Four persons can cross a bridge in 3,7,13,17 minut | Logic Questions & Answers

Q:

Directions:

A string of words is fed into a computing machine. It processes the input and gives an output in the following manner:

Input: Honesty is the best policy.

Step 1: is Honesty the best policy

Step 2: is the Honesty best policy

Step 3: is the best Honesty policy

Step 4: is the best policy Honesty

Output: is the best policy Honesty

Now,

If the input is "A rolling stone gathers no moss", what will be the fifth word in the string after 4 steps?

A) Moss	B) No
C) Stone	D) A

Answer & Explanation Answer: D) A

Explanation:

For the input "A rolling stone gathers no moss", the steps followed are:

Step 1: rolling A stone gathers no moss

Step 2: rolling stone A gathers no moss

Step 3: rolling stone gathers A no moss

Step 4: rolling stone gathers no A moss

After 4 steps the fifth word is "A".

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Q:

Between two book-ends in your study are displayed your four favourite love story books. If you decide to arrange the four books in every possible combination and moved just one book every minute, how long would it take you ?

A) 54 minutes	B) 32 minutes
C) 48 minutes	D) 24 minutes

Answer & Explanation Answer: C) 48 minutes

Explanation:

Possible arrangements for 4 books are 4x3x2x1 = 24
For making a new arrangement, two books are required to be moved.
One book takes one minute, then for 2 books
So total 24 x 2 = 48 mins.

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Q:

A man wears socks of two colours - Black and White. He has altogether 30 black socks and 10 brown socks in a drawer. Supposing he has to take out the socks in the dark, how many must he take out to be sure that he has a matching pair ?

A) 3	B) 4
C) 5	D) 2

Answer & Explanation Answer: A) 3

Explanation:

Given there are 2 coloured socks, which is black and White
Let suppose 3 is choosen at random
then three conditions arises
1. all are black
2.all are white
3. either it will have 2 black and 1 white or it will have 2 white and 1 black
so in all the conditions as above mentioned we are getting atleast one pair of socks.

So, he must take out 3 to be sure that he has a matching pair.

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Q:

a) In a family of 6 persons, there are two couples. b) The lawyer is the head of the family and has only two sons- Suresh and Rajesh- both teachers. c) Mrs. Veena and her mother-in-law both are lawyers. d) Suresh's wife is a Doctor and they have a son, Ankith.

1) What is the profession of Rajesh's wife ?

2) What is Ankith's grandfather's occupation ?

Answer

Answer: 1) Rajesh's wife is Mrs. Veena and she is a lawyer.

Answer: 2) The family doesn't have Ankith's grandfather.

So, we can't determine.

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Q:

M and N have children A and B.
F is spouse of B.
D is child of F.
P is son in law of N.
K is kid of P.

Who is male chiled of M and N ?

A) B	B) A
C) None	D) Can't be determined

Answer & Explanation Answer: A) B

Explanation:

Spouse means a person's partner in marriage, it can be male or female.
But given F is spouse of B
And P is Son in law of N
Relation between F and B
Relation between P and A only
and p is male So, A must be female
=> B is male child.

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Q:

One paper is equally folded 35 times, then what is the new thickness of the paper ?

A) T(2^50)	B) 50T
C) 2 x 50 T	D) T/50

Answer & Explanation Answer: A) T(2^50)

Explanation:

Let initial thickness of the paper be 'T'
after first fold it will be '2T' = $2^{1} T$
after second fold it will be '4T' = $2^{2} T$
after 50th fold it will be T x ( $2^{50}$ T)

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Q:

In an objective competitive exam, a correct answer score 4 marks and on a wrong answer 2 marks are negatively added. A student scores 420 marks from 150 question. How many answers were correct ?

A) 145	B) 138
C) 125	D) 120

Answer & Explanation Answer: D) 120

Explanation:

let x be the correct answer and y be the wrong answer
so the total number of questions is (x + y) = 150.....(1)
=> 4x - 2y = 420.....(2)
By solving (1) & (2), we get
=> 6x = 720
hence x = 120
Therefore, number of correct answers are 120.

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Q:

A group of six cousins are sitting around a hexagonal table, each one at one corner of the hexagon. (facing the centre inside) Raju is sitting opposite to Rohan. Sweety is sitting next to Navya. Aadya is sitting opposite to Navya, but not next to Kalyan. Karthik has a person sitting between Rohan and himself. If Sweety sits to the right of Karthik, then who is sitting to the left of Karthik ?

A) Aadya	B) Kalyan
C) Raju	D) Rohan

Answer & Explanation Answer: C) Raju

Explanation:

Suppose Sweety is sitting between Rohan and Karthik such that she is to the right of him.....then as Raju is opposite to Rohan then Raju must be to the left of Karthik.

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A) 17 minutes	B) 20 minutes
C) 34 minutes	D) 12 minutes

Four persons can cross a bridge in 3,7,13,17 minutes.Only two can cross at a time.Find the minimum time taken by the four to cross the bridge ?

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