UPSC CSE Prelims 2021 Answer Key

upsc cse prelims 2021 paper 1 gs and paper 2 csat answer key of all set a, set b, set c, set d

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This year UPSC conducted Civil Services Preliminary Examination on 10th October 2021. With the help of the UPSC 2021 Prelims Answer Key released by Chahal Academy, candidates can calculate their tentative score and check their chances of clearing UPSC Prelims Result 2021. ...

The cut off for UPSC Prelims Paper 1 (General Studies) is not fixed and will be decided on the basis of, how tough it is for majority of the candidates: if it is tough for majority of the candidates cut off will be lower (may be around 90) if it easy cut off marks could go even more than 110, only while Paper 2 (CSAT) is qualifying in nature i.e., you just need to score minimum 66 marks in paper 2. Also there is negative marking for every wrong answer i.e., 1/3rd marks which will be deducted for every wrong question for gs 0.66 and for csat 0.83 (csat is qualifying exam at 33% marks, one qualifies it).

The Union Public Service Commission (UPSC) conducts the Civil Services Examination every year in three stages. The first stage of the Civil Services Exam is the Prelims. The UPSC Prelims is an objective type exam which comprises two papers each of 200marks, namely, Paper 1 General Studies - GS (100 questions) and Paper 2 CSAT (80 questions). Prelims Exam Generally gets held in may to june but because of covid last year's exam was conducted late hence this year's prelims also got delayed and conducted on 10th oct 2021. Next year there won't be any delay and it will be conducted on time, 5th june 2022.

UPSC CSE Prelims General Studies (GS) Answer Key 2021: Paper 1

Que Set A Answer Key Set B Answer Key Set C Answer Key Set D Answer Key
1 C B B A
2 D B B C
3 B A B D
4 A C D B
5 B A D D
6 D C C D
7 C D D C
8 A A C D
9 D A B C
10 D C D B
11 C C C B
12 A A B B
13 B A B B
14 C B D B
15 C D A C
16 A C B B
17 B D A B
18 D A C A
19 A C A A
20 B B A B
21 C C A C
22 B A C B
23 D B D B
24 A C B D
25 B C D A
26 C A D A
27 D B A A
28 C D D C
29 A A C A
30 D D A D
31 C C B B
32 A D B B
33 A B B A
34 B A B D
35 D B C B
36 C D B B
37 D C B A
38 A A A D
39 C D A D
40 B D D D
41 B C B B
42 B B B B
43 A D A B
44 A A D D
45 A B B D
46 C C B C
47 D D A D
48 A C D C
49 A A D B
50 A D D D
51 C B C C
52 B B B D
53 A B A B
54 D D C A
55 B D A B
56 B C C D
57 A D D C
58 D C A A
59 D B A D
60 D D A D
61 B C C C
62 B B A B
63 B B A D
64 B D B A
65 C A D B
66 B B C C
67 B A D C
68 A C A C
69 A A C A
70 B A O D
71 A B C C
72 C B B A
73 D B D B
74 B B A C
75 D C B C
76 D B C A
77 A B D B
78 D A C D
79 C A A A
80 A D D D
81 C B C B
82 B B A B
83 B A B A
84 D D C C
85 A A B A
86 B B A C
87 A C A D
88 C D D A
89 A D A A
90 A D D D
91 B A C C
92 B C D A
93 B D B A
94 D B A B
95 D D B D
96 C D D C
97 D A C D
98 C D A A
99 B C D C
100 D A D B

Click On The Question To See The Options:

(a) It is dipolar in nature (b) It is a good conductor of heat (c) It has high value of specific heat (d) It is an oxide of hydrogen

1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street lights, sodium lamps have longer life span than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting.

    Select the correct answer using the code given below. (a) 3 only (b) 2 only (c) 1 and 3 only (d) 1, 2 and 3

(a) Genes introduced in the genetically modified plants. (b) Development of India's own satellite navigation system. (c) Radio collars for wildlife tracking (d) Spread of viral diseases.

(a) Low-density polyethylene (b) Polycarbonate (c) Polyethylene terephthalate (d) Polyvinyl chloride

(a) Food preservative (b) Fruit-ripening substances (c) Reused plastic containers (d) Toiletries

(a) Distances among staller bodies do not change. (b) Gravity of staller bodies does not change. (c) Light always travels in same straight line. (d) Speed of light is always same.

