NHHS 2025 PHY PRELIM P2 QP

This document consists of 21 printed pages. Name: _____________________________________ ( ) Class: Sec 4 / ( ) Subject : Physics Paper : 6091/02 Level : Secondary Four Date : 1 September 2025 Duration : 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces at the top of this page. Write in dark blue or black pen. You may use HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. 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. NAN HUA HIGH SCHOOL PRELIMINARY EXAMINATION 2025 For Examiners’ Use Section A Section B Total

Nan Hua High School Preliminary Examination 2025 Physics 6091/2 Page 2 of 21 Section A Answer all the questions in this section. 1 (a) A 7.0 kg picture frame is being suspended from a nail by a string. The string forms two segments exerting tensions T1 and T2 as shown in the Fig. 1.1. The strings also make an angle of 35° and 60° with the vertical respectively. Fig. 1.1 In the space below, draw a vector diagram to determine the tensions T1 and T2. Specify the scale used. T1 = T2 = [4]

Nan Hua High School Preliminary Examination 2025 Physics 6091/2 Page 3 of 21 (b) (i) Explain what is meant by the precision of a measuring instrument. [1] (ii) Hence, state the precision of a digital caliper. [1] (c) Currently nuclear power provides approximately 9% of the world's electricity. This translates to about 2600 terawatt-hours (TWh) of electricity generated annually by nuclear reactors. Calculate the energy generated by nuclear reactors annually in joules. energy = ………………... [2]

Nan Hua High School Preliminary Examination 2025 Physics 6091/2 Page 4 of 21 2 (a) State the principle of moments. [1] (b) Fig. 2.1 shows a decoration that hangs by string from the ceiling in a toyshop. Four objects, P, Q, R and S hang by string from rods 1 and 3. These two rods hang by string from rod 2. The decoration is completely stationary and the r