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Combined Science — Physics Flashcards

6 cards from real O-LEVEL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Combined Science — Physics flashcards as text

  1. What is the turning effect of a force called?

    Answer: Moment

    The turning effect of a force is called a moment (or torque). Moment = Force × perpendicular distance from pivot.

  2. In which medium does light travel fastest?

    Answer: Vacuum

    Light travels fastest in a vacuum at approximately 3 × 10⁸ m/s. It slows down in any medium.

  3. What is the effect of increasing temperature on the resistance of a metallic conductor?

    Answer: Resistance increases

    In metallic conductors, increasing temperature causes more vibration of ions, increasing resistance by impeding electron flow.

  4. A 60 W bulb is used for 5 hours. How much energy does it consume?

    Answer: 1080 kJ

    Energy = Power × time = 60 W × (5 × 3600 s) = 60 × 18000 = 1,080,000 J = 1080 kJ.

  5. What is the name given to the point where all the weight of an object appears to act?

    Answer: Centre of gravity

    The centre of gravity is the point where the entire weight of an object appears to act, regardless of the object's orientation.

  6. Which type of current changes direction periodically?

    Answer: Alternating current

    Alternating current (AC) periodically reverses direction, as in mains electricity supply in Singapore (230V, 50Hz).

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  1. file.go.gov.sg — Retake policy · verified Nov 2026
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