ALL INDIA PRELIMS TEST SERIES - 2020...1 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes:...

1 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487

ALL INDIA PRELIMS TEST SERIES - 2020 CSAT PART-3

ANSWER KEY

1. Ans: (a)

Explanation:

Statement 1 can be inferred.

Refer to these lines, “Around the year 1948

the invention of the transistor, a device with

the potential to have numerous applications

in radio technology by replacing the vacuum

tube took place.”

From these lines, we know that transistors

replaced vacuum tubes as the major

component in radio technology, so it is

evident that vacuum tubes were the big

things before transistors as they were used

extensively before transistors.

Hence the statement is correct.

Statement 2 cannot be inferred.

Refer to these lines, “The presence of the

transistor enables all kinds of binary logic

operations and has brought a revolution to

the field of electronics and computing.”

From these lines it is evident that

introduction of transistors enabled binary

operations to be performed by computers,

however, when the author says it has brought

in revolution to computation, he is referring

to the introduction of transistors as

performing logical operations is one of the

features of transistors.

2. Ans: (b)

Explanation:

Statement 1 is incorrect

Refer to this line, “Once in orbit, the capsule

will be in almost zero-G condition and hard

vacuum, and will be subjected to heavy

radiation.”

The conditions the space shuttle has to go

through mentioned here are not in

conjunction with each other and are different

conditions.

Hence the statement is incorrect.

Statement 2 is correct.

Refer to the line, “Training of astronauts to

face zero-G as well as high acceleration levels

during launch and re-entry needs a thorough

understanding of the behavior of human

physiology and psychology as well as

conditioning the astronauts by going through

a series of simulated environmental tests. A

branch medicine i.e. space medicine will

emerge.‟”

From these lines, it is evident that the new

field of medicine i.e. space medicine is to deal

with the effects of zero-G on the astronauts

physically and psychologically.

Hence it is correct.

3. Ans: (a)

Explanation: Statement 1 is correct.

Throughout the entire passage, the author

explains that the regularly occurring climate

change is the reason for migration. However,

the increased disruption in climate due to

global climate change has caused disruptions

in the migratory patterns as explained in the

last 2 sentences.


Statement 2 is incorrect.

Refer to these lines from the passage,

“Furthermore, human land-use and activity

patterns will constrain the ability of many

species to modify their migratory routes and

may increase the stress induced by climate

change.”

These lines indicate that human activities

have indeed affected the regular migratory

paths and behaviours.


4. Ans: (c)

Explanation: Option a is incorrect

The term silver bullet is used to highlight that

the solution offered is the ultimate one that

can address all the problems easily, not that

the solution is expensive or rare.

Hence the option is incorrect.

Option b is incorrect.

Refer to these lines, “While the promise and

potential of blockchain is undoubtedly

transformative, what hasn‟t helped this

technology, that is still in the nascence of its


evolution, has been the massive hype and the

irrational exuberance promulgated by a bevvy

of „Blockchain Evangelists.”

From the lines, it is evident that the hype

created around the blockchain has certainly

helped increase its popularity, that has in no

way helped this technology in its

development.

5. Ans: (d)

Explanation:


Refer to these lines, “For the last half-

century, a deadly fungus has wiped out

populations of frogs and salamanders around

the world. Known as chytrid, it has driven the

decline or extinction of at least 500 species,

making it the world‟s most destructive

pathogen in terms of biodiversity loss.“

It is mentioned that the deadly fungus has

wiped out populations of frogs and

salamanders worldwide, however, it is not

mentioned in the passage that the fungus

was introduced as a biological attack, hence

the statement is incorrect.


Refer to this line from the passage, “After the

disease swept through Panama‟s Parque

Nacional Omar Torrijos Herrera beginning in

2004, the overall number, diversity, and

health of snakes declined significantly, the

paper found. That‟s likely true for other

amphibian predators as well.”

It is mentioned that the death toll of toads

significantly affected the population of snakes

nonetheless that is not the intended purpose

of the national park rather it is an undesired

outcome.

Hence it is incorrect.

6. Ans: (b)

Explanation:


Refer to the following lines, “Being

transcendentalist and not materialist,

Gandhian socialism is averse to physical

coercion or violence to bring about social,

economic or political change and seeks social

cohesion as opposed to the Marxian dialectic

of revolutionary class struggle.”

The difference in Gandhian socialism and

Marxian socialism is in the way they bring

about social, economic or political change,

Gandhian socialism is not averse to bringing

about these changes.

Statement 2 is correct

Refer to the following lines, “Gandhian

socialism is anti-imperialist, opposes

unbridled urbanisation and industrialisation

at the expense of rural development and

through its concept of „trusteeship‟ urges the

capitalist class to regard its excess wealth as

a trust to be used for the welfare of the poor

and downtrodden.”

