Previous Year Paper

PYST 13: IB Security Assistant (Executive) Official Paper - Logical Ability & Reasoning (Held On: 30 Sept, 2025 Shift 1) (Previous Year Paper)

Held in 2025

20 questions15 minutes

With answers

Free

Paper last updated: 15 October 2026

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Questions & answers

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Question 1

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 - R × N ÷ M'?

AOption (a)
Father's brother's wife
BOption (b)
Mother's brother's wife
COption (c)
Mother's brother's daughter
DOption (d)
Father's brother's daughter

View answer & explanation

Correct answer

Mother's brother's daughter

Why this answer is correct

Preparing the family tree diagram by using the following symbols:

Hence, the correct answer is "Option 3"

Question 2

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.

Statements:

Some plants are climbers.

All climbers are trees.

Conclusions:

(I) Some trees are plants.

(II) All plants are trees.

AOption (a)
Only conclusion (II) follows.
BOption (b)
Both conclusions (I) and (II) follow.
COption (c)
Neither conclusion (I) nor (II) follows.
DOption (d)
Only conclusion (I) follows.

View answer & explanation

Correct answer

Only conclusion (I) follows.

Why this answer is correct

The least possible Venn diagram is as follows:

Conclusions:

(I) Some trees are plants. - True (Some plants are climbers.All climbers are trees.Some trees are plants is True)

(II) All plants are trees - False (Some plants are climbers.All climbers are trees.All plants are trees is may be possible but not definite hence it is false)

Only conclusion (I) follows.

Hence, the correct answer is "Option 4"

Question 3

Each of P, Q, R, S, T, U and V has an exam on a different day of the week starting on Monday and ending on Sunday of the same week. Only two people have an exam before R. Only one person has an exam after S. Only three people have an exam between R and U. Only one person has an exam between P and V. Q has an exam immediately before P. Who has an exam on Monday?

AOption (a)
T
BOption (b)
V
COption (c)
U
DOption (d)
Q

View answer & explanation

Correct answer

Why this answer is correct

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

Only two people have an exam before R.
Only one person has an exam after S.
Only three people have an exam between R and U.
Only one person has an exam between P and V.
Q has an exam immediately before P.

The Final Arrangement is,

Mon	Q
Tue	P
Wed	R
Thu	V
Fri	T
Sat	S
Sun	U

Hence, the correct answer is "Option 4"

Question 4

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

7 18 32 68 132 ?

AOption (a)
266
BOption (b)
265
COption (c)
268
DOption (d)
267

View answer & explanation

Correct answer

268

Why this answer is correct

The logic follows here,

Each term is multiplied by 2, and then +4 and −4 alternate.

7 × 2 + 4 = 18
8 × 2 − 4 = 32
32 × 2 + 4 = 68
68 × 2 − 4 = 132

Now apply the same rule to the next term:

132 × 2 + 4 = 268

Hence, the correct answer is "Option 3"

Question 5

Statements:

All envelopes are kites.

Some kites are trains.

Conclusions:

(I) All trains are kites.

(II) Some envelopes are trains.

AOption (a)
Both conclusions (I) and (II) follow.
BOption (b)
Only conclusion (II) follows.
COption (c)
Only conclusion (I) follows.
DOption (d)
Neither conclusion (I) nor (II) follows.

View answer & explanation

Correct answer

Neither conclusion (I) nor (II) follows.

Why this answer is correct

The least possible Venn diagram is as follows:

Conclusions:

(I) All trains are kites. - False (Some Kites are Trains and Some Trains are Kites. Hence, it is false)

(II) Some envelopes are trains.- False (All Envelopes are Kites.Some Kites are Trains. Hence, it false)

Neither conclusion (I) nor (II) follows.

Hence, the correct answer is "Option 4"

Question 6

Seven people, W, X, Y, Z, E, F and G are sitting in a straight line, facing north. Only five people sit between G and E. Z sits to the immediate left of E. Only one person sits between Z and F. W sits at some place to the left of Y but at some place to the right of X.

Who sits third from the left end of the line?

