CSAT › Logical Reasoning – UPSC Prelims PYQs

A cuboid has six sides of different colours. The red side is opposite to black. The blue side is adjacent to white. The brown side is adjacent to blue. The red side is face down.

Which one of the following would be the opposite to brown?

Six books A, B, C, D, E and F are placed side by side. B, C and E have blue cover and the other books have red cover. Only D and F are new books and the rest are old. A, C and D are law reports and others are Gazetters. What book is a new law report with a red colour?

Six persons M, N, O, P, Q and R are sitting in two rows, three in each. Q is not at the end of any row. P is second to the left of R. O is the neighbour of Q and is sitting diagonally opposite to P. N is the neighbour of R. On the basis of above information, who is facing N?

In a group of five persons A, B, C, D and E, there is a professor, a doctor and a lawyer. A and D are unmarried ladies, and do not work. Of the married couple in the group, E is the husband. B is the brother of A and is neither a doctor nor a lawyer. Who is the professor?

Half of the villagers of a certain village have their own houses. One-fifth of the villagers cultivate paddy. One-third of the villagers are literate. Four-fifth of the villagers are below twenty-five. Then, which one of the following is certainly true?

P, Q, R and S are four men. P is the oldest but not the poorest. R is the richest but not the oldest. Q is older than S but not than P or R. P is richer than Q but not than S. The four men can be ordered (descending) in respect of age and richness, respectively, as

In a meeting, the map of a village was placed in such a manner that south-east becomes north, north-east becomes west and so on. What will south become?

Examine the following statements :

1. All colours are pleasant.
2. Some colours are pleasant.
3. No colour is pleasant.
4. Some colours are not pleasant. Given that the statement 4 is true, what can be definitely concluded ?

A person travels 12 km due North, then 15 km due East, after that 15 km due West and then 18 km due South. How far is he from the starting point ?

Six persons A, B, C, D, E and F are standing in a row. C and D are standing close to each other alongside E. B is standing beside A only. A is fourth from F. Who are standing on the extremes ?

How many letters of the English alphabet (capitals) appear same when looked at in a mirror?

There is a family of 6 persons A, B, C, D, E and F. There are two married couples in the family. The family members are lawyer, teacher, salesman, engineer, accountant and doctor. D, the salesman is married to the lady teacher. The doctor is married to the lawyer. F, the accountant is the son of B and brother of E. C, the lawyer is the daughter-in-law of A. E is the unmarried engineer. A is the grandmother of F. How is E related to F?

There are three cans A, B and

1. It is possible to have 6 litres of milk each in can A and can B.
2. It is possible to have 8 litres of milk each in can B and can C.

C. The capacities of A, B and C are 6 litres, 10 litres and 16 litres respectively. The can C contains 16 litres of milk. The milk has to be divided in them using these three cans only. Consider the following statements :

Which of the statements given above is/are correct ?

In the series AABABCABCDABCDE... which letter occupies the 100th position?

How many different triangles are there in the figure shown above?

Six faces of a cube are numbered from 1 to 6, each face carrying one different number. Further,

1. The face 2 is opposite to the face 6.
2. The face 1 is opposite to the face 5.
3. The face 3 is between the face 1 and face 5.
4. The face 4 is adjacent to the face 2.

Which one of the following is correct?

P, Q, R, S and T reside in a 5-storeyed (Ground + 4) building, and each of them resides on a separate floor. Further,

1. T does not reside on the topmost floor.
2. Q does not reside on the ground floor.
3. S resides on one storey above that of P and one storey below that of R. To know as to which of the 5 persons resides on the ground floor which of the above statements are sufficient / insufficient?

Refer to the three figures I, II and III in which numbers are arranged in squares. What is the value of X in figure III?

Each of the six faces of a cube is numbered by one of the six digits from 1 to 6. This cube is shown in its four different positions in the figures I, II, III and IV. Consider the following statements:

1. Figures II and III are sufficient to know as to which face is opposite to the face numbered 6.
2. Figures II and III are sufficient to know as to which face is opposite to the face numbered 4.
3. Figures I and IV are sufficient to know as to which face is opposite to the face numbered 4.

Which of the statements given above are correct? The original figure is not available for this question.

In an office, the number of persons who take tea is twice the number of persons who take only coffee. The number of persons who take coffee is twice the number of persons who take only tea. Consider the following statements:

1. The sum of the number of persons who take either tea or coffee or both is four times the number of persons who take both coffee and tea.
2. The sum of the number of persons who take only coffee and those who take only tea is twice the number of persons who take both coffee and tea.

