UPSC Previous Year Questions (CSAT)

UPSC Previous Year Questions (CSAT)

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Day 1 - (23 April 2024)

Q.1) A group of 630 children is seated in rows for a group photo session. Each row contains three less children than the row in front of it. Which one of the following number of rows is not possible? (2014)

(a) 3
(b) 4
(c) 5
(d) 6

Solution: (d)

Let no of children be x,  x + 3, x + 6, x+ 9, x +12, x+ 15 ...........
And these children are in Rows - R1, R2, R3, R4, R5, R6….

Rows given as 3, 4, 5, 6.. So putting these values-
When R = 3;
x+x+3+x+6 = 630; 3x+9= 630; 3x= 621; x= 207

When R = 4;
x+x+3+x+6+x+9= 630; 4x+18= 630; 4x= 612; x= 153

When R= 5;
x+x+3+x+6+x+9+x+12= 630; 5x+ 30= 630; 5x= 600; x= 120

When R = 6;
x+x+3+x+6+x+9+x+12+x+15 = 630; 6x+45 = 630; 6x = 585; X = 97.5

Because x is not an integer. So, R = 6 is the answer.


Q.2) If Sohan while selling two goats at the same price , makes a profit of 10% on one goat and suffers a loss of 10% on the other one (2014)

(a) He makes no profit, no loss. 
(b) He makes a profit of 1%.
(c) He suffers a loss of 1%.
(d) He suffers a loss of 2%.

Solution: (c)

If profit and loss percent on two different items is equal, then there will always be a loss.
Simply putting values in the formula - we get
% final loss = (%loss * % gain)/ 100 = (10 * 10/ 100) = 1% loss.


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Day 2 - (24 April 2024)

Q.3) In a row β€˜A’ is in the 11th position from the left and B is in the 10th position from the right. If β€˜A’ and β€˜B’ interchange then A becomes 18th from the left. How many persons are there in the row other than A and B ? 
(2014)

(a) 27
(b) 26
(c) 25
(d) 24

Solution: (c)

No. of students between A and B in the 1st arrangement = 17 - 11 = 6.
Total no. of students except A and B is  = 10 + 6 + 9 = 25


Q.4) Location of B is north of A and the location of C is east of A. The distances AB and AC are 5 km and 12 km respectively. The shortest distance in km between the locations B and C is- (2014)

(a) 60
(b) 13
(c) 17
(d) 7

Solution: (b)

To find the distance between B and C, a right triangle is considered where AB and AC are the sides and BC is the hypotenuse. 

Applying the Pythagorean theorem, the shortest distance BC is found to be 13 km.



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Day 3 - (25 April 2024)

Q.1) Five persons fire bullets at a target at an interval of 6, 7, 8, 9 and 12 seconds, respectively. The number of times they would fire the bullets together at the target in an hour is - (2014)

(a) 6
(b) 7
(c) 8
(d) 9

Solution: (b)

To find out the time gap after which they will first hit the target, calculate the LCM of 6 7 8 9 12.

LCM = 504 sec
∴  In 1 hr = 3600 sec
No. of time they will hit together is 3600/504 = 7 times in an hour.


Q.2) There are seven persons up on a ladder A B C D E F and G not in that order. A is further up than E but is lower than C. B is in the middle. G is between A and B. E is between B and F. If F is between E and D the person on the bottom step of the ladder will be - (2014)

(a) B
(b) F
(c) D
(d) E

Solution: (c)

As per the given information, B is in the middle.

Other information -
A is further up than E but is lower than C. 
G is between A and B. 
E is between B and F. 
F is between E and D.

This means that there is a vacancy in between A and B.

If A is two steps above B, G will be on the 5th step from bottom and C will be on the top most step. The resulting arrangement is-

Hence, D is on the last step.


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Day 4 - (26 April 2024)

Q. 1 A worker reaches his factory 3 minutes late if his speed from his house to the factory is 5 km/hr If he walks at a speed of 6 km/hr, then he reaches the factory 7 minutes early. The distance of the factory from his house is- 
(2014)

(a) 3 km
(b) 4 km
(c) 5 km
(d) 6 km

Solution: (c)

Let the distance be x km,
x/5 - 3/60 = x/6 + 7/60
x/5 - x/6 = 10/60
x/30 = 1/6
x = 5 km


Q.2 Liberty therefore is never real unless the Government can be called to account when it invades rights. 

Which one of the following is the best justification of the above statement ?
(2014) 

(a) In the realization that the government can be brought to book in a court of law.

(b) In identifying a man as a political unit in a way which distinguishes him from other citizens.

(c) In a decentralized society wherein the basic needs of men can find satisfaction.

