NHHS 2025 PHY PRELIM P3 QP

This paper consists of 15 printed pages. Name: _____________________________________ ( ) Class: Sec 4 / ( ) NAN HUA HIGH SCHOOL PRELIMINARY EXAMINATIONS 2025 Subject : Physics Paper : 6091/3 Level : Secondary Four Date : 12 August 2025 Duration : 1 hour 50 minutes INSTRUCTIONS TO CANDIDATES Write your name, class and register number in the spaces at the top of this page and on any separate answer paper used. Answer all questions. All of your answers should be written in this Question Paper: scrap paper must not be used. Graph paper is provided in this Question Paper. Additional sheets of graph paper should be used only if necessary to do so. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as these observations are made. An account of the method of carrying out the experiment is not required. The use of approved scientific calculator is expected, where appropriate. 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. Shift Laboratory For Examiner’s Use 1 2 3 Total

Nan Hua High School Preliminary Examinations 2025 Physics 6091/3 Page 2 of 15 Section A 1 In this experiment you will investigate the deviation of a ray of light that is reflected internally from the surface of a rectangular transparent block. You are provided with: • a transparent block • Light source with slit, • 30-cm ruler, • protractor, • an A4 paper (a) (i) Measure the length (L), width (W) and height (H) of the transparent block using the 30 cm ruler. L = W = H = [1] (ii) Given that the mass of the glass block is 416 g. Calculate the density of the glass block. density = [2]

Nan Hua High School Preliminary Examinations 2025 Physics 6091/3 Page 3 of 15 (b) Fig. 1.1 On Fig. 1.2 on page 5 of your question paper, Trace the outline of your glass block and label it PQRS as above. Align the short side QR along the dotted line. Mark a point B on edge PQ at 20 mm from Q. Draw a dotted line at B perpendicular to PQ and label it N to represent the normal. Draw a line which makes an angle of incidence (i) of 40 ° with the normal. (i) Measure and record i. i = [1] Place the glass block onto the outline marked PQRS. Turn on the light source to illuminate the slit. Position the illuminated slit so that a single ray of light is along the line.

Nan Hua High School Preliminary Examinations 2025 Physics 6091/3 Page 4 of 15 The light ray will emerge from the edge SR of the glass block as shown in the diagram. You may use the A4 paper provided shade the diagram (to block the ambient light i