MODUL PENINGKATAN PRESTASI TINGKATAN 5 TAHUN 6 MAJLIS PENGETUA SEKOLAH MALAYSIA (KEDAH) MODUL FIZIK Kertas 2 Peraturan Pemarkahan
BAHAGIAN A (a) Base quantity Derived quantity Distance Speed Mass Time 2 Note: All correct award 2 marks 2 3 correct award mark v =!""!.$% = 80 km h - // 22.22 m s - 4 2(a) Refraction Glass block/ Bongkah kaca Correct direction (towards normal) Wavelength decreases & ' & ( = * ' * ( = +,.% v :v 2 = 6: 5 5 3(a) The rate of change of momentum in a collision or explosion A strong impact force produced in a short ime when collision occurs %"" " -%"" ($,.,/) F =! = -3890 N (i) Decreases (ii) Time of impact increases / longer impact time (d) Air bag // seat belt // padded dashboard //crumple zone 6 4(a) n-p-n transistor To limit base current / to control base current Resistance changes with brightness (d) 2 x 6.5!".%3 2 (e) R Q 3.5 kω Minimum R Q = 3.5 kω Resistance of Q increases // Base voltage increases Base current, I B flows / Transistor switches on 2
7 5(a) (i) F Coil F Both direction correct award mark (i) Diagram 5.2 > Diagram 5. (ii) Diagram 5.2 < Diagram 5. (iii) Diagram 5.2 < Diagram 5. (i) The smaller the thickness, the smaller the spring constant / vice versa (ii) The greater the angle of deflection of pointer, the smaller the spring constant / vice versa (iii) Diagram 5.2 (d) Use stronger magnet // increase number of coils 8 6(a) Incompressible liquid (i) Diagram 6. = Diagram 6.2 (ii) Diagram 6. < Diagram 6.2 (iii) Diagram 6. < Diagram 6.2 (i) The smaller the cross sectional area of output piston, the smaller the force exerted / vice versa (ii) Pascal (d) (i) No change / same (ii) No change in input pressure 8 7(a) (i) Total internal reflection (ii) Incident angle is greater than the critical angle // light propagates from denser medium to less dense medium! 2.42 = 456 7 c = 24.4 o (i) Higher / more / bigger / larger Reason: Bent easily (ii) Higher / more / larger Reason: More data/energy can be transmitted (iii) Higher / more Reason: Less signal/energy loss 0 8(a) Unstable isotope (i) Shorter Reason: Water will not be contaminated for a longer period (ii) Beta Reason: Moderate penetrating power // Can penetrate the ground to a certain range only (iii) Liquid Reason: Dissolve well / easily with water S (d) (i) When the ratemeter reading increases abruptly (ii) GM tube (e) 00% à 50% à 25% à 2.5% 3 T! $ = 3 x 5.27 3
BAHAGIAN B = 5.8 tahun 2 9(a) Pressure Temperature of air in air tight container in Diagram 9. < Diagram 9.2 Length of air in air tight container in Diagram 9. < Diagram 9.2 Reading of Bourdon gauge is the same. The lower the temperature of air in the container, the shorter the length of air in the container // vice versa Charles Law Reading of Bourdon gauge increases Friction between tyre and the road produces heat // Heat is absorbed by the air molecules in the tyre Kinetic energy // Velocity of air molecules in the tyre increases Rate of collision between air molecules and the walls of the tyre increases // Air molecules hit the walls of the tyre more frequently (d) (i) Specific heat capacity of the liner is bigger Good insulator (ii) (iii) (iv) (v) Use oil to fill up air space Able to transfer heat more efficiently High sensitivity of thermometer Gives more accurate reading Higher rated power of the electrical heater Able to supply more power / heat Wrap aluminium block with thick cloth Reduce heat loss to the surrounding 0(a) Current (i) The ammeter reading in Diagram 0. is lower / vice versa The cross-sectional area of wire PQ is smaller / vice versa The resistance of wire PQ is higher / vice versa (ii) The smaller the cross-sectional area, the lower the reading of the ammeter / vice versa The smaller the cross-sectional area, the higher the resistance (d) / vice versa When the Van de Graaff generator is switched on, plate X is positively charged. Electrical force is produced. The ping pong ball is attracted to / touches plate X. The surface of the ping pong ball is positively charged. Like charges repel and the ping pong ball swings to plate Y. (i) The density is lower The power bank is lighter / easier to carry (ii) The capacity is higher Able to recharge repeatedly / supply more power / can be used for a longer time (iii) Shorter charging time Able to save time (iv) Rate of power loss is lower Able to save energy (v) Higher number / more USB ports Able to recharge more devices at once Max: 4 4
BAHAGIAN C (a) Rate of change of displacement AB : Velocity increases uniformly / Constant acceleration BC : Constant velocity // Zero / No acceleration CD : Velocity decreases uniformly / Constant deceleration Moving in opposite direction Larger diameter of tyre Wheelchair can move faster Narrow tyre Less contact with the ground / Easier to move Low seat More stable / Lower centre of gravity Bigger angle of camber Increases stability Best choice: R Big diameter, narrow tyre, low seat and bigger angle of camber (d) (i) E P = mgh = 95 x 0 x 0 = 9500 J (ii) E P = E K = ½ mv 2 9500 = ½ (95) v 2 v = 4. m s (iii) No energy loss to the surrounding 2(a) (d) (i) Sources which vibrate at the same frequency and in phase / * Accept: same wavelength λ = & 8 = 9""!$"" = 0.25 m (ii) x = *: ; = ".$% (%.") $." = 0.625 m At night, temperature of air decreases Density of air is higher Wavelength decreases // Velocity decreases x is directly proportional to λ Radio wave Longer wavelength // Easy to diffract Higher frequency Faster transmission // More energy // Can go further Greater number of antenna Transmit more signals at one time // Stronger signal transmitted Higher position Less obstacle // Less signal loss Best choice: Q Radio wave, higher frequency, greater number of antenna and placed at higher position 5