YTSS 2025 Physics Prelims

NAME: ( ) CLASS: YISHUN TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2025 SECONDARY 4 G3 PHYSICS (6091/2) DATE : 19 Aug 2025 DAY : Tuesday DURATION: 1 hr 45 min MARKS: 80 marks READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. Section A Answer all the questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. Candidates are reminded that all quantitative answers should include appropriate units. You may use an approved calculator. Section A /70 Section B /10 TOTAL /80 This question paper consists of 21 printed pages.

2 Section A Answer all questions. 1 Fig. 1.1 shows one method of measuring the diameter of a beaker. Fig 1.1 (a) State the diameter of the beaker. ………………………………………………………………………………………….... [1] (b) Suggest an instrument that could measure the diameter of the beaker more precisely. ……………………………………………………………………………………….…... [1] (c) Student A makes use of the readings taken in (a) to calculate the base area of the beaker. Student B makes use of the instrument in (b) and tells student A that his calculated area is more accurate. State if you agree with student B and explain your answer. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………….... [2] ruler . wooden block . beaker . bench .

3 2 Fig. 2.1 shows a ball being released from rest from its initial position above the ground. The ball falls vertically and rebounds. initial position ball rebound Fig 2.2 shows how the velocity of the ball varies with time. Fig. 2.2 Fig. 2.1 ground

4 (a) Using the information from the graph, calculate: (i) the acceleration of the ball after it rebounds. acceleration = [2] (ii) the initial height the ball was released. height = [2] (iii) the displacement from the initial position after the ball has reached its maximum height after the first rebound. displacement = [2] (b) Explain how Fig. 2.2 shows that the effect of air resistance on the ball is negligible. ………………………………………………………………………………………………. …………………………………………………………………………………………...... [1]

5 3 Fig. 3.1 shows a wheelbarrow and its load, which has a total mass of 15 kg . This is supported by a vertical force F at the end of its handles. The centre of gravity of the wheelbarrow is marked, c.g. on Fig. 3.1. Fig. 3.1 (a) (i) State the Principle of