Forwarded from UPSC FIX 2026 - 27 - 28
UPSC CSE (Pre) 2023 - GS Answer Key-B (Ready).pdf
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🛑PAPER - 1 Answer Key🛑🛑
👆UPSC Prelims 2023 Paper -1 Answer Key. Have a look. Come live at 6 P.M.
Set - B (Original File)
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👆UPSC Prelims 2023 Paper -1 Answer Key. Have a look. Come live at 6 P.M.
Set - B (Original File)
Join 🔜 @UPSCFIX
Join: @himanshu_Sir_1
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ˡᶦᵏᵉ ᶜᵒᵐᵐᵉⁿᵗ ˢᵃᵛᵉ ˢʰᵃʳᵉ
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The difference between 42% of a number and 28% of the same number is 210. What is 59% of that number?
Anonymous Quiz
9%
(a) 630
54%
(b) 885
29%
(c) 420
7%
(d) 900
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An item is bought for Rs 42 and sold it for Rs. 52.50. Calculate the percentage increase.
Anonymous Quiz
13%
(a) 20%
20%
(b) 80%
30%
(c) 22%
37%
(d) 25%
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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? (UPSC-2015)
Anonymous Quiz
9%
(A) 8
48%
(B) 10
27%
(C) 15
16%
(16) 16
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A student has to get 40% marks to pass in an examination. Suppose he gets 30 marks and fails by 30 marks, then what are the maximum marks in the examination? (UPSC-2018)
Anonymous Quiz
14%
(a) 100
27%
(b) 120
52%
(c) 150
8%
(d) 300
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Q. In a class, 60% of students are from India and 50% of the students are girls. If 30% of the Indian students are girls, then what percentage of foreign students are boys? (UPSC 2021)
Anonymous Quiz
5%
a. 45%
34%
b. 40%
27%
c. 30%
34%
d. 20%
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Rakesh borrows Rs. 600 from Himanshu at a rate of 10 paise per month per Rs. 2 (Simple Interest) for nine months. How much interest will he have to pay?
Anonymous Quiz
9%
(a) Rs. 45
17%
(b) Rs. 540
63%
(c) Rs. 270
10%
(d) Rs. 1350
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👆Ans. C | Explanation
Here, Rate = Rs. 0.10/month per Rs. 2
So, rate per Rs. 1 = Rs. 0.05/month
Simple Interest = Principal × Rate × Time = 600 × 0.05 × 9 = Rs. 270
Hence, option (c) is correct.
Here, Rate = Rs. 0.10/month per Rs. 2
So, rate per Rs. 1 = Rs. 0.05/month
Simple Interest = Principal × Rate × Time = 600 × 0.05 × 9 = Rs. 270
Hence, option (c) is correct.
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📌 UPSC CSE Mains - 2023 Warriors Group. An initiative by Guidance IAS Institute.
🖌It will be a dedicated Mains-2023 Aspirants Group for Daily Answer Writing Practice.
🖌Every Morning 5 Questions will be posted at around 9 a.m. The Model answers will be posted in the Evening at 9 p.m.
🖌Every Model Answer will be having Current examples, data, diagrams, maps etc.
🖌The Themes are Selected from both Static & Current portion (last 1.5 years of Hindu & I.E.) which have High Relevance & Probability to be asked in Mains - 2023.
🖌For Ethics all the Casestudies are properly curated & renewed with respect to the current affairs of last 2 years.
🖌We hope that the initiative will help you to find a peer group of aspirants writing Mains 2023.
👉We will not waste your Time. We are Ready, Are you Ready...
You can text at @Guidanceiasinstitute with your Prelims Hall Ticket, Name & Roll Number to Join.
Guidance IAS Team.
Share & Join: @UPSCFIX
🖌It will be a dedicated Mains-2023 Aspirants Group for Daily Answer Writing Practice.
🖌Every Morning 5 Questions will be posted at around 9 a.m. The Model answers will be posted in the Evening at 9 p.m.
🖌Every Model Answer will be having Current examples, data, diagrams, maps etc.
🖌The Themes are Selected from both Static & Current portion (last 1.5 years of Hindu & I.E.) which have High Relevance & Probability to be asked in Mains - 2023.
🖌For Ethics all the Casestudies are properly curated & renewed with respect to the current affairs of last 2 years.
🖌We hope that the initiative will help you to find a peer group of aspirants writing Mains 2023.
👉We will not waste your Time. We are Ready, Are you Ready...
You can text at @Guidanceiasinstitute with your Prelims Hall Ticket, Name & Roll Number to Join.
Guidance IAS Team.
Share & Join: @UPSCFIX
👍6
If α and β are two real numbers such that α + β = - q/p and αβ = r/p, where 0<p<q<r (p, q, r are natural numbers), then which one of the following alternatives represents the highest value?
Anonymous Quiz
5%
(a) 1 / (α + β)
33%
(b) (1/ α) + (1/ β)
48%
(c) – 1/ (αβ)
13%
(d) αβ/(α + β)
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📌 Ans. C | Explanation
It is given that α + β = - q/p and αβ = r/p, where 0<p<q<r
So, let’s assume p = 1, q = 2 and r = 3.
Putting these values in answer options, we get
(A) 1 / (α + β) = - p/q = - (1/2)
(B) (1/ α) + (1/ β) = (α + β)/ αβ = -(q/p) × (p/r) = - (q/r) = - (2/3)
(C) – 1/ (αβ) = -(p/r) = - (1/3)
(D) αβ/(α + β) = r/p × (-p/q)= - r/q = - (3/2)
We can see that, - (1/3) is the greatest among the above values.
