Analogy and Classification: 15-Question Review

How to use this review

Attempt the questions after studying both lessons. Use ordinary word meanings, basic number properties and English-alphabet positions A=1 to Z=26. Number patterns use simple consistent rules; test all supplied pairs and options rather than inventing exceptions. Letter shifts do not wrap around beyond A or Z.

There are 15 original questions, worth one mark each. This learning review is untimed, with no negative marking and no pass cutoff. A suggested 20 minutes is a study aid, not an official exam duration. This topic review does not simulate the full RRB CBT, which has its own marking rules.

Record an answer and a short rule before consulting the explanations. If wrong, label the cause: relationship, direction, property, arithmetic, letter position or missed instruction.

Questions

1. Thermometer : Temperature :: Clock : ?

A. Wall B. Clockmaker C. Time D. Metal

2. Handle : Cup :: Roof : ? Use the direct structural relationship.

A. House B. Tile C. Builder D. Shade

3. Car : Vehicle :: Sparrow : ?

A. Wing B. Bird C. Nest D. Seed

4. Which item does not belong with the other three in the ordinary meaning of the words?

A. Spoon B. Fork C. Plate D. Mountain

5. Which plane figure differs because its boundary is curved rather than made only of straight line segments?

A. Rectangle B. Hexagon C. Oval D. Triangle

6. The pairs are 2 → 10 and 5 → 25. Choose the value for 7 under the same simple rule.

A. 12 B. 35 C. 49 D. 30

7. The pairs are 3 → 8 and 6 → 35. Choose the value for 10 under the same simple rule.

A. 20 B. 100 C. 101 D. 99

8. The pairs are 2 → 9 and 5 → 21. Choose the value for 8 under the same simple rule.

A. 33 B. 32 C. 36 D. 65

9. Which number is not a perfect square?

A. 25 B. 49 C. 81 D. 91

10. Which group consists entirely of prime numbers?

A. 1, 3, 5 B. 2, 9, 11 C. 3, 5, 7 D. 4, 7, 13

11. CF : EH :: MP : ? Use the same forward shift for each letter.

A. OR B. NQ C. RO D. OS

12. GK : EI :: NR : ? Use the same backward shift for each letter.

A. PT B. LP C. MP D. PL

13. The transformations are AC → DB and EH → IF. Which option follows the same simple two-step pattern for KM?

A. LN B. ML C. NL D. NO

14. Three pairs have the same forward difference between alphabet positions. Which pair is different?

A. DG B. JM C. PS D. UW

15. How many English-alphabet letters lie strictly between H and O?

A. 7 B. 6 C. 5 D. 8

Explained answers

1. C — The relation is instrument → quantity indicated. A clock indicates time. Wall is a possible location, clockmaker a person and metal a material.
2. A — A handle is part of a cup; a roof is part of a house. Tile points to a part of the roof and reverses the direction.
3. B — A car is a type of vehicle; a sparrow is a type of bird. Wing, nest and seed are associated with a bird but are not its category.
4. D — Spoon, fork and plate are dining utensils/tableware. A mountain is a landform. This shared group explains all three entries together.
5. C — The oval has a curved boundary. The rectangle, hexagon and triangle have only straight-sided boundaries.
6. B — Multiplying by 5 fits both pairs, so 7×5=35. Squaring happens to fit 5→25 but fails 2→10.
7. D — The rule n²−1 gives 9−1=8 and 36−1=35. For 10 it gives 100−1=99. 100 omits subtraction; 101 changes it to addition.
8. A — 4n+1 fits both supplied pairs. For 8 it gives 4×8+1=33. Adding one before multiplying gives 36 and does not fit the supplied pairs.
9. D — 25=5², 49=7² and 81=9². 91 lies between 9²=81 and 10²=100, so it is not a perfect square.
10. C — 3, 5 and 7 each have exactly two positive divisors. The other groups contain 1, 9 or 4 respectively; 1 is not prime and 9 and 4 are composite.
11. A — C→E and F→H are +2 shifts. M→O and P→R give OR. RO reverses the positions; OS shifts the second letter too far.
12. B — G→E and K→I are −2 shifts. N→L and R→P give LP. The order of the two positions stays unchanged.
13. C — Reverse the pair, then shift each letter +1: AC→CA→DB and EH→HE→IF. KM→MK→NL. LN shifts without reversing.
14. D — DG, JM and PS each move +3 positions. UW moves from 21 to 23, a difference of +2.
15. B — H=8 and O=15. Excluding both endpoints gives 15−8−1=6: I, J, K, L, M, N. The position difference itself is 7.

Quick reference

Review checklist

• Keep the same relation and direction
• Test a shared property across the whole group
• Verify a number rule on every supplied pair
• Keep the English alphabet and operation order fixed
• Separate position difference from letters between
• Read the explanation, identify the error type, and retry without looking