(d) In the understanding that liberty and restraints are complementary.

Solution: (d)

  • In the understanding that liberty and restraints are complementary is the statement which best explains why Liberty therefore is never real unless the Government can be called to account when it invades rights. 

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Day 5 - (27 April 2024)

Q. 1 If the third day of a month is Monday, then which day of the week will be the fifth day from the 21st of that month? (2014)

(a) Monday
(b) Tuesday
(c) Wednesday
(d) Friday

Solution: (c)

3rd day β‡’ Monday 
10th day β‡’ Monday 
17th day β‡’ Monday 
24th day β‡’ Monday 

Fifth day from the 21st is the 26th day.  
So the 26th day is Wednesday.


Q. 2 For a charity show, the total tickets sold were 420. Half of these tickets were sold at the rate of Rs. 5 each, one-third at the rate of Rs. 3 each and the rest for Rs.2 each. What was the total received?  (CSE 2014)

(a) Rs. 900
(b) Rs.1540
(c) Rs.1610
(d) Rs.2000

Solution: (c)

Total tickets sold  = 420
Half of the tickets sold at the rate of Rs. 5 each.
Therefore, 210 tickets sold  = 210 Γ— 5 = Rs 1050
One third ticket sold for Rs. 3 i.e  1/3  of 420 = 140 tickets sold at Rs. 3 each.

Collection through it  = 140 Γ— 3 = Rs 420
The Remaining 70 tickets were sold at the rate of Rs. 2 each.
So collection  = 70 Γ— 2 = Rs 140
Total collection  = 1050 + 420 + 140 = 1610.



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Day 6 - (29 April 2024)

Q.1 Two cars start towards each other, from two places A and B which are at a distance of 160 km. They start at the same time, 8:10 AM. If the speeds of the cars are 50 km and 30 km per hour respectively, they will meet each other at- (2014)

(a) 10:10 AM
(b) 10:30 AM
(c) 11:10 AM
(d) 11:20 AM

Solution: (a)

A --------------------X km--------------P -------------- (160βˆ’X) km-----------------B

Speed of B= 30 kmph

Let time taken to meet at point P Is the same as both trains started at the same time . Now, 
Time taken to travel X km by A=X/50 .........(i)
Time taken to travel (160βˆ’X) km by B=(160βˆ’X)/30 ............(ii)

Comparing equation (i) and (ii), we have
X/50 = (160βˆ’X)/30 β‡’ 3X=800βˆ’5X β‡’8X=800 β‡’X=100 km

Time taken by A to travel 100 = 100/50=2 hours.
So, they will meet each other at 10:10 AM.


Q.2 Four persons Alok, Bhupesh, Chander and Dinesh have a total of Rs.100 among themselves. Alok and Bhupesh between them have as much money as Chander and Dinesh between them but Alok has more money than Bhupesh; and Chander has only half the money that Dinesh has. Alok has in fact Rs.5 more than Dinesh has. Who has the maximum amount of money? (2014)

(a) Alok 
(b) Bhupesh 
(c) Chander 
(d) Dinesh

Solution: (a)

Alok + Bhupesh + Chander + Dinesh = Rs.100 
Alok + Bhupesh = Chander + Dinesh 
OR
Alok + Bhupesh = Chander + Dinesh = Rs.50

Also, 2Chander = Dinesh 
Chander = Rs 16.67
Dinesh = Rs 33.33
Alok = 33.33 + 5 = 38.33
Bhupesh = 50 - 38.33 = Rs 11.67

So, Alok has the highest amount of money.


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Day 7 - (30 April 2024)

Q. 1 The letters L, M, N, O, P, Q, R, S and T in their order, are substituted by nine integers 1 to 9 but not in that order. 4 is assigned to P. The difference between P and T is 5. The difference between N and T is 3. What is the integer assigned to N? (2014)

(a) 7
(b) 5
(c) 4
(d) 6

Solution: (d)

Given that P = 4 and T - P = 5 
Also, T - N = 3.
Now, T - P = 5; T - 4 = 5; T = 9
And, 9 - N = 3; N = 6.
So N = 6.


Q.2 The number of deaths among the army personnel is 8 in 1000 but among the civilian population it is 20 per 1000. Which one of the following inferences can be drawn from this statement? (2014)

(a) It is better to join the army. 
(b) The relationship is fortuitous. 
(c) The Quality of Life Index is very high within the armed forces. 
(d) The groups cannot be compared due to their heterogeneity.

Solution: (d)

  • Army personnel go through training and are generally fit. While civilians are diverse which includes all age groups.
  • Thus both are heterogenous and cannot be compared.

