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    Question

    Work done in physics can be:I. ZeroII.

    PositiveIII. Negative
    A I, II, and III Correct Answer Incorrect Answer
    B Only II and III Correct Answer Incorrect Answer
    C Only I and II Correct Answer Incorrect Answer
    D Only III and I Correct Answer Incorrect Answer

    Solution

    Work done in physics can indeed be zero, positive, or negative:
    - Zero work occurs when force is applied without displacement or when force is perpendicular to displacement (e.g., carrying a bag horizontally).
    - Positive work happens when force and displacement are in the same direction (e.g., pushing an object forward).
    - Negative work occurs when force and displacement are in opposite directions (e.g., friction opposing motion).
    Mathematically, work (W) = Force (F) × Displacement (d) × cos(θ), where θ is the angle between force and displacement. When θ = 0°, work is positive; when θ = 180°, work is negative; and when θ = 90°, work is zero.

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