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UPSC CAPF (AC) 2026 Paper I · Question 116

Question 116 of the UPSC CAPF (AC) 2026 Paper I (19 July 2026). Try it first, then open the answer and explanation.

  1. CAPF 2026 · P-I · Q116 · General Science · Physics

    For a particle in uniform circular motion (radius R and angular velocity ω), the magnitude and direction of acceleration, respectively are

    1. ωR, along the radius outward
    2. ωR, towards the centre of the circle
    3. ω²R, towards the centre of the circle
    4. ω³R, along the linear velocity

    एकसमान वृत्तीय गति में गतिशील किसी कण (त्रिज्या R एवं कोणीय वेग ω) के लिए त्वरण के परिमाण (magnitude) और दिशा क्रमशः क्या हैं?

    1. ωR, त्रिज्या की दिशा में बाहर की ओर
    2. ωR, वृत्त के केन्द्र की ओर
    3. ω²R, वृत्त के केन्द्र की ओर
    4. ω³R, रैखिक वेग की दिशा में
    Show answer

    Answer: (3) ω²R, towards the centre of the circle

    उत्तर: (3) ω²R, वृत्त के केन्द्र की ओर

    In uniform circular motion the speed is constant but the direction keeps changing, which needs a centripetal acceleration a = v²/R = ω²R (since v = ωR), always directed towards the centre. ωR is the linear speed, not the acceleration.

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