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Day 8 - (1 May 2024)

Q.1 A and B decide to travel from place X to place Y by bus. A has Rs.10 with him and he finds that it is 80% of the bus fare for two persons. B finds that he has Rs. 3 with him and hands it over to A. In this context  which one of the following statements is correct ? (CSE 2014)

(a) Now the money A has is just enough to buy two tickets. 
(b) A still needs Rs2 for buying the tickets. 
(c) After buying the two tickets A will be left with 50 paise. 
(d) The money A now has is still not sufficient to buy two tickets.

Solution: (c)

A has Rs 10, and if B gives Rs.3 to A, now A has Rs.13  
Cost of 2 tickets = 80% of x = 10
x= Rs 12.50

So, A is left with Rs.13 – 12.50 = 50 paise.


Q.2 As per agreement with a bank a businessman had to refund a loan in some equal installments without interest. After paying 18 installments he found that 60 percent of his loan was refunded. How many installments were there in the agreement ?   (CSE 2014)

(a) 22 
(b) 24 
(c) 30 
(d) 33

Solution: (c)

Let the amount in each installment be x 
And total amount be a 

Number of installments =  Total amount / Amount in each installment
18 = (60/100) Γ— a / x
18x = (60/100) x a
(18 Γ— 100)/60 = (a/x) 
a/x = 30 
∴ Number of installments are 30


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Day 9 - (2 May 2024)

Q.1 Consider that- 

  1. A is taller than B
  2. C is taller than A.
  3. D is taller than C.
  4. E is the tallest of all.   (CSE 2014)

If they are made to sit in the above order of their height, who will occupy the mid position?

(a) A 
(b) B 
(c) C 
(d) D

Solution: (c)

  • The sequence as per data-

Thus β€˜C’ occupies the mid position.


Q.2 Consider the following statements-

There are six villages A B C D E and F. 

  1. F is 1 km to the west of D. 
  2. B is 1 km to the east of E. 
  3. A is 2 km to the north of E. 
  4. C is 1 km to the east of A. 
  5. D is 1 km to the south of A.  (CSE 2014)

Which three villages are in a line ? 

(a) A C B 
(b) A D E 
(c) C B F 
(d) E B D

Solution: (b)

  • Drawing a diagram based on the statements given.

Hence ADE are in a line.


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Day 10 - (3 May 2024)

Q.1 Four children are sitting in a row. A is occupying the seat next to B but not next to C. If C is not sitting next to D, who is/are occupying seat/seats adjacent to D ?   (CSE 2014)

(a) B
(b) A 
(c) B and A 
(d) Impossible to tell

Solution: (b)

Exp: The description is used to draw the following arrangement.

Thus option b is correct.


Q.2 Assume that-

  1. The hour and minute hands of a clock move without jerking. 
  2. The clock shows a time between 8 o'clock and 9 o'clock. 
  3. The two hands of the clock are one above the other. 

After how many minutes (nearest integer) will the two hands be again lying one above the other? (CSE 2014)

(a) 60
(b) 62
(c) 65
(d) 67

Solution: (c)

When the minute hand travels 60 minutes, the hour hand only travels 5 minutes.

The relative time between both hands = 60 - 5 = 55 minutes.
They would meet again after = 60/55 = 1.09 hours 
1.09 hours = 1.09 Γ— 60 = 65.4 minutes. 
They would meet again after 65 minutes.



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Day 11 - (4 May 2024)

Q.1 Twelve people form a club. By picking lots one of them will host a dinner for all once in a month. The number of dinners a particular member has to host in one year is- (CSE 2014)

(a) One 
(b) Zero 
(c) Three 
(d) Cannot be predicted

Solution: (d)

  • We cannot predict the number of dinners for a particular member from the given data.
  • It is a possibility that by choosing members from picking lots, one may have to host a dinner more than once.

Q.2 What is the missing number in the series 7 X 21 31 43 ? (CSE 2014)

(a) 11
(b) 12
(c) 13
(d) 14

Solution: (c)

The difference increases by 2 units in each step.
7 + 6 = 13 
13 + 8 = 21 
21 + 10 = 31 
31 + 12 = 43

Thus 13 is the missing number.


