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Names of Person: Manoj, Mani, Mohan, Manu, Manju, Meena, Madhu and Mahesh.

Facing direction: All of them are facing North.

1. Four people are sitting between Manju and Manu, but neither of them is sitting at any extreme ends of the row. 

(Here two cases exists, Case - 1: Manu sits to the right of Manoj and four people sit between them. Case - 2: Manu sits to the left of Manju and four people sit between them.)

2. Two people are sitting between Manju and Mohan, who is sitting to the immediate right of Meena.

3. Only one person is sitting between Meena and Madhu, who is not sitting at any extreme ends of the row.

4. Mani is sitting exactly in the middle of Mohan and Manoj.

5. Madhu is sitting second to the left of Mahesh.

(Here Case - 2 gets eliminated, as Madhu can not be placed second to the left of Mahesh.)

Hence, Manoj is sitting to the immediate left of Manju.

Names of Person: Manoj, Mani, Mohan, Manu, Manju, Meena, Madhu and Mahesh.

Facing direction: All of them are facing North.

1. Four people are sitting between Manju and Manu, but neither of them is sitting at any extreme ends of the row. 

(Here two cases exists, Case - 1: Manu sits to the right of Manoj and four people sit between them. Case - 2: Manu sits to the left of Manju and four people sit between them.)

2. Two people are sitting between Manju and Mohan, who is sitting to the immediate right of Meena.

3. Only one person is sitting between Meena and Madhu, who is not sitting at any extreme ends of the row.

4. Mani is sitting exactly in the middle of Mohan and Manoj.

5. Madhu is sitting second to the left of Mahesh.

(Here Case - 2 gets eliminated, as Madhu can not be placed second to the left of Mahesh.)

Hence, Mani is sitting second to the left of Mohan.

Names of Person: Manoj, Mani, Mohan, Manu, Manju, Meena, Madhu and Mahesh.

Facing direction: All of them are facing North.

1. Four people are sitting between Manju and Manu, but neither of them is sitting at any extreme ends of the row. 

(Here two cases exists, Case - 1: Manu sits to the right of Manoj and four people sit between them. Case - 2: Manu sits to the left of Manju and four people sit between them.)

2. Two people are sitting between Manju and Mohan, who is sitting to the immediate right of Meena.

3. Only one person is sitting between Meena and Madhu, who is not sitting at any extreme ends of the row.

4. Mani is sitting exactly in the middle of Mohan and Manoj.

5. Madhu is sitting second to the left of Mahesh.

(Here Case - 2 gets eliminated, as Madhu can not be placed second to the left of Mahesh.)

Hence, Madhu and Mahesh are the immediate neighbours of Manu.

Names of Person: Manoj, Mani, Mohan, Manu, Manju, Meena, Madhu and Mahesh.

Facing direction: All of them are facing North.

1. Four people are sitting between Manju and Manu, but neither of them is sitting at any extreme ends of the row. 

(Here two cases exists, Case - 1: Manu sits to the right of Manoj and four people sit between them. Case - 2: Manu sits to the left of Manju and four people sit between them.)

2. Two people are sitting between Manju and Mohan, who is sitting to the immediate right of Meena.

3. Only one person is sitting between Meena and Madhu, who is not sitting at any extreme ends of the row.

4. Mani is sitting exactly in the middle of Mohan and Manoj.

5. Madhu is sitting second to the left of Mahesh.

(Here Case - 2 gets eliminated, as Madhu can not be placed second to the left of Mahesh.)

Hence, Meena is sitting exactly between Mani and Mohan.

Given statements: P ≥ Q ≥ R = S; U ≤ V ≤ S

On combining: P ≥ Q ≥ R = S ≥ V ≥ U

Conclusions:

I. P ≤ U → False (On combining the statements we get P ≥ U Hence, P ≤ U is definitely false  and will not follow)

II. P > U → False ( On combining the statements we get P ≥ U. Hence, P > U is false as it cannot be definitely said and thus will not follow)

Therefore, Neither I nor II is true. 

Mistake Points

After combining the statements, we get P ≥ U which means two cases

either P > U or P = U, we eliminate the second conclusion because of this uncertainty. And this 'either-or' case is different from the given option's 'either-or'.

Given Statements: P > Q ≥ R < S; V > U < T ≥ S

On combining: P > Q ≥ R < S ≤ T > U < V

Conclusions:

I. T > R → True (as P > Q ≥ R < S ≤ T → R < T)

 II. T < P → False (as P > Q ≥ R < S ≤ T, no relation is definite)

Hence, only I is true.

Given statements: R < L = N > P ≤ Q > S = M

Conclusions:

I. P = Q → False (as P ≤ Q)

II. P < Q → False (as P ≤ Q)

Therefore conclusion I and II forms a complementary pair.

Hence, either I or II is true.

Statements: M ≥ Q ≥ R = F = T ≥ U ≤ V ≤ D = G

Conclusions:

I. D > F → False (F = T ≥ U ≤ V ≤ D → F ≥ U ≤ D, thus clear relationship between D and F cannot be determined)

II.U ≤ R → True (R = F = T ≥ U → R ≥ U)

Thus only conclusion II follows.

Given word: AUTHORISE

Replacing the consonants with the succeeding letter and vowel with their preceding letter, we get

Hence, I is third letter from the left end.

From the given information

Hence there are five pairs in the word ‘ CELLPHONES ’.