NHHS 2024 sec4 phy prelim P2

This document consists of 21 printed pages. Name: _____________________________________ ( ) Class: Sec 4 / ( ) Subject : Physics Paper : 6091/02 Level : Secondary Four Date : 26 August 2024 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 2024 For Examiners’ Use Section A Section B Total

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 2 of 21 Section A Answer all the questions. 1 (a) (i) Circle all of the quantities in the list below that are scalars. power acceleration displacement energy weight current [1] (ii) Rearrange the following prefixes in order from the smallest value to the largest value. k d T M m [1] (b) Two crewmen pull a boat through a lock with packages, as shown in Fig. 1.1. One crewman pulls with a force of 130 N at an angle of 34 ° relative to the forward direction of the boat. The second crew man, on the opposite side of the lock, pulls at an angle of 45 °. Fig. 1.1 Fig. 1.2 (i) Fig. 1.2 shows the dimension of one package. Suggest a suitable measurement tool to determine the dimension of the package. [1] (ii) If each package has a mass of 3.45 kg, determine the total mass of 75 packages in Mg. total mass = [1] 45° 34° 130 N F 650 mm 1005 mm 330 mm

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 3 of 21 (iii) By means of a scale labelled diagram, determine the size of the resultant force of the two forces. resultant force = [3]

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 4 of 21 2 A block of mass 25.5 kg hangs from a string labelled A, attached to a ceiling, as shown in Fig. 2.1. An identical string labelled B, hangs down from the bottom of the block. Fig. 2.1 (a) The mass is placed on Mars which has a gravitational field strength of 3.7 N kg−1. (i) Explain what is meant by Mars has a gravitational field strength of 3.7 N kg−1. [1] (ii) Determine the weight of the mass on Mars. weight = [1] (b) (i) State and explain which string will break if string B is pulled down slowly. [2] (ii) State and explain which string will break if string B is pulled down with a quick jerk. [2] mass m string A string B

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 5 of 21 3 Fig. 3.1 shows a 0.80 kg ball rolling down a track from position A which is 7.5 m above the ground. There is frictional force along the track and this produces 10.7 J of heat energy. The ball leaves the incline at position B traveling straight upward and reaches a height of 13.0 m above the floor before falling back down. Ignore any effect due to air resistance. Fig. 3.1 (a) Describe the change in energy as the ball moves from A to the highest point. [2] (b) Calculate the energy in the gravitational potential store of the ball at the highest position. energy = [2]

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 6 of 21 (c) Determine the energy in the kinetic store of the ball at position A. energy = [2] 4 Fig. 4.1 shows an equipment being used to measure the pressure of the gas in a flask. Fig. 4.1 (a) State the name of the equipment shown in Fig. 4.1 that is used to measure the pressure of the gas in the flask. [1] (b) (i) The atmospheric pressure is 1.0 × 105 Pa and the density of the water is 1000 kg / m3. The distance between the water levels at P and Q is 190 cm. Determine the pressure of the gas inside the flask. pressure = [2]

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 7 of 21 (ii) The water in the equipment is fully replaced with mercury and connects to the flask with the same gas pressure. The density of mercury is 13 600 kg / m3. Determine the distance between the mercury levels at P and Q. distance = [2] 5 Fig. 5.1 shows a wave pool used for windsurfing training. Plane waves are generated with a wave generator placed at the end of the pool. These waves will travel the whole length of the pool to the opposite end. Fig. 5.1 (a) The wave generator created 50 waves in a minute as shown in Fig. 5.1. (i) Determine the wavelength of the waves. wavelength = [1] 16.0 m velocity wave generator

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 8 of 21 (ii) Hence, calculate the speed of the wave. speed = [2] (b) Fig. 5.2 shows the top view of the wavefronts for the whole pool. The arrows show the direction of the wave motion when the depth of the pool changes. Fig. 5.2 (i) State what is meant by wavefront. [1] (ii) Describe the change in depth of the pool as the waves travels towards the end of the pool. [1] (iii) Explain why this change in direction of the wave motion takes place when the depth of the pool changes. [1]

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 9 of 21 (c) Fig. 5.3 shows components of the electromagnetic spectrum in increasing frequency order. radio waves visible light gamma ray Fig. 5.3 Four components are missing from Fig. 5.3. Complete Fig. 5.3 by adding the names of the missing components. [2] 6 (a) Fig. 6.1 shows a scaled drawing of an object PQ and its image P’Q’ after passing through a thin converging lens. By locating the position of the converging lens and drawing light rays on Fig. 6.1, determine the focal length of the converging lens. Fig. 6.1 (to scale) focal length = [3] (b) Suggest what would happen to the image P’Q’ if (i) the converging lens is replaced by a thicker lens, [1] increasing frequency P P’ Q’ Q

Nan Hua High School Preliminary Examination 2024 Physics 6091/2 Page 10 of 21 (ii) the upper half of the converging lens is covered. [1] 7 A negatively charged polythene rod is held just above a small and light piece of aluminium foil as shown in Fig. 7.1. Fig. 7.1 (a) Draw on the foil in Fig. 7.1 the distribution of charges. [1] (b) Explain your answer given in (a).