Infosys Logical Reasoning Questions And Answers
Infosys Logical Reasoning Ability MCQs : This section focuses on "Logical Reasoning" of Infosys Exam. These Logical Reasoning MCQs are asked in previous Infosys Recruitment Exams & drives for freshers and will help you to prepare for upcoming exams and recruitment drives.
1. Ramesh speaks truth only in the morning and lies in the afternoon, whereas Suresh speaks truth only in the afternoon. A says that B is Ramesh Is it morning or afternoon and who is A - Ramesh or Suresh.
A. Afternoon.A is Salman
B. Afternoon.B is Shahrukh
C. Afternoon.A is Shahrukh
D. None
View Answer
Ans : A
Explanation: Answer is ofcourse Afternoon, but A can be either Shahrukh or Salman. Here is the complete solution:
A says B is Shahrukh.
Assume it is morning,
Case I: A is actually Shahrukh. He always speaks truth in morning. NOT POSSIBLE.
Case II: A is actually Salman. He always lies in morning. NOT POSSIBLE
Assume it is afternoon,
Case I: A is actually Shahrukh. He always lies in the afternoon and thus says B is Shahrukh. POSSIBLE.
Case II: A is actually Salman. He always speaks truth in the afternoon. POSSIBLE.
Therefore, it is afternoon and A can be either Shahrukh or Salman
2. All birds are animals.
All animals are four legged.
Implications:
a. All animals which are four legged are birds.
b. All birds are four legged
c. Some birds not are four legged
d. Some birds are animals but not four legged
A. a and b
B. b and c
C. only b
D. only d
View Answer
Ans : B
Explanation: a. All animals which are four legged are birds. (False as it is not definite)
b. All birds are four legged (Clearly true as it is definite)
c. Some birds are not four legged (False as it is not definite)
d. Some birds are animals but not four legged (False as it is not definite also if all statements are positive then conclusion can never be negative)
3. One quarter of the time till now from midnight and half of the time remaining from now up to midnight adds to the present time. What is the present time?
A. 9:38
B. 9:56
C. 9:36
D. 9:16
View Answer
Ans : C
Explanation: x is present time
1/4(x)+1/2(24-x)=x
solve it then x = 9:36
4. In a certain code, COMPUTER is written as RFUVQNPC. How is MEDICINE written in the same code ?
A. EOJDJEFM
B. EOJDEJFM
C. MFEJDJOE
D. MFEDJJOE
View Answer
Ans : D
Explanation: There are 8 letters in the word.
The coded word can be obtained by taking the immediately following letters of word, expect the first and the last letters of the given word but in the reverse order. That means, in the coded form the first and the last letters have been interchanged while the remaining letters are coded by taking their immediate next letters in the reverse order.
5. 8, 11, 21, 15, 18, 21, 22, ?
choose which pair of numbers comes next?
A. 25, 18
B. 25, 21
C. 25, 29
D. 24, 21
View Answer
Ans : B
Explanation: This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3
6. What is the angle between two hands when time is 5:30?
A. 15 degree
B. 20 degree
C. 30 degree
D. 45 degree
View Answer
Ans : A
Explanation: At 5:30 minute hand will be at position 6 and hour hand will be exactly between
5 and 6 and will cover 15°, so angle between two hands=30 -15 = 15°
7. What is the value of y?
1. y - 3 = 2
2. y^2= 25
A. 2
B. 3
C. 4
D. 5
View Answer
Ans : D
Explanation: since y - 3 = 2,
from 1st we get y = 5 and
since 2nd statement y^2 = 25
∴ we get y = 5
both the statement are alone sufficient
8. Directions: Each question below has two statements following it. Decide if the statement suffices to answer the question. Choices are:
If a = 5, what is value of b + c?
I) a is the average of the set {a, b, c}
II) ab + ac = 10
A. If only I is sufficient
B. If only II is sufficient
C. If both are required
D. If each can answer independently
View Answer
Ans : B
Explanation: Sufficient. This statement tells us that (a + b + c)/3 = 5, which means that a + b + c = 15. We know that a = 5, so b + c must equal 10.