From these lines, it is evident that Gandhian

socialism prioritised the welfare of poor and

downtrodden and was opposed to unbridled

urbanisation and industrialisation at the

expense of rural development.



Referring to these lines, Gandhian socialism

is also averse to centralised planning and

seeks to make villages self-sufficient both in

administrative and economic terms.”

From these lines, it is evident that Gandhian

socialism wants villages to be self-sufficient

and wants to do away with centralised

planning because both the ideas contradict

each other.


7. Ans: (c)

Explanation:


Refer to these lines, “A lot of the welfare

groups lobby for the kittens and the

puppies—they want no-kill shelters. The cat

ladies get a bigger following,” Yamazaki said.

“Our goal is to make Japan‟s animal welfare

law applicable to all animals—farm animals,

zoo animals, lab animals.” ”

These lines show that there aren‟t enough

welfare groups speaking out for fair treatment

of circus monkeys.



Refer to these lines, “Japan has a long history

of using animals for entertainment, but

sensitivities toward a cultural tradition

shouldn‟t prevent performing monkeys from

being protected from abuse, she said” But

culture evolves—it‟s not set in stone.”


Here the author is saying that having a

cultural history shouldn‟t be a barrier to

extending help to the needy animals in this

case the circus animals as the culture is ever-

evolving and not set in stone.


8. Ans: (a)

Explanation:


Refer to these lines, „Rapid economic growth

together with controlled inflation, and

increasing global competitiveness in key

markets, has fuelled the rapid growth of a

vibrant middle class and private health

sector. It has also lifted millions out of

poverty. This much desirable trend, however,

is creating substantial demands for improving

the performance of the health system in

India.”

From these lines it is evident that numerous

factors like global competitiveness, rapid

economic growth, controlled inflation all have

led to this condition where the growth of

middle class is facilitated, So just stating

rapid economic growth alone has enabled this

is wrong.



Refer to the last line of the passage, where

the author is discussing how the healthcare

system in India is lacking in many

dimensions compared to similar countries.


9. Ans: (d)

Explanation:


Refer to this line, “Parker is gathering new

data about the solar particles and magnetic

fields that comprise the solar wind. More

specifically, two of its main goals are to

examine the energy that heats the corona and

speeds up the solar wind, and determine the

structure of the wind‟s magnetic fields.”

Here the author is talking about how the data

collected will be used to study the solar winds

and the magnetic fields that constitute it.

However, it is not explained in the passage

whether the knowledge will be used to

harness energy from the magnetic fields,

hence the statement is incorrect.


Refer to these lines from the passage, “The

solar wind impacting Earth‟s magnetosphere

is responsible for triggering those majestic

auroras typically seen at locations close to

our north and south poles. In some cases it

can also set off space weather storms that

disrupt everything from our satellites in

space, to ship communications on our

oceans, to power grids on land.”

It is explained that the solar wind is

responsible for the aurora lights and

disruption in communication, and aurora

lights are not listed as the reason for the

communication disruptions.


10. Ans: (a)

Explanation:


Refer the following lines, “Over 90 percent of

maternal deaths occur in low- and middle-

income countries.” and “Women and girls

perform a A disproportionate share of unpaid

domestic work and lack autonomy in

decision-making.” This line stresses the fact

that women are the greater sufferers in low-

income countries


Refer these lines, “The other defining issue of

our time is increasing inequality among and

within countries.” And “Youth are three times

more likely to be unemployed than adults.“

These lines show that youth are more

unemployed in poor and Developing countries

because of the prevalent inequality that exists

in these countries and it is not

unemployment that causes inequality in

these countries.

11. Ans: (c)

Explanation: Let the distance between his

home and school be „d‟.

Framing an equation for the total time taken,

+

= 10

Solving, d = 24km

12. Ans: (d)

Explanation: Speed of the train without any

stoppage = 60 km/hr


i.e. The train travels 60 Kms in 60 minutes

which means it travels 40 Kms in 40

minutes

Therefore in the second case with stoppages,

Train would have travelled 40 Kms in 60

minutes and had an overall stoppage time of

60-40 = 20 minutes in 1 hour.

13. Ans: (d)

Explanation: Speed of Amal = 36 km/hr = 36

× (5/18) = 10 m/s

Speed of Bimal = 54 km/hr = 54 × (5/18) =

15 m/s

Time taken by Amal to complete one round =

1500/10 = 150 seconds

Time taken by Bimal to complete one round =

1500/15 = 100 seconds

Case 1 (Both of them are moving in the

same direction)

They will meet at the starting point at a time

which is the LCM of the timings taken by

each of them to complete one full round. i.e.,

the LCM of 150s and 100 s which is 300

Seconds

Case 2 (Both of them are moving in the

opposite directions)

They will meet at the starting point at a time

which is the LCM of the timings taken by

each of them to complete one full round. i.e.,

the LCM of 150s and 100s which is 300

Seconds. ie. The time taken by them to meet

for the first time at the starting point does not

change whether they are running in the same

direction or in the opposite direction.

