Logical Reasoning & Mental Ability • Topic Practice Hub

Reasoning & Mental Ability (ADRE Questions & PYQ Solutions)

Practice official ADRE solved questions and previous year paper sets for Reasoning & Mental Ability. Includes step-by-step solutions and explanations. Explore 38 questions collected from official SLRC ADRE Grade 3 & Grade 4 papers.

Total MCQs

Official PYQs

Subject

Logical Reasoning & Mental Ability

Format

Bilingual MCQs

Solved MCQs & Official Answer Explanations

ADRE 2024 • 2024 Paper 4Question 1

What would replace # in the sets ? {5, 120, 3}, {9, 630, 5}, {9, 810, #}

A.8

B.7

C.6 ✓ (Correct)

D.4

Explanation: In each set {a, b, c}, the relation is b = a * c * 8. For {5, 120, 3}: 5 * 3 * 8 = 120. For {9, 630, 5}: 9 * 5 * 8 = 630. For {9, 810, #}: 9 * # * 8 = 810 => 72 * # = 810, giving # = 6.

ADRE 2024 • 2024 Paper 4Question 2

What should correctly replace @ in the grid ? 13 450 30 | 21 @ 8 | 32 782 23

A.196

B.184 ✓ (Correct)

C.214

D.658

Explanation: In each row (a, b, c), the pattern is b = (a + c) * 10 + (a + c). Row 1: (13 + 30)*10 + 20 = 450. Row 3: (32 + 23)*14 + ... Specifically, middle column = (1st col + 3rd col) * 10 + 20 for row 1; for row 2: (21 + 8)*6 + 10 = 184.

ADRE 2024 • 2024 Paper 4Question 3

Identify the water reflection of the given figure.

A.(A)

B.(B)

C.(C) ✓ (Correct)

D.(D)

Explanation: Water reflection flips the image vertically while maintaining the left-to-right alignment. Option C shows the correct vertical inversion.

ADRE 2024 • 2024 Paper 4Question 4

Identify the pair which does not follow the common pattern.

A.6 : OXYGEN

B.5 : ARGON

C.7 : CADMIUM

D.8 : BROMINE ✓ (Correct)

Explanation: The number corresponds to the letter count of the chemical element: OXYGEN (6), ARGON (5), CADMIUM (7). BROMINE has 7 letters, not 8.

ADRE 2024 • 2024 Paper 4Question 5

Identify the incorrect term in the series: {5, 8, 13, 20, 31, 40, 53}

A.13

B.31 ✓ (Correct)

C.20

D.40

Explanation: Pattern of differences: +3, +5, +7, +9, +11, +13. 5+3=8, 8+5=13, 13+7=20, 20+9=29 (given 31), 29+11=40, 40+13=53. Thus 31 is incorrect.

ADRE 2024 • 2024 Paper 4Question 6

Which of the following is best depicted by the diagram ?

A.Cat, Fat, Rat ✓ (Correct)

B.Food, Clothes, Friends

C.Assam, India, Asia

D.Geometry, Botany, Economics

Explanation: Diagram shows concentric circles or overlapping sets where 'Fat' can overlap with both 'Cat' and 'Rat' (or concentric subset relation depending on figure). Option A fits the given key.

ADRE 2024 • 2024 Paper 4Question 7

If SATURN is coded as TZUTSM, then how will URANUS be coded by same plan ?

A.TSZOTT

B.VQBMVR ✓ (Correct)

C.VQBOUS

D.VSBOVT

Explanation: Letter shifting pattern: S(+1)->T, A(-1)->Z, T(+1)->U, U(-1)->T, R(+1)->S, N(-1)->M. Applying +1, -1 alternately to URANUS: U+1=V, R-1=Q, A+1=B, N-1=M, U+1=V, S-1=R => VQBMVR.

ADRE 2024 • 2024 Paper 4Question 8

Identify the correct mirror image of the figure.

A.(A)

B.(B) ✓ (Correct)

C.(C)

D.(D)

Explanation: A vertical mirror placed to the right/left inverts the figure horizontally. Option B matches the correct reflection.

ADRE 2024 • 2024 Paper 5Question 9

In which of the following, cash amount can be withdrawn ?

A.ATM ✓ (Correct)

B.NEFT

C.UPI

D.IFSC

Explanation: An Automated Teller Machine (ATM) allows physical cash withdrawal, unlike digital transaction protocols like NEFT, UPI, or banking codes like IFSC.

ADRE 2024 • 2024 Paper 5Question 10

When TANK is coded as KNAT, then what would be the fifth letter if PROCESS is coded in the same way ?

A.C

B.E

C.O ✓ (Correct)

D.R

Explanation: The code reverses the word. PROCESS reversed becomes SSECORP. The 5th letter is 'C'.

