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Considering the alarming importance of CSAT in UPSC CSE Prelims exam and with enormous requests we received recently, InsightsIAS has started Daily CSAT Test to ensure students practice CSAT Questions on a daily basis. Regular Practice would help one overcome the fear of CSAT too.
We are naming this initiative as Insta– DART – Daily Aptitude and Reasoning Test. We hope you will be able to use DART to hit bull’s eye in CSAT paper and comfortably score 100+ even in the most difficult question paper that UPSC can give you in CSP2021. Your peace of mind after every step of this exam is very important for us.
Looking forward to your enthusiastic participation (both in sending us questions and solving them on daily basis on this portal).
Wish you all the best ! 🙂
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Question 1 of 5
1. Question
The average age of 60 students is 20 years. When 15 new students are admitted, the average increases by 0.4 years. What must be the average age of the new students?
Correct
Solution: A) 22 years
Let the average age of the newly admitted 15 students be x years.
Therefore, total age of 15 newly admitted students = 15x
Since given average age of existing 60 students = 20
Therefore, total age of the existing 60 students = 60×20
Hence, total age of the 75 students = 60×20 + 15x
Since average after admission of new students increases by 0.4 years.So new average = 20.4 years
è 60×20 + 15x =75×20.4
è 1200 + 15x = 1530
è 15x = 15301200
è 15x = 330
è x = 330/15
è x = 22 yearsHence, option (a) is correct.
Incorrect
Solution: A) 22 years
Let the average age of the newly admitted 15 students be x years.
Therefore, total age of 15 newly admitted students = 15x
Since given average age of existing 60 students = 20
Therefore, total age of the existing 60 students = 60×20
Hence, total age of the 75 students = 60×20 + 15x
Since average after admission of new students increases by 0.4 years.So new average = 20.4 years
è 60×20 + 15x =75×20.4
è 1200 + 15x = 1530
è 15x = 15301200
è 15x = 330
è x = 330/15
è x = 22 yearsHence, option (a) is correct.

Question 2 of 5
2. Question
In a group of 1500 people, 700 can speak Hindi, 500 can speak English and 150 can speak both. Find the number of people who can speak at most one language?
Correct
Solution: C) 1350
The number of people who can speak at most one language = Total number of people – Number of people who can speak both the languages
è 1500 – 150 = 1350Hence, option (c) is correct.
Incorrect
Solution: C) 1350
The number of people who can speak at most one language = Total number of people – Number of people who can speak both the languages
è 1500 – 150 = 1350Hence, option (c) is correct.

Question 3 of 5
3. Question
If an amount doubles itself in 5 years, then in how many years will it be 8 times of the original amount, if it grows with an interest rate compounded annually?
Correct
Solution: B) 15 years
Let the initial amount be x.
In 5 years the amount gets doubled, i.e. total amount=2x
In the next 5 years, i.e 10 years amount gets doubled again, i.e. total amount=4x
Similarly, in the next 5 years, i.e 15 years the total amount= 2 × 4x = 8x.Hence, option (b) is correct.
Incorrect
Solution: B) 15 years
Let the initial amount be x.
In 5 years the amount gets doubled, i.e. total amount=2x
In the next 5 years, i.e 10 years amount gets doubled again, i.e. total amount=4x
Similarly, in the next 5 years, i.e 15 years the total amount= 2 × 4x = 8x.Hence, option (b) is correct.

Question 4 of 5
4. Question
In an examination if total boys and total girls appear in the ratio
11:13, then which of the following can be the total number of students appearing in the examination?Correct
Solution: C) 240
Let the total number of boys be 11x and total number of girls be 13x.
Therefore, total students will be 24x.
Therefore, total number of students appearing in the examination must be a multiple of 24.
Looking at the options, option (b) and option (d) can be directly eliminated as they are odd numbers.
By looking at remaining options, it can be clearly seen that 240 is completely divisible by 24.
Hence, option (c) is correct.
Incorrect
Solution: C) 240
Let the total number of boys be 11x and total number of girls be 13x.
Therefore, total students will be 24x.
Therefore, total number of students appearing in the examination must be a multiple of 24.
Looking at the options, option (b) and option (d) can be directly eliminated as they are odd numbers.
By looking at remaining options, it can be clearly seen that 240 is completely divisible by 24.
Hence, option (c) is correct.

Question 5 of 5
5. Question
P scored more than R, Y scored as much as D. L scored less than M. R scored more than Y. M scored less than D. Who scored the lowest?
Correct
Solution: c) L
Justification:
P scored more than R: P>R
Y scored as much as D: Y=D
L scored less than M: M>L
R scored more than Y: R>Y
M scored less than D: D>M
Final arrangement: P>R>Y=D>M>L
Hence, L scored the lowest.
Incorrect
Solution: c) L
Justification:
P scored more than R: P>R
Y scored as much as D: Y=D
L scored less than M: M>L
R scored more than Y: R>Y
M scored less than D: D>M
Final arrangement: P>R>Y=D>M>L
Hence, L scored the lowest.