Numerical-Based MCQs

If an array has 10 elements, what is the index of the last element?

• 10

• 9

• 8

• 1

What is the time complexity of reversing an array using two pointers?

• O(n²)

• O(log n)

• O(n)

• O(1)

What is the time complexity of pushing an element into a stack?

• O(n)

• O(1)

• O(log n)

• O(n log n)

If an infix expression has 5 operators, how many operands must it have at minimum to be valid?

• 5

• 4

• 6

• 3

Evaluate the postfix expression 5 3 2 * +.

• 11

• 16

• 17

• 10

How many comparisons does binary search make in worst-case for 64 elements?

• 6

• 7

• 8

• 9

How many rotations are needed to rotate a 6-element array left by 2 using one-by-one method?

• 1

• 2

• 3

• 4

What is the auxiliary space for reversing an array using a stack?

• O(1)

• O(log n)

• O(n)

• O(n²)

Which operator has highest precedence in A + B * C - D / E?

• +

• -

• *

• * and /

Evaluate 7 8 + 3 2 + / in postfix.

• 3

• 5

• 3.75

• 4