CONFIDENTIAL 1 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL MAKTAB RENDAH SAINS MARA PEPERIKSAAN AKHIR TINGKATAN 4 SEMESTER II PERATURAN PEMARKAHAN FIZIK Kertas 2 Buku peraturan ini mengandungi 7 halaman bercetak.
CONFIDENTIAL 2 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL PAPER 2 Mark SECTION A Remark 1 (a) 1 Amplitude (b) 1 Damping (c) (i) 1 Tuning fork Q vibrates (with maximum amplitude and produces sound ) (c) (ii) 1 The vibrations of tuning fork P have forced tuning fork Q to vibrate in resonance with P // Resonance occurs // Fork Q vibrate with the same natural frequency as P TOTAL 4 (a) 1 Length // Volume Reject:expand (b)(i) 1 Zero // O (b)(ii) 1 Thermal equilibrium (c) 1 1 = L / L100 x 100°C = (12.9 cm / 20.0 cm) x 100°C = 64.5 °C M1 - Correct substituition M2 - Correct answer with unit(c.a.w.u) TOTAL 5 3 (a) (i) 1 Electric field (a) (ii) 1 Transverse waves // do not need medium for propagation // can propagate through vacuum // have speed in vacuum, c = 3.00 × 108 m s–1, and move with lower speed in any medium // show phenomena of reflection, refraction, diffraction and interference under suitable conditions (b)(i) 1 Radiowave (b)(ii) 1 X ray (c) v = 2d t
CONFIDENTIAL 3 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL 1 1 = 0.0003 s M1 - Correct substituition M2- Correct answer with unit(c.a.w.u) TOTAL 6 4 (a) (i) 1 Convex mirror (a) (ii) 1 It will be diverged (b) 1 Wide field of vision // wider view (c) M1-2 correct rays M2-Correct reflected rays with dotted lines M3-Correct image (with dotted lines) (d) (i) 1 Decreases (d) ii) 1 Increases // higher Reject: magnified (e) 1 Vehicle rear mirror//Side mirror//Security mirror TOTAL 9 5 (a) 1 Heat capacity, C of a substance is the quantity of heat needed to raise the temperature of the substance by 1°C F C Object Objek Mirror Cermin I
CONFIDENTIAL 4 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL (b)(i) (b)(ii) (b)(iii) (b)(iv) 1 1 1 1 Temperature in diagram 5.1< 5.2 Mass of water in diagram 5.1 > 5.2 The larger the mass of water the lower the temperature Specific heat capacity Reject : Heat capacity (c)(i) 1 1 Q = mc∆Ꝋ = 0.25 (4200) (43-28) = 15750 J M1 – Correct substituition M2 - Correct answer with unit(c.a.w.u) (c)(ii) 1 1 t = Q P = 15750 50 = 315 s M1 - Correct substituition M2 - Correct answer with unit(c.a.w.u) TOTAL 9
CONFIDENTIAL 5 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL 6. (a) 1 Distance between focal point,F and the optical center of the lense,O. // Distance between focal point and centre of the lens // Distance between F and O (b) (i) 1 The thickness of the lens in Diagram 6.1 is lower than Diagram 6.2. (b) (ii) 1 The focal length of the lens in Diagram 6.1 is higher than Diagram 6.2. (b) (iii) 1 Thinner concave lens has a longer focal length or vice versa. (b) (iv) 1 Refraction of light ( c) (i) M1- 2 Correct refracted rays with direction and dotted line M2- Second ray with direction M3-Correct image with dotted line (c) (ii) 1 Diminished // Upright // Virtual TOTAL 9 7. (a) (i) 1 Refraction of water waves is the change in direction of propagation of waves when the waves propagate in different depth of water Reject : change in speed (ii) 1 Wavelength // Wave speed // Direction of propagation
CONFIDENTIAL 6 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL (b)(i) (b)(ii) (b)(iii) 2 2 2 - Bottom structure should be (a slope) and wide - To reduce the speed of waves // withstand high water pressure at greater depth - Structure of the front surface should be uneven and covered with rocks - To absorb the wave energy more effectively // reduce reflection - Wave breaker should be high - To prevent the waves from splashing over // prevent overflow of water M1 M2 M1 M2 M1 M2 (c) 1 Model P TOTAL 9 8. (a) 1 Convex lens (b) 1 At focal point // Same as the focal length (c) (i) 1 1 Focal length: Long Reason: Angle of view becomes narrow // magnification increases (c) (ii) 1 1 Surrounding light intensity: High Reason: Produce brighter image (c) (iii) 1 1 Camera resolution: High Reason :More details image // More pixels Reject:Image bigger//sharper (d) 1 (Camera in ) smartphone TOTAL 9
