Regent Prelim P2

NAME: _____________________________________ INDEX NUMBER: ________ CLASS: _________ SETTER: MDM NOR RASIDAH _______________________________________________________________________ PHYSICS 6091/02 Paper 2 Theory 27 Aug 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required _______________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer one questions. Write your answers in the spaces provided on the question paper. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. The number of marks is given in brackets [ ] at the end of each question or part question. _______________________________________________________________________ This document consists of 22 printed pages. TARGET PARENT’S SIGNATURE REGENT SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR (EXPRESS) 80

2 Section A [70 marks] Answer all the questions in this section in the space provided. 1 Fig. 1.1 shows the speed of a ball of mass 35 g falling through the air. Fig. 1.1 (a) On Fig. 1.1, draw a graph to show the speed of the ball falling from rest in a vacuum. [1] (b) Calculate the acceleration of the ball falling through the air at t = 0.20 s. acceleration = ………………………. [2] (c) Calculate the resistive force at time t = 0.20 s. resistive force = …………………. [2] 0.2 0.4 0.6 0.8 1.0 1.2 1.0 3.0 speed / m/s time / s 0 2.0 4.0

3 (d) State and explain the maximum resistive force acting on the ball as it falls through the air. ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………….. [2]

4 2 A small metal sphere S is supported by an insulating string as shown in Fig. 2.1. Fig. 2.1 (Not drawn to scale) Sphere S has a negative charge while sphere R has a positive charge. Sphere S has a weight of 5.0 x 10-4 N and the tension of the string is 4.0 x 10-4 N. (a) On Fig. 2.1 draw the electric field lines to represent the electric field in the region between R and S. [2] (b) By the means of a vector diagram, determine the magnitude of the electric force acting on S. State the scale used. scale: ………………….. electric force = ……………………. [3] + _ R S 25

5 3 Fig. 3.1 shows a worker carrying a ladder with a bucket hanged at one end. The ladder has a mass of 1.6 kg, and its centre of mass is 0.85 m from the worker’s shoulder. Fig. 3.1 (a) A bucket of weight 4.0 N is suspended from the ladder at a horizontal distance of 1.3 m from the worker’s shoulder. The worker keeps the ladder horizontal by exerting a vertical force at point L. L is a horizontal distance of 0.60 m from his shoulder. Determine the size and direction of the force exerted at L. magnitude of force at L = ......................... N direction of force L = …………………………. [3] (b) The ladder is wider at one end than at the other end. Explain why this improves the stability of the ladder when it is being used. ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………….. [2] 0.60 m 1.3 m 0.85 m L

6 4 Fig. 4.1 shows a bicycle pump. Fig. 4.1 (a) Explain in terms of molecular motion how the trapped air creates a pressure on the washer. ………………………………………………………………………………………… ………………………………………………………………………………………… ..…………………………………………………………………………………… [2] (b) The nozzle of the pump is connected to a manometer as shown in Fig. 4.2. and the handle of the pump is pulled to the left until the pressure of the trapped air is at 0.75 x 105 Pa. Atmospheric pressure is 1.0 x 105 Pa and density of mercury is 13 600 kg/m3. Fig. 4.2 (i) On Fig. 4.2, draw the level of the mercury in the manometer. [1] (ii) Calculate the height difference between the mercury in the two sides of the manometer. height difference = ……………………… [2] connected to nozzle of pump barrel handle shaft oiled washer nozzle trapped air

7 5 A water wave is travelling from left to right across the water surface of a pond at a speed of 24 cm/s. Fig. 5.1 shows a snapshot of the wave at a certain moment. R and S are two water particles on the water surface. R makes 45 complete oscillations in one minute. Fig. 5.1 (Not drawn to scale) (a) State the type of wave generated. Explain your answer. ……………….……………………………………………………………………….. …………………….………………………………………………………………….. …………………………….……………………………………………………….[2] (b) Calculate (i) the time taken for R to reach the highest point, time taken = ……………………………. [2] (ii) the distance between R and S. distance = ……………………. [2] R S undisturbed water level wave motion

8 6 Fig. 6.1 shows a ray of light travelling from air into a prism made of diamond. The refractive index of diamond is 2.4. The path of the ray is incomplete. Fig. 6.1 (not drawn to scale) (a) Calculate the speed of light in diamond. speed of light in diamond = ……………………. [2] (b) Calculate angle P. angle P = ……………………. [2] (c) Explain what is meant by critical angle. ………………………………………………………………….………..…………… ………………………………………………………………….……..……………[1] (d) Calculate the critical angle of diamond. critical angle = ……………………. [1] (e) State and explain the path of the ray after it incident at point Q. ………………………………………………………………………………………… ………………………………………………………………………………………… ……………………………………..…………………………..…………….…… [2] 42 P Q 50

9 7 A 6.0 V battery of e.m.f. 6.0 V is connected to a network of resistors and a voltmeter, as shown in Fig. 7.1. Fig. 7.1 Resistor Y has a resistance of 12 Ω and resistor Z has a resistance of 16 Ω. The resistance X of the variable resistor X is adjusted until the voltmeter reads 4.8 V. (a) Calculate (i) the current in resistor Z, current = .......................... [1] (ii) the total resistance of X and Y connected in parallel, total resistance = ................................ [2] (b) The resistance X is now decreased. State and explain the change, if any, to the reading on the voltmeter. ..……………………………………………………………………………….……… …………..………………………………………………………………….………… ………………………………………..…………………………………………… [2] Z 16  Y 12  X

10 (c) Resistor Z is replaced with a thermistor. State and explain the change, if any, to the reading on the voltmeter when the surrounding temperature increases. ..……………………………………………………………………………….……… …………..………………………………………………………………….………… ………………………………………..…………………………………………… [2] 8 A liquid contains some radioactive material is injected into the patient’s blood stream. This radioactive mate