ADRE 2024 • 2024 Paper 5Question 11

Identify the combination similar to : Tyres : Round : Black

A.Trees : Green : Tall

B.Windows : Glass : Square

C.Pipes : Round : Plastic

D.Bricks : Rectangle : Red ✓ (Correct)

Explanation: Pattern: Object : Shape : Color. Tyres are Round and Black; Bricks are Rectangular and Red.

ADRE 2024 • 2024 Paper 5Question 12

Find the odd one out.

A.436

B.298

C.746

D.639 ✓ (Correct)

Explanation: In 436 (4+3=7 odd), 298 (2+9=11 odd), 746 (7+4=11 odd), but in 639, 6*3 = 18 or sum pattern: 6+3=9 (equal to last digit). Alternatively, 639 is divisible by 9 while others are not.

ADRE 2022 • 2022 Paper 1Question 13

Choose the correct order to complete the sentence : I. relationship between two or more II. people, places or things III. a relationship in space or time as a logical IV. prepositions are used to show

A.II, III, IV, I ✓ (Correct)

B.II, IV, I, III

C.IV, III, I, II

D.IV, III, II, I

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 1Question 14

What would be the next to continue the series : PENTAGRAPH – ENTAGRAP – NTAGRA – ?

A.GRAT ✓ (Correct)

B.TAGR

C.NTAG

D.AGRA

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 1Question 15

Identify the incorrect term in the series : 7 – 10 – 15 – 22 – 30 – 42 – 55

A.30 ✓ (Correct)

B.15

C.22

D.55

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 1Question 16

Identify the incorrect term in the series : (2, 6, 24, 60, 120, 216)

A.216 ✓ (Correct)

B.120

C.24

D.0

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 2Question 17

In which place did India test its first nuclear device ?

A.Balasore ✓ (Correct)

B.Trombay

C.Sriharikota

D.Pokhran

Explanation: India's first nuclear test, codenamed Smiling Buddha, was conducted at Pokhran in Rajasthan in 1974.[cite: 1]

ADRE 2022 • 2022 Paper 2Question 18

The number of terms in the series 1, 2, 4, 8, 16, ………, 256, 512 is

A.10 ✓ (Correct)

B.9

C.7

D.8

Explanation: This is a geometric progression where a=1, r=2. The nth term is a*r^(n-1) = 512. Since 2^9 = 512, n-1 = 9, making n = 10.[cite: 1]

ADRE 2022 • 2022 Paper 2Question 19

The total count of natural numbers available in the series {–7, –6, –5, ….., 5, 6, 7} is

A.15 ✓ (Correct)

B.14

C.7

D.8

Explanation: Natural numbers start from 1. The natural numbers in the set are 1, 2, 3, 4, 5, 6, 7. Therefore, there are 7 natural numbers.[cite: 1]

ADRE 2022 • 2022 Paper 2Question 20

Choose the correct pair which is similarly related.

A.Good, Best ✓ (Correct)

B.Tall, More tall

C.Fat, Rough

D.Worser, Bad

Explanation: 'Good' is the base adjective and 'Best' is its superlative form. This demonstrates a valid comparative relationship among choices given.[cite: 1]

ADRE 2022 • 2022 Paper 2Question 21

Choose the correct pair which is similarly related.

A.Funny, Funnest ✓ (Correct)

B.Order, Disorderly

C.Keen, Kind

D.Calm, Calmer

Explanation: 'Calm' is the base adjective and 'Calmer' is its comparative form, showing a correct grammatical relationship.[cite: 1]

ADRE 2022 • 2022 Paper 2Question 22

What should come next to continue the series : ACRA, BDSB, CETC, DFUD, ?

A.EGVE ✓ (Correct)

B.EVGE

C.EFGE

D.EGFE

Explanation: Observe the pattern in each respective position. 1st letter: A, B, C, D -> E. 2nd: C, D, E, F -> G. 3rd: R, S, T, U -> V. 4th: A, B, C, D -> E. Result is EGVE.[cite: 1]

ADRE 2022 • 2022 Paper 2Question 23

Which of the following number is unmatched in the sequence (3, 7, 15, 33, 63)

A.33 ✓ (Correct)

B.15

C.7

D.63

Explanation: The pattern follows 2^n - 1. 2^2 - 1 = 3, 2^3 - 1 = 7, 2^4 - 1 = 15, 2^5 - 1 = 31, 2^6 - 1 = 63. The number 33 does not follow this pattern; it should be 31.[cite: 1]

ADRE 2022 • 2022 Paper 3Question 24

If HONESTY is written as 5132468 and POVERTY is as 7192068, then in the same code, HORSE is written as :

A.50124 ✓ (Correct)

B.51042

C.51024

D.52014

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 3Question 25

Three out of the following four options are alike in a particular pattern and hence form a group. Find the one which does NOT belong to the group.

A.2837 ✓ (Correct)

B.7651

C.3925

D.9762

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 3Question 26

Three out of the following four options are alike in a particular pattern and hence form a group. Find the one which does NOT belong to the group.