CONFIDENTIAL 7 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL Mark SECTION B Remark 9. (a) 1 Measurement of the degree of hotness of an object. (b) 3 V1/T1 = V2/T2 1.2 / (30 +273) = V2 / (60 + 273) V2 = 1.32 cm3 M1 -change unit to kelvin M2 -substitution M3 -correct answer with unit (c) 2 M1 - When temperature increases, average kinetic energy of particle increases M2 - Distance between molecules increases, volume increases (b) 2 2 2 2 2 Characteristics Reason/explanation Sensitivity of impact sensor High Able to detect impact in short time Material for airbag nylon not react with gas // heat resistant // not easy to melt // strong Rate of airbag expansion high fast to inflate Position of airbag upper body prevent head / face injury W High sensitivity, nylon airbag, high rate of expansion and airbag at upper body (e) 4 M1 - During inhale, volume of chest cavity increases. M2 - So, the pressure inside the lung is lower than outside // there is a difference in pressure M3 - During exhale, volume of chest cavity decreases. M4- Pressure inside the lung greater than outside // there is a difference in pressure TOTAL 20
CONFIDENTIAL 8 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL 10. (a) 1 Total internal reflection (b)(i) 2 M1–direction of light bent towards normal M2– speed decreases // from less dense to denser medium (Reject: direction change) (ii) 2 M1 –Light travel from dense to less dense medium M2– incident angle is greater than critical angle (c) 2 2 2 2 2 Characteristics Reason/explanation Faceted Many More dispersion of light // total internal reflection greater Size(carat) High Can trap more light Purity High High refractive index // smaller crtitcal angle // Easy for total internal reflection to occur Refractive index High Easy for total internal reflection to occur //smaller critical angle P Many faceted, high carat, high purity, high refractive index. (d)(i) 2 n = 1/sin c M1 - 1.5 = 1/ sin c M2 - c = 41.81 ° M1 - substitution M2 - correct answer with unit (d)(ii) 2 M1 – 1 st ray and normal line M2 – 2nd ray and normal line 30° 60° A B C 2 nd 1 st
CONFIDENTIAL 9 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL (iii) 1 i = 30°, TOTAL 20 Mark SECTION C Remark 11. (a) 1 Interference of sound waves (b) 4 M1 – when 2 crests/troughs meet M2 – Constructive interference/antinodes occur producing loud sound M3 – When trough and crest meet M4 – Destructive interference/nodes occur producing soft sound Reject: Produce loud/soft sound only (c) 5 M1 – Amplitude in both diagrams are the same M2 – number of complete oscillations in Diagram 11.2 is greater than Diagram 11.3 M3 – Period of the traces in Diagram 11.2 is lower than Diagram 11.3 M4 – the greater the number of complete oscillations the smaller the period of oscillation M5 – the smaller the period of oscillation the greater the frequency (d) 2 2 2 2 2 2 Modification Reason Position of tower High/on top of hill / on top of building Received more signal // signal is not blocked Shape of parabolic/satellite dish Concave All Parallel signal converged to receiver Diameter of parabolic dish Bigger Capture more signal Angle of Dish Can rotate 3600 Receive signal from all position Surface of the dish Smooth // shining Reflect all received signal to receiver Size of parabolic dish Big Capture more signal
CONFIDENTIAL 10 4531/2 4531/2 © 2021 Hak Cipta Bahagian Pendidikan Menengah MARA CONFIDENTIAL 2 Max 10m Position of receiver At focal point All Parallel signal converged to receiver Reject reason effectively TOTAL 20 PENGIRAAN MARKAH : [(KERTAS 1 + KERTAS 2) / 140] x 100%