14. Ans: (a)

Explanation: After 27 days, food left = 4 200

= 800 units of food.

Since there are only 80 refugees, this food

would last for 800/80 = 10 days.

Thus, the number of extra days for which the

food lasts = 10-4 = 6 days.

15. Ans: (c)

Explanation: If initially She uses x litres of

petrol every day and now she is using 1.25x

litre petrol every day then full tank petrol will

last for:

= 8

16. Ans: (c)

Explanation: Let‟s mark the circles as A, B

and C.

Circle A is moving in the clockwise direction

whereas Circle C is moving in the anti-

clockwise direction. Circle B interchanges the

position of white space in vertically opposite

quadrants. Hence, the final answer would be:

17. Ans: (a)

Explanation: If you observe the options, all of

them are perfect squares whose roots are,

27,26,25 and 24.

Consider Option (a), 729. Root of 729 = 27,

where A = 2, C=7.

As per the condition B>A, so let B=3.

Thus, AC × BC=27 × 37=999. Thus, Option

(a) will be the required solution.

18. Ans: (c)

Explanation:

New Average =

= 21

19. Ans: (b)

Explanation: Let the three consecutive even

numbers be n, n+2 and n+4.

Given, n+n+2+n+4 = 52+

3n+6 = 52 + n + 2

n =24

20. Ans: (c)

Explanation: Throughout the passage, The

Author has tried to highlight the importance


of young people‟s participation in bringing

cultural and political changes in the country.

He has illustrated the same with the help of

several examples. For this reason, without

doubt we can select Option (c) as the right

answer.

21. Ans: (b)

Explanation: Although the first sentence of

the paragraph could have been a possible

reason for his candidature, There is no

mention in the passage regarding the exact

reason for considering him making statement

1 incorrect. The second statement is clearly

an incorrect one as the Noble prizes are not

awarded Posthumously. However, the Third

Statement is a correct one as there were no

Nobel peace prizes awarded in the year 1948

as per the second last sentence of the

paragraph.

22. Ans: (b)

Explanation: Options (a) and (b) are trying to

convey the same message. However, Option

(b) clearly stands apart as it gives out a much

clearer image of the passage. Options (c) and

(d) can be immediately ruled out as those are

examples provided in the passage to

substantiate the main theme.

23. Ans: (a)

Explanation: The first statement is an

incorrect one. Although the coir industry is

the largest cottage industry in Kerala, it is not

necessarily the largest employment provider

in the state. The second statement is clearly

an incorrect one as no relationship is

established between the coir industry and a

natural harbour in the passage. Statement 3

qualifies as a correct statement because of

the statement “Both men and women are

actively involved in the production of Coir.

The women are mainly involved in the yarn

spinning sector and the men in the product-

weaving sector.” This stands as an example of

gender equality in the state.

24. Ans: (d)

Explanation: Both the statements are

incorrect. When Statement 2 is a direct

contradiction of the sentence “ It does not

offer in the first instance a scientific study of

those societies that are called democratic”,

There is no evidence given in the passage to

establish a relation between the two facts

given in the statement 1.

25. Ans: (b)

Explanation: The last sentence of the

paragraph talks about the failure of

technology. This eliminates the possibility of

options a,c and d becoming the right answer.

26. Ans: (d)

Explanation: As the author feels that the

policies taken by the Government are not

effective in reviving the economy, He is

comparing the scenario with a doctor

prescribing his patient with the wrong

medicine.

27. Ans: (a)

Explanation: Throughout the passage, The

Author is trying to highlight the importance of

the theory of two truths. However, the other

options stand irrelevant given the context of

the passage.

28. Ans: (b)

Explanation: As per the sentence, “This

puzzle is really a small piece in a much bigger

puzzle: how the human mind works. It's

unlikely that scientists will arrive at a

definitive explanation of the mind in the

foreseeable future”, it is obvious that

Hypnosis remains a mystery, because

neither it is unexplored nor because of the

inability of the hypnotised person to recover

the memories. Science is yet to understand

the working of mind only after which they will

be able to understand Hypnosis.

29. Ans: (b)

Explanation: Her mother's brother → Her

Uncle

Only son of my father's father → His father

himself

So, The girl‟s mother is his father‟s sister →

Aunt


30. Ans: (d)

Explanation: K × N $ J + F → K is the

sister of N, N is the father of J, J is the

brother of F. Here, J is the son of N and so, K

will be his aunt.

F × J + N $ K → F is the sister of J, J is the

brother of N, N is the father of K. Here K is J‟s

father/mother‟s brother or Uncle.

N + K × F $ J → N is the brother of K, K is

the sister of F, F is the father of J. Again, K is

J‟s father‟s sister.

K $ N × J + F → K is the father of N, N is

the sister of J. These two statements together

means that K is the father of J.

