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UPSC CSE Prelims 2019 — Logical Reasoning Questions with Answers
All 32 Logical Reasoning previous-year questions from UPSC CSE Prelims 2019, each with the correct answer and a full explanation. Practise them as a free, timed mock test with instant scoring.
Practice Logical Reasoning as a timed test →- Q1.Cubes and Dice
A solid cube is painted yellow, blue and black such that opposite faces are of same colour. The cube is then cut into 36 cubes of two different sizes such that 32 cubes are small and the other four cubes are big. None of the faces of the bigger cubes is painted blue. How many cubes have only one face painted?
- a)4
- b)6
- c)8
- d)10
- Q2.Calendar
Mr X has three children. The birthday of the first child falls on the 5th Monday of April, that of the second one falls on the 5th Thursday of November. On which day is the birthday of his third child, which falls on 20 December?
- a)Monday
- b)Thursday
- c)Saturday
- d)Sunday
- Q3.Syllogism
Consider the following Statements and Conclusions: Statements: 1. Some rats are cats. 2. Some cats are dogs. 3. No dog is a cow. Conclusions: I. No cow is a cat. II. No dog is a rat. III. Some cats are rats. Which of the above conclusions is/are drawn from the statements?
- a)I, II and III
- b)Only I
- c)Only III
- d)Only I and III
- Q4.Counting Figures
The number of parallelograms that can be formed from a set of four parallel lines intersecting another set of four parallel lines, is
- a)18
- b)24
- c)32
- d)36
- Q5.Ages
In 2002, Meenu's age was one-third of the age of Meera, whereas in 2010, Meenu's age was half the age of Meera. What is Meenu's year of birth?
- a)1992
- b)1994
- c)1996
- d)1998
- Q6.Set Theory
In a conference, out of a total 100 participants, 70 are Indians. If 60 of the total participants are vegetarian, then which of the following statements is/are correct? 1. At least 30 Indian participants are vegetarian. 2. At least 10 Indian participants are non-vegetarian. Select the correct answer using the codes given below:
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
- Q7.Logical Deduction
A five-storeyed building with floors from I to V is painted using four different colours and only one colour is used to paint a floor. Consider the following statements: 1. The middle three floors are painted in different colours. 2. The second (II) and the fourth (IV) floors are painted in different colours. 3. The first (I) and the fifth (V) floors are painted red. To ensure that any two consecutive floors have different colours
- a)Only statement 2 is sufficient
- b)Only statement 3 is sufficient
- c)Statement 1 is not sufficient, but statement 1 along with statement 2 is sufficient
- d)Statement 3 is not sufficient, but statement 3 along with statement 2 is sufficient
- Q8.Direction Sense
P, Q and R are three towns. The distance between P and Q is 60 km, whereas the distance between P and R is 80 km. Q is in the West of P and R is in the South of P. What is the distance between Q and R?
- a)140 km
- b)130 km
- c)110 km
- d)100 km
- Q9.Set Theory
All members of a club went to Mumbai and stayed in a hotel. On the first day, 80% went for shopping and 50% went for sightseeing, whereas 10% took rest in the hotel. Which of the following conclusion(s) can be drawn from the above data? 1. 40% members went for shopping as well as sightseeing. 2. 20% members went for only shopping. Select the correct answer using the code given below:
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
- Q10.Logical Deduction
In a school, 60% students play cricket. A student who does not play cricket, plays football. Every football player has got a two-wheeler. Which of the following conclusions cannot be drawn from the above data? 1. 60% of the students do not have two-wheelers. 2. No cricketer has a two-wheeler. 3. Cricket players do not play football. Select the correct answer using the code given below:
- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
- Q11.LCM and Cycles
Seeta and Geeta go for a swim after a gap of every 2 days and every 3 days respectively. If on 1st January both of them went for a swim together, when will they go together next?
- a)7 January
- b)8 January
- c)12 January
- d)13 January
- Q12.Ages
Ena was born 4 years after her parents' marriage. Her mother is three years younger than her father and 24 years older than Ena, who is 13 years old. At what age did Ena's father get married?
- a)22 years
- b)23 years
- c)24 years
- d)25 years
- Q13.Number Series
What is X in the sequence 132, 129, 124, 117, 106, 93, X?
- a)74
- b)75
- c)76
- d)77
- Q14.Clocks
A wall clock moves 10 minutes fast in every 24 hours. The clock was set right to show the correct time at 8:00 a.m. on Monday. When the clock shows the time 6:00 p.m. on Wednesday, what is the correct time?
- a)5:36 p.m.
- b)5:30 p.m.
- c)5:24 p.m.
- d)5:18 p.m.
- Q15.Number Series
What is X in the sequence 4, 196, 16, 144, 36, 100, 64, X?
- a)48
- b)64
- c)125
- d)256
- Q16.Set Theory
In a group of 15 people, 7 can read French, 8 can read English while 3 of them can read neither of these two languages. The number of people who can read exactly one language is
- a)10
- b)9
- c)5
- d)4
- Q17.Letter Series
Consider the following sequence that follows some arrangement: c_accaa_aa_bc_b The letters that appear in the gaps are
- a)abba
- b)cbbb
- c)bbbb
- d)cccc
- Q18.Permutation Combination
Suppose you have sufficient amount of rupee currency in three denominations: Rs 1, Rs 10 and Rs 50. In how many different ways can you pay a bill of Rs 107?
