SSC CGL Coding and Series Practice Test 27
15 original SSC CGL level questions on number series, letter series, coding-decoding, and coded operations.
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SSC CGL Coding and Series Practice Test 27
15 original SSC CGL level questions on number series, letter series, coding-decoding, and coded operations.
Preview all 15 questions in SSC CGL Coding and Series Practice Test 27 (no login required)
- Number Series
1. Find the missing number: 4, 9, 19, 39, 79, ?
- A. 149
- B. 159 (Correct)
- C. 169
- D. 179
Explanation: Each term is obtained by multiplying the previous term by 2 and adding 1: 4 x 2 + 1 = 9, so 79 x 2 + 1 = 159.
- Number Series
2. Find the next number: 3, 10, 29, 66, 127, ?
- A. 198
- B. 208
- C. 218 (Correct)
- D. 228
Explanation: Differences are 7, 19, 37 and 61. Their differences are 12, 18 and 24, so next difference is 30 and next main difference is 91. Hence 127 + 91 = 218.
- Letter Series
3. Find the next term: B, E, J, Q, ?
- A. X
- B. Y
- C. Z (Correct)
- D. W
Explanation: Letter positions are 2, 5, 10 and 17. Differences are 3, 5 and 7, so next difference is 9. 17 + 9 = 26, which is Z.
- Letter Series
4. Find the missing term: AZ, CX, EV, GT, ?
- A. IR (Correct)
- B. HS
- C. JQ
- D. KR
Explanation: First letters move A, C, E, G, I by +2. Second letters move Z, X, V, T, R by -2.
- Coding
5. If MANGO is coded as NCQKT, then LEMON is coded as:
- A. MGPSS (Correct)
- B. MGPRT
- C. NGPRT
- D. MFQRT
Explanation: Letters are shifted by +1, +2, +3, +4 and +5 respectively. LEMON becomes M, G, P, S, S.
- Coding
6. If DUST is coded as FWUV, then RAIN is coded as:
- A. TCKP (Correct)
- B. SCKP
- C. TCLP
- D. UBKP
Explanation: Each letter is shifted two places ahead: R->T, A->C, I->K, N->P.
- Coding
7. In a certain code, TABLE is written as GZYOV. How is CHAIR written in the same code?
- A. XSZRI (Correct)
- B. XSRZI
- C. WUZRI
- D. XSZIR
Explanation: The code uses opposite letters: T->G, A->Z, B->Y, L->O, E->V. Therefore C->X, H->S, A->Z, I->R, R->I.
- Alphanumeric Series
8. Find the next term: A1, C4, F9, J16, ?
- A. O25 (Correct)
- B. N25
- C. O24
- D. P25
Explanation: Letters move by +2, +3, +4, then +5. Numbers are squares 1, 4, 9, 16, 25.
- Number Coding
9. If BOX is coded as 43048, then CUP is coded as:
- A. 63932
- B. 64232 (Correct)
- C. 63332
- D. 64130
Explanation: Each letter is coded as twice its alphabetical position: B=4, O=30, X=48. Hence C=6, U=42 and P=32.
- Coded Operations
10. If + means x, - means +, x means / and / means -, then 18 x 3 + 4 - 7 equals:
- A. 24
- B. 28
- C. 31 (Correct)
- D. 35
Explanation: Replace the signs: 18 / 3 x 4 + 7. Using BODMAS, 18 / 3 = 6, 6 x 4 = 24, and 24 + 7 = 31.
- Coded Operations
11. If A # B means A + 2B and A @ B means 3A - B, then (6 # 4) @ 5 equals:
- A. 35
- B. 37 (Correct)
- C. 39
- D. 41
Explanation: 6 # 4 = 6 + 8 = 14. Then 14 @ 5 = 3 x 14 - 5 = 37.
- Number Series
12. Find the next number: 2, 6, 12, 20, 30, ?
- A. 40
- B. 42 (Correct)
- C. 44
- D. 46
Explanation: The differences are 4, 6, 8 and 10, so the next difference is 12. Hence 30 + 12 = 42.
- Letter Coding
13. If the letters of the word MARKET are arranged in reverse order and each consonant is replaced by the next letter, what will be the first letter of the new code?
- A. U (Correct)
- B. T
- C. S
- D. R
Explanation: MARKET reversed is TEKRAM. The first letter T is a consonant, so it becomes U.
- Mixed Series
14. Find the next term: C3, F8, J15, O24, ?
- A. U35 (Correct)
- B. T34
- C. U34
- D. V35
Explanation: Letter gaps are +3, +4, +5, then +6, so O becomes U. Number differences are 5, 7, 9, then 11, so 24 becomes 35.
- Coding
15. In a code language, 'red tall lamp' is written as 'ka mi zo' and 'blue tall wall' is written as 'zo pa re'. Which code may represent 'tall'?
- A. ka
- B. mi
- C. zo (Correct)
- D. pa
Explanation: The common word in both statements is 'tall', and the common code is 'zo'.