AOption (a)
Y
BOption (b)
W
COption (c)
G
DOption (d)
X

View answer & explanation

Correct answer

Why this answer is correct

Seven people, W, X, Y, Z, E, F and G are sitting in a straight line, facing north.

Only five people sit between G and E.
Z sits to the immediate left of E.
Only one person sits between Z and F.
W sits at some place to the left of Y but at some place to the right of X

The Final Arrangement is ,

Hence, the correct answer is "Option 2"

Question 7

In a certain code language,

A = B means 'A is the sister 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 A related to K if 'A = R @ F * B $ K'?

AOption (a)
Mother's sister
BOption (b)
Sister
COption (c)
Mother
DOption (d)
Mother's mother

View answer & explanation

Correct answer

Mother's sister

Why this answer is correct

Hence, the correct answer is "Option 1"

Question 8

In a certain code language, 'ONBE' is coded as '5781' and 'BANE' is coded as '1678'.

What is the code for 'A' in the given code language?

AOption (a)
7
BOption (b)
6
COption (c)
8
DOption (d)
1

View answer & explanation

Correct answer

Why this answer is correct

Given: 'ONBE' is coded as '5781' and 'BANE' is coded as '1678'.

O N B E - 5 7 8 1

B A N E - 1 6 7 8

The Code for A is 6.

Hence, the correct answer is "Option 2"

Question 9

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 letter-cluster pair 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.)

AOption (a)
TE – XH
BOption (b)
VL - AP
COption (c)
LY - PB
DOption (d)
DS - HV

View answer & explanation

Correct answer

VL - AP

Why this answer is correct

The pattern followed here is:

Option 1.

Option 2.

Option 3.

option 4.

Odd one is

Hence, the correct answer is "Option 2"

Question 10

Each of A, B, C, E, F, G and K has an exam on a different day of a week starting from Monday and ending on Sunday of the same week. C has the exam on Thursday. Only one person has the exam between E and C, where E has the exam before C. Only four people have exams between G and E. F has the exam on one of the days after E. A has exam on the day immediately before K. How many people have the exam between K and F?

AOption (a)
Four
BOption (b)
One
COption (c)
Three
DOption (d)
Two

View answer & explanation

Correct answer

Two

Why this answer is correct

Each of A, B, C, E, F, G and K has an exam on a different day of a week starting from Monday and ending on Sunday of the same week.

C has the exam on Thursday.
Only one person has the exam between E and C, where E has the exam before C.
Only four people have exams between G and E.
F has the exam on one of the days after E.
A has exam on the day immediately before K

The Final Arrangement is,

Mon	B
Tue	E
Wed	F
Thu	C
Fri	A
Sat	K
Sun	G

Hence, the correct answer is "Option 4"

Question 11

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

(Left) Q K Y S @ $ N C T % V M # * J W U £ X Z & P O R (Right)

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

AOption (a)
None
BOption (b)
One
COption (c)
Two
DOption (d)
Three

View answer & explanation

Correct answer

Two

Why this answer is correct

Given : (Left) Q K Y S @ $ N C T % V M # * J W U £ X Z & P O R (Right)

Required Condition : Letter - Symbol - Another Symbol

(Left) Q K Y S @ $ N C T % V **M # *** J W U £ X Z & P O R (Right)

Hence, the correct answer is "Option 3"

Question 12

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?

AB 10, EF 20, IJ 30, MN 40, ?

AOption (a)
RV 50
BOption (b)
QR 50
COption (c)
QV 60
DOption (d)
RS 70

View answer & explanation

Correct answer

QR 50

Why this answer is correct

The pattern followed here is:

Hence, the correct answer is "Option 2"

Question 13

Suvid starts from Point A and drives 9 km towards the south. He then takes a left turn, drives 7 km, turns left and drives 11 km. He then takes a left turn and drives 10 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? (All turns are 90-degree turns only unless specified.)

AOption (a)
4 km to the west
BOption (b)
3 km to the east
COption (c)
3 km to the west
DOption (d)
4 km to the east

View answer & explanation

Correct answer

3 km to the east

Why this answer is correct

Suvid starts from Point A and drives 9 km towards the south.
He then takes a left turn, drives 7 km, turns left and drives 11 km.
He then takes a left turn and drives 10 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"

Question 14

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

15, 32, 35, 72, 75, 152, ?