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Day 12 - (6 May 2024)

Q.1 In a test, a candidate attempted only 8 questions and secured 50% marks in each of the questions. If he obtained a total of 40% in the test and all questions in the test carried equal marks, how many questions were there in the test?   (CSE 2014)

(a) 8
(b) 10
(c) 15
(d) 16

Solution: (b)

Let each question carry x marks
The equation becomes-
8x * 50/100 = 40
x = 40/4
x = 10
Thus the number of questions in the test = 10 


Q.2 A father is nine times as old as his son and the mother is eight times as old as the son. The sum of the father's and the mother's age is 51 years. What is the age of the son? (CSE 2014)

(a) 7 years 
(b) 5 years 
(c) 4 years 
(d) 3 years 

Solution: (d)

Sum of father's age and mother's age = 51 years 

Let the age of the son is x 
Father’s age = 9x  and mother’s age  = 8x
So, 9x + 8x = 51 years 
β‡’ 17x = 51 years 
β‡’ x = 3 years 
The age of the son is 3 years.


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Day 13 - (7 May 2024)

Q.1 Four persons A B C and D consisting of two married couples are in a group. Both the women are shorter than their respective husbands. A is the tallest among the four. C is taller than B. D is B's brother. In this context which one of the following statements is not correct ? (CSE 2015)

(a) All four have family ties. 
(b) B is the shortest among the four. 
(c) C is taller than D. 
(d) A is B's husband.

Solution: (c)

Given information- A is the tallest among the four. Hence A is male.
D is also male as D is the brother of B. 
Thus B and C are females. 
D is the husband of C. 
D is shorter than A but is taller than B. 

Thus B is shorter from above. Thus option c is incorrect.


Q.2 If A runs less fast than B and B runs as fast but not faster than C; then as compared to A, C runs-  (CSE 2015)

(a) Slower than A 
(b) Faster than A 
(c) With same speed as A 
(d) Given data is not sufficient to determine

Solution: (b)

As per information, relative speeds give following inference- A < B < C
Now compared to A, C runs faster.


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Day 14 - (8 May 2024)

Q.1 Consider the following statements:

  1. A man had a wife, two sons and daughters in his family.
  2. The daughters were invited to a feast and the male members of the family went out to take part in a picnic.
  3. The man's father did not return from his work. (CSE 2014)

Which of the following statements is true?

(a) Only the man's wife was left at home
(b) It is likely that the man's wife was left at home
(c) None was left at home
(d) More than one person was left at home

Solution: (b)

  • It is given that all the male members of the family went out to take part in a picnic.
  • Also, daughters were invited to a feast. But nothing is specified about the man's wife.
  • Hence (b) statement that the man’s wife is likely to be left at home is true.

Q.2 Geeta: Naresh has become a better boxer since he started meditation. 

Radha: Impossible. A boxer's most important asset is his aggressiveness. 

Radha’s statement reflects her belief that-  (CSE 2014)

(a) Meditation tends to make a person less aggressive. 
(b) Meditation has little or no effect on the person who practices it. 
(c) Naresh was a poor boxer earlier because he was not aggressive enough. 
(d) Naresh would not have taken to meditation as he was a boxer.

Solution: (a)

  • Radha did not accept the opinion that meditation makes a person a better boxer because boxing requires aggressiveness.
  • Which implies that Radha believes that meditation makes a person less aggressive.

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Day 15 - (9 May 2024)

Q.1 All good athletes want to win and all athletes who want to win eat a well-balanced diet; therefore all athletes who do not eat a well-balanced diet are bad athletes. The best conclusion from this statement is that

(a) No bad athlete wants to win. 
(b) No athlete who does not eat a well-balanced diet is a good athlete. 
(c) Every athlete who eats a well-balanced diet is a good athlete. 
(d) All athletes who want to win are good athletes.

Solution: (b)

The given statements can be seen as:

  • All good athletes want to win.

It does not mean that no one wants to win. Also, there can be people other than good athletes who eat a well balanced diet. Hence b is true. 


Q.2 Each of A, B, C and D has Rs.100. A pays Rs. 20 to B who pays Rs.10 to C who gets Rs. 30 from D. In this context, which one of the following statements is not correct? 

(a) C is the richest 
(b) D is the poorest. 
(c) C has more than what A and D have together. 
(d) B is richer than D

Solution: (c)

According to question A B C and D each carry Rs.100. After the given transactions,
A has Rs 80
B has Rs 110
C has Rs 140
D has Rs 60

Here option c is not correct because C has more than what A and D have together.



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Day 16 - (10 May 2024)

Q.1 In a town, 45% of the population read magazine A, 55% read magazine B, 40% read magazine C, 30% read magazines A and B, 15% read magazines B and C, 25% read magazines A and C and 10% read all the three magazines. What percentage do not read any magazine? (CSE 2015)

(a) 10% 
(b) 15% 
(c) 20% 
(d) 25%

Solution: (c)

Number of population who read the magazine= 45 + 55 + 40 – 30 + 25 +15 + 10
= 140 – 70 + 10= 80%
Number of population who do not read magazine = 100 – 80 = 20%


Q.2 Examine the following statements: (CSE 2015)

  1. Lady finger is tastier than cabbage. 
  2. Cauliflower is tastier than lady finger. 
  3. Cabbage is not tastier than peas. 

