SSC CHSL (Combined Higher Secondary Level) General Intelligence and Reasoning Flashcards

24 sample cards from the General Intelligence and Reasoning deck

Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.

1. Find the next term: $1, 4, 9, 16, 25, ?$

   $36$. The series is consecutive perfect squares $n^{2}$, so the next is $6^{2}=36$.

2. Find the next term: $3, 6, 12, 24, ?$

   $48$. Each term is multiplied by $2$, so $24\times 2 = 48$.

3. Find the missing term: $1, 1, 2, 3, 5, 8, ?$

   $13$. It is the Fibonacci series; each term equals the sum of the two preceding terms ($5+8=13$).

4. What is an alphabet series?

   An alphabet series is a sequence of letters following a fixed rule, usually a constant or varying gap (skip) in alphabetical positions.

5. Find the next letter: A, C, E, G, ?

   I. The pattern skips one letter each time (gap of $+2$ positions): $A,C,E,G,I$.

6. Find the next letter: A, B, D, G, K, ?

   P. The gaps increase as $+1,+2,+3,+4,+5$, so $K(11)+5 = 16 = P$.

7. What is an alphanumeric series?

   An alphanumeric series mixes letters, numbers, and sometimes symbols, requiring you to track separate patterns for the letters and the numbers.

8. Find the next term: $A1, C3, E5, G7, ?$

   $I9$. Letters skip one each time ($A,C,E,G,I$) and numbers increase by $2$ ($1,3,5,7,9$).

9. What does a 'missing term' series question ask?

   It asks you to identify the rule of the sequence and supply the term that has been left blank within or at the end of the series.

10. What does a 'wrong term' series question ask, and how do you solve it?

    It asks which single term breaks the otherwise consistent pattern; you find the rule from the correct terms and identify the one value that does not fit.

11. Find the wrong term: $2, 4, 8, 16, 30, 64$.

    $30$. The series doubles each time ($\times 2$), so the term after $16$ should be $32$, not $30$.

12. What is coding-decoding in reasoning?

    Coding-decoding is the process of encrypting a word/message using a defined rule (the code) and then applying that same rule to decode or encode a new word.

13. What is letter-shifting coding?

    Letter-shifting coding replaces each letter by another a fixed number of positions forward or backward in the alphabet (e.g., +1, +2, or reverse).

14. In a +1 letter-shift code, how is 'CAT' written?

    DBU. Each letter moves one position forward: $C\to D$, $A\to B$, $T\to U$.

15. What is opposite (reverse) letter coding, and what is the complement of any letter's position?

    Each letter is replaced by its opposite from the other end of the alphabet; the opposite of a letter at position $n$ is at position $27-n$ (e.g., $A\leftrightarrow Z$, $B\leftrightarrow Y$).

16. Using opposite-letter coding ($27-n$), what is the code for 'DOG'?

    WLT. $D(4)\to W(23)$, $O(15)\to L(12)$, $G(7)\to T(20)$, since each uses $27-n$.

17. What is number-based coding?

    Number-based coding assigns numbers to letters or words according to a rule (such as alphabetical position, position plus a constant, or a derived value) for encoding/decoding.

18. If letters are coded by their alphabetical positions, what is the code for 'BAD'?

    $2,1,4$. Using $A=1$, $B=2$, $D=4$, so 'BAD' is coded as $2\text{-}1\text{-}4$.

19. What is substitution coding?

    Substitution coding replaces real words with other given words (e.g., 'sky' is called 'blue'); you answer a question by using the substituted term instead of the actual one.

20. In substitution coding, if 'water' is called 'air' and 'air' is called 'sky', in which do fish live (as named in this code)?

    Air. Fish live in water, but water is called 'air', so the coded answer is 'air'.

21. What is conditional coding (matrix/letter-number coding)?

    Conditional coding gives digits/letters with a set of conditions (rules) that modify how certain elements are coded based on their position or neighbours (e.g., first or last element conditions).

22. In coding-decoding, why is comparing two given coded words often the fastest method?

    Comparing two or more code-word pairs lets you find common letters mapped to common code symbols, revealing the substitution for individual letters even without an explicit shift rule.

23. In letter-shift coding, how do you handle a shift that goes past Z?

    You wrap around to the start of the alphabet (treat it as cyclic mod 26), so after $Z$ the next letter is $A$ (e.g., $Z$ with $+1$ becomes $A$).

24. Decode 'URZ' if it was made by a +3 forward letter-shift on the original word.

    ROW. Reverse the shift by moving each letter 3 positions back: $U\to R$, $R\to O$, $Z\to W$.

What this deck covers

General Intelligence and Reasoning flashcards FAQ