NTSS Prelim P2

NEW TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 Secondary 4 Express NAME CLASS INDEX NO. PHYSICS 6091 [Revised]/02 Paper 2 22 Aug 2024 1 hour 45 minutes Candidates answer on the Question Paper. 0800 – 0945 Additional Materials: NIL READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black pen on both sides of the paper. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A (70 marks) Answer all questions. Section B (10 marks) Candidates must answer only one out of the two questions. 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. For Marker’s Use Section A Section B Total This document consists of 24 printed pages and 0 blank page.

2 Section A (70 marks) Answer all the questions in the spaces provided. 1 A man stood at the edge of a vertical cliff and he threw a stone vertically upwards. The stone reached its greatest height, fell past the man and hit the bottom of the cliff. The motion of the stone is represented by the velocity-time graph shown in Fig. 1.1. Fig. 1.1 (a) Explain how Fig. 1.1 shows that air resistance has negligible effect on the motion of the stone. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. [1] (b) Based on the data shown in Fig. 1.1, determine the greatest height achieved by the stone. greatest height = ………………………. [2] [Total: 3 marks]

3 2 Fig. 2.1 shows the vertical forces acting on a weather balloon just after lift-off. Fig. 2.1 The balloon experiences an upward force of 95 N. The total weight of the balloon and its contents is 61 N. (a) Determine the total mass of the balloon and its contents. The gravitational field strength g is 10 N/kg total mass = ………………………. [1] (b) Calculate the initial vertical acceleration of the balloon. acceleration = ………………………. [1] (c) As the balloon rises, it experiences air resistance. The upward force remains at 95 N. Explain, in terms of forces acting, why the balloon will reach a constant maximum speed. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. [2] [Total: 4 marks]

4 3 Fig. 3.1 shows a sphere of weight 6.5 N suspended by a wire from point X. The sphere is pulled to one side by a horizontal force F so that the wire makes an angle of 30 with the vertical. Fig. 3.1 (not to scale) Use a scale of 1.0 cm to represent 0.50 N, draw a scale diagram in the space below to determine the magnitude of (a) the tension (TW) in the wire, (b) the horizontal force F. TW = ………………….. F = ………………….. [3] [Total: 3 marks] TW 30 wire string F sphere X

5 4 Fig 4.1 shows a sphygmanometer, a device used to measure blood pressure of a patient using mercury in a manometer. Fig. 4.1 After the doctor has depressed the air bulb, Fig 4.2 below shows an enlarged view of the manometer that is connected to the sphygmanometer. The right arm of the manometer is open and exposed to atmospheric pressure. P is the air pressure that is equal to the blood pressure of the patient. P0 = atmospheric pressure = 1.01 × 105 Pa. Fig 4.2 (a) The doctor observes that h = 115 mm. Calculate the blood pressure of the patient, in Pa. Assume the density of mercury to be 13600 kg/m3. pressure = ………………………. [2] P P0 h mercury manometer [mm Hg] air bulb 90 60 120 180 150

6 (b) The doctor proceeds to draw a liquid vaccine from a bottle. Fig. 4.3 shows a syringe with the vaccine in it. The syringe has a piston A with cross-section area 0.80 cm2 and a nozzle B with a cross sectional area of 0.13 cm2. The pressure of the liquid vaccine is 1.31 × 105 Pa. Fig 4.3 Calculate the force FH required to just push in piston A. Assume atmospheric pressure = 1.01 × 105 Pa. Force FH = ………………… [2] (c) Explain, without calculation, how the magnitudes of the force at the piston A, FA differs from the force at the nozzle B, FB. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. [2] [Total: 6 marks] FH piston A nozzle B liquid vaccine

7 5 Fig. 5.1 shows a roller coaster of weight 5000 N and initially at rest at a height of 15.0 m above the ground. It is then released from rest and it rolls along the track for 50.0 m before it comes to a momentary rest at point X which is 11.0 m above the ground. The track feels warm after the roller coaster rolls past. Fig. 5.1 (a) Ignoring loss of energy to the surroundings through other means, determine the work done against friction as it rolls from its initial rest position to point X. work done against friction = …………………………. [2] (b) Determine the frictional force (assumed constant throughout) that acts between the roller coaster and the track. frictional force = …………………………. [2]

8 (c) A motor (not shown in Fig. 5.1) was used to raise the roller coaster from ground level to its initial rest position 15 m above ground level. Given that the motor takes 30 s to do so, what is the power dissipated by the motor? (Ignore energy lost to the surroundings as heat or sound). Power = …………………………. [2] [Total: 6 marks] 6 (a) Table 6.1 shows the wavelength of four electromagnetic waves. Type of wave wavelength infrared wave 0.18 mm A 0.5 µm B 10 cm C 1100 m Table 6.1 Which of the waves, A, B or C, is visible light? ………….……………………………………………………………………………………….…... [1] (b) A television station broadcasts its programmes at 5 x 103 kHz. (i) Name the electromagnetic wave used for television broadcast. ……………………………………………………………………………………………….. [1] (ii) Calculate the wavelength of the wave. wavelength = …………………………. [2]

9 (c) Stars emit all types of electromagnetic waves. Telescopes that monitor X-rays are mounted on satellites in space. Suggest why would an X-ray telescope based on Earth not be able to detect X-rays emitted from distant stars. ………….……………………………………………………………………………………….…... ………….………………………………………………………………………………….………... [1] [Total: 5 marks] 7 Fig. 7.1 shows an object placed in front of a converging lens. Fig. 7.1 (a) On Fig. 7.1, draw two rays from the top of the object to locate and label the position of the image I. Hence, complete the path for ray P. [3] (b) Describe two changes to the new image if the object is shifted closer to the lens. ………….……………………………………………………………………………………….…... ………….………………………………………………………………………………….………... [1] [Total: 4 marks]

10 8 Fig. 8.1 shows a solenoid connecte