Official Paper

PYST 15: IB Security Assistant (Executive) Official Paper - Logical Ability & Reasoning (Held On: 30 Sept, 2025 Shift 3) (Previous Year Paper)

20 questions · 15 minutes · with answers · free

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Test (20 questions)

1

If 'A' stands for '÷', 'B' stands for 'x', 'C' stands for '+' and 'D' stands for '-', what will come in place of the question mark (?) in the following equation?

<br>

21 B 4 D 72 A 8 C 7 = ?

  1. ((a))

    68

  2. ((b))

    78

  3. ((c))

    82

  4. ((d))

    63

Show Answer
Answer: ((c))

82

Given : 21 B 4 D 72 A 8 C 7 = ?

'A' stands for '÷', 'B' stands for 'x', 'C' stands for '+' and 'D' stands for '-'

21 x 4 - 72 ÷ 8 + 7 = ?

21 x 4 - 9 + 7 = ?

84 + 7 - 9  = ?

91 - 9  = ?

= 82.

Hence, the correct answer is "Option 3"

2

In a certain code language, 'we are here' is written as 'yt bg ji' and 'you know we' is coded as 'kl bg gb'. How is 'we' coded in that language?

  1. ((a))

    yt

  2. ((b))

    gb

  3. ((c))

    ji

  4. ((d))

    bg

Show Answer
Answer: ((d))

bg

The logic follows here, 

'we are here' -  'yt bg ji' 

'you know we' -  'kl bg gb'

The Code for we is bg.

Hence, the correct answer is "Option 4"

3

In the following number-pairs, the second number is obtained by applying certain mathematical operation(s) to the first number. Select the number-pair in which the numbers are related in the same way as are the numbers of the following pairs.

(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding to/subtracting from/multiplying with 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

<br>

9,85

8,68

  1. ((a))

    7,49

  2. ((b))

    11,125

  3. ((c))

    12,146

  4. ((d))

    10,100

Show Answer
Answer: ((b))

11,125

The Logic follows here, 

Logic:  (First Number)2 + 4 = Second Number

Similarly,

11,125

112 + 4 = 125

Hence, the correct answer is "Option 2"

4

Each of P, Q, R, S, T, U and V has an exam on a different day of a week, starting from Monday and ending on Sunday of the same week. U has an exam on Wednesday. Exactly 4 people have exams between P and V, neither of whom has an exam on Monday. Q has an exam immediately before R and S has an exam immediately after R. T has an exam immediately before P. How many people have exams between U and V?

  1. ((a))

    4

  2. ((b))

    2

  3. ((c))

    1

  4. ((d))

    3

Show Answer
Answer: ((d))

3

Each of P, Q, R, S, T, U and V has an exam on a different day of a week, starting from Monday and ending on Sunday of the same week.

  • U has an exam on Wednesday.
  • Exactly 4 people have exams between P and V, neither of whom has an exam on Monday.
  • Q has an exam immediately before R and S has an exam immediately after R.
  • T has an exam immediately before P

The Final Arrangement is, 

MonT
TueP
WedU
ThuQ
FriR
SatS
SunV

 

Hence, the correct answer is "Option 4"

5

What should come in place of the question mark (?) in the given series?

<br>

6 9 21 39 81 ?

  1. ((a))

    158

  2. ((b))

    159

  3. ((c))

    160

  4. ((d))

    157

Show Answer
Answer: ((b))

159

Given : 6 9 21 39 81 ?

  • 9 = (6 × 2) - 3
  • 21 = (9 × 2) + 3
  • 39 = (21 × 2) - 3
  • 81 = (39 × 2) + 3
  • (81 × 2) - 3 = ?
  • 162 - 3 = ?
  • 159
  • Hence, the correct answer is "Option 2"
6

Refer to the given letter series and answer the question that follows. Counting to be done from left to right.

<br>

(Left) CCQOISJSMXHUVQRHDPCHY (Right)

<br>

How many such consonants are there, each of which is immediately preceded by a vowel and also immediately followed by a vowel?

  1. ((a))

    Two

  2. ((b))

    None

  3. ((c))

    Three

  4. ((d))

    One

Show Answer
Answer: ((b))

None

The logic follows here,

Required Conditions: Vowel , consonants , Vowel

(Left) CCQOISJSMXHUVQRHDPCHY (Right)

Hence, the correct answer is "Option 2"

7

P, Q, R, S, T, U and V are sitting in a row, facing north. Only two people sit to the left of Q. Only three people sit between Q and S. Only one person sits between S and V. U sits to the immediate left of P. T is not an immediate neighbour of S. How many people sit between U and V?

