Sec 4 Science Physics SA2 2018 North Vista

2 1 The diagram shows a simple pendulum. It swings between X and Z. What sequence should be timed to measure the period of the pendulum? A X Æ Y C X Æ Z Æ Y B X Æ Z D X Æ Z Æ X 2 The diagram shows a vernier V placed against a scale S. What is the vernier reading? A 5.23cm C 5.36cm B 5.33cm D 5.63cm 3 The graph shows how the distance travelled by a motorcycle changes with time. Which statement is correct? A at P, the motorcycle is decelerating B at Q, the motorcycle has constant acceleration C at R, the motorcycle is slowing down D at S, the motorcycle has constant speed ZX motion S V 0 5 10 5 6 distance time0 P Q R S Y 5018 Sec 4 Science Physics SA2 - North Vista www.KiasuExamPaper.comwww.KiasuExamPaper.com 193

3 4 The wheel of a moving car is driven by the engine. The car is accelerating in the direction shown. In which direction does the frictional force between the wheel and the road surface act? 5 An object with a mass of 15kg on the Earth is taken to Mars. The gravitational field strength on the Earth is 10N/kg and on the Mars is 3.7N/kg. What are the mass and weight of the object on the Mars? mass / kg weight / N A 15 56 B 15 150 C 41 15 D 41 150 6 A chair weighing 50N stands on four legs, each having an area of contact of 0.0020m2. What is the pressure of the chair on the floor? A 6250Pa C 12 500Pa B 10 000Pa D 25 000Pa 7 When a 200N force is applied to a box weighing 400N, the box mo ves 2.0m horizontally in 20s. What is the average power? A 20W C 60W B 400W D 1200W A B D C wheel road surface direction of acceleration of car 2.0m 200N 400N www.KiasuExamPaper.comwww.KiasuExamPaper.com 194

4 8 The diagrams show cross-sections of four solid objects. Which object is the least stable? 9 A student has a large tank of water in which he wants to set up a convection current. Which arrangement would not allow him to do this? A cooling at X C heating at Y B heating at X D heating at Z 10 A solid is heated. Which statement is incorrect? A The average distance between the molecules increases. B The average speed of the molecules increases. C The molecules expand. D The molecules gain energy. 11 It takes 0.20s to generate one complete wave in a ripple tank. The wavelength of each wave produced is 4.0cm. What is the speed of the wave? A 0.80cm/s B 1.3cm/s C 5.0cm/s D 20cm/s water Z X Y A B C D www.KiasuExamPaper.comwww.KiasuExamPaper.com 195

5 12 The diagram shows an object placed in front of a plane mirror. Which diagram shows the correct mirror image of the object as seen in the plane mirror? A B C D 13 A projector has a converging lens that projects an image from the visualiser onto a screen. What type of image is produced? A real, inverted, magnified B real, upright, same size C virtual, inverted, same size D virtual, upright, magnified 14 Which of the following sets of electromagnetic waves have highe r frequencies than visible light? A Radio waves, infrared radiation, ultraviolet radiation B Radio waves, microwaves, infrared radiation C X-rays, gamma rays, ultraviolet radiation D X-rays, microwaves, infrared radiation 15 The diagram shows a cathode-ray oscilloscope trace for a note emitted by a guitar. If the same note is played again, but softer, how will the trace change? A The peaks will be closer together. B The peaks will be further apart. C The peaks will be higher. D The peaks will be lower. www.KiasuExamPaper.comwww.KiasuExamPaper.com 196

6 16 Which diagram shows the incorrect electric field lines between 2 charged objects? A C B D 17 A 0.40m length of resistance wire with a cross-sectional area of 0.20mm2 has a resistance of 2.0Ÿ. Which wire of the same material will also have a resistance of 2.0Ÿ? wire length / m area / mm 2 A 0.20 0.20 B 0.20 0.40 C 0.80 0.10 D 0.80 0.40 18 An electric oven is connected to the mains supply using insulated copper wires. The wires become very warm. What can be done to reduce the amount of heat produced in the insulated copper wires? A use thicker copper wires B use thicker insulation C use thinner copper wires D use thinner insulation www.KiasuExamPaper.comwww.KiasuExamPaper.com 197

7 X Y 19 What are the poles of the electromagnet at X and Y? XY A North North B North South C South North D South South 20 The diagram shows the magnetic field pattern between two bar magnets. Which two bar magnets produce this pattern? A B C D X Y magnet magnet S N S N S N N S N S S N N S NS www.KiasuExamPaper.comwww.KiasuExamPaper.com 198

2 Section A (45 marks) Answer all the questions in the spaces provided. 1 Fig. 1.1 shows a stone supported by two strings. The tensions in the two strings are 3.0N and 4.0N. Fig. 1.1 (not to scale) (a) In the space below, draw a labelled diagram to show the resulta nt of the two tensions. [2] Determine the size and direction of the resultant force. scale: ......................... [1] resultant force = …………………….N [1] direction of resultant force = ......................................................................... [1] (b) State the weight of the stone. weight = ...........................N [1] 4.0N 3.0N horizontal 45° h75° stone www.KiasuExamPaper.comwww.KiasuExamPaper.com 199

3 2 A boy pulls a crate along a table with a force P, as shown in Fig. 2.1. When the crate is moving, there is a frictional force of 1.0N acting as shown. Fig. 2.2 shows how the acceleration, a of the crate varies with P. Fig. 2.1 Fig. 2.2 (a) Explain why P must be greater than 1.0N for the crate to accelerate. …………………………................................................................................................... ………………………….............................................................................................. [1] (b) By using P = 6.0N in Fig. 2.2, calculate the mass of the crate,m. m = ………………………… kg [2] (c) The force P is reduced to 1.0N. State and explain what happens to the crate. …………………………................................................................................................... …………………………................................................................................................... ………………………….............................................................................................. [2] 1.0N P 0 1.0 2.0 3.0 4.0 5.0 6.0 P/N a m/s2 0.5 01 0 1.0 1.5 crate www.KiasuExamPaper.comwww.KiasuExamPaper.com 200

4 3 The 'torture tool' shown in Fig. 3.1 was used in medieval times as an instrument of torture by lowering the victim, strapped to the seat, into the cold wat er of the sea. The total mass of the torture tool is 120kg. The torture tool can be balanced, when no victim is present, by a flat stone of mass 100kg placed at a distance of 2.0m fro