UPSC Prelims 2021
Get UPSC Prelims Previous Year Question (PYQ) Papers with detailed explanations, mindmaps, organized year-wise and subject-wise for CSAT.
- MathsView Answer for: Using 2, 2, 3, 3, 3 as digits, how many distinct numbers greater than 30000 can be formed?
Using 2, 2, 3, 3, 3 as digits, how many distinct numbers greater than 30000 can be formed?
- MathsView Answer for: There are 6 persons arranged in a row. Another person has to shake hands with 3 of them so that he should not shake hands with two consecutive persons. In how many distinct possible combinations can the handshakes take place?
There are 6 persons arranged in a row. Another person has to shake hands with 3 of them so that he should not shake hands with two consecutive persons. In how many distinct possible combinations can the handshakes take place?
- MathsView Answer for: Replace the incorrect term by the correct term in the given sequence: 3, 2, 7, 4, 13, 10, 21, 18, 31, 28, 43, 40 where odd terms and even terms follow the same pattern.
Replace the incorrect term by the correct term in the given sequence: 3, 2, 7, 4, 13, 10, 21, 18, 31, 28, 43, 40 where odd terms and even terms follow the same pattern.
- MathsView Answer for: A boy plays with a ball, and he drops it from a height of $1.5$ m. Every time the ball hits the ground, it bounces back to attain a height $\frac{4}{5}$th of the previous height. The ball does not bounce further if the previous height is less than $50$ cm. What is the number of times the ball hits the ground before the ball stops bouncing?
A boy plays with a ball, and he drops it from a height of m. Every time the ball hits the ground, it bounces back to attain a height th of the previous height. The ball does not bounce further if the previous height is less than cm. What is the number of times the ball hits the ground before the ball stops bouncing?
- MathsView Answer for: A cubical vessel of side 1 m is filled completely with water. How many millilitres of water is contained in it (neglect thickness of the vessel)?
A cubical vessel of side 1 m is filled completely with water. How many millilitres of water is contained in it (neglect thickness of the vessel)?
- MathsView Answer for: From January 1, 2021, the price of petrol (in Rupees per litre) on mth day of the year is $80 + 0.1m$, where $m = 1, 2, 3, ... 100$ and thereafter remains constant. On the other hand, the price of diesel (in Rupees per litre) on nth day of 2021 is $69 + 0.15n$ for any $n$. On which date in the year 2021 are the prices of these two fuels equal?
From January 1, 2021, the price of petrol (in Rupees per litre) on mth day of the year is , where and thereafter remains constant. On the other hand, the price of diesel (in Rupees per litre) on nth day of 2021 is for any . On which date in the year 2021 are the prices of these two fuels equal?
- MathsView Answer for: In a class, 60% of students are from India and 50% of the students are girls. If 30% of the Indian students are girls, then what percentage of foreign students are boys?
In a class, 60% of students are from India and 50% of the students are girls. If 30% of the Indian students are girls, then what percentage of foreign students are boys?
- MathsView Answer for: Consider the following statements : The sum of 5 consecutive integers can be 100. The product of three consecutive natural numbers can be equal to their sum.Which of the above statements is/are correct?
Consider the following statements :
- The sum of 5 consecutive integers can be 100.
- The product of three consecutive natural numbers can be equal to their sum.
Which of the above statements is/are correct?
- MathsView Answer for: What is the value of ‘X’ in the sequence 2, 7, 22, 67, 202, X, 1822?
What is the value of ‘X’ in the sequence 2, 7, 22, 67, 202, X, 1822?
- MathsView Answer for: You are given two identical sequences in two rows: Sequence-I | 8 | 4 | 6 | 15 | 52.5 | 236.5 - | - | - | - | - | - | - Sequence-II | 5 | A | B | C | D | E What is the entry in the place of C for the Sequence-II?
You are given two identical sequences in two rows:
Sequence-I 8 4 6 15 52.5 236.5 Sequence-II 5 A B C D E What is the entry in the place of C for the Sequence-II?
- MathsView Answer for: When a certain number is multiplied by 7, the product entirely comprises ones only (1111...). What is the smallest such number?
When a certain number is multiplied by 7, the product entirely comprises ones only (1111...). What is the smallest such number?