1. As regards legislation, the British Parliament is supreme or sovereign but in India, the power of the Parliament to legislate is limited. 2. In India, matters related to the constitutionality of the Amendment of an Act of the Parliament are referred to the Constitution Bench by the Supreme Court. 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

1. N. Gopalaswamy Iyanger committee suggested that a minister and a secretary be designated solely for pursuing the subject of administrative reform and promoting it. 2. In 1970, the Department of Personnel was constituted on the recommendation of the Administrative Reforms Commission, 1966 and this was placed under the Prime Minister's charge. Which of the Statements given above is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

(a) Article 15 (b) Article 19 (c) Article 21 (d) Article 29

1. In India, there is no law restricting the candidates from contesting in one Lok Sabha election from three constituencies. 2. In 1991 Lok Sabha Election, Shri Devi Lal contested from three Lok Sabha constituencies. 3. As per the existing rules, if a candidate contests in one Lok Sabha election from Many constituencies, hi/her party should bear the cost of bye-elections to the constituencies vacated by him/her in the event of him/her winning in all the constituencies. Which of the Statements given above is/are correct ? (a) 1 only (b) 2 only (c) 1 and 3 only (d) 2 and 3 only

1. Burrowing animals and termites 2. Fire 3. Grazing herbivores 4. Seasonal rainfall 5. Soil properties Select the correct answer using the code given below: (a) 1 only (b) 4 and 5 (c) 2, 3 and 4 (d) 1, 3 and 5

1. The amount of water in the rivers and lakes is more than the amount of groundwater. 2. The amount of water in polar ice caps and glaciers is more than the amount of groundwater. Which of the Statements given above is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

1. Moringa (drumstick tree) is a leguminous evergreen tree. 2. Tamarind tree is endemic to South Asia. 3. In India, most of the tamarind is collected a sminor forest produce. 4. India exports tamarind and seeds of moringa. 5. Seeds of moringa and terminated can be used in the production of biofuels. Which of the Statements given above is/are correct ? (a) 1, 2, 4 and 5 (b) 3, 4 and 5 (c) 1, 3 and 5 (d) 1, 2, 3 and 5

(a) Brown forest soil (b) Fissure volcanic rock (c) Granite and schist (d) Shale and limestone

1. Genetic engineering is applied in the development of these vaccines. 2. Bacteria and viruses are used as vector Which of the Statements given above is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of egg. 2. A child inherits mitochondrial disease entirely from mother and from father. Which of the Statements given above is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

(a) Clonal propagation of crop plants (b) Developing genetically modified crop plants (c) Production of plant growth substances (d)production of bio fertilizers

1. Area of the hole in the lid 2. Temperature of the flame 3. Weight of the lid Select the correct answer using the code given below. (a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3

UPSC CSE Prelims Cut-off Marks of Last 6 years

Sr. Year GS Cut Off Marks
1 UPSC 2015 107.34/200
2 UPSC 2016 116.00/200
3 UPSC 2017 105.34/200
4 UPSC 2018 98/200
5 UPSC 2019 98/200
6 UPSC 2020 92.5 /200
7 UPSC 2021 Expected Cutoff 92 (+/- 5)

We at Chahal Academy are releasing the most accurate and the most comprehensive Answer Key with Marks calculator for both for Paper 1 General Studies and Paper 2 CSAT....

Events Date of Event
UPSC CSE Prelims Exam 10 October, 2021
UPSC CSE Prelims Exam Result End of October 2021 (Expected)
UPSC CSE Prelims Exam Official Answer key UPSC Releases the official answer key only after declaring the final selections.
UPSC CSE Mains Exam 7th January 2022
UPSC CSE Exam Calender Download Official Exam Calendar

UPSC CSE Prelims CSAT Answer Key 2021: Paper-2

Que Set A Answer Key Set B Answer Key Set C Answer Key Set D Answer Key
1 D C A D
2 B C D A
3 C A B B
4 D B C C
5 C D C C
6 B C A B
7 B A C C
8 D C C B
9 D A C D
10 D B B B
11 D A D C
12 A D B C
13 B B C A
14 C C D B
15 C C C D
16 B A B C
17 C C B A
18 B C D C
19 D C D A
20 B B D B
21 A D C D
22 D A C B
23 B B A C
24 C C B D
25 C C D C
26 A B C B
27 C C A B
28 C B C D
29 C D A D
30 B B B D
31 C B D A
32 C B A D
33 A C B B
34 B D C C
35 D C C C
36 C B B A
37 A B C C
38 C D B C
39 A D D C
40 B D B B
41 A C D B
42 D B D C
43 D B B C
44 A C B A
45 B B D B
46 B B B B
47 B B C D
48 A A D A
49 D D B C
50 C D A B
51 B D A C
52 C D D B
53 C B D B
54 A B A C
55 B D B B
56 B B B B
57 D C B B
58 A D A A
59 C B D D
60 B A C D
61 D B C A
62 D C B D
63 B C B D
64 B A C A
65 D B B B
66 B B B B
67 C D B A
68 D A A A
69 B C D D
70 A B D C
71 C A B D
72 B D C D
73 B D C B
74 C A A B
75 B B B D
76 B B B B
77 B B D C
78 A A A D
79 D D C B
80 D C B A

Best of Luck to All Those Who Have Appeared in UPSC Civil Services 2021 Prelims Examination.

UPSC Civil Services Prelims 2021 CSAT Paper 2 Answer Key will be available soon for all the sets SET A, SET B, SET C and SET D.

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