Algorithms is a Programming & Data Structures (Senior CI) topic in the RAS/RPSC syllabus. This page gathers exam-style Algorithms multiple-choice questions with correct answers and explanations, so aspirants can test recall and revise frequently examined concepts.
Practice 13 Algorithms multiple-choice questions with detailed answers and explanations. Ideal for RAS/RPSC exam preparation.
Reviewed by: Aspirant Academy Editorial Team
Q1. One term is wrong in the following series. Find that wrong term – 4, 15, 64, 5, 25, 125, 6, 36, 216
Explanation
The intended pattern is groups of n, n squared, and n cubed for 4, 5, and 6. For 4 the middle term should be 4 squared = 16, while 64 is 4 cubed. The given 15 breaks the pattern, so option D is correct.
Q2. The postfix form of the expression (A+B)*(C*D-E)*F/G , is -
Explanation
Option C is correct because postfix places each operator after its operands. Here (A+B) becomes AB+, (C*D−E) becomes CD*E−, then multiplying by F and dividing by G gives AB+CD*E-*F*G/.
Q3. Which one of the following is the process of inserting an element in the stack?
Explanation
In a stack, the operation that places a new item on the top is called push. The verified programming reference for stack operations defines push as adding an item onto the top of the stack, while pop removes the top item. Therefore option C is correct.
Q4. Reverse polish notation for infix expression (A+B)*C-D/E will be -
Explanation
Reverse Polish notation is postfix notation, so every operator is written after its operands. Here, (A+B) becomes AB+, multiplying by C gives AB+C*, D/E becomes DE/, and subtracting the second part gives AB+C*DE/-. Therefore option D is the correct postfix form.
Q5. Rohit multiplies a number by 2 instead of dividing the number by 2. Resultant number is what percentage of the correct value?
Explanation
Option D is correct. If the number is x, the correct value after dividing by 2 is x/2, while Rohit's result is 2x; therefore the result is (2x)/(x/2) × 100 = 400% of the correct value.
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