31. Ans: (b)

Explanation:

Applying Pythagoras theorem,

d= √ = 40√ m

32. Ans: (a)

Explanation:

Now, the above diagram can be redrawn with

the given conditions.

Now, as is evident from both the diagrams,

the original directions are shifted by 135

degrees in the anti-clockwise direction.

So, the North East direction in the actual

map will be replaced by the direction which is

now 135 degrees in the clockwise direction.

Which is South.

33. Ans: (d)

Explanation: The face with 2 diagonals (X)

will be on the opposite side of the face with

two horizontal lines. The face with a dot will

be opposite to the face with two vertical lines

and the remaining two sides will be opposite

to each other. Both images I and III correctly

represent the box. Also, in closed position,

the sides with 2 lines will either be vertical or

horizontal (depending on the perspective of

vision). So (2) can be rejected.

34. Ans: (b)

Explanation: Similar to Q no. 33, the face

with 3 dots will be opposite to the face with 5

dots.

35. Ans: (d)

Explanation: Cost price of type I orange =

100/20 = Rs. 5/orange

Cost price of type II orange = 100/25 = Rs.

4/orange

Average price when both these types are

mixed (equal quantity)

= (4+5)/2 = Rs. 4.5

Selling price of an orange = 100/18 = Rs. 5

Profit made per orange = 5

4.5 = Rs. 1

Number of oranges sold = Number of oranges

bought =

= 324

So, he bought 324/2 = 162 oranges of each

type.

Alternate method:

Let us assume that he bought x oranges of

each type.

Total number of oranges bought/sold = 2x

Profit = Total SP - Total CP = (

) - [(5

× x) + (4 × x)]=Rs. 342

=> x(

) =342=> x=

× 18=162


36. Ans: (d)

Explanation: Let the CP of the sedan be = S

and the CP of the minivan be = M

→ Their SP will be:

Sedan = 1.15S

Minivan = 1.2M

Now, 1.15S = (

) 1.2M

→ 1.15S =

× 1.2M = 1.5M

So, the ratio of CP will be (Sedan: Minivan) =

30: 23

So, the overall profit % will be =

=

=17.17%

37. Ans: (d)

Explanation: Option a and b are way off-

topic as they discuss points that are not

discussed and are irrelevant do they can be

discarded immediately.

Refer to these lines, “The emperor was at the

helm of the administration following the

established model put forward by Mauryan

Kings before Ashoka. He was closely assisted

in his administrative duties by his younger

brother, Vithashoka and a group of trusted

ministers, whom Ashoka consulted before

adopting any new administrative policy.

Asoka‟s reign saw the introduction of a large

number of benevolent policies as compared to

his predecessors. He adopted a paternalistic

view on administration and proclaimed "All

men are my children", as evident from the

Kalinga edict. “

From these lines, we understand that Ashoka

continued the administration established by

his predecessors, and it is his view to treat

his subjects with a paternal view. From this,

we can eliminate option c as it is wrong and

option d is the right one.

38. Ans: (d)

Explanation:


Throughout the passage, it is established that

the scientists are speculating various theories

on how the virus spread, it is not stated that

they have agreed that spillover is the reason

for the virus to spread to humans.



According to the passage the scientists are

theorising on whether the phenomenon of

spillover is the reason and judging from the

previous cases of outbreaks they believe that

the most trafficked animal must be the

reason for the outbreak and in this case, it is

the pangolin.


39. Ans: (c)

Explanation: As per the statement, “The very

fact that government hospitals fail to provide

adequate medical assistance is a gross

violation of right to life guaranteed under

Article 21”, Option (c) will be the obvious

answer for the question. Although Option (a)

is a violation of article 21, we‟ll neglect it as it

is not discussed in the passage.

40. Ans: (c)

Explanation: This is a tricky question as

most of the options (a), (b) and (c) are correct

as per the passage. As the whole idea of

passage was to convey that the focus of the

automobile industry needs to focus on

Developing economies, considering the

increasing demand, Option (c) clearly stands

apart. As for Option (d), it is mentioned in the

passage that people in mature economies are

satisfied with today‟s vehicles which does not

mean that they are not interested in them.

41. Ans: (d)

Explanation:


The statement contradicts the message

passed in the passage. Refer to the 2nd

paragraph, it talks about the problems

women are facing from FGM not its benefits.


The governments may have undertaken

numerous actions and awareness campaigns

to prevent the practice of FGM worldwide.

However that information was not shared in

the passage hence not relevant to consider,

hence that statement is incorrect.


42. Ans: (d)

Explanation: Option a and b are both

explained in the passage, they are both

individual steps involved in the food chain.

However, they are not the points the author is

trying to highlight in the Passage.

Option c is incorrect as the author has not

mentioned about food chains being closed

loops hence that option can be discarded.

Option d is correct.

