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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 CSP-2021. 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
An analog clock is showing 09:20. After how much time will the clock show its mirror image?
Correct
Solution: A) 5 hours 20 minutes
Explanation:
For mirror image, we have to take 12:00 or 6:00 as reference time as their mirror images are same as the real image.
09:20 is 2 hours 40 minutes before 12:00.
Therefore, the mirror image of this will be 2 hours 40 minutes after 12:00 i.e. 02:40.
Therefore, from 09:20 to 02:40, there is a time gap of 5 hours 20 minutes.
Incorrect
Solution: A) 5 hours 20 minutes
Explanation:
For mirror image, we have to take 12:00 or 6:00 as reference time as their mirror images are same as the real image.
09:20 is 2 hours 40 minutes before 12:00.
Therefore, the mirror image of this will be 2 hours 40 minutes after 12:00 i.e. 02:40.
Therefore, from 09:20 to 02:40, there is a time gap of 5 hours 20 minutes.
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Question 2 of 5
2. Question
A sum of Rs.11500 is shared among A, B and C. A gets 1/4th of it while B gets 1/5th of it. How much does C get?
Correct
Answer: (b) Rs.6325
Justification:
C’s share = Total amount – (A’s share + C’s share)
= 11500 – ((1/4) + (1/5)) th of 11500
= 11500 – (9/20) th of 11500
= (11/20) th of 11500
= Rs.6325
Incorrect
Answer: (b) Rs.6325
Justification:
C’s share = Total amount – (A’s share + C’s share)
= 11500 – ((1/4) + (1/5)) th of 11500
= 11500 – (9/20) th of 11500
= (11/20) th of 11500
= Rs.6325
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Question 3 of 5
3. Question
In a class, the average weight of students is 40kgs. If a student weighing 52kgs joins the class, the average weight increases by 1kg. How many students were there in the class initially?
Correct
Correct Answer : A) 11
Answer Justification :
Justification:
Let the number of students be ‘x’.
The initial weight of the class = 40x kgs
The final average weight of the class = 40 + 1 = 41kgs
The final weight of the class = 41 (x+1) kgs
But, Final weight – Initial weight = weight of new student
41 (x+1) – 40x = 52
41x + 41 – 40x = 52
x + 41 = 52
x = 52 – 41 = 11.
Thus, the initial number of students = 11.
Incorrect
Correct Answer : A) 11
Answer Justification :
Justification:
Let the number of students be ‘x’.
The initial weight of the class = 40x kgs
The final average weight of the class = 40 + 1 = 41kgs
The final weight of the class = 41 (x+1) kgs
But, Final weight – Initial weight = weight of new student
41 (x+1) – 40x = 52
41x + 41 – 40x = 52
x + 41 = 52
x = 52 – 41 = 11.
Thus, the initial number of students = 11.
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Question 4 of 5
4. Question
The ratio of Rate of filling of two Pipes I and J is 3:4. If together they can fill a Tank 2/3 rd of Tank in 16 minutes. Then in how many does J alone can fill the Tank?
Correct
Correct Answer: A) 42minutes
Explanation:
2/3 of tank in 16 minutes
full in tank in 24 minutes
(1/4x +1/3x) = 1/24
x =14 J = 3x = 14*3 = 42 minutesIncorrect
Correct Answer: A) 42minutes
Explanation:
2/3 of tank in 16 minutes
full in tank in 24 minutes
(1/4x +1/3x) = 1/24
x =14 J = 3x = 14*3 = 42 minutes -
Question 5 of 5
5. Question
In a 500 meters race, B starts 45 meters ahead of A, but A wins the race while B is still 35 meters behind. What is the ratio of the speeds of A to B assuming that both start at the same time?
Correct
Correct Answer: A) 25: 21
Solution:
When A completes and wins the race, at that time B covers 500 – (45 + 35) = 420 meters.
Hence, the ratio between A and B is 500: 420 = 25: 21
And this is ratio of speeds of A to B.
Incorrect
Correct Answer: A) 25: 21
Solution:
When A completes and wins the race, at that time B covers 500 – (45 + 35) = 420 meters.
Hence, the ratio between A and B is 500: 420 = 25: 21
And this is ratio of speeds of A to B.