AOption (a)
163
BOption (b)
155
COption (c)
167
DOption (d)
160

View answer & explanation

Correct answer

155

Why this answer is correct

The logic follows here,

Hence, the correct answer is "Option 2"

Question 15

In a certain code language, 'RUDE' is coded as '7245' and 'DIMS' is coded as '1536'. How is 'D' coded in that language?

AOption (a)
1
BOption (b)
2
COption (c)
3
DOption (d)
5

View answer & explanation

Correct answer

Why this answer is correct

Given : 'RUDE' is coded as '7245' and 'DIMS' is coded as '1536'

'R U D E' - '7 2 4 5'

'D I M S' - '1 5 3 6'

The Code for D is 5.

Hence, the correct answer is "Option 4"

Question 16

Six people, A, B, C, M, N and O, are sitting around a circular table facing the centre. A sits third to the left of O. Only one person sits between A and C when counted from the left of A. Only two people sit between B and C. C is an immediate neighbour of N. How many people sit between M and N when counted from right of N?

AOption (a)
Two
BOption (b)
Three
COption (c)
One
DOption (d)
Four

View answer & explanation

Correct answer

Two

Why this answer is correct

Six people, A, B, C, M, N and O, are sitting around a circular table facing the centre.

A sits third to the left of O.
Only one person sits between A and C when counted from the left of A.
Only two people sit between B and C.
C is an immediate neighbour of N

The Final Arrangement is,

Hence, the correct answer is "Option 1"

Question 17

Each of the digits in the number 3485769 is arranged in ascending order from left to right. What will be the sum of the digits which are fifth from the left and fourth from the right in the new number thus formed?

AOption (a)
16
BOption (b)
14
COption (c)
13
DOption (d)
12

View answer & explanation

Correct answer

Why this answer is correct

Arrange digits in ascending order

Digits: 3, 4, 8, 5, 7, 6, 9

Ascending order: 3 4 5 6 7 8 9

5^th from the left → 7
4^th from the right → 6

Find the sum

7 + 6 = 13

Hence, the correct answer is "Option 3"

Question 18

If + means -, - means ×, × means ÷ and ÷ means +, then what will come in place of the question mark (?) in the following equation?

21 + 24 × 4 ÷ 15 - 2 = ?

AOption (a)
40
BOption (b)
48
COption (c)
47
DOption (d)
45

View answer & explanation

Correct answer

Why this answer is correct

Given : 21 + 24 × 4 ÷ 15 - 2 = ?

means -, - means ×, × means ÷ and ÷ means +

21 - 24 ÷ 4 + 15 x 2 = ?

21 - 6 + 15 x 2 = ?

21 + 30 - 6 = ?

Hence, the correct answer is "Option 4"

Question 19

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?

RFL 22, TIN 31, VLP 40, XOR 49, ?

AOption (a)
ZRT 58
BOption (b)
BTV 50
COption (c)
ATS 52
DOption (d)
ASU 55

View answer & explanation

Correct answer

ZRT 58

Why this answer is correct

The pattern followed here is:

Hence, the correct answer is "Option 1"

Question 20

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

Counting to be done from left to right only.

(Left) F A E # & U % Z U T > & S K L * = N M £ < G (Right)

How many such symbols are there, each of which is immediately preceded by a symbol

and immediately followed by a letter?

AOption (a)
Three
BOption (b)
Four
COption (c)
Two
DOption (d)
One

View answer & explanation

Correct answer

Four

Why this answer is correct

Given Series : (Left) F A E # & U % Z U T > & S K L * = N M £ < G (Right)

Required Conditions : Symbol, Symbol , Letter.

(Left) F A E # & U % Z U T > & S K L *** = N** M £ < G (Right)

(# & U), (> & S), (* = N), (£ < G)

Hence, the correct answer is "Option 2"

20 questions in the full paper

Mon

Tue

Wed

Thu

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Sun

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Sun