2012 WSSS MYE with ANS

1 West Spring Secondary School Thirst for Knowledge MID YEAR EXAMINATIONS 2012 PHYSICS 5058 SECONDARY 4 EXPRESS NAME ________________________________ ( ) DATE 09 May 12 CLASS __________ DURATION 2 h 15 min Instructions to Candidates Section A (20 Marks) There are twenty questions in Section A. 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. Section B (50 Marks) and Section C (30 Marks) Answer all questions in the question paper on the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. Candidates are reminded that all quantitative answers should include appropriate units. 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. 100 Take g to be 10 m/s2. For Examiner’s Use SETTER: Mr Prakash This document consists of 21 printed pages including this cover page. [ Turn Over ]

2 Section A (20 Marks) 1 A pair of vernier callipers is used to measure the diameter of a boiling tube. Diagram 1 shows the vernier scale when the jaws of the vernier callipers are closed. Diagram 2 shows the vernier scale when the boiling tube is clamped between the jaws of the vernier callipers. What is the correct value of the diameter of the boiling tube? A 1.23 cm B 1.25 cm C 1.27 cm D 1.31 cm 2 The graph shows the speed-time graph of a pendulum bob. What is the period of the oscillation of the pendulum bob? A 0.5 s B 1.0 s C 1.5 s D 2.0 s 3 A helicopter of mass 1000 kg rises vertic ally upwards with a uniform speed of 2 m/s. What is the resultant force exerted on the helicopter as it rises? A 0 N B 500 N C 2000 N D 10000 N 4 A bottle full of water has a mass of 250 g. When the same bottle is filled with liquid X, the mass becomes 160 g. The mass of the empty bottle is 100 g and the density of water is 1.0 g/cm3. What is the density of liquid X? A 0.36 g/cm3 B 0.40 g/cm 3 C 1.07 g/cm 3 D 2.50 g/cm 3 Diagram 1 Diagram 2

3 5 A car of total mass 850 kg slows down from 25 m/s to 12 m/s with a constant deceleration in 5 s. What is the work done against the braking force? A 11 kJ B 110 kJ C 204 kJ D 266 kJ 6 Diagram 1 shows a mercury barometer and diagram 2 shows a mercury manometer placed in the same room. What is the pressure of the gas? A 15 cm Hg B 40 cm Hg C 75 cm Hg D 90 cm Hg 7 The diagram shows a si mple hydraulic jack. Which of the following modification will enable heavier loads to be lifted? Ruler in cm Ruler in cm Diagram 1 Diagram 2

4