- MathsView Answer for: There are two Classes A and B having 25 and 30 students respectively. In Class-A the highest score is 21 and lowest score is 17. In Class-B the highest score is 30 and lowest score is 22. Four students are shifted from Class-A to Class-B.Consider the following statements: The average score of Class-B will definitely decrease. The average score of Class-A will definitely increase.Which of the above statements is/are correct?
There are two Classes A and B having 25 and 30 students respectively. In Class-A the highest score is 21 and lowest score is 17. In Class-B the highest score is 30 and lowest score is 22. Four students are shifted from Class-A to Class-B.
Consider the following statements:
- The average score of Class-B will definitely decrease.
- The average score of Class-A will definitely increase.
Which of the above statements is/are correct?
- MathsView Answer for: A bank employee drives 10 km towards South from her house and turns to her left and drives another 20 km. She again turns left and drives 40 km, then she turns to her right and drives for another 5 km. She again turns to her right and drives another 30 km to reach her bank where she works. What is the shortest distance between her bank and her house?
A bank employee drives 10 km towards South from her house and turns to her left and drives another 20 km. She again turns left and drives 40 km, then she turns to her right and drives for another 5 km. She again turns to her right and drives another 30 km to reach her bank where she works. What is the shortest distance between her bank and her house?
- MathsView Answer for: A pie diagram shows the percentage distribution of proteins, water and other dry elements in the human body. Given that proteins correspond to $16\%$ and water corresponds to $70\%$. If both proteins and the other dry elements correspond to $p\%$, then what is the central angle of the sector representing $p$ on the pie diagram?
A pie diagram shows the percentage distribution of proteins, water and other dry elements in the human body. Given that proteins correspond to and water corresponds to . If both proteins and the other dry elements correspond to , then what is the central angle of the sector representing on the pie diagram?
- MathsView Answer for: X said to Y, "At the time of your birth I was twice as old as you are at present." If the present age of X is 42 years, then consider the following statements: 8 years ago, the age of X was five times the age of Y. After 14 years, the age of X would be two times the age of Y.Which of the above statements is/are correct?
X said to Y, "At the time of your birth I was twice as old as you are at present." If the present age of X is 42 years, then consider the following statements:
- 8 years ago, the age of X was five times the age of Y.
- After 14 years, the age of X would be two times the age of Y.
Which of the above statements is/are correct?
- MathsView Answer for: Jay and Vijay spent an equal amount of money to buy some pens and special pencils of the same quality from the same store. If Jay bought 3 pens and 5 pencils, and Vijay bought 2 pens and 7 pencils, then which one of the following is correct?
Jay and Vijay spent an equal amount of money to buy some pens and special pencils of the same quality from the same store. If Jay bought 3 pens and 5 pencils, and Vijay bought 2 pens and 7 pencils, then which one of the following is correct?
- MathsView Answer for: If $3^{2019}$ is divided by 10, then what is the remainder?
If is divided by 10, then what is the remainder?
- MathsView Answer for: P scored 40 marks more than Q in an examination. If Q scored 10% less marks than P, then how much did Q score.
P scored 40 marks more than Q in an examination. If Q scored 10% less marks than P, then how much did Q score.
- Maths
A person X from a place A and another person Y from a place B set out at the same time to walk towards each other. The places are separated by a distance of km. X walks with a uniform speed of km/hr and Y walks with a uniform speed of km/hr in the first hour, with a uniform speed of km/hr in the second hour and with a uniform speed of km/hr in the third hour and so on.
View Answer for: Which of the following is/are correct? They take 5 hours to meet. They meet midway between A and B.Select the correct answer using the code given below:Which of the following is/are correct?
- They take 5 hours to meet.
- They meet midway between A and B.
Select the correct answer using the code given below:
- MathsView Answer for: Consider the following multiplication problem:$(PQ) \times 3 = RQQ$, where P, Q and R are different digits and $R \ne 0$.What is the value of $(P+R) \div Q$?
Consider the following multiplication problem:
, where P, Q and R are different digits and .
What is the value of ?
- MathsView Answer for: If the price of an article is decreased by 20% and then the new price is increased by 25%, then what is the net change in the price?
If the price of an article is decreased by 20% and then the new price is increased by 25%, then what is the net change in the price?
