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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.
Hence the statement is correct.
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.
Hence the statement is incorrect.
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
2 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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:
Statement 1 is incorrect.
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.
Statement 2 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:
Statement 1 is incorrect.
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.
Hence the statement is correct.
Statement 3 is correct.
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.
Hence the statement is correct.
7. Ans: (c)
Explanation:
Statement 1 is correct.
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.
Hence the statement is correct.
Statement 2 is correct.
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.”
3 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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.
Hence the statement is correct.
8. Ans: (a)
Explanation:
Statement 1 is incorrect.
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.
Hence it is incorrect.
Statement 2 is correct.
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.
Hence the statement is correct.
9. Ans: (d)
Explanation:
Statement 1 is incorrect.
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.
Statement 2 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.
Hence the statement is incorrect.
10. Ans: (a)
Explanation:
Statement 1 is correct.
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
Statement 2 is incorrect.
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
4 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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
5 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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
6 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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
7 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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:
Statement 1 is incorrect.
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.
Hence it is incorrect.
Statement 2 is correct.
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.
Hence the statement is correct.
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:
Statement 1 is incorrect.
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.
Statement 2 is incorrect.
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.
8 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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:
Statement 1 is incorrect.
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.
Hence the statement is incorrect.
Statement 2 is correct.
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.
Hence the statement is correct.
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:
Statement 1 cannot be inferred.
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.
Statement 2 cannot be inferred.
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.”
9 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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.
10 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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.
11 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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%
12 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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:
Statement 1 is incorrect.
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.
Statement 2 is correct.
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.
Hence the statement is correct.
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.
13 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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.
Hence the statement is incorrect.
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:
Statement 1 is correct.
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.
Hence it is correct.
Statement 2 is correct.
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.
Hence it is correct.
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.
Hence it is correct.
Statement 2 is incorrect.
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.
Hence the statement is incorrect.
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.
14 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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.
Hence it is incorrect.
72. Ans: (a)
Explanation:
Statement 1 is correct.
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.”
Hence it is correct.
Statement 2 is incorrect.
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.
Hence it is incorrect.
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
15 AIPTS 2020 (CSAT - 19) (E) Answer Key Byju’s Classes: 9873643487
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