  1. ((a))

    1

  2. ((b))

    2

  3. ((c))

    3

  4. ((d))

    4

Show Answer
Answer: ((c))

3

P, Q, R, S, T, U and V are sitting in a row, facing north.

  • Only two people sit to the left of Q.
  • Only three people sit between Q and S.
  • Only one person sits between S and V.
  • U sits to the immediate left of P.
  • T is not an immediate neighbour of S

 

The Final Arrangement is, 

Hence, the correct answer is "Option 3"

8

What should come in place of the question mark (?) in the given series?

<br>

11 17 32 58 93 139 ?

  1. ((a))

    196

  2. ((b))

    214

  3. ((c))

    204

  4. ((d))

    194

Show Answer
Answer: ((d))

194

The logic follows here, 

Hence, the correct answer is "Option 4"

9

Refer to the following letter and symbol series and answer the question that follows.

Counting to be done from left to right only.

<br>

(Left) RLZT@$ODU%WN#*KXV£YA & QPS (Right)

<br>

How many such letters are there that are immediately preceded by a letter and also immediately followed by another symbol?

  1. ((a))

    Five

  2. ((b))

    Four

  3. ((c))

    Three

  4. ((d))

    Six

Show Answer
Answer: ((a))

Five

Given Series:  (Left) RLZT@$ODU%WN#*KXV£YA & QPS (Right)

Required Conditions:  Letter, Letter, Another Symbol

 (Left)    RLZT@$O**DU%WN#KXV£YA &* QPS    (Right)

Hence, the correct answer is "Option 1"

10

Select the pair that follows the same pattern as the one followed by the two pairs given below. Both pairs follow the same pattern.

<br>

YGB: WJX

ΝΑΙ : LDE

  1. ((a))

    KOC: IQA

  2. ((b))

    REM: PHI

  3. ((c))

    JQV: GTS

  4. ((d))

    SLH: QND

Show Answer
Answer: ((b))

REM: PHI

alpha teb

The pattern followed here is:

Hence, the correct answer is "Option 2"

11

In a certain code language,

'A + B' means 'A is the daughter of B',

'A - B' means 'A is the brother of B',

'A × B' means 'A is the wife of B' and

'A ÷ B' means 'A is the father of B'.

How is C related to M if 'C + V X R - N - M'?

  1. ((a))

    Mother

  2. ((b))

    Wife

  3. ((c))

    Niece

  4. ((d))

    Daughter

Show Answer
Answer: ((c))

Niece

Preparing the family tree diagram by using the following symbols:

qImage651b84836d0b10110262bc38

 

Based on the expression 'C + V X R - N - M':

  1. C + V: C is the daughter of V.
  2. V X R: V is the wife of R (so R is the father of C).
  3. R - N: R is the brother of N.
  4. N - M: N is the brother of M.
    Since R is the brother of M and C is the daughter of R, C is the niece of M.
12

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

<br>

Statements:

All vegetables are lemons.

All fruits are lemons.

<br>

Conclusions:

(I): Some vegetables are fruits

(II): Some lemons are fruits

  1. ((a))

    Only conclusion (I) follows

  2. ((b))

    Both conclusions (I) and (II) follow

  3. ((c))

    Only conclusion (II) follows

  4. ((d))

    Neither conclusion (I) nor (II) follows

Show Answer
Answer: ((c))

Only conclusion (II) follows

The least possible Venn diagram is as follows:

Conclusions:

(I): Some vegetables are fruits- False (As their is no direct relation between vegetables and fruits may be it is possible but not definite.Hence, it is false)

(II): Some lemons are fruits- True (All fruits are lemons.Some fruits are lemons and some lemons are fruits. Hence, it is True)

Only conclusion (II) follows

Hence, the correct answer is "Option 3"

13

In a certain code language, 'GREAT' is coded as '42571', 'FRESH' is coded as '37648' and 'FLASH' is coded as '68953'. What is the code for 'L' in that language?

  1. ((a))

    8

  2. ((b))

    9

  3. ((c))

    5

  4. ((d))

    6

Show Answer
Answer: ((b))

9

'GREAT' is coded as '42571', 'FRESH' is coded as '37648' and 'FLASH' is coded as '68953'

'F L  A S H' -  '6 8 9 5 3'

Code for L is 9.