The conclusion that can be drawn from these statements is that-

(a) Peas are as tasty as lady fingers.
(b) Peas are as tasty as cauliflower and lady-finger. 
(c) Cabbage is the least tasty of the four vegetables. 
(d) Cauliflower is tastier than cabbage.

Solution: (c)

As per given information, Cauliflower > Lady finger > Cabbage.
Also, Peas > Cabbage. So, cabbage is the least tasty among the four vegetables.


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Day 17 - (11 May 2024)

Q.1 Shahid and Rohit start from the same point in opposite directions. After each 1 km Shahid always turns left and Rohit always turns right. Which of the following statements is correct ? (CSE 2015)

(a) After both have traveled 2 km the distance between them is 4 km. 
(b) They meet after each has traveled 3km. 
(c) They meet for the first time after each has traveled 4 km. 
(d) They go on without ever meeting again.

Solution: (b)

Let's understand with a diagrammatic representation-

Their positions after each traveled as per given directions shows that both meet after having traveled 3 km.


Q.2 In a 500 meters race, B starts 45 meters ahead of A but A wins the race while B is still 35 meters behind. What is the ratio of the speeds of A to B assuming that both start at the same time? (CSE 2015)

(a) 25: 21 
(b) 25: 20 
(c) 5:3 
(d) 5:7

Solution: (a)

Total distance = 500 meter
Distance covered by A= 500 meter
Distance covered by B = 500 – 45 – 35 = 500 – 80 = 420
Ratio= 500:420 = 25:21


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Day 18 - (13 May 2024)

Q.1 Two equal glasses of the same type are respectively 1/3 and 1/4 full of milk. They are then filled up with water and the contents are mixed in a pot. What is the ratio of milk and water in the pot? 

(a) 7 : 17 
(b) 1 : 3 
(c) 9 : 21 
(d) 11 : 23

Solution: (a)

Let the capacity of each of the glass be x liter.
Then, Each glass contains x/3l and x/4l of milk. 
Therefore- x/3 + x/4 = 4x+3x/ 12 = 7x/10 liter

So, the quantities of water in the first and the second glasses were 
(x-x/3)liter and (x-x/4)liter

After simplifying, 2x/3 + 3x/4 = 8x+9x/12 = 7x/12
The ratio of milk and water is = 7x/12 : 17x/12 = 7:17


Q.2 Out of 130 students appearing in an examination, 62 failed in English, 52 failed in Mathematics, whereas 24 failed in both English and Mathematics. The number of students who passed finally is-  

(a) 40 
(b) 50 
(c) 55 
(d) 60

Solution: (a)

Total students = 130
Total students failed = 62 + 52 – 24= 114 – 24= 90
Number of students passed finally = 130 – 90 = 40


Day 19 - (14 May 2024)

Q.1 In a group of persons traveling in a bus, 6 persons can speak Tamil, 15 can speak Hindi and 6 can speak Gujarati. In that group none can speak any other language. If 2 persons in the group can speak two languages only and one person can speak all the three languages then how many persons are there in the group?  (CSE 2015)

(a) 21 
(b) 22 
(c) 23 
(d) 24

Solution: (c)

Let a be the one who speaks one language 
Let b be the one who speaks two languages
Let c be the one who speaks three languages,

Then 
a + 2b + 3c = 6 +15 +6 
a + 4 + 3 = 27 
a = 20.

Thus total number of persons in the group = 20 + 2 + 1 = 23.


Q.2 In a parking area, the total number of wheels of all the cars (four-wheelers) and scooters/motorbikes (two wheelers) is 100 more than twice the number of parked vehicles. The number of cars parked is - (CSE 2015)

(a) 35 
(b) 45 
(c) 50 
(d) 55

Solution: (c)

Let number of cars be x
Let number of scooters / motorbikes = y
So, total number of parked vehicles = x + y
Now according to question, 4x + 2y = 2 x + y + 100; 
4x + 2y = 2x + 2y + 100; 
2x = 100x = 50

Hence the number of cars parked is 50.


Day 20 - (15 May 2024)

Q.1 The mangroves can shed tons of leaves per acre every year; fungi and bacteria break down this leaf litter and consume it, they then are consumed by tiny worms and crustaceans which in turn feed small fish which feed larger fish and birds and crocodiles. Which among the following is the most logical inference of the above statement? (CSE 2015)

(a) Coastal areas cannot have food chains without mangroves. 

