Demo. An invented family, made-up minutes, nobody's real child. The quizzes work: pass a round and watch the clock change.

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⚛️ Physics, NCEA

Years 11 to 13 · Read up first

10 questions. Get 8 right to earn 10 minutes. All 10 right = +5 bonus. They start easy and get harder as you go, so treat the first few as a warm-up. Every one you miss comes back with the answer and why.

1. Refraction is the

bending of light as it passes from one medium into anotherbouncing of light off a surfaceabsorption of light by a black surfacesplitting of light into colours only

2. Newton's first law states that an object will remain at rest or move at constant velocity unless

acted on by an unbalanced (net) forcegravity stops acting on itit is touched by another objectit runs out of energy

3. Isotopes of an element have the same number of protons but a different number of

electronsatomic numberneutronsprotons

4. The wave equation relates wave speed, frequency and wavelength as

speed = frequency divided by wavelengthspeed = frequency minus wavelengthspeed = frequency times wavelengthspeed = frequency plus wavelength

5. Sound waves are

not waves at allonly able to travel through a vacuumtransverse waves, where particles vibrate perpendicular to the direction of travellongitudinal waves, where particles vibrate parallel to the direction of travel

6. The reason light refracts when it crosses a boundary is that

its speed changes in the new mediumits frequency changesits colour changesit gains energy

7. In a series circuit with a 12 V battery and two identical resistors, the voltage across each resistor is

0 V each, since no current flows24 V each, since resistors add up12 V each, since voltage is the same throughout a series circuit6 V each, since the total voltage splits between components in series

8. Radioactive decay is a

random process for any individual nucleus, but predictable in large numbersprocess that can be sped up by heating the sampleprocess that never actually happens in natureperfectly predictable process for each individual atom

9. A 3 kg trolley moving at 4 m/s collides and sticks to a stationary 1 kg trolley. Using conservation of momentum, what is their combined velocity after the collision?

3 m/s4 m/s12 m/s1 m/s

10. A magnet is pushed into a coil of wire connected to a sensitive meter. According to the principle of electromagnetic induction, a current is induced in the coil because

current only flows if the magnet touches the wire directlythe magnet loses its magnetism as it entersthe coil's wire becomes magnetised permanentlythe magnetic field through the coil is changing, which induces an electromotive force (voltage) that drives a current

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