Hence, the correct answer is "Option 2"

14

Each of P, Q, R, S, T, U and V has an exam on a different day of a week starting from Monday and ending on Sunday of the same week. No one has exam before Q. Only three people have exams between Q and V. Only one person has an exam between V and P. U has an exam on Wednesday. T has an exam on one of the days after S but on one of the days before R. How many people have exams between R and U?

  1. ((a))

    One

  2. ((b))

    Two

  3. ((c))

    Three

  4. ((d))

    Four

Show Answer
Answer: ((b))

Two

Each of P, Q, R, S, T, U and V has an exam on a different day of a week starting from Monday and ending on Sunday of the same week.

  • No one has exam before Q.
  • Only three people have exams between Q and V.
  • Only one person has an exam between V and P.
  • U has an exam on Wednesday.
  • T has an exam on one of the days after S but on one of the days before R

The Final Arrangement is, 

MonQ
TueS
WedU
ThuT
FriV
SatR
SunP

 

Hence, the correct answer is "Option 2"

15

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

<br>

Statements:

Some trees are cows.

All cows are fishes.

<br>

Conclusions:

(I) Some trees are fishes.

(II) All fishes are cows.

  1. ((a))

    Neither conclusion (I) nor (II) follows.

  2. ((b))

    Only conclusion (II) follows.

  3. ((c))

    Only conclusion (I) follows.

  4. ((d))

    Both conclusions (I) and (II) follow.

Show Answer
Answer: ((c))

Only conclusion (I) follows.

The least possible Venn diagram is as follows:

Conclusions:

(I) Some trees are fishes.- True (Some trees are cows.All cows are fishes.Some trees are fishes is True)

(II) All fishes are cows.- False (All cows are fishes. All fishes are cows is may be possible but not definite. Hence, it is false)

Only conclusion (I) follows.

Hence, the correct answer is "Option 3"

16

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster DOES NOT belong to that group?

(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

  1. ((a))

    XB - UX

  2. ((b))

    KS - HO

  3. ((c))

    MQ - JM

  4. ((d))

    TE - PB

Show Answer
Answer: ((d))

TE - PB

alpha teb

The pattern followed here is:

Hence, the correct answer is "Option 4"

17

Vishal starts from Point A and drives 6 km towards west. He then takes a left turn, drives 1 km, turns left and drives 8 km. He then takes a left turn and drives 5 km. He takes a final left turn, drives 2 km and stops at Point P. How far (shortest distance) and towards which direction should he drive in order to reach Point A again?

<br>

(All turns are 90° turns only unless specified.)

  1. ((a))

    5 km south

  2. ((b))

    4 km south

  3. ((c))

    3 km south

  4. ((d))

    2 km south

Show Answer
Answer: ((b))

4 km south

  • Vishal starts from Point A and drives 6 km towards west.
  • He then takes a left turn, drives 1 km, turns left and drives 8 km.
  • He then takes a left turn and drives 5 km.
  • He takes a final left turn, drives 2 km and stops at Point P

 

The Final Diagram, 

Hence, the correct answer is "Option 2"

18

Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which is the letter-cluster pair that DOES NOT belong to that group?

<br>

(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

  1. ((a))

    MD-GK

  2. ((b))

    QH-KO

  3. ((c))

    OF-IM

  4. ((d))

    KB-EJ

Show Answer
Answer: ((d))

KB-EJ

alpha teb

The pattern followed here is:

Hence, the correct answer is "Option 4"

19

In a certain code language,

A# B means 'A is the daughter of B',

A@B means 'A is the father of B',

A + B means 'A is the son of B',

and A & B means 'A is the sister of B'.

How is B related to W if 'B # F + R @ H & W'?

  1. ((a))

    Brother

  2. ((b))

    Son

  3. ((c))

    Brother's daughter

  4. ((d))

    Father

Show Answer
Answer: ((c))

Brother's daughter

Preparing the family tree diagram by using the following symbols:

qImage651b84836d0b10110262bc38

 

Hence, the correct answer is "Option 3"

20

Six people, M, N, O, P, X and Y, are sitting in a row facing north. Exactly four people sit between Y and O. P sits second to the right of O. N sits to the immediate right of X. Who among them sits to the immediate left of M?

  1. ((a))

    O

  2. ((b))

    P

  3. ((c))

    X

  4. ((d))

    Y

Show Answer
Answer: ((a))

O

  • Six people, M, N, O, P, X and Y, are sitting in a row facing north.
  • Exactly four people sit between Y and O.
  • P sits second to the right of O.
  • N sits to the immediate right of X

The Final Arrangment is,

Hence, the correct answer is "Option 1"

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