UPSC Prelims 2024 Question Paper & Analysis
Get UPSC Prelims Previous Year Question (PYQ) Papers with detailed explanations, mindmaps, organized year-wise and subject-wise for CSAT.
PYQs with Detailed Answers
- View Answer for: Consider the following statements in respect of the sum $S = x + y + z$, where $x$, $y$ and $z$ are distinct prime numbers each less than 10: The unit digit of $S$ can be 0. The unit digit of $S$ can be 9. The unit digit of $S$ can be 5.Which of the statements given above are correct?
Consider the following statements in respect of the sum , where , and are distinct prime numbers each less than 10:
- The unit digit of can be 0.
- The unit digit of can be 9.
- The unit digit of can be 5.
Which of the statements given above are correct?
- View Answer for: On January 1st, 2023, a person saved Rs $1$. On January 2nd, 2023, he saved Rs. $2$ more than that on the previous day. On January 3rd, 2023, he saved Rs. $2$ more than that on the previous day and so on. At the end of which date was his total savings a perfect square as well a perfect cube?
On January 1st, 2023, a person saved Rs . On January 2nd, 2023, he saved Rs. more than that on the previous day. On January 3rd, 2023, he saved Rs. more than that on the previous day and so on. At the end of which date was his total savings a perfect square as well a perfect cube?
- View Answer for: How many consecutive zeros are there at the end of the integer obtained in the product $1^2 \times 2^4 \times 3^6 \times 4^8 \times.... \times 25^{50}$?
How many consecutive zeros are there at the end of the integer obtained in the product ?
- View Answer for: Let p, q, r and s be distinct positive integers. Let p, q be odd and r, s be even. Consider the following statements: $(p-r)^{2^{qs}}$ is even. $(q-s)^{q^{2s}}$ is even. $(q + r)^{2^{p + s}}$ is odd.Which of the statements given above are correct?
Let p, q, r and s be distinct positive integers. Let p, q be odd and r, s be even. Consider the following statements:
- is even.
- is even.
- is odd.
Which of the statements given above are correct?
- View Answer for: If the sum of the two-digit numbers AB and CD is the three-digit number 1CE, where the letters A, B, C, D, E denote distinct digits, then what is the value of A?
If the sum of the two-digit numbers AB and CD is the three-digit number 1CE, where the letters A, B, C, D, E denote distinct digits, then what is the value of A?
- View Answer for: Three numbers $x$, $y$, $z$ are selected from the set of the first seven natural numbers such that $x > 2y > 3z$. How many such distinct triplets $(x, y, z)$ are possible?
Three numbers , , are selected from the set of the first seven natural numbers such that . How many such distinct triplets are possible?
- View Answer for: What is the number of fives used in numbering a 260-page book?
What is the number of fives used in numbering a 260-page book?
- View Answer for: A can X contains 399 litres of petrol and a can Y contains 532 litres of diesel. They are to be bottled in bottles of equal size so that whole of petrol and diesel would be separately bottled. The bottle capacity in terms of litres is an integer. How many different bottle sizes are possible?
A can X contains 399 litres of petrol and a can Y contains 532 litres of diesel. They are to be bottled in bottles of equal size so that whole of petrol and diesel would be separately bottled. The bottle capacity in terms of litres is an integer. How many different bottle sizes are possible?
- View Answer for: What percent of water must be mixed with honey so as to gain 20% by selling the mixture at the cost price of honey ?
What percent of water must be mixed with honey so as to gain 20% by selling the mixture at the cost price of honey ?
- View Answer for: A person buys three articles P, Q and R for ₹ 3,330. If P costs 25% more than R and R costs 20% more than Q, then what is the cost of P?
A person buys three articles P, Q and R for ₹ 3,330. If P costs 25% more than R and R costs 20% more than Q, then what is the cost of P?
- View Answer for: Two persons P and Q enter into a business. P puts ₹ $14,000$ more than Q, but P has invested for $8$ months and Q has invested for $10$ months. If P's share is ₹ $400$ more than Q's share out of the total profit of ₹ $2,000$, what is the capital contributed by P?
Two persons P and Q enter into a business. P puts ₹ more than Q, but P has invested for months and Q has invested for months. If P's share is ₹ more than Q's share out of the total profit of ₹ , what is the capital contributed by P?
- View Answer for: X, Y and Z can complete a piece of work individually in 6 hours, 8 hours and 8 hours respectively. However, only one person at a time can work in each hour and nobody can work for two consecutive hours. All are engaged to finish the work. What is the minimum amount of time that they will take to finish the work.
