CSAT (Aptitude)·MCQ Practice
Odd One Out — MCQ Practice
Updated 19 Oct 2026
Interactive MCQ Practice
Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 5 questions available.
Q1medium
Under the stated criterion “perfect square”, which item does not belong: 36, 49, 63, 81?
Q2medium
Which number is not divisible by seven in the list 21, 35, 49, 55?
Q3medium
Under the criterion “prime number”, which entry is the odd one out: 11, 13, 21, 29?
Q4medium
Which pair breaks the rule “the second number is the square of the first”: (3,9), (4,16), (5,20), (6,36)?
Q5medium
Using the criterion “equal alphabetic gaps between successive letters”, which group is the odd one out: ACE, BDF, CEG, DFH?