By explaining the working and various level

involved in the food chain the author is

saying that it is important for us to

understand how the food chain works. Hence

it is the message the author is trying to pass.

43. Ans: (b)

Explanation:


In the 1st paragraph the author is discussing

the negative impacts coal mining has on the

environment.

And in the last paragraph, the author

explains the negative effects of coal-burning

on the environment.

However, nowhere in the passage has the

author compared both the negative actions

and claims one of them is worse than the

other.



Refer the last line of the passage, “Upon

burning, coal produces a number of gaseous

byproducts, including carbon dioxide,

nitrogen oxide, sulfur dioxide and methane

gas, all of which contribute to global climate

change” Here the author explains that

burning coal releases many byproducts which

in turn contribute to global climate change.


44. Ans: (d)

Explanation: Option (a) is incorrect as the

author used the exclusion of Pluto from the

list of planets as an example, and examples

are not part of the main theme.

Refer to this line, “It is common to think of

believing as involving entities—beliefs—that

are in some sense contained in the mind.”

The author used this as the 1st line to show

what the believing is commonly thought as

and further into the passage he gives another

aspect into the definition which is different

from the commonly thought explanation.

Hence it is not the main theme.

Refer these lines, “In one way of speaking, the

belief just is the fact or proposition

represented or the particular stored token of

that fact or proposition; in another way of

speaking, the more standard in philosophical

discussion, the belief in the state of having

such a fact or representation stored.”

Throughout the entire passage, the author

gives an understanding and moulds a

definition of what belief is.

Option d is a much more appropriate choice

Option c is talking about memory which is

wrong and not aligned with the passage.

45. Ans: (a)

Explanation:


In the opening line of the passage, the author

says that developing countries have outdated

and deteriorated stocks of pesticides.

However, it doesn‟t mean that the converse is

true. That is the presence of Outdated

pesticides are not an indicator of whether a

country is developing or not.


As discussed in these lines, “the

recommended disposal method would appear

to be the shipment of the pesticides to a

country that has special hazardous waste

incineration facilities. In view of the

dangerous nature of these pesticides and the

high costs of safe and environmentally sound

disposal, the long-term solution to obsolete

stocks lies in preventive measures: improved

stock management and reduction of stocks.”

The author is suggesting to reduce the

stockpiling of pesticides.

So certainly the inference that more special

hazardous waste incineration

Facilities should be build is wrong.

Statement 3 can be inferred.

Refer these lines from the passage, “In view of

the dangerous nature of these pesticides and

the high costs of safe and environmentally

sound disposal, the long-term solution to

obsolete stocks lies in preventive measures:

improved stock management and reduction of

stocks.”


The author is pointing out that ensuring

proper stock management and time will

reduce stockpiling of expired pesticides. This

indicates that these countries lack proper

stock management.

Hence the inference is correct.

46. Ans: (a)

Explanation: Throughout the passage, As the

Author is trying to specifically highlight the

effects of the drug on the human brain, we

can choose Option (a) as the correct answer.

All the other options are not relevant

considering the given question.

47. Ans: (d)

Explanation: The ageing of twins is just an

example given in the passage to explain the theory of relativity in that particular context.

However, it has nothing to do with the ageing

process of twins. Hence, Option (a) is

incorrect. As per the statement, “ Also, under Einstein's theory of general relativity, gravity can

bend time.”, It is clear that gravity affects time. So, Option (b) is incorrect. As per the

passage, Einstein did not invent any

spaceship, hence Option (c) is incorrect. As per the sentence, “Approaching the speed of

light, a person inside a Time travel spaceship

would age much slower than his twin at

home”, It is clear that ageing will be slower

for a time traveller compared to his twin.

Thus, Option (d) is the correct answer.

48. Ans: (a)

Explanation: Total subtended angle at the

centre = 360°

Which means that 3.6° = 1%

% share of rubber alone =

= 30%

% share of bitumen and equipments =

= 32.5%

Difference =

× 15000000= Rs. 37,5000

= 0.375 million

49. Ans: (c)

Explanation:

1995 1996 1997 1998 1999 2000

Popula

tion (in lakhs)

13 14.5 17 18.4 19.1 20.7

Total

income (in

crores)

874 913 1123 1329 1411 1426

Per-

capita income

(in Rs.)

6723.

08

6296.

55

6605.

88

7222.

83

7387.

43

6888.

89

Maximum difference = 7387.43 - 6296.55 =

1090.88

% difference =

× 100=17.32%

50. Ans: (a)

Explanation:

At every point in time before T1, Q has

learned more than R has.

For E.g., at point Tx, Q has learned Lq and R

has learned Lr and Lq>Lr.

But at T1, R has caught up with Q. And at

every point in time after T1, R is ahead of Q

(drop a perpendicular from the endpoints of

R, and Q to get the time coordinates, and we

can see that Q took more time to cover the

same topics).