Which of the statements given above is/are correct?

Which is Krishnan’s hometown?

Which College is situated in Inder’s hometown?

Who studies in Bhopal?

If Inder studies in Ahmedabad, then

which one of the following is the correct combination of Person–Hometown–Place of Study?

The magazine on science is published by

The magazine on sports is

The magazine on films is

The magazine on politics is

Most guitarists are bearded males. If A represents all males, B represents bearded males and C represents all male guitarists, then the correct diagram for their relation (shaded portion) is

Anand must be a vegetarian because he is a Buddhist. The argument assumes that

Consider the following pictures of a dice: What is the number opposite of 3?

Examine the following relationships among members of a family of six persons A, B, C, D, E and F. I. The number of males equals that of females. II. A and E are sons of F. III. D is the mother of two, one boy and one girl. IV. B is the son of A. V. There is only one married couple in the family at present.

Which one of the following inferences can be drawn from the above?

In a certain code, MARCH is written as OCTEJ. How is RETURN written in that code?

A, B, C, D, E and F, not necessarily in that order, are sitting in six chairs regularly placed around a round table. It is observed that A is between D and F. C is opposite D. D and E are not on neighbouring chairs.

Which one of the following must be true?

A person starts from a point A and travels 3 km eastwards to B and then turns left and travels thrice that distance to reach C. He again turns left and travels five times the distance he covered between A and B and reaches his destination D. The shortest distance between the starting point and destination is

On another planet, the local terminology for earth, water, light, air and sky are ‘sky’, ‘light’, ‘air’, ‘water’ and ‘earth’ respectively. If someone is thirsty there, what would he drink?

In a code language, ‘SOLID’ is written as “WPSLIMFHA’. What does the code word ‘ATEXXQIBVO’ refer to?

In a group of five people—K, L and M are ambitious; M, N and R are honest; L, M and N are intelligent and K, N and R are industrious. Among these, neither industrious nor ambitious person(s) would include

Examine the following three statements: I. Processed meat is a perishable food.

II. All perishable foods are packed in sealed tins. III. Sealed tins sometimes do not contain processed meat.

Which one of the following inferences can be drawn from the above statements?

Which one of the following satisfies the relationship D d a : a D D :: R r b : ?

A, B, C, D, E and F, not necessarily in that order, are sitting on six chairs regularly placed around a round table. It is observed that A is between D and F, C is opposite D, and D and E are not on neighbouring chairs.

Which one of the following pairs must be sitting on neighbouring chairs?

If in a certain code SAND is VDQG and BIRD is ELUG, then what is the code for LOVE?

The missing fraction in the series given below is:

In the set of figures (I) to (IV), some parts are shown to change their position in a regular direction. Following the same sequence, which one of the following will appear at the fifth stage?

Examine the following statements:

I. All members of Mohan’s family are honest. II. Some members of Mohan’s family are not employed. III. Some employed persons are not honest. IV. Some honest persons are not employed.

Which of the following inferences can be drawn from the above statements?

In a dinner party both fish and meat were served. Some took only fish and some only meat. There were some vegetarians who did not accept either. The rest accepted both fish and meat.

Which one of the following logic diagrams correctly reflects the above situation?

A, B, C, D, E, F and G are members of a family consisting of 4 adults and 3 children, two of whom, F and G, are girls. A and D are brothers and A is a doctor. E is an engineer married to one of the brothers and has two children. B is married to D and G is their child. Who is C?

In the series POQ, SRT, VUW, ?, the blank space refers to

Seven persons P, Q, R, S, T, U and V participate in and finish all the events of a series of swimming races. There are no ties at the finish of any of the events. V always finishes somewhere ahead of P. P always finishes somewhere ahead of Q. Either R finishes first and T finishes last or S finishes first and U or Q finishes last. If in a particular race V finished fifth, then which one of the following would be true?

Consider the following:

I. Saxena, David, Jain and Kumar were District Collectors at places P, Q, R and S respectively in 1970. II. In 1972 they were transferred. Saxena and Jain interchanged places. Kumar and David also interchanged places. III. One year later in 1973 they were again transferred such that David and Jain interchanged places and Saxena and Kumar were also interchanged. What should be the next round of transfers so that all the four persons could have been posted at all the four places?