Paper 2 style practice paper: Multiple choice (Extended) — mark scheme
QuizQuipPractice Series
QQ/IGCSE-PHYS/P2S
IGCSE · Cambridge IGCSE Physics (Extended)
Mark scheme
Multiple choice (Extended)
Paper 2 style practice paper · Maximum mark: 40
Notes for markers
- Award one mark for each point marked [1], up to the marks shown for the part.
- Accept answers worded differently that show the same understanding.
- Units are required where the answer line shows one. ecf: allow an error carried forward.
Section A: Multiple-choice questions[40 marks]
| Question | Answer | |
|---|---|---|
| 1 | BReading above the true surface always adds a little extra, so every value comes out larger than reality. | 1 |
| 2 | BPeriod = total time ÷ number of swings = 35 ÷ 40 = 0.88 s. | 1 |
| 3 | AMomentum and gravitational field strength both have direction; every other option contains scalars. | 1 |
| 4 | DPerpendicular velocities combine by Pythagoras: √(4.0² + 3.0²) = 5.0 m/s. | 1 |
| 5 | BOn a speed–time graph a horizontal line means the speed value never changes — constant speed. | 1 |
| 6 | Ca = Δv/Δt = (18 − 6.0) ÷ 8.0 = 1.5 m/s². | 1 |
| 7 | AW = mg = 80 × 4.9 = 392 N — weight follows the local field strength, not Earth’s. | 1 |
| 8 | DVolume = 2.0³ = 8.0 cm³; density = 16 ÷ 8.0 = 2.0 g/cm³. | 1 |
| 9 | BConvert 9.0 mm to 0.0090 m, then k = 3.6 ÷ 0.0090 = 400 N/m. | 1 |
| 10 | CBalance (equilibrium) requires the anticlockwise moments to equal the clockwise moments. | 1 |
| 11 | AFriction in the brakes and tyres transfers the motion energy into thermal (internal) energy. | 1 |
| 12 | DUseful output = 0.60 × 1500 = 900 J; the other 600 J is wasted, warming the motor. | 1 |
| 13 | BWork = mgΔh = 40 × 9.8 × 5.0 = 1960 J; power = 1960 ÷ 10 = 196 W. | 1 |
| 14 | CpV is constant at constant temperature, so halving V doubles p. | 1 |
| 15 | AΔp = ρgΔh = 1200 × 9.8 × 4.0 = 47 040 Pa ≈ 47 kPa. | 1 |
| 16 | DDuring melting the energy breaks particle bonds, so the temperature holds at 0 °C until all the ice has melted. | 1 |
| 17 | BWarm fluid expands, becomes less dense and rises while cooler fluid sinks — a convection current. | 1 |
| 18 | CMatt black surfaces both emit and absorb infrared most strongly; shiny surfaces reflect it. | 1 |
| 19 | Av = fλ = 40 × 4.5 = 180 m/s. | 1 |
| 20 | DSlower waves have shorter wavelength (λ = v/f), so the fronts bunch up and the direction bends — refraction. | 1 |
| 21 | BTotal path = 1500 × 1.6 = 2400 m; the depth is half that: 1200 m. | 1 |
| 22 | CFrom the surface to the normal: 90° − 15° = 75°, which is both the incidence and the reflection angle. | 1 |
| 23 | An = speed in air ÷ speed in medium = (3.0 × 10⁸) ÷ (2.0 × 10⁸) = 1.5. | 1 |
| 24 | DInside the focal length the rays diverge, giving the magnifying-glass image: upright, enlarged, virtual. | 1 |
| 25 | BViolet sits at the short-wavelength, high-frequency end of the visible spectrum. | 1 |
| 26 | CGamma rays kill microorganisms even inside sealed packs — the standard sterilisation choice. | 1 |
| 27 | AUV damages surface cells and the eyes, and can lead to skin cancer; internal heating is the microwave hazard. | 1 |
| 28 | DClean regeneration keeps quality over long distances, and pulse coding packs data densely — the two digital benefits. | 1 |
| 29 | BConvert 1.5 min = 90 s; I = Q/t = 90 ÷ 90 = 1.0 A. | 1 |
| 30 | CA diode conducts in one direction only, after a small threshold voltage — the flat part shows negligible reverse current. | 1 |
| 31 | AR = (6.0 × 3.0) ÷ (6.0 + 3.0) = 18 ÷ 9.0 = 2.0 Ω — less than either branch. | 1 |
| 32 | DEnergy = 2.0 kW × 0.50 h = 1.0 kW h. | 1 |
| 33 | BThe fault current surges through the earth wire and melts the fuse, cutting the supply before anyone is hurt. | 1 |
| 34 | CSoft iron loses its magnetism as soon as the current stops; steel would stay magnetised. | 1 |
| 35 | AVs = 240 × 60/1200 = 12 V — a step-down transformer with 20 times fewer secondary turns. | 1 |
| 36 | DA faster rate of cutting field lines induces a larger e.m.f.; motion parallel to the lines cuts none. | 1 |
| 37 | BAlpha particles are helium nuclei: two protons plus two neutrons, with charge +2. | 1 |
| 38 | C30 years is three half-lives: ½ × ½ × ½ = ⅛. | 1 |
| 39 | AGamma’s penetration lets it reach every part of the sealed pack, killing microorganisms without opening it. | 1 |
| 40 | DReceding galaxies show stretched (redshifted) wavelengths in every direction — the expansion of the Universe. | 1 |
— End of mark scheme —