(b) Mangroves are an essential component of all marine ecosystems. 

(c) Mangroves have a crucial role in some of the coastal food chains. 

(d) The composition of marine flora and fauna is largely determined by mangroves.

Solution: (c)

  • The passage indicates the role Mangroves play in some of the coastal food chains. There are many other food chains that might exist with or without Mangroves. So, (c) is correct. 

Q.2 By liberty I mean the eager maintenance of that atmosphere in which men have the opportunity to be their best selves. Which one of the following expresses the view implied in the above statement?  (CSE 2015)

(a) Liberty is the absence of restraint on human action. 

(b) Liberty is what law permits people to perform. 

(c) Liberty is the ability to do what one desires. 

(d) Liberty is the maintenance of conditions for the growth of human personality.

Solution: (d)

  • As per the option A, liberty means the eager maintenance of that atmosphere which might require restrictions as well which makes it wrong. 
  • Option b says that if the people work only according to the law they might become good citizens but might not work to their best selves thus it is wrong.
  • Option c is wrong because it promotes materialist thinking which is not the best self. 
  • Option d is correct because with the growth of human personality the people would be their best selves.


Day 21 - (16 May 2024)

Q.1 A selection is to be made for one post of Principal and two posts of Vice-Principal. Amongst the six candidates called for the interview only two are eligible for the post of Principal while they all are eligible for the post of Vice-Principal. The number of possible combinations of selectees is- (CSE 2015)

(a) 4 
(b) 12 
(c) 18 
(d) None of the above

Solution: (d)

As per given data, 
Number of ways to select Principal = 2C1 
Number of ways to select Vice Principal = 5C2 
Total number of ways = 2C1 + 5C2 
Number of possible combinations of selectres = 2 Γ— 10 = 20


Q.2 A student has to opt for 2 subjects out of 5 subjects for a course namely Commerce, Economics, Statistics, Mathematics I and Mathematics II. Mathematics II can be offered only if Mathematics I is also opted. The number of different combinations of two subjects which can be opted is-   (CSE 2015)

(a) 5 
(b) 6 
(c) 7 
(d) 8

Solution: (c)

If mathematics I is not opted, then two subjects out of four subjects have to be opted.

∴ Number of ways in which two subjects can be opted If mathematics II is opted because it can be opted only if mathematics I is also opted.

Number of ways in which two subjects can be opted for = 6 +1 = 7.


Day 22 - (17 May 2024)

Q.1 A person ordered 5 pairs of black socks and some pairs of brown socks. The price of a black pair was thrice that of a brown pair. While preparing the bill, the bill clerk interchanged the number of black and brown pairs by mistake which increased the bill by 100%. What was the number of pairs of brown socks in the original order? (CSE 2015)

(a) 10 
(b) 15 
(c) 20 
(d) 25

Solution: (d)

Suppose, The number of a pairs of brown socks = y 
Price of brown socks = x 
So the price of black socks = 3x 

As per the question β‡’ 5 * 3x + xy = 100  
If the price is increased by 100%
So the pairs of brown socks = 25


Q.2 The number of persons who read magazine X only is thrice the number of persons who read magazine Y. The number of persons who read magazine Y only is thrice the number of persons who read magazine X. Then which of the following conclusions can be drawn? 

1. The number of persons who read both the magazines is twice the number of persons who read only magazine X. 

2. The total number of persons who read either one magazine or both the magazines is twice the number of persons who read both the magazines.  (CSE 2015)

Select the correct answer using the code given below: 

(a) 1 only 
(b) 2 only 
(c) Both 1 and 2 
(d) Neither 1 nor 2

Solution: (c)

Understanding and solving with a venn diagram. 

Number of people who read only magazine X = A
Number of people who read only magazine Y = C
Number of people who read both magazines = B
Thus, 3A = B + C and 3C = B + A

Substituting wrt B;
3A - C = 3C - A
4A = 4C
A = C

Substituting A = C in the first two equations, B = 2A = 2C = A + C

The number of people who read both the magazines are twice the number of people who read only magazine X.
The number of people who either read only one magazine or both magazines
= B + (A + C) =  B + B = 2B

Therefore, the total number of people who either read one magazine or both magazines is twice the number of persons who read both magazines.

Both conclusions are true.


Day 23 - (18 May 2024)

Q.1 Each of the six different faces of a cube has been coated with a different color i.e. V I B G Y and O. Following information is given:  (CSE 2015)

  1. Colors Y O and B are on adjacent faces. 
  2. Colors I G and Y are on adjacent faces. 
  3. Colors B G and Y are on adjacent faces.
  4. Colors O V and B are on adjacent faces. 

