The Combined Defence Services (CDS) examination is conducted by the Union Public Service Commission (UPSC) for recruitment into the Indian Military Academy, the Indian Naval Academy, the Air Force Academy, and the Officers Training Academy. The CDS 1 2021 cycle was the first of the year, and its answer key is essential for candidates who wish to verify their answers, calculate their expected scores, and gauge their chances of selection.
Exam Structure
The CDS 1 2021 paper consisted of two sections:
English 100 marks, 100 questions, 1 mark each.
General Knowledge & Elementary Mathematics 100 marks, 100 questions, 1 mark each.
There was no negative marking, making it crucial for aspirants to attempt all 200 questions.
Answer Key Details
UPSC released the official answer key a few days after the exam. Below is a summary of the key features:
Section
Total Questions
Correct Answers
Sample Question
Correct Option
English
100
See PDF (official)
Identify the synonym of Plausible.
Believable
General Knowledge
50
See PDF (official)
Who won the Nobel Peace Prize 2021?
Maria Ressa & Dmitry Muratov
Elementary Mathematics
50
See PDF (official)
Find the value of x if 3x - 7 = 11.
6
The complete answer key is available on the UPSC website in PDF format. Candidates can download it, compare each answer with their response sheet, and compute their raw score. Because there is no negative marking, the score is simply the count of correct answers.
Result Analysis
Based on the answer key, the following trends were observed:
English Difficulty: The English section was moderately easy, with many questions testing vocabulary, grammar, and comprehension. Candidates scoring above 70% in English typically secured a strong overall rank.
General Knowledge: Questions spanned current affairs, Indian polity, history, geography, and basic science. Topics such as the Indian Space Programme and recent international events were heavily featured.
Mathematics: The elementary mathematics portion covered arithmetic, algebra, geometry, and data interpretation. Simple numerical problems dominated, favoring candidates with quick calculation skills.
Cutoff Estimates: For CDS 1 2021, the preliminary cutoff for Air Force candidates was around 115120 marks, while the Army, Navy and OTA cutoffs ranged between 110115 marks. These figures are based on historical data and should be treated as approximations.
Preparation Tips for Future CDS Exams
Even though the answer key is now publicly available, it serves as a valuable study resource. Here are some practical tips for aspirants aiming for the next CDS cycle:
Analyze the Answer Key: Identify the topics where you missed the most questions. Prioritize those areas in your revision.
Build Vocabulary: Use flashcards for synonyms, antonyms, and idiomatic expressions that appeared in the English section.
Stay Updated on Current Affairs: Read a reliable newspaper daily and maintain a concise notes section for national and international events.
Practice Speed Math: Solve at least 30 mathematics questions daily within a 10minute time frame to improve accuracy under pressure.
Take Mock Tests: Simulate the full 2hour exam environment. After each test, compare your answers with the official key to assess progress.
Review Mistakes: Keep a log of every error with the correct answer and an explanation. Revisiting this log before the exam can reinforce learning.
Remember that consistent effort, systematic analysis of the answer key, and disciplined practice are the cornerstones of success in the CDS examination.
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