So, R started slower than Q in the beginning

but got ahead of Q to complete learning

calculus.

https://www.space.com/17661-theory-general-relativity.html

https://www.space.com/15830-light-speed.html

https://www.space.com/15830-light-speed.html


51. Ans: (b)

Explanation: In 24 hours:

Watch I → Loses 3 minutes

Watch II → Gains 2 minutes

So, exactly 24 hours after showing the same

time, they are now 5 minutes apart. Each day

the difference increases by 5 minutes, and

the watches will show the same time again

after 12 hours → 720 minutes.

In a day → 5 minutes

For a difference of 720 minutes →

=

144days

52. Ans: (d)

Explanation: 60 minutes or 1 hour = 360°

Each minute →

= 6°

A minute hand sweeps 6° every minute, while

the hour hand moves 360° in 12 hours (720

min).

So, every minute the hour hand sweeps →

0.5°

Difference = 6 - 0.5 = 5.5°

So, every minute the minute hand covers 5.5°

more than the hour hand.

At 8 am, the hands are 240° apart. Now, we

need to find the time at which the minute

hand has to lag behind the hour hand by 3

minutes

→ 18°

The difference must decrease by = 240 - 18 =

222°

Which means the minute hand has to cover

222°

Time taken will be =

= 40

minutes

53. Ans: (b)

Explanation: Every normal year has 365

days → 52 weeks + 1 odd day

Every leap year has 366 days → 52 weeks + 2

odd days

Count the number of odd days from the year

2037 onwards to get the sum equal to 7 odd

days.

Year 2037 2038 2039 2040 2041 2042

Odd

days

1 1 1 2 1 1

7 odd days have added up to a week and the

calendar of 2043 will be starting with the

same day of the week, and hence will have an

identical calendar.

54. Ans: (c)

Explanation: January 1, 2000 → Saturday

January 6, 2000 → Thursday (First Thursday

of the year)

January 13, 2000 → Thursday (Second of the

year)

Similarly, we only have to add 7 days to get

the next Thursday since it forms an AP, with

first-term = 6 and common difference = 7.

34th Thursday will be on = 6+(33 × 7) = 237th

day of the year.

237 = 31 + 29 + 31 + 30 + 31 + 30 + 31 + 24

So, the required day is the 24th day of the

8th month → August 24

55. Ans: (d)

Explanation:

F is sitting on the second seat from left.

_ F _ _ _ _

C is positioned at an equal distance from B

and E and and E is sitting towards the right

of B.

It can be done in 2 ways:

_ F B C E _

B F C _ E _

D is sitting at the right end of the row

Again, both of the options above are still

valid:

A F B C E D

B F C A E D

So, the final arrangement cannot be

determined with the information provided.

56. Ans: (a)

Explanation: There are as many people to

the right of B, as there are to the left of C.

A F B C E D

Is the only possible combination, and, as is

evident from the figure, E sits between C and

D.

57. Ans: (d)

Explanation: There are 53 people in a queue,

and 36 people standing in front of Kamal.


Which means that Kamal is the 37th in line

and there are 53-37=16 people standing

behind him in the queue.

Ronak is the 42nd person from the back of

the row → There are 41 people behind him in

the queue. So he‟s the 53 - 41 = 12th person

in line. So people in 13th to 36th positions

are standing between them.

From the information we have, we can say

that there are 36 - 13 + 1 = 24 people

between Ronak and Kamal.

58. Ans: (a)

Explanation: The capacity of the urn = 100 l

Remaining capacity after filling it with black

tea = 100 - 35 = 65 l

So, the quantity of milk tea in the urn = 65 l

% of milk in tea = 40%

Quantity of milk =

× 65 = 26 l → 26%

59. Ans: (c)

Explanation: Let the quantity of milk and

water in vessel A be → 2x and 3x (total 5x)

Let the quantity of milk and honey in Bessel

B be → 5y and 4y (total 9y)

So, let us take out 45 litres of solution from

both A and B.

Quantity of milk taken out from vessel A =

× 45=18l

Quantity of milk taken out from vessel B =

× 45=25l

Total % quantity of milk =

× 100

=

× 100 = 47

%

60. Ans: (d)

Explanation: We have to form a 6 digit

number using digit 0 to 8 (9 digits), and

without repetition.

Let's assume the 6 digit number → N1 N2 N3

N4 N5 N6

First, let us fix 5. It can occupy any of the 6

positions.

Fixing 5 at the place of N1 → Remaining 5

spots can be selected in 8 × 7 × 6 × 5 × 4 =

6720 ways.

