beatty BTYSS 4E5N ScPhy PRELIM 2020 QP2

SUBJECT : Science Physics LEVEL : Sec 4E/5N PAPER : 5076 / 2 DURATION : 1 hour 15 minutes SETTER : Mrs Seah-Pay Ling Ling DATE : 27 Aug 2020 CLASS : NAME : REG NO : READ THESE INSTRUCTIONS FIRST Write your register number, name and class on the work you hand in. You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A Answer all questions. Write your answers in the spaces provided on the Question Paper. Section B Answer any two questions. Write your answers in the spaces provided on the Question Paper. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part-question. _____________________________________________________________________ This paper consists of 18 printed pages (including this cover page) For Examiner’s use Section A /45 Q Q Section B /20 Total /65 BEATTY SECONDARY SCHOOL PRELIMINARY EXAMINATION 2020 [Turn over]

- 2 - Section A (45 Marks) Answer ALL questions in the space provided. Examiner’s Remark 1 A positively-charged metal sphere P is hung from an insulating string as shown in Fig. 1.1. Fig. 1.2 shows the effect on P when a negatively -charged metal sphere Q on an insulated rod is positioned cl ose to it. The string makes an angle  with the vertical. Given that the mass of sphere P is 5.0 x 10 -3 kg and the attraction force acting on P is 1.5 x 10-1 N. Draw a labeled vector diagram to determine the tension of the string and the angle  made by the string with the vertical. scale = ………………………..…….. tension of string = ……………….. N angle,  = .………………..  [4] Insulating rod Fig. 1.1 P Fig. 1.2 P Q

- 3 - 2 Fig. 2.1 shows the speed-time graph of a car and a lorry travelling on a straight road. The lorry is travelling at a uniform speed of 15.0 m/s. The car is travelling at 10 m/s. It then accelerates uniformly from t = 5.0 s to t = 12.0 s, and continues the rest of the journey with a uniform speed of 18.0 m/s. Examiner’s Remark (a) Calculate the acceleration of the car between t = 5.0 s to t = 12.0 s. acceleration = ……………….. m/s2 [2] (b) Calculate the average speed of the car from t = 0 s to t = 18.0 s. speed = ……………….. m/s [2] (c) State how the distance between the car and the lorry changes during the period of (i) t = 5.0 s t