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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
How many natural numbers up to 100 are not divisible by 3 or 7?
Correct
Correct Answer : B
Explanation:
Numbers divisible by 3 = 100/3 = 33 Numbers divisible by 7 = 100/7 = 14
Numbers divisible by 21 (LCM of 3 and 7) = 100/21 = 4
Total numbers divisible by 3 or 7 = 33 + 14 – 4 = 43
Total numbers which are not divisible by 3 or 7 = 100 – 43 = 57
Incorrect
Correct Answer : B
Explanation:
Numbers divisible by 3 = 100/3 = 33 Numbers divisible by 7 = 100/7 = 14
Numbers divisible by 21 (LCM of 3 and 7) = 100/21 = 4
Total numbers divisible by 3 or 7 = 33 + 14 – 4 = 43
Total numbers which are not divisible by 3 or 7 = 100 – 43 = 57
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Question 2 of 5
2. Question
In a certain code, ‘256’ means ‘red colour chalk’, ‘589’ means ‘green colour flower’ and ‘254’ means ‘white colour chalk’. The digit in the code that indicates ‘white’ is
Correct
Correct Answer : B
Explanation:
‘256’ = ‘red colour chalk’
‘589’ = ‘green colour flower’
‘254’ = ‘white colour chalk’
5 and colour are common in all three. So, 5 = Colour, 2 = Chalk
Red = 6, White =4
Incorrect
Correct Answer : B
Explanation:
‘256’ = ‘red colour chalk’
‘589’ = ‘green colour flower’
‘254’ = ‘white colour chalk’
5 and colour are common in all three. So, 5 = Colour, 2 = Chalk
Red = 6, White =4
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Question 3 of 5
3. Question
A boat takes 28 hours for travelling downstream from point A to point B and coming back to
Correct
Correct Answer : B
Explanation:
Downstream speed = 9+6 = 15
Upstream speed = 9-6 = 3
Now total time is 28 hours
If distance between A and B is d, then distance BC = d/2 Now distance/speed = time, so
d/15 + (d/2)/3= 28, solve d = 120
Incorrect
Correct Answer : B
Explanation:
Downstream speed = 9+6 = 15
Upstream speed = 9-6 = 3
Now total time is 28 hours
If distance between A and B is d, then distance BC = d/2 Now distance/speed = time, so
d/15 + (d/2)/3= 28, solve d = 120
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Question 4 of 5
4. Question
How many litres of water must be added to 60 litres of mixture that contains milk and water in the 7:3 such that the resulting mixture has 50% water in it?
Correct
Correct Answer : C
Solution:
Milk = (7/10) *60 = 42 litres.
Water = (3/10) *60 = 18 litres.
So water must be added = 42 – 18 = 24
Incorrect
Correct Answer : C
Solution:
Milk = (7/10) *60 = 42 litres.
Water = (3/10) *60 = 18 litres.
So water must be added = 42 – 18 = 24
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Question 5 of 5
5. Question
Two pipes P and Q can fill a cistern in 12 hours and 4 hours respectively. If they are opened in alternate hours and if pipe A is opened the first hour, in how many hours will the tank be full?
Correct
Correct Answer : D
Explanation:
Pipe P can fill = 1/12
Pipe Q can fill = 1/4
For every two hour, 1/12 + 1/4 = 1/3 Part filled (in 2 hours) Total = 6 hours.
Incorrect
Correct Answer : D
Explanation:
Pipe P can fill = 1/12
Pipe Q can fill = 1/4
For every two hour, 1/12 + 1/4 = 1/3 Part filled (in 2 hours) Total = 6 hours.
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