X, Y and Z can complete a piece of work individually in 6 hours, 8 hours and 8 hours respectively. However, only one person at a time can work in each hour and nobody can work for two consecutive hours. All are engaged to finish the work. What is the minimum amount of time that they will take to finish the work.
- View Answer for: P’s salary is 20% lower than Q’s salary which is 20% lower than R’s salary. By how much percent is R’s salary more than P’s salary?
P’s salary is 20% lower than Q’s salary which is 20% lower than R’s salary. By how much percent is R’s salary more than P’s salary?
- View Answer for: Let $p$ and $q$ be positive integers satisfying $p<q$ and $p+q=k$. What is the smallest value of $k$ that does not determine $p$ and $q$ uniquely?
Let and be positive integers satisfying and . What is the smallest value of that does not determine and uniquely?
- View Answer for: Consider the following : 1000 litres = $1m^3$ 1 metric ton = 1000 kg 1 hectare = $10000 m^2$Which of the above are correct?
Consider the following :
- 1000 litres =
- 1 metric ton = 1000 kg
- 1 hectare =
Which of the above are correct?
- View Answer for: In an examination, 80% of students passed in English, 70% of students passed in Hindi and 15% failed in both the subjects. What is the percentage of students who failed in only one subject?
In an examination, 80% of students passed in English, 70% of students passed in Hindi and 15% failed in both the subjects. What is the percentage of students who failed in only one subject?
- View Answer for: Let X be a two-digit number and Y be another two-digit number formed by interchanging the digits of X. If $(X + Y)$ is the greatest two-digit number, then what is the number of possible values of X?
Let X be a two-digit number and Y be another two-digit number formed by interchanging the digits of X. If is the greatest two-digit number, then what is the number of possible values of X?
- View Answer for: A Question is given followed by two Statements I and II. Consider the Question and the Statements. A certain amount was distributed among X, Y and Z. Question: Who received the least amount?Statement-I: X received $\frac{4}{5}$ of what Y and Z together received. Statement-II: Y received $\frac{2}{7}$ of what X and Z together received.Which one of the following is correct in respect of the above Question and the Statements?
A Question is given followed by two Statements I and II. Consider the Question and the Statements. A certain amount was distributed among X, Y and Z. Question: Who received the least amount?
Statement-I: X received of what Y and Z together received. Statement-II: Y received of what X and Z together received.
Which one of the following is correct in respect of the above Question and the Statements?
- View Answer for: A certain number of men can complete a piece of work in $6k$ days, where $k$ is a natural number. By what percent should the number of men be increased so that the work can be completed in $5k$ days?
A certain number of men can complete a piece of work in days, where is a natural number. By what percent should the number of men be increased so that the work can be completed in days?
- View Answer for: 421 and 427, when divided by the same number, leave the same remainder 1. How many numbers can be used as the divisor in order to get the same remainder 1 ?
421 and 427, when divided by the same number, leave the same remainder 1. How many numbers can be used as the divisor in order to get the same remainder 1 ?
- View Answer for: $32^5 + 2^{27}$ is divisible by
is divisible by
- View Answer for: What is the sum of the first 28 terms in the following sequence? 1, 1, 2, 1, 3, 2, 1, 4, 3, 2, 1, 5, 4, 3, 2,......
What is the sum of the first 28 terms in the following sequence? 1, 1, 2, 1, 3, 2, 1, 4, 3, 2, 1, 5, 4, 3, 2,......
- View Answer for: What is the rightmost digit preceding the zeros in the value of $30^{30}$?
What is the rightmost digit preceding the zeros in the value of ?
- View Answer for: A father said to his son, “$n$ years back I was as old as you are now. My present age is four times your age $n$ years back”. If the sum of the present ages of the father and the son is 130 years, what is the difference of their ages?
A father said to his son, “ years back I was as old as you are now. My present age is four times your age years back”. If the sum of the present ages of the father and the son is 130 years, what is the difference of their ages?
- View Answer for: Weight of 6 boys = Weight of 7 girls = Weight of 3 men = Weight of 4 womenIf the average weight of the women is 63 kg, then what is the average weight of the boys?
Weight of 6 boys = Weight of 7 girls = Weight of 3 men = Weight of 4 women
If the average weight of the women is 63 kg, then what is the average weight of the boys?
- View Answer for: $222^{333} + 333^{222}$ is divisible by which of the following numbers ?
is divisible by which of the following numbers ?
- View Answer for: A number is mistakenly divided by 4 instead of multiplying by 4. What is the percentage change in the result due to this mistake?
A number is mistakenly divided by 4 instead of multiplying by 4. What is the percentage change in the result due to this mistake?
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