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Question 131

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

Choose the most appropriate option to complete the following series.

JKT, LOZ, NSF, PWL, ___

  1. AOption (a)

    RZQ

  2. BOption (b)

    SAS

  3. COption (c)

    RAR

  4. DOption (d)

    SZS

View answer & explanation

Correct answer

Answer: (c)C.

RAR

Why this answer is correct

The pattern is as follows:

Hence, “RAR” is the correct answer.

Question 132

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

How many pairs of letters are there in the word “CASTRATING” that has as many letters between them in the word as in the alphabet?

  1. AOption (a)

    Four

  2. BOption (b)

    Three

  3. COption (c)

    Two

  4. DOption (d)

    One

View answer & explanation

Correct answer

Answer: (a)A.

Four

Why this answer is correct

Clearly, we can see that 4 such pairs are there → ST, RN, RT, IG.

Hence, the answer is four.

Question 133

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

Seven friends  Ram, Raju, Raj, Sonu, Chotu, Dev and Sona are sitting in a straight line facing to north direction. Two persons are sitting between Ram and Raju. Sonu is sitting just right of Raju but just left of Dev, who is sitting at one of the extreme ends. Raj is on the immediate left of Chotu and Sona is not sitting at the extreme right end. Who is sitting third from the right end?

  1. AOption (a)

    Sona 

  2. BOption (b)

    Sonu

  3. COption (c)

    Ram

  4. DOption (d)

    Raju

View answer & explanation

Correct answer

Answer: (d)D.

Raju

Why this answer is correct

1) Two persons are sitting between Ram and Raju.

  1. Sonu is sitting just right of Raju but just left of Dev, who is sitting at one of the extreme ends. (from the statement, Dev is sitting at the right end)

3) Raj is on the immediate left of Chotu.

4) Sona is not sitting at the extreme right end. (it means sona is sitting at the left end) 

Hence, "Raju" is sitting third from the right end.

Question 134

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

Directions

Find the wrong term in the following series.

X3, U9, R27, O81, L343

  1. AOption (a)

    U9

  2. BOption (b)

    R27

  3. COption (c)

    O81

  4. DOption (d)

    L343

View answer & explanation

Correct answer

Answer: (d)D.

L343

Why this answer is correct

Given series: X3, U9, R27, O81, L343

The logic followed for the alphabet is:

The logic followed for the number is:

31 = 3

32 = 9

33 = 27

34 = 81

35 = 243

But, the number with L in the Alphabetical series is 343.

Hence, L343 is the wrong term in the series.

Question 135

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

In a certain code language 'books are many' is written as ym bs ae', 'many more students' is written as 'st em ym' and 'Students need books' is written as 'bs nd st'. Which code word represents 'are'?

  1. AOption (a)

    st

  2. BOption (b)

    nd

  3. COption (c)

    em

  4. DOption (d)

    ae

View answer & explanation

Correct answer

Answer: (d)D.

ae

Why this answer is correct

According to the question, the codes are as follows-

Here, Code "ae" is used for are.

Hence, the correct answer is "ae".

Question 136

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

In the following question assuming the given statements to be True, find which of the conclusion among given conclusions is/are definitely true and then give your answers accordingly.

Statement: P ≥ S = M > T ≤ J < N

Conclusions:

I. T < N

II. M > T

III. M > S

IV. S = T

  1. AOption (a)

    Only conclusion III is true

  2. BOption (b)

    Both conclusions I and II are true

  3. COption (c)

    Either conclusion I or II and III are true

  4. DOption (d)

    All are true

View answer & explanation

Correct answer

Answer: (b)B.

Both conclusions I and II are true

Why this answer is correct

Given statements: P ≥ S = M > T ≤ J < N

I. T < N → True (as T ≤ S < N)

II. M > T → True (as M > T)

III. M > S → False (as S = M)

IV. S = T → False (as S = M > T)

Hence, both conclusions I and II are true.

Question 137

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

Select the number that will come next in the given series.

702, 350, 174, 86, 42, ?

  1. AOption (a)

    15

  2. BOption (b)

    12

  3. COption (c)

    17

  4. DOption (d)

    20

View answer & explanation

Correct answer

Answer: (d)D.

20

Why this answer is correct

The pattern followed is,

Hence, “20” is the correct answer.

Question 138

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

Which of the answer figures is exactly the mirror image of the given figure, when the mirror is held on the line AB?

  1. AOption (a)

  2. BOption (b)

  3. COption (c)

  4. DOption (d)

View answer & explanation

Correct answer

Answer: (d)D.

Why this answer is correct

The mirror image of the given figure will be:

Hence, the above image will be the mirror image of the given figure.

Question 139

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

Choose the most appropriate option to complete the following series.

TMP, UKS, VIV, WGY, ___

  1. AOption (a)

    XEB

  2. BOption (b)

    XIB

  3. COption (c)

    XEA

  4. DOption (d)

    XHA

View answer & explanation

Correct answer

Answer: (a)A.

XEB

Why this answer is correct

The pattern is as follows:

  Hence, "XEB" is the correct answer.

Question 140

DSSSB Junior Assistant (LDC) 2025• Mental Ability & Reasoning 1

Given below are two statements and two conclusions. Choose the correct option based on them -

Statement:

  1. All puppets are dolls.
  2. All dolls are toys.

Conclusion:

  1. Some toys are puppets.
  2. All toys are puppets.
  1. AOption (a)

    Only conclusion 1 from the statements  is true.

  2. BOption (b)

    Only conclusion 2 from the statements is correct.

  3. COption (c)

    Both the conclusions from the statements are true.

  4. DOption (d)

    Neither conclusion 1 nor conclusion 2 is correct from the statements.

View answer & explanation

Correct answer

Answer: (a)A.

Only conclusion 1 from the statements  is true.

Why this answer is correct

Least Possible Venn diagram:

Conclusion:

  1. Some toys are puppets → Follows (Because all puppets are toys than some toys are puppets.Hence, it is definitely follows)
  2. All toys are puppets → Doesn't Follows (Here, some toys are puppet than all toys can not be puppet.So it does not follows)

Hence, only conclusion 1 from the statements is true.