- MathsView Answer for: In a group of 120 persons, 80 are Indians and rest are foreigners. Further, 70 persons in the group can speak English. The number of Indians who can speak English is
In a group of 120 persons, 80 are Indians and rest are foreigners. Further, 70 persons in the group can speak English. The number of Indians who can speak English is
- MathsView Answer for: Consider all 3-digit numbers (without repetition of digits) obtained using three non-zero digits which are multiples of 3. Let S be their sum. Which of the following is/are correct? S is always divisible by 74. S is always divisible by 9.Select the correct answer using the code given below:
Consider all 3-digit numbers (without repetition of digits) obtained using three non-zero digits which are multiples of 3. Let S be their sum. Which of the following is/are correct?
- S is always divisible by 74.
- S is always divisible by 9.
Select the correct answer using the code given below:
- MathsView Answer for: The number $3798125P369$ is divisible by 7. What is the value of the digit P?
The number is divisible by 7. What is the value of the digit P?
- MathsView Answer for: In an objective type test of 90 questions, 5 marks are allotted for every correct answer and 2 marks are deducted for every wrong answer. After attempting all the 90 questions, a student got a total of 387 marks. What is the number of incorrect responses ?
In an objective type test of 90 questions, 5 marks are allotted for every correct answer and 2 marks are deducted for every wrong answer. After attempting all the 90 questions, a student got a total of 387 marks. What is the number of incorrect responses ?
- MathsView Answer for: Consider the following Table : Player | Runs scored in the first innings | Balls faced in the first innings | Runs scored in the second innings | Balls faced in the second innings --|--|--|--|-- A | 61 | 99 | 14 | 76 B | 05 | 12 | 50 | 85 C | 15 | 75 | 20 | 50 D | 13 | 55 | 12 | 50 Who is the fastest run scorer in the Test Match?
Consider the following Table :
Player Runs scored in the first innings Balls faced in the first innings Runs scored in the second innings Balls faced in the second innings A 61 99 14 76 B 05 12 50 85 C 15 75 20 50 D 13 55 12 50 Who is the fastest run scorer in the Test Match?
- MathsView Answer for: A man completes $\frac{7}{8}$ of a job in 21 days. How many more days will it take him to finish the job if quantum of work is further increased by 50%
A man completes of a job in 21 days. How many more days will it take him to finish the job if quantum of work is further increased by 50%
- MathsView Answer for: The difference between a 2-digit number and the number obtained by interchanging the positions of the digits is 54.Consider the following statements: The sum of the two digits of the number can be determined only if the product of the two digits is known. The difference between the two digits of the number can be determined.Which of the above statements is/are correct?
The difference between a 2-digit number and the number obtained by interchanging the positions of the digits is 54.
Consider the following statements:
- The sum of the two digits of the number can be determined only if the product of the two digits is known.
- The difference between the two digits of the number can be determined.
Which of the above statements is/are correct?
- MathsView Answer for: A woman runs 12 km towards her North, then 6 km towards her South and then 8 km towards her East. In which direction is she from her starting point?
A woman runs 12 km towards her North, then 6 km towards her South and then 8 km towards her East. In which direction is she from her starting point?
- MathsView Answer for: An amount of money was distributed among A, B and C in the ratio $p:q:r$.Consider the following statements : A gets the maximum share if $p$ is greater than $(q+r)$. C gets the minimum share if $r$ is less than $(p+q)$.Which of the above statements is/are correct?
An amount of money was distributed among A, B and C in the ratio .
Consider the following statements :
- A gets the maximum share if is greater than .
- C gets the minimum share if is less than .
Which of the above statements is/are correct?
- MathsView Answer for: A person P asks one of his three friends X as to how much money he had. X replied, If Y gives me Rs. 40, then Y will have half of as much as Z, but if Z gives me Rs. 40, then three of us will have equal amount. What is the total amount of money that X, Y and Z have?
A person P asks one of his three friends X as to how much money he had. X replied, If Y gives me Rs. 40, then Y will have half of as much as Z, but if Z gives me Rs. 40, then three of us will have equal amount. What is the total amount of money that X, Y and Z have?
- MathsView Answer for: On a chess board, in how many different ways can 6 consecutive squares be chosen on the diagonals along a straight path?
On a chess board, in how many different ways can 6 consecutive squares be chosen on the diagonals along a straight path?
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