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Logical Reasoning and Deduction

2 UPSC Prelims MCQs tagged "Logical Reasoning and Deduction". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

Agriculture and Allied Activities 56 Money, Banking and Monetary Policy 43 Environmental Pollution 43 Biotechnology 37 Parliament 33 Climate Change 32 Finance and Financial Markets 29 Emerging Technologies 28 Trade and External Sector 26 Life Sciences 26 Core Concepts and Foundational Science 20 Public Finance in India 19 International Environmental Framework 18 Continents 18 Religions in India 18 Fundamental Rights 18 Concept and Salient Features of the Constitution 17 Indian Biodiversity - Fauna 17 Renewable Energy 16 Major Physical Divisions of India 16 Multilateral Groupings 16 International Institutions 15 Art and Architecture 15 Drainage System 15 Institutional Measures for Environment Conservation 14 Regional Groupings 14 Rivers and Drainage 14 Infrastructure and Investment Models in India 14 Atmosphere 13 Space Technology 13

  1. To understand inclination of students towards various subjects, three students are asked to give…

    To understand inclination of students towards various subjects, three students are asked to give their preference for three subjects: Mathematics, Science and History. Each student either preferred or did not prefer each subject. Two students selected History, one student selected Science, two students selected Mathematics. Student 1 does not select Mathematics and Science. Student 2 selects subjects except Science. Student 3 does not select History. Which of the following statements is false?

    1. AStudent 1 and Student 2 both selected Mathematics
    2. BStudent 2 selected History and Student 3 selected Science
    3. CStudent 1 selected History and Student 3 selected Mathematics
    4. DStudent 2 selected Mathematics and History
    Answer and explanation

    Correct answer: A

    From the same deduction, the final allotment is Student 1 = History, Student 2 = Maths and History, Student 3 = Science and Maths. Student 1 never takes Mathematics, so the claim that Students 1 and 2 both selected Mathematics is false. Options (b), (c) and (d) all match the valid allotment and are true.

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    CSAT UPSC GPSC-2026 Medium

  2. To understand inclination of students towards various subjects, three students are asked to give…

    To understand inclination of students towards various subjects, three students are asked to give their preference for three subjects: Mathematics, Science and History. Each student either preferred or did not prefer each subject. Two students selected History, one student selected Science, two students selected Mathematics. Student 1 does not select Mathematics and Science. Student 2 selects subjects except Science. Student 3 does not select History. Which of the following statements is true?

    1. AStudent 1 selected Mathematics
    2. BStudent 3 selected Science and History
    3. CStudent 2 selected Mathematics and History
    4. DNone of the above
    Answer and explanation

    Correct answer: C

    Since only one student took Science and neither Student 1 nor Student 2 could, Science goes to Student 3. History needs two takers but Student 3 cannot, so History goes to Students 1 and 2. Mathematics needs two takers but Student 1 cannot, so Maths goes to Students 2 and 3. That leaves Student 1 with History only, Student 2 with Maths and History, and Student 3 with Science and Maths, which makes option (c) true.

    Open this question on its own page

    CSAT UPSC GPSC-2026 Medium