Data Structure MCQ – Stack Operations: 3
If the elements “A”, “B”, “C” and “D” are placed in a stack and are deleted one at a time, what is the order of removal?
a) ABCD
b) DCBA
c) DCAB
d) ABDC
Answer: b
1. The result of evaluating the postfix expression 5, 4, 6, +, *, 4, 9, 3, /, +, * is?
a) 600
b) 350
c) 650
d) 588
Answer: b
2. Convert the following infix expressions into its equivalent postfix expressions.
(A + B ⋀D)/(E – F)+G
a) (A B D ⋀ + E F – / G +)
b) (A B D +⋀ E F – / G +)
c) (A B D ⋀ + E F/- G +)
d) (A B D E F + ⋀ / – G +)
Answer: a
3. Convert the following Infix expression to Postfix form using a stack.
x + y * z + (p * q + r) * s, Follow usual precedence rule and assume that the expression is legal.
a) xyz*+pq*r+s*+
b) xyz*+pq*r+s+*
c) xyz+*pq*r+s*+
d) xyzp+**qr+s*+
Answer: a
4. Which of the following statement(s) about stack data structure is/are NOT correct?
a) Linked List are used for implementing Stacks
b) Top of the Stack always contain the new node
c) Stack is the FIFO data structure
d) Null link is present in the last node at the bottom of the stack
Answer: c
5. Consider the following operation performed on a stack of size 5.
Push(1);
Pop();
Push(2);
Push(3);
Pop();
Push(4);
Pop();
Pop();
Push(5);
After the completion of all operation, the number of elements present in stack is?
a) 1
b) 2
c) 3
d) 4
Answer: a
6. Which of the following is not an inherent application of stack?
a) Reversing a string
b) Evaluation of postfix expression
c) Implementation of recursion
d) Job scheduling
Answer: d
7. The type of expression in which operator succeeds its operands is?
a) Infix Expression
b) Prefix Expression
c) Postfix Expression
d) Both Prefix and Postfix Expressions
Answer: c
8. Assume that the operators +,-, x are left associative and ^ is right associative. The order of precedence (from highest to lowest) is ^, x, +, -. The postfix expression for the infix expression a + b x c – d ^ e ^ f is?
a) a b c x + d e f ^ ^ –
b) a b c x + d e ^ f ^ –
c) a b + c x d – e ^ f ^
d) – + a x b c ^ ^ d e f
Answer: a
9. If the elements “A”, “B”, “C” and “D” are placed in a stack and are deleted one at a time, what is the order of removal?
a) ABCD
b) DCBA
c) DCAB
d) ABDC
Answer: b