- a)16
- b)17
- c)18
- d)19
- Q19.Direction Sense
'A' started from his house and walked 20 m towards East, where his friend 'B' joined him. They together walked 10 m in the same direction. Then 'A' turned left while 'B' turned right and travelled 2 m and 8 m respectively. Again 'B' turned left to travel 4 m followed by 5 m to his right to reach his office. 'A' turned right and travelled 12 m to reach his office. What is the shortest distance between the two offices?
- a)15 m
- b)17 m
- c)19 m
- d)20 m
- Q20.Number System
Consider two statements S1 and S2 followed by a question: S1: p and q both are prime numbers. S2: p+q is an odd integer. Question: Is pq an odd integer? Which one of the following is correct?
- a)S1 alone is sufficient to answer the question
- b)S2 alone is sufficient to answer the question
- c)Both S1 and S2 taken together are not sufficient to answer the question
- d)Both S1 and S2 are necessary to answer the question
- Q21.Calendar
Which year has the same calendar as that of 2009?
- a)2018
- b)2017
- c)2016
- d)2015
- Q22.Coding-Decoding
If every alternative letter of the English alphabet from B onwards (including B) is written in lower case (small letters) and the remaining letters are capitalized, then how is the first month of the second half of the year written?
- a)JuLY
- b)jULy
- c)jUly
- d)jUlY
- Q23.Number Series
In the sequence 1, 5, 7, 8, 5, 7, 4, 8, 5, 7, how many such 5s are there which are not immediately preceded by 3 but are immediately followed by 7?
- a)1
- b)2
- c)3
- d)None
- Q24.Blood Relations
A joint family consists of seven members A, B, C, D, E, F and G with three females. G is a widow and sister-in-law of D's father F. B and D are siblings and A is daughter of B. C is cousin of B. Who is E? 1. Wife of F 2. Grandmother of A 3. Aunt of C Select the correct answer using the code given below:
- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
- Q25.Cubes and Dice
Each face of a cube can be painted in black or white colours. In how many different ways can the cube be painted?
- a)9
- b)10
- c)11
- d)12
- Q26.Permutation Combination
How many triplets (x, y, z) satisfy the equation x + y + z = 6, where x, y and z are natural numbers?
- a)4
- b)5
- c)9
- d)10
- Q27.Symbol Substitution
If $ means 'divided by'; @ means 'multiplied by'; # means 'minus', then the value of 10 # 5 @ 1 $ 5 is
- a)0
- b)1
- c)2
- d)9
- Q28.Ranking and Ordering
Read the following information and answer the item that follows: Six students A, B, C, D, E and F appeared in several tests. Either C or F scores the highest. Whenever C scores the highest, then E scores the least. Whenever F scores the highest, B scores the least. In all the tests they got different marks; D scores higher than A, but they are close competitors; A scores higher than B; C scores higher than A. If F stands second in the ranking, then the position of B is
- a)Third
- b)Fourth
- c)Fifth
- d)Sixth
- Q29.Ranking and Ordering
Read the following information and answer the item that follows: Six students A, B, C, D, E and F appeared in several tests. Either C or F scores the highest. Whenever C scores the highest, then E scores the least. Whenever F scores the highest, B scores the least. In all the tests they got different marks; D scores higher than A, but they are close competitors; A scores higher than B; C scores higher than A. If B scores the least, the rank of C will be
- a)Second
- b)Third
- c)Fourth
- d)Second or third
- Q30.Ranking and Ordering
Read the following information and answer the item that follows: Six students A, B, C, D, E and F appeared in several tests. Either C or F scores the highest. Whenever C scores the highest, then E scores the least. Whenever F scores the highest, B scores the least. In all the tests they got different marks; D scores higher than A, but they are close competitors; A scores higher than B; C scores higher than A. If E is ranked third, then which one of the following is correct?
- a)E gets more marks than C
- b)C gets more marks than E
- c)A is ranked fourth
- d)D is ranked fifth
- Q31.Logical Deduction
Read the following statements S1 and S2 and answer the item that follows: S1: Twice the weight of Sohan is less than the weight of Mohan or that of Rohan. S2: Twice the weight of Rohan is greater than the weight of Mohan or that of Sohan. Which one of the following statements is correct?
- a)Weight of Mohan is greatest
- b)Weight of Sohan is greatest
- c)Weight of Rohan is greatest
- d)'Whose weight is greatest' cannot be determined
- Q32.Logical Deduction
Read the following statements S1 and S2 and answer the item that follows: S1: Twice the weight of Sohan is less than the weight of Mohan or that of Rohan. S2: Twice the weight of Rohan is greater than the weight of Mohan or that of Sohan. Which one of the following statements is correct?
- a)Weight of Mohan is least
- b)Weight of Sohan is least
- c)Weight of Rohan is least
- d)'Whose weight is least' cannot be determined
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