2023 VS Phy P2 S4 Prelim

Class Register Number Name 6091/02 PHYSICS 23/4P/6091/02 Paper 2 Wednesday 30 August 2023 1 hour 45 minutes VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHO OL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHO OL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHO OL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. INSTRUCTIONS TO CANDIDATES Write your name, class and index number in the spaces at the top of this page. Write in dark blue or black pen. Answer all the questions within 1 hour 45 minutes. You may use a HB pencil for any diagrams or graphs. INFORMATION FOR CANDIDATES This paper consists of 25 printed pages, including the cover page. [Turn over] For Marker’s Use Section A /50 Section B /30 Deduction s. f. Total /80 The number of marks is given in brackets [ ] at the end of each questions or part questions. Candidates are reminded that all quantitative answers should include appropriate units. Candidates are advised to show all their working in a clear and orderly manner.

2 © VICTORIA SCHOOL 23/4P/6091/02 Section A Answer all the questions in this section. 1 Fig. 1.1 shows the velocity-time graph of a cyclist. (a) Calculate the displacement of the cyclist during the first 8.0 s. displacement = ………..……..….. [2] (b) Determine the acceleration of the cyclist during the first 2.0 s. acceleration = ………..……..….. [1] 2.0 4.0 6.0 8.0 10.0 20 40 -40 -20 velocity / (m / s) time / s 10 30 -30 -10 Fig. 1.1 0 12.0

3 © VICTORIA SCHOOL 23/4P/6091/02 (c) Describe the motion of the cyclist between 2.0 s and 10.0 s. ………………………………………………………………………………..………………. ………………………………………………………………………………..………………. …………………………………………………………………………………..…………..... …………………………………………………………………………………..………... [2] (d) The cyclist applies the brakes with a decreasing acceleration and comes to a stop at 12.0 s. On Fig. 1.1, draw the motion of the cyclist starting at 10.0 s. [1]

4 © VICTORIA SCHOOL 23/4P/6091/02 2 Fig. 2.1 shows a door and an automatic door-closer viewed from above. When the door opens and closes, the hinge acts as a pivot while a force F is exerted by the door closer. Fig. 2.1 A force P is applied on the knob of the door. When force P is 35 N, the door remains stationary. (a) State the condition for the door to remain stationary. …………………………….………………………………………………….……………….. .…………………………………………………….……………..………………….……. [1] (b) Calculate the moment of force P about the hinge. moment = ……..……..….. [1] (c) Hence, determine the magnitude of force F. F = ………..…..….. [2] 26 cm 54 cm knob P door bar door closer hinge bar fixed to wall

5 © VICTORIA SCHOOL 23/4P/6091/02 3 Fig. 3.1 shows part of a roller coaster track XYZ. Fig. 3.1 A machine lifts the car and passengers to point X. The machine has a power of 1.3 MW. The time taken to reach point X is 20 s. The efficiency of the machine in raising the car and the passengers to point X is 40 %. (a) State what is meant by the efficiency of the machine. ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………..… [1] (d) Force P increases and the door swings open at a steady rate. Compare and explain the magnitude of force F with force P. …………………………………………..…………………………………………………….. ………………………………………..……………………………………………………….. .………………………………………….………………………..………………….……. [1] roller coaster car and passengers X Y Z

6 © VICTORIA SCHOOL 23/4P/6091/02 (b) The mass of the roller coaster car and passengers is 1500 kg. The gravitational field strength is 10 N / kg. Calculate the maximum height gained by the roller coaster car when it reaches point X. maximum height = ……………..……. [2] (c) Describe the energy changes of the roller coaster car from point X to point Y. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………….. [3] (d) When the roller coaster car reaches point Z, work done by a machine slows it to a stop. State what is meant by work done by a machine. ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………..… [1]

7 © VICTORIA SCHOOL 23/4P/6091/02 4 Fig. 4.1 shows the equipment that is being used to measure the pressure of the gas in the flask at sea level. Fig. 4.1 (a) Define pressure. …………………………………………………………………………………………………. ……………………………………………………………………………………………… [1] (b) State the name of the equipment shown in Fig. 4.1 that is used to measure the pressure of the gas. ………………………………………………………………………………………..……. [1] (c) The atmospheric pressure is 1.0 × 105 Pa at sea level. The distance between mercury level P and mercury level Q is 320 mm. The density of mercury is 13.6 g / cm3 and the gravitational field strength is 10 N / kg. Determine the pressure of the gas inside the flask. pressure = …………………… Pa [2] mercury 320 mm flask P Q gas atmospheric pressure

8 © VICTORIA SCHOOL 23/4P/6091/02 (d) The equipment is brought to the top of a mountain. Describe and explain the effect on the mercury level P and level Q when the atmospheric pressure decreases. …………………………………………………………………………………………………. …………………………………………………………………………………………………. …………………………………………………………………………………………………. ……………………………………………………………………………………..………. [2]

9 © VICTORIA SCHOOL 23/4P/6091/02 5 Fig. 5.1 shows a car with emitters that emit a n ultrasound of 3.0 MHz when the car is reversing. The sensors that are fitted to the rear will detect the ultrasound reflected by the stationary lorry. A buzzer will produce audible beeps to alert the car driver. The speed of sound in air is 330 m / s. emitters and sensors Fig. 5.1 (a) State the meaning of an ultrasound of 3.0 MHz. …………………………………………………………………………………….………..… …………………………………………………………………..…………………..……. [1] (b) Describe how the ultrasound is transferred in the air. …………………………………………..…………….……………………………….……… …...……………….…………………..……………………….………………….…………... ………………………………..………………………………………………..……………… ….……………………………………..………………………………………………..…. [2] (c) The time taken for the ultrasound to echo back is 4.0 ms. Calculate the distance between the rear of the car and the back of the lorry at this instant. distance = ………..……..….. [2] (d) The pitch and loudness of the buzzer becomes higher as the car moves closer to the lorry. Describe how the frequency and amplitude of the buzz