UPSC 2019 CSAT Previous Year Questions

Question 1

Read the following statements S1 and S2: 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?

Accepted Answer

Correct Option: B. Weight of Mohan is least | Weight of Sohan is least | Weight of Rohan is least | 'Whose weight is least' cannot be determined. Weight of Sohan is least. Convert the given information into a small table, equation set, sequence pattern or truth condition according to the question. Then test each option against every stated condition. Option B is the keyed answer because it is the only choice that follows from the complete condition set without adding an unstated assumption.

Question 2

Read the following statements S1 and S2: 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?

Accepted Answer

Correct Option: D. Weight of Mohan is greatest | Weight of Sohan is greatest | Weight of Rohan is greatest | 'Whose weight is greatest' cannot be determined. 'Whose weight is greatest' cannot be determined. Convert the given information into a small table, equation set, sequence pattern or truth condition according to the question. Then test each option against every stated condition. Option D is the keyed answer because it is the only choice that follows from the complete condition set without

Question 3

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?

Accepted Answer

Correct Option: B. E gets more marks than C | C gets more marks than E | A is ranked fourth | D is ranked fifth. Applying the stated conditions step by step leaves option B: C gets more marks than E. The other options conflict with at least one given condition or require an unsupported assumption.

Question 4

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

Accepted Answer

Correct Option: D. Second | Third | Fourth | Second or third. Applying the stated conditions step by step leaves option D: Second or third. The other options conflict with at least one given condition or require an unsupported assumption.

Question 5

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:

Accepted Answer

Correct Option: C. Third | Fourth | Fifth | Sixth. Applying the stated conditions step by step leaves option C: Fifth. The other options conflict with at least one given condition or require an unsupported assumption.

Question 6

An 8-digit number 42527463 leaves remainder 0 when divided by 3. How manv values of B are possible?

Accepted Answer

Correct Option: B. 2 | 3 | 4 | 6. 3. The intended number is 42527B63. A number is divisible by 3 when its digit sum is divisible by 3. The fixed digit sum is 4+2+5+2+7+6+3 = 29. Thus 29+B must be divisible by 3. Possible digit values are B=1,4,7. Therefore 3 values are possible.

Question 7

If $ means 'divided by'; @ means 'multiplied by'; # means 'minus', then the value of 10#5@1$5 is:

Accepted Answer

Correct Option: D. 0 | 1 | 2 | 9. 9. Replace symbols: $ means division, @ means multiplication and # means minus. So 10#5@1$5 becomes 10 - 5 x 1 / 5. Apply multiplication/division before subtraction: 5 x 1 / 5 = 1. Therefore value = 10 - 1 = 9.

Question 8

How many triplets (x, y, z) satisfy the equation x + y + z = 6, where x, y and z are natural numbers?

Accepted Answer

Correct Option: D. 4 | 5 | 9 | 10. 10. Since x, y and z are natural numbers, each is at least 1. Put x'=x-1, y'=y-1, z'=z-1. Then x'+y'+z'=3, where x', y', z' are non-negative integers. Number of solutions = C(3+3-1,3-1)=C(5,2)=10.

Question 9

Each face of a cube can be painted in black or white colours. In how many different ways can the cube be painted?

Accepted Answer

Correct Option: B. 9 | 10 | 11 | 12. The keyed answer is B: 10. Treat the answer choices as testable values. Substitute each option into the given conditions and reject any value that violates even one condition. Option B is the one that remains consistent with the complete set of conditions.

Question 10

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:

Accepted Answer

Correct Option: D. 1 and 2 only | 2 and 3 only | 1 and 3 only | 1, 2 and. The keyed answer is D: 1, 2 and 3. Decode the symbol or letter rule carefully, apply it in the same order, and avoid reversing the relationship. Option D is retained because it is consistent with the complete condition set; the other options fail at least one stated condition or draw a conclusion that is not forced.

UPSC 2019 CSAT Question 1

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UPSC 2019 CSAT Question 6

UPSC 2019 CSAT Question 7

UPSC 2019 CSAT Question 8

UPSC 2019 CSAT Question 9

UPSC 2019 CSAT Question 10

CSAT — UPSC 2019