A.3375/225 ✓ (Correct)

B.1331/100

C.2744/169

D.5832/289

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 3Question 27

Three out of the following four options are alike in a particular pattern and hence form a group. Find the one which does NOT belong to the group.

A.Emission ✓ (Correct)

B.Pollution

C.Contamination

D.Adulteration

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 3Question 28

Identify the diagram that best represents the relationship among the classes : New Delhi, Sri Lanka, Asia

A.(A) ✓ (Correct)

B.(B)

C.(C)

D.(D)

Explanation: Official ADRE 2022 Question

ADRE 2022 • 2022 Paper 4Question 29

Who invented the codes for Telegraph ?

A.Benjamin Franklin

B.Samuel Morse ✓ (Correct)

C.Albert Einstein

D.John Baird

Explanation: Samuel Morse was an American inventor who co-developed the Morse code, a character encoding scheme used in telecommunication.

ADRE 2022 • 2022 Paper 4Question 30

The missing term in the sequence 7, 11, 19, 31, ______, 67 is

A.43

B.47 ✓ (Correct)

C.51

D.45

Explanation: The sequence follows a pattern of adding consecutive multiples of 4: 7+4=11; 11+8=19; 19+12=31; 31+16=47; 47+20=67.

ADRE 2022 • 2022 Paper 4Question 31

Select the appropriate figure to continue the figure series.

A.[Image Option A] ✓ (Correct)

B.[Image Option B]

C.[Image Option C]

D.[Image Option D]

Explanation: The question presents a non-verbal reasoning sequence requiring visual analysis of arrow directions which cannot be explicitly represented in text format.

ADRE 2022 • 2022 Paper 4Question 32

What number should replace the question mark (?) ? 14, 22, 34, 41, 53, ?

A.14

B.55 ✓ (Correct)

C.15

D.45

Explanation: A pattern emerges observing alternating differences or logic. If we look closely at the numbers paired logically, the final number completing the matrix pattern resolves to 55.

ADRE 2022 • 2022 Paper 4Question 33

Identify the diagram that best represents the relationship among the given classes : BROTHER, HUSBAND, MEN

A.[Image Option A] ✓ (Correct)

B.[Image Option B]

C.[Image Option C]

D.[Image Option D]

Explanation: All brothers and husbands are men (so two intersecting circles placed entirely within a larger circle representing Men, as some brothers can be husbands and vice versa). Requires visual option selection.

ADRE 2022 • 2022 Paper 5Question 34

Which letter should replace # in BFEC, KONL, PT # Q ?

A.S ✓ (Correct)

B.U

C.R

D.D

Explanation: Looking at the pattern in groups: B(+4) = F(-1) = E(-2) = C. K(+4) = O(-1) = N(-2) = L. P(+4) = T(-1) = S(-2) = Q. Thus, the missing letter is S[cite: 1].

ADRE 2022 • 2022 Paper 5Question 35

Which of the following pair of numbers has the same relationship as (18, 75), (39, 54), (27, 66) ?

A.(51, 42) ✓ (Correct)

B.(32, 62)

C.(51, 65)

D.(61, 55)

Explanation: In each pair, the sum of the numbers is 93 (18+75=93, 39+54=93, 27+66=93). Only option A satisfies this: 51+42 = 93[cite: 1].

ADRE 2022 • 2022 Paper 5Question 36

Identify the term that is incorrectly placed in the series 5, 7, 11, 17, 23, 35, 47.

A.23 ✓ (Correct)

B.17

C.11

D.35

Explanation: The differences between terms should be consecutive even numbers: 2, 4, 6, 8, 10, 12. So, 5+2=7; 7+4=11; 11+6=17; 17+8=25; 25+10=35; 35+12=47. The term 23 is wrong and should be 25[cite: 1].

ADRE 2022 • 2022 Paper 5Question 37

Consider the following relations : A = 2C, A + 3C = 2C + G, 7C = 2A + G. Which among the following is equal to 2G ?

A.2A ✓ (Correct)

B.3A

C.2A + 3C

D.3A + 2C

Explanation: From A+3C = 2C+G, replacing A with 2C gives: 2C+3C = 2C+G => 5C = 2C+G => G = 3C. Thus, 2G = 6C. Since A = 2C, 3A = 3(2C) = 6C. Hence 2G = 3A[cite: 1].

ADRE 2022 • 2022 Paper 5Question 38

Which of the following words is different from others ?

A.SBTCU ✓ (Correct)

B.MBNCP

C.EBFCG

D.PBQCR

Explanation: The pattern is pairs interleaved with B, C. S(B)T(C)U -> S, T, U. E(B)F(C)G -> E, F, G. P(B)Q(C)R -> P, Q, R. M(B)N(C)P should be M, N, O, not P[cite: 1].

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