Which is the color of the face opposite to the face coloured with O? 

(a) B 
(b) V 
(c) G 
(d) I

Solution: (c)

From statements 2 and 3, I and B are on opposite faces. 
From statements 1 and 4, Y and V are adjacent to O.
Therefore, G is the color of the face opposite to the face coloured with O.


Q.2 Two pipes A and B can independently fill a tank completely in 20 and 30 minutes respectively. If both the pipes are opened simultaneously, how much time will they take to fill the tank completely?  (CSE 2015)

(a) 10 minutes 
(b) 12 minutes 
(c) 15 minutes 
(d) 25 minutes

Solution: (b)

Time taken by A  and B is 20 and 30 min respectively to fill a tank.

Work = time Γ— efficiency  
Total work = LCM of 20 and 30 = 60 

Efficiency of pipe A = 60/20 = 3 
Efficiency of pipe B = 60/30 = 2 
Efficiency when both work together = 3 + 2 = 5 
So, total time = 60/5 = 12 minutes.

So, Both A and B will take time to fill the tank completely together is 12 min.


Day 24 - (20 May 2024)

Q.1 Consider the following statements followed by two conclusions:  (CSE 2015)

Statements : Some men are great. 

         : Some men are wise. 

Conclusion I : Men are either great or wise. 

Conclusion II : Some men are neither great nor wise.

Which one of the following is correct? 

(a) Only conclusion I is valid.
(b) Only conclusion II is valid.
(c) Both the conclusions are valid.
(d) Neither of the conclusions is valid.

Solution: (d)

  • Understanding with a venn diagram.

It shows that both the conclusions do not hold true.


Q.2 Consider the following statements: (CSE 2015)

1. Some claim to have seen UFOs Unidentified Flying Objects. 

2. Life on other heavenly bodies is considered to be a possibility. 

3. Voyage to space is now an established fact. 

From the above statements it may be concluded that-

(a) UFOs are heavenly bodies 
(b) UFOs are sent from other heavenly bodies 
(c) Some living species in other heavenly bodies are more intelligent than man 
(d) Nothing definite can be said about the UFOs

Solution: (d)

  • As per the statements, life on other heavenly bodies might be possible but it is not a surety. And though some people claim to have seen UFOs, it is not an accepted or proven thing.

Day 25 - (21 May 2024)

Q.1 Usha runs faster than Kamala Priti runs slower than Swati Swati runs slower than Kamala. Who is the slowest runner? (CSE 2015)

(a) Kamala 
(b) Priti
(c) Swati 
(d) Usha

Solution: (b)

According to question-
Relative Speeds->   Priti < Swati < Kamala < Usha.

Thus it can be concluded that PRITI is the slowest runner.


Q.2 If ABC Γ— DEED = ABCABC; where A, B, C, D and E are different digits, what are the values of D and E?  (CSE 2015)

(a) D = 2, E = 0 
(b) D = 0, E = 1 
(c) D = 1, E = 0 
(d) D = 1, E = 2 

Solution: (c)

When we write any Number in form of ABCABC, that number must be divisible by 13, 11 and 7. Also, ABCABC is multiple of 1001 

So, 1001 = DEED 
1001 = 13 Γ— 11 Γ— 7  
ABC Γ— DEED = ABC 
ABC β‡’ ABC Γ— 1001 = ABC ABC 
On comparing D = 1, E = 0



Day 26 - (22 May 2024)

Q.1 Between 6 PM and 7 PM the minute hand of a clock will be ahead of the hour hand by 3 minutes at-  (CSE 2015)

(a) 6: 15 PM 
(b) 6: 18 PM 
(c) 6: 36 PM 
(d) 6: 48 PM

Solution: (c)

Between 6 PM and 7 PM, the minute hand and the hour hand coincide at 6 hr β€˜m’ minutes.

Thus, the hour hand and minute hand coincide at 6 hr 32 8/11 mins.

Now, after 3 minutes i.e. at 6 : 36 PM the minute hand of a clock will be ahead of the hour hand by 3 minutes.


Q.2 There are 5 tasks and 5 persons. Task-l cannot be assigned to either person-l or person-2. Task-2 must be assigned to either person-3 or person-4. Every person is to be assigned one task. In how many ways can the assignment be done? (CSE 2015)

(a) 6 
(b) 12 
(c) 24 
(d) 144

Solution: (c)

Given - 5 persons and 5 tasks.