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It is given that α + β = - q/p and αβ = r/p, where 0<p<q<r
So, let’s assume p = 1, q = 2 and r = 3.
Putting these values in answer options, we get
(A) 1 / (α + β) = - p/q = - (1/2)
(B) (1/ α) + (1/ β) = (α + β)/ αβ = -(q/p) × (p/r) = - (q/r) = - (2/3)
(C) – 1/ (αβ) = -(p/r) = - (1/3)
(D) αβ/(α + β) = r/p × (-p/q)= - r/q = - (3/2)
We can see that, - (1/3) is the greatest among the above values.
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Mr. Suresh owns a 5 metre × 4 metre coffee shop. He plans to tile the rectangular floor of this shop with grey-coloured square tiles. Each side of the tile measures 20 cm. What must be the total cost of fitting the tiles, if they cost Rs. 40 per piece?
Anonymous Quiz
3%
(a) Rs. 12,000
21%
(b) Rs. 16,000
24%
(c) Rs. 24,000
52%
(d) Rs. 20,000
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📌 Ans. D | Explanation
Area of coffee shop = 5 metre × 4 metre = 20 square metres
Area of one tile = 0.2 metres × 0.2 metre = 0.04 square metres
Number of tiles required = Area of rectangular region / Area of one square tile = 20 square metres / 0.04 square metres = 500
Therefore, total cost of fitting the tiles = number of tiles × cost of fitting 1 tile = 500 × 40 = Rs. 20,000
Hence, option (D) is the correct answer.
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Area of coffee shop = 5 metre × 4 metre = 20 square metres
Area of one tile = 0.2 metres × 0.2 metre = 0.04 square metres
Number of tiles required = Area of rectangular region / Area of one square tile = 20 square metres / 0.04 square metres = 500
Therefore, total cost of fitting the tiles = number of tiles × cost of fitting 1 tile = 500 × 40 = Rs. 20,000
Hence, option (D) is the correct answer.
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👍8❤2
Q. A company X sold apple juice at cost price by mixing water in it and gained a profit of 25%. What must be the ratio of juice and water in the mixture?
Anonymous Quiz
7%
(a) 1:5
23%
(b) 3:2
66%
(c) 4:1
5%
(d) 2:3
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Ans. C
Explanation:
We know that, if we mix any liquid with water and sell it at cost price to gain a profit of x%, then the ratio of liquid and water is (100:x).
Here, x = 25%
Required ratio = 100:25 = 4:1
Explanation:
We know that, if we mix any liquid with water and sell it at cost price to gain a profit of x%, then the ratio of liquid and water is (100:x).
Here, x = 25%
Required ratio = 100:25 = 4:1
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Q. A number is multiplied by one-sixth, then divided by one-seventh, and then multiplied by seven-tenth. Result is what percent of the original number?
Anonymous Quiz
18%
(a) 49/6%
27%
(b) 50/3%
50%
(c) 245/3%
5%
(d) 5/3%
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📌 Ans. C | Explanation:
The best way to do this is to start with 100 and calculate the result.
The final number will be as follows:
[(100 × 1/6) ÷ 1/7] × 7/10
= (100/1) × (1/6) × (7/1) × (7/10)
= 245 /3 = 245/3%
So, the final number will be 245/3% of the original number.
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The best way to do this is to start with 100 and calculate the result.
The final number will be as follows:
[(100 × 1/6) ÷ 1/7] × 7/10
= (100/1) × (1/6) × (7/1) × (7/10)
= 245 /3 = 245/3%
So, the final number will be 245/3% of the original number.
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Q. राम और सुनीता के पास कुछ पैसे हैं। उनके पास उपलब्ध पैसों की राशि का गुणनफल 308700 रुपये है और यह ज्ञात है कि सुनीता के पास राम से कम पैसे हैं। यदि उनके पैसों का महत्तम समापवर्तक (HCF) 105 रुपये है तो राम के पास कितने पैसे हैं?
Anonymous Quiz
10%
(a) 420 रुपये
61%
(b) 735 रुपये
24%
(c) 815 रुपये
5%
(d) 675 रुपये
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📌 Ans. B | Explanation:
माना राम और सुनीता के पास क्रमशः 105x रुपये और 105y रुपये हैं।
∴ 105x × 105y = 308700
या 105x × 105y = (105 × 7) × (105 × 4)
हम जानते हैं कि सुनीता के पास राम से कम पैसे हैं। इसलिए x > y
∴ x = 7 और y = 4
इसलिए राम के पास 105x = 105 × 7 = 735 रुपये हैं।
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माना राम और सुनीता के पास क्रमशः 105x रुपये और 105y रुपये हैं।
∴ 105x × 105y = 308700
या 105x × 105y = (105 × 7) × (105 × 4)
हम जानते हैं कि सुनीता के पास राम से कम पैसे हैं। इसलिए x > y
∴ x = 7 और y = 4
इसलिए राम के पास 105x = 105 × 7 = 735 रुपये हैं।
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एक क्लब में 160 खिलाड़ियों में से 10% खिलाड़ी हॉकी, क्रिकेट और बास्केटबॉल खेल सकते हैं। इसमें से 30 खिलाड़ी ऐसे हैं जो केवल दो खेल खेल सकते हैं। 40 खिलाड़ी केवल हॉकी खेल सकते हैं। केवल क्रिकेट या केवल बास्केटबॉल खेलने वाले खिलाड़ियों की कुल संख्या कितनी है?
Anonymous Quiz
4%
(a) 92
28%
(b) 86
56%
(c) 74
12%
(d) 68
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