Sufficient. Knowing that a = 5, this statement tells us that 5b + 5c = 10. Divide both sides by 5 to find that b + c = 2.
9. Look at this series: 2, 6, 18, 54, ?.
What number should come next?
A. 108
B. 148
C. 162
D. 216
View Answer
Ans : C
Explanation: Since 2*3=6, 6*3=18, 18*3=54.
so 54*3=162.
Therefore next number is 162.
10. In a certain code, 15789 is written as AXBTC, 2346 is written as MPDU. How is 23549 written in that code?
A. MPXDT
B. MPADC
C. MPXCD
D. MPXDC
View Answer
Ans : D
Explanation: The numbers are coded as shown:
1 5 7 8 9 2 3 4 6
A X B T C M P D U
i.e., 2 as M,
3 as P,
5 as X,
4 as D and
9 as C.
So, 23549 is coded as MPXDC.
11. A says either Democratic or liberal wins the elections. B says Democratic wins. C says neither democratic nor liberal wins the election. Of these only one is wrong. Who wins the election?
A. Democratic
B. Liberal
C. Both democratic and liberal
D. None of them
View Answer
Ans : A
Explanation: Assume democratic wins the elections, then A and B are right and C is wrong which satisfies the condition. Assume Liberal wins the elections, then only A is right and the condition is not satisfied. Thus Democratic wins the elections.
12. There are 6561 number of balls in a bag. Out of which one is heavy ball. In how many minimum number of weighing can you find the heavy ball?
A. 9
B. 8
C. 2
D. 7
View Answer
Ans : B
Explanation: Arithmetically it'll be solved in 8 minimum weighings.
13. All men are vertebrates.
Some mammals are vertebrates.
Which of the following conclusions given in the options are drawn from the above statement is correct?
A. All men are mammals
B. All mammals are men
C. Some vertebrates are mammals.
D. All are correct
View Answer
Ans : C
Explanation: From the given conclusions only ‘Some vertebrates are mammals’ is true as it is definite but the other are not definite.
14. If in a certain language if ENTRY is coded as 12345 and STEADY is coded as 931785, then state which is the correct code for below word. NEATNESS
A. 25196577
B. 21732199
C. 21362199
D. 21823698
View Answer
Ans : B
Explanation: NEATNESS- 21732199
15. In a certain code, 15789 is written as AXBTC, 2346 is written as MPDU. How is 23549 written in that code ?
A. MPXDT
B. MPADC
C. MPXCD
D. MPXDC
View Answer
Ans : D
Explanation: 2 3 5 4 9 = M P X D C
16. What is the 8th term in the series 1, 4, 9, 18, 35, 68, . . .
A. 262
B. 148
C. 342
D. 112
View Answer
Ans : A
Explanation: 2^8+6 = 262. So, eighth term so answer is 262
17. Look at this series: F2, __, D8, C16, B32, ... What number should fill the blank?
A. A16
B. G4
C. E4
D. E3
View Answer
Ans : C
Explanation: The letters decrease by 1; the numbers are multiplied by 2. Hence, E4
18. GO+TO=OUT, O+U+T=?
A. 10
B. 8
C. 5
D. 3
View Answer
Ans : D
Explanation: Now O + U + T = 1 + 0 + 2 = 3
19. What is the angle between two hands when time is 5:30?
A. 20 Degrees
B. 18.75 Degrees
C. 160 Degrees
D. 15 Degrees
View Answer
Ans : D
Explanation: At 5:30 minute hand will be at position 6 and hour hand will be exactly between 5 and 6 and will cover 15°, so angle between two hands=30 -15 = 15°
20. Is the product of x and y greater than 60?
1. The sum of x and y is greater than 60.
2. Each of the variables is greater than 2.
A. Statement 1 alone is sufficient but statement 2 alone is not sufficient to answer the question
B. Statement 2 alone is sufficient but statement 1 alone is not sufficient to answer the question
C. Both statements 1 and 2 together are sufficient to answer the question but neither statement is sufficient
D. Each statement alone is sufficient to answer the
View Answer
Ans : C
Explanation: Both statements 1 and 2 together are sufficient to answer the question but neither statement is sufficient
Discussion