SSS Sc(Chem) Prelim

CA ND IDATE NAM E CE NT RE NU MB ER SERANGOON SECONDARY SCHOOL PRELIMINARY EXAMINATION SECONDARY 4 EXPRESS I s I I I I I SCIENCE (PHYSICS, CHEMISTRY) Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Setter(s): READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. CL ASS INDE X I NU MB ER I I I I I I I 5086/01 28 August 2024 1 hour Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one marie A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Data Sheet is printed on page 20. A copy of the Periodic Table is printed on page 21. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 21 printed pages, including this cover page. BP-277

1 A length of copper wire is labelled: length 0.50 m and diameter 0.50 mm. Which instruments are most suitable to measure accurately the length and the diameter of the wire? length diameter A metre rule digital calipers B metre rule digital micrometer c digital calipers metre rule D digital calipers digital micrometer 2 The diagram shows a distance-time graph for a car travelling in a straight line. In which region is the car decelerating? D distance I m 0 4-�----------------------------� 0 time Is BP-279

3 A measuring cylinder containing water is placed on a balance. A stone is placed into the water. The diagram shows the readings on the balance and on the measuring cylinder. {I What is the density of the stone? A 1. 1 g/cm3 B 1.5 g/cm3 c 4 Newton's third law describes a pair of forces. stone /I 92.5 gl g�j 2.5 g/cm3 D 2.6 g/cm3 Which row shows whether the two forces are of the same type and whether they act on the same object? the type of forces the objects which in the pair they act A different different B different same c same different D same same

5 Each tyre of a car has an area of 250 cm2 in contact with the ground. The car has a mass of 1600 kg. The weight of the car is equally distributed amongst the four tyres. What is the pressure exerted on the ground? The gravitational field strength g is 10 N/kg. A 4.0 N/cm2 B 16 N/cm2 c 40 N/cm2 D 160 N/cm2 6 Some water is heated from room temperature to its boiling point using an electric kettle. What is the principal energy transfer taking place during this period? A internal store to chemical potential store B internal store to kinetic store C chemical potential store to kinetic store D chemical potential store to internal store 7 A 1 kW, 240 V electrical device is switched on. How much energy does it use in 5.0 minutes? A 5000 J B 12 000 J c 72 000 J D 300 000 J BP-281

8 Air is trapped in a metal cylinder by a piston. The piston is free to move and the trapped air is at atmospheric pressure. The cylinder is in hot water. hot water piston trapped air metal cylinder The cylinder is taken out of the hot water and left to cool. What happens to the mass of the air in the cylinder and the position of the piston as it cools? mass of air position of piston A does not change does not change B does not change changes c changes does not change D changes changes BP-282

9 Sound waves are displayed as a trace on the screen of an oscilloscope. Which trace shows a sound that becomes quieter with a higher pitch? A B c D 10 Which characteristics describe the image formed by a plane mirror? A real and upside down B virtual and upright C real and larger than the object D virtual and smaller than the object

11 An object is viewed through a thin converging lens. The diagram shows the paths of two rays from the top of the object to an eye. thin converging lens focal point How does the image compare with the object? A It is larger and inverted. B It is larger and upright. C It is smaller and inverted. D It is smaller and upright. 12 Ultraviolet radiation is a component of the electromagnetic spectrum. Which application uses ultraviolet radiation? A Bluetooth technology B prenatal scanning C sterilising water D thermal imaging eye 13 When the flash on a camera is used, a charge of 1.5 C flows for 0.0030 s through the flash lamp. The average voltage across the flash lamp is 3600 V. What is the energy supplied to the flash lamp and what is the average power supplied? energy I J power /W A 2400 7.2 B 2400 800 000 c 5400 16.2 D 5400 1 800 000 BP-284

14 The diagrams show four circuits. Each circuit contains three 100 0 resistors. Which circuit has the largest current flowing at point X? A B c D 15 A metal wire of length I and cross-sectional area A has resistance R. A second wire is made from the same material. It has a length of 21 and a cross-sectional area 4A. What is the resistance of the second wire? A 8R B 2R 16 The cost of electricity is $0.2989 per kW h. c R 2 D R 8 It takes 0.060 hours and costs 4.0 cents to boil the water in a kettle. What is the power rating of the kettle? A 0.45 kW B 2.2kW c 12 0 kW D 2000 kW

17 A three-pin mains plug contains a fuse. A device with double insulation has a cable connected to the plug. Which part of the plug is not connected to the cable? A earth pin B fuse C live pin D neutral pin 18 One end of each of two bars is marked with an X or a Y, as shown. xl bar 1 bar 2 End X of bar 1 is brought close to the N-pole and then to the S-pole of a magnet. End Y of bar 2 is brought close to the N-pole and then to the S-pole of the magnet. The table shows what happens. end X of bar 1 end Y of bar 2 N-pole of magnet attracted attracted S-pole of magnet attracted repelled What materials are bar 1 and bar 2 made from? bar 1 bar 2 A iron steel B copper steel c steel copper D steel iron

19 A beam of electrons travels through a vacuum. The beam passes between the poles of a magnet as shown. s electrons N What are the directions of the conventional current, the magnetic field, and the force acting on the beam of electrons? direction of the direction of the direction of the force conventional current magne tic field A -7 � into the page B -7 t out of the page c � � out of the page 0 � t into the page 20 1�C is a natural radioactive isotope of carbon and is present in all living things. It has a half-life of 5700 years. The initial mass of this radioactive isotope of carbon in a sample of an old bone is thought to be 448 g. How old is this sample of bone if the mass of the radioactive isotope of carbon in it is found to be 28 g? A 5700 years B 11 400 years c 17 100 years 0 22 800 years BP-287