Fixing 5 at the place of N2 → N1 can be

selected in 7 ways (1 to 8 except 5, because it

is already at the place of N2, and repetition is

no allowed) and the remaining 4 spots can be

selected in 7 × 6 × 5 × 4 ways. Total = 7 × 7 ×

6 × 5 × 4 = 5880 ways

Fixing 5 at the place of N3 → N1 can be

selected in 7 ways (1 to 8 except 5, because it

is already at the place of N3, and repetition is

no allowed) and the remaining 4 spots can be

selected in 7 × 6 × 5 × 4 ways. Total = 7 × 7 ×

6 × 5 × 4 = 5880 ways

We will get the same number of ways when 5

is fixed at N2, N3, N4, N5, and N6 → 5880

Total number of ways = (5 × 5880)+6720 =

36120

61. Ans: (c)

Explanation: If there are 2 teams (say A, and

B) in the group, and each team play each

other exactly once → there will only be 1

match (A v B) → 1

If there are 3 teams (A, B, and C), and each

team plays against each other once → There

will be 3 matches (A v B, B v C, A v C) → 1+2

If there are 4 teams (A, B, C, and D), and

each team plays against each other once →

There will be 6 matches → 1+2+3

In general → No. of matches in group is there

are n teams → 1+2+3+...+(n-1) =

Now, the no. of matches is given as 28 →

=28

n(n-1)=28 × 2=56 → n = 8

62. Ans: (c)

Explanation:

Number of Pokemon toys = 17

Number of Lego toys = n-5 = 12

Total number of toys = 17 + 12 + (17+3) = 49

Probability of drawing a Lego toy =

63. Ans: (b)

Explanation:

Probability of rolling 6 → 16

Probability of rolling exactly one 6 → one 6

and 2 non 6.

Required probability =

3C2 (

) =

=

Percentage probability =

× 100 = 34.72%


64. Ans: (c)

Explanation: Let the length of the field be l,

and let the width of the field be b.

Original area will be, A = l × b

New length = l × (

) = 1.3l

New width = b × (

) =0.85b

New area = 1.3l × 0.85b = A × (1.3 × 0.85) =

A ×

×

=

A

New area is greater than the original area by

A - A =

A

% difference =

× 100=10.5%

65. Ans: (b)

Explanation:

The pole makes 90 degrees with the ground.

Applying Pythagoras theorem, Length CB, x =

√ = √ = 25m

Height of the pole AB = AC+CB = 24 + 25 = 49

m

So, the answer is Option (b).

66. Ans: (d)

Explanation:

Inference 1 is incorrect.

It is mentioned in the passage that the

salaries of teachers in Thailand and Scotland

are aligned with comparable professions, but

we cannot infer that the high salary is the

main reason for people choosing that

profession in those countries with the given

data.

Hence the inference is incorrect.

Inference 2 is incorrect.

The passage does say that teachers in

Ethiopia find it difficult to make a living with

their salary, however, the cost of living in that

country is not discussed in the passage hence

such an inference cannot be made.

Hence the inference is incorrect.

67. Ans: (d)

Explanation:


In the passage, the author used the phrase

“the relationship has matured from the still

unsure stage of adolescence to confident

adulthood‟ the author is trying to imply that

the diplomatic relationship is still in its early

stage and it is growing well as time passes.

The explanation given in the statement is not

what the author intended from the usage of

the phrase hence it is wrong.


Refer to these lines, “The relationship is now

moving steadily and at a more brisk pace,

under the stewardship of our leaders, and

developing a solid foundation for the future.‟

Here the author is implying that the strong

foundation for future relations is being built,

due to the efforts of their respective leaders.


68. Ans: (a)

Explanation:

Option d is incorrect.

Refer to this line, “Government alone cannot

always take on the full responsibility for

„providing‟ water supply and sanitation

services to all citizens, especially in low-

income settings.“

The above line doesn‟t mean that the

government has no responsibility to ensure

water to the public, it means the government

does not have to assume the full

responsibility in this matter.

But the passage doesn‟t talk about the

government alone, it involves other

stakeholders as well.

Hence it is incorrect and not the message the

author tries to deliver.

Option b is not discussed in the passage, as

there is no comparison given the passage over

who can provide a better service to the

people, so that option can be discarded.


Option c is discussed in the passage is these

lines, “When governments‟ role is geared

towards policy setting and regulation, “, “

Large corporations can also have a great deal

of influence over policy-making as well as

policy outcomes.“

Here large corporations are a factor in

policymaking and outcome but it is not

mentioned in the passage that they will

benefit from these policies.


Option a is correct.

Refer to this line, “Creating coherence

between the various institutional levels is

essential to ensure that policies deliver on

their objectives.”

The author in the 2nd passage has explained

that the government cannot assume full

responsibility to ensure water supply for all,

and in the last passage the author explains

how NGOs and corporations can act on behalf

of the government to carry out their policies.

So this coupled with the opening sentence of

the last paragraph indicates the author's

message that is the author wants all these

institutions to work in harmony to achieve

the desired goal.