Condition I, When task T2 is given to person 3 
No of ways for Task T1= 2 
For Task 2 = 1 
For Task 3 = 3 
For Task 4 = 3 
For Task 5 = 3 
Total no. of ways for condition = 3 + 3 + 3 + 2 + 1 = 12 

Condition II, When task T2 is given to be person 4
No. of ways for Task T1 = 2
For Task T2 = 1
For Task T3 = 3
For Task T4 = 3
For Task T5 = 3 

Total number of ways for condition II= 3 + 3 + 3 + 2 +1 = 12 
Total number of ways for conditions I and II = 12 + 12 = 24


Day 27 - (23 May 2024)

Q.1 The monthly incomes of Peter and Paul are in the ratio of 4 ∢ 3. Their expenses are in the ratio of 3 ∢ 2. If each saves Rs.6,000 at the end of the month, their monthly incomes respectively (in Rs.) are ? (CSE 2015)

(a) 24,000 and 18,000 
(b) 28,000 and 21,000 
(c) 32,000 and 24,000 
(d) 34,000 and 26,000

Solution: (a)

Given data, Peter and Paul’s income ratio = 4 :3  
Peter and Paul’s Expense = 3 : 2 

Now-> Saving = income – expense 
Saving of each = 6000 Rs 
Income = 4x : 3x 
Expense = 3y : 2y 

Equations
β‡’ 4x -3y = 6000 β€”(1)
β‡’ 3x – 2y = 6000 β€”(2) 

By solving (1) and (2), we get x = y = 6000 

So, the income of Peter is 4x = 4 Γ— 6000 = 24000 Rs
The income of Paul is 3x = 3 Γ— 6000 = 18000 Rs.


Q.2 Two cities P and Q are 360 km apart from each other. A car goes from P to Q with a speed of 40km per hour and returns back to P with a speed of 50 km per hour. Whta is the average speed of the car? (CSE 2015)

(a) 44.44 km per hour 
(b) 48 km per hour 
(c) 50 km per hour 
(d) 55 km per hour

Solution: (a)

Distance between the two cities = 360 km 

Formula:
Average speed = Total distance/Total time 
Distance = Speed Γ— Time 

So, 
Time taken by car A to cover distance from P to Q = 360/40 = 9 hours 
Time taken by car A to cover distance from Q to P = 360/50 = 7.2 hours
Average speed = (360 + 360)/(9 + 7.2) = 44.44 km/hr 


Day 28 - (24 May 2024)

Q.1 In a society it is customary for friends of the same sex to hug and for friends of opposite sex to shake hands when they meet. A group of friends met in a party and there were 24 handshakes. Which one among the following numbers indicates the possible number of hugs? (CSE 2015)

(a) 39
(b) 30
(c) 21
(d) 20

Solution: (c)

Let number of women be x
Let number of men be y
Total number of hand shakes = xy = 24 
Possible factors of x and y become -> 
x = 6 or 4,  y = 4 or 6 


Q.2 Two men, Anil and David, and two women, Shabnam and Rekha are in a sales group. Only two speak Tamil. The other two speak Marathi. Only one man and one woman can drive a car. Shabnam speaks Marathi. Anil speaks Tamil. Both Rekha and David can drive. Which of the following statements is true? (CSE 2015)

(a) Both the Tamil speakers can drive a car.  
(b) Both the Marathi speakers can drive a car.  
(c) Both of those who can drive a car speak Marathi.  
(d) One of those who can drive a car speaks Tamil

Solution: (d)

From the below table, it can be seen that only those who can drive a car can speak Tamil.


Day 29 - (25 May 2024)

Q.1 In a plane, line X is perpendicular to line Y and parallel to line Z; line U is perpendicular to both lines V and W; line X is perpendicular to line V. Which one of the following statements is correct? (CSE 2015)

(a) Z, U and W are parallel.
(b) X, V and Y are parallel.
(c) Z, V and U are all perpendicular to W.
(d) Y, V and W are parallel.

Solution: (d)

The figure indicates that Y, V and W are parallel.


Q.2 A cow costs more than 4 goats but less than 5 goats. If a goat costs between Rs. 600 and Rs. 800 which of the following is a most valid conclusion? (CSE 2015)

(a) A cow costs more than Rs 2 500. 
(b) A cow costs less than Rs.3 600. 
(c) A cow costs between Rs.2 600 and Rs.3 800. 
(d) A cow costs between Rs. 2 400 and Rs.4 000.

Solution: (d)

Let β€˜g’ be the cost of goats.
4g < Cow < 5g

Now, if goat price= Rs 600
2400 < Cow < 3000

If goat price=  Rs 800
3200 < Cow <  4000

Hence, it can be seen that cow cost is between Rs. 2400 and Rs. 4000.


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