UPSC CSAT Quiz – 2021: IASbaba’s Daily CSAT Practice Test – 4th February 2021
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 Date February 4, 2021
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Daily CSAT Practice Test
Everyday 5 Questions from Aptitude, Logical Reasoning, and Reading Comprehension will be covered from Monday to Saturday.
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Question 1 of 5
1. Question
Jacob and Jaanu together can do a piece of work in 20 days, Jacob having worked for 14 days, Jaanu finishes the remaining work in 26 days. Doing alone, in how many days does Jaanu finishes the whole work?
Correct
Solution (a)
As per the man day’s concept, here both Jacob and Jaanu are doing the same work in 20 days.
So,
20 Jacob days + 20 Jaanu days = 14 Jacob days + 26 Jaanu days
6 Jacob days=6 Jaanu days
Their efficiency is the same, hence either of them would take the double amount of time working alone than if they were doing together.
Therefore, Jaanu will finish the whole work in 40 days if she is working alone.
Incorrect
Solution (a)
As per the man day’s concept, here both Jacob and Jaanu are doing the same work in 20 days.
So,
20 Jacob days + 20 Jaanu days = 14 Jacob days + 26 Jaanu days
6 Jacob days=6 Jaanu days
Their efficiency is the same, hence either of them would take the double amount of time working alone than if they were doing together.
Therefore, Jaanu will finish the whole work in 40 days if she is working alone.

Question 2 of 5
2. Question
The price of a pen is first increased by 25% and later on the price was decreased by 20% due to reduction in sales. Find the net percentage change in the final price of pen.
Correct
Solution (c)
Method 1
Let the original price of a pen be 100 Rs
Then after initial increase of 25%, the price of pen=100+(25/100)*100=125 Rs
Again, the price were reduced by 20%, so the reduced price is 125(20/100)*125=100 Rs
Therefore, the net change is 100100=0, i.e. no change
Method 2
Whenever the value of an object is first changed (increased or decreased)by a% and then changed(increased or decreased)by b%
Then
Net effect = { ± a ± b + (± a) (± b)/100 }
+ve sign for increase and –ve sign for decrease
As per the above question
Net percentage change = [(2520) + (25)*(20)/100]
= [55] = 0
Incorrect
Solution (c)
Method 1
Let the original price of a pen be 100 Rs
Then after initial increase of 25%, the price of pen=100+(25/100)*100=125 Rs
Again, the price were reduced by 20%, so the reduced price is 125(20/100)*125=100 Rs
Therefore, the net change is 100100=0, i.e. no change
Method 2
Whenever the value of an object is first changed (increased or decreased)by a% and then changed(increased or decreased)by b%
Then
Net effect = { ± a ± b + (± a) (± b)/100 }
+ve sign for increase and –ve sign for decrease
As per the above question
Net percentage change = [(2520) + (25)*(20)/100]
= [55] = 0

Question 3 of 5
3. Question
The average weight of 45 students in a class is 52 kg. 5 of them whose average weight is 48 kg leave the class and other 5 students whose average weight is 54 kg join the class. What is the new average weight of the class?
Correct
Solution (a)
Weight of students leaving the class=48*5
Weight of students joining the class=54*5
Now, 54*548*5=30kg is the weight added to the whole class because of this process
Class contains 45 students, whose average weight is 52kgs, hence new average weight of the class becomes, 52(30/45)= 52 (2/3) kg
Incorrect
Solution (a)
Weight of students leaving the class=48*5
Weight of students joining the class=54*5
Now, 54*548*5=30kg is the weight added to the whole class because of this process
Class contains 45 students, whose average weight is 52kgs, hence new average weight of the class becomes, 52(30/45)= 52 (2/3) kg

Question 4 of 5
4. Question
Fresh grapes contain 80% of water and dry grapes contain 20% of water. If the weight of dry grapes were 250 kg. What was its total weight when it was fresh?
Correct
Solution (a)
The weight of dry grape is 250 kg, In this weight of water is 20%, i.e. 50 kg of water and remaining 200 kg is the weight of the pulp
The weight of pulp remains same both in fresh grapes and dry grapes.
Fresh grapes contain 80% of water and 20% pulp
Here 20% of pulp=200 kg and 80% of water which is 200*4=800 kg
Therefore, total weight of fresh grapes is 1,000kg
Incorrect
Solution (a)
The weight of dry grape is 250 kg, In this weight of water is 20%, i.e. 50 kg of water and remaining 200 kg is the weight of the pulp
The weight of pulp remains same both in fresh grapes and dry grapes.
Fresh grapes contain 80% of water and 20% pulp
Here 20% of pulp=200 kg and 80% of water which is 200*4=800 kg
Therefore, total weight of fresh grapes is 1,000kg

Question 5 of 5
5. Question
Read the following passage and answer the questions that follow the passage. Your answer to these questions should be based on passage only.
The power perspective sees democracy as an effort to balance social power. History is a chronicle of societies where social power has been concentrated in a few hands. Democracy proposes that social power be distributed as widely and evenly as possible and, where it must be concentrated, it is made constitutionally answerable to those over whom it is exercised. Not surprisingly, the power perspective on democracy is concerned with institutions, constitutions, and other formal arrangements that impose structure and balance on social power relationships. It sees power as an essentially competitive phenomenon: we all seek more power to pursue our own interests.
The participation perspective sees democracy as an activity through which citizens participate in their community. Participation is considered a basic human need, a natural outgrowth of our social nature. Public life in general and political activity in particular, allows us to partake in and shape a larger world beyond ourselves. Furthermore, democratic activity enables us to better understand and develop (or “actualize”) ourselves through active relationships with other people. Power is seen as a cooperative, rather than competitive phenomenon – something we get by working together. From this participatory perspective, democracy is something we do and live, not something we have or make. Improving our “living democracy” is a matter of developing and using democratic forums and learning democratic skills.
The intelligence perspective sees democracy as a factor that supports the exercise of collective intelligence. By collective Intelligence I mean a group’s or society’s capacity to respond, collectively, to its changing circumstances; to make creative use of opportunities; to articulate and pursue visions and purposes; and to evolve as a culture. Authoritarian groups can be no more intelligent than their leaders. Such groups tend to be less intelligent than democratic groups because excess power tends to distort the powerholders’ ability to think and feel clearly and appropriately. Furthermore, authoritarian systems tend to neglect or suppress the potential contributions of nonleaders.
While the power perspective on democracy focuses on institutions – and the participation perspective focuses on the democratic arts – the intelligence perspective focuses on collective dynamics and learning in groups, communities and whole societies. All three perspectives combined can provide us with an indepth, 3D, vibrantly alive sense of what democracy is all about.
Democratic institutions provide scope to collective intelligence. An example of this would be
Correct
Solution (a)
Think tanks provide a scope for collective intelligence. Hence this is the intelligence perspective of democracy.
Democracy does not provide for existence of authoritarian power centres. Option (c) is power perspective whereas option (d) is participation perspective.
Incorrect
Solution (a)
Think tanks provide a scope for collective intelligence. Hence this is the intelligence perspective of democracy.
Democracy does not provide for existence of authoritarian power centres. Option (c) is power perspective whereas option (d) is participation perspective.