CAPACITY];
 }
 Q = newQ;
}

c)

private void expand()
{
 int length = size();
 int[] newQ = new int[length<<1];
 for(int i=front; i<=rear; i++)
 {
  newQ[i-front] = Q[i];
 }
 Q = newQ;
 front = 0;
 rear = size()-1;
}

d)

private void expand()
{
 int length = size();
 int[] newQ = new int[length*2];
 for(int i=front; i<=rear; i++)
 {
  newQ[i-front] = Q[i%CAPACITY];
 }
 Q = newQ;
}
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3.
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4.
Number of "ADD" and "REMOVE" operations required to access n/2th elements of a queue of "n" elements so that the original queue remain the same after the access is (take help of another queue.)
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5.
Which data structure is used in breadth first search of a graph to hold nodes?
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