69. Ans: (c)

Explanation:


Refer to these lines, “Colors are important in

both identifying objects, i.e., in locating them

in space, and in re-identifying them.“

The statement is a direct interpretation of

this line.



Refer to these lines, “So much of our

perception of physical things involves our

identifying objects by their appearance, and

colours are typically essential to an object‟s

appearance, that any account of visual

perception must contain some account of

colours.”

From these lines, the author has made it

evident that colors are important as our

perception of objects is dependent on it.


70. Ans: (b)

Explanation:

Statement 1 is correct,

Refer to this line, “Proven, cost-effective

actions include increasing taxes on alcoholic

drinks, bans or restrictions on alcohol

advertising, and restricting the physical

availability of alcohol.”

In these lines it is stated that bans or

restrictions on alcohol advertising is a proven

action, also the last line says more than half

the countries have some sort of ban on

advertisements and it further supports the

point.



Refer to this line, “Almost all (95%) countries

have alcohol excise taxes, but fewer than half

of them use other price strategies such as

banning below-cost selling or volume

discounts.”

We can understand that many countries are

using this strategy to counter and reduce the

usage of alcohol, but it is not mentioned in

the passage that earning additional money

through taxes is the objective of the

government. So that statement cannot be

validated from the passage.


71. Ans: (c)

Explanation: The passage does explain youth

bulge in a country and its effects, however,

none of the points in the passage warrants a

need for population control neither is it

discussed in the passage. Hence Option (a) is

incorrect.

Throughout the passage, the author is

explaining how the youth bulge can benefit

the country on many fronts, however, refer to

these lines, “If human capital investment falls

short or if the labour market is unable to

absorb new workers, the opportunity deriving

from this demographic dividend may be

squandered. „“

Here the author states that merely having a

youth bulge will not suffice, the government

should take steps to utilize it otherwise it will

go to waste.

So the message in Option (b) is not correct

and Option (c) best sums up the passage.


Option (d) cannot be the message the author

intended to pass, as the author has not

discussed such a statement and was saying

how improper management from the

government will lead to a loss of opportunity

and he‟s not blaming the younger population

for it in any way.


72. Ans: (a)

Explanation:


This statement can be derived from reading

these lines, “Substandard working conditions

are the main issue, underscoring the central

role that decent and productive employment

plays in helping people escape poverty.”



Refer to these lines, “Progress in reducing

working poverty has slowed over the past five

years, suggesting that efforts in this area

need to be reinvigorated.“ and “Employed

young people are more likely to be living in

poverty, with a working poverty rate that is

double that of adult workers.“

From the first line, it is evident that the

progress made in reducing working poverty

has slowed and the efforts should be

reinvigorated, and from the 2nd line, we can

understand that young workers are more

likely to be living in poverty than adults.

However, from the limit of the passage, we

cannot make the assumption that more focus

should be on younger workers than adults as

there is no direct connection established

between these two lines.


73. Ans: (a)

Explanation: According to the author,

Raising Animals for food is extremely

inefficient. Throughout the passage, he is

trying to explain the reasons to substantiate

the same.

74. Ans: (c)

Explanation: When Option (b) is a point

which is not discussed in the passage,

options (a) and (d) are some examples given in

the passage. However, Option (c) conveys the

main idea of “Wheel of Emotions”.

75. Ans: (b)

Explanation: Options a, c and d are

sentences taken directly from the passage

and are true. However, Option (b) directly

contradicts the statement, “there are no

absolutes in Shinto”.

76. Ans: (d)

Explanation: Using the information given the

Venn diagram can be drawn as:

As we can see none of the conclusion can be

drawn

77. Ans: (d)

Explanation: Using the information given the

Venn diagram can be drawn as

As we can see from the diagram none of the

conclusions follow

78. Ans: (c)

Explanation: Using the information given

Venn diagram can be drawn as


We can draw both conclusions from the Venn

diagram

79. Ans: (c)

Explanation:

WORD → DOID

PROM → KRLM

Letters in even places are the same, while

letters in odd places are the opposite of the

original letter (W is the 23rd letter in

alphabetical order and D is 23rd in reverse

alphabetical order. Similarly, R is the 18th

letter in alphabetical order, while I is the 18th

letter in reverse alphabetical order).

The second and last letters will be O, and M

itself. D (the first letter of DORM) is the 4th

letter in alphabetical order, and hence, the

first letter in the coded form will be 4th letter

in reverse alphabetical order → W

So,

DORM → WOIM is the correct code.

80. Ans: (a)

Explanation:

Step I - Reverse the word (SPLIT → TILPS;

TRUMP → PMURT)

Step II - Replace each alphabet with the

preceding alphabet (-1) to get the code (TILPS

→ SHKOR; PMURT→ OLTQS)

Similarly,

(I) PROMPT → TPMORP

(II) TPMORP → SOLNQO

ALL INDIA PRELIMS TEST SERIES - 2020...1 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes:...

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