NYGH 2012-S3-EOY-P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2012 Secondary Three Physics 45 minutes Paper 1 Multiple Choice 8:45 – 9:30 Monday 15 Oct 2012 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Multiple Choice Answer Sheet provided. There are thirty questions in 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 answer sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. Take the acceleration due to gravity, g, to be 10 m s-2 or 10 N kg-1 Setter: BN, CMH & TW This document consists of 12 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2012 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: BN, CMH &TW Physics I 1 Which of the following shows a base physical quantity with its correct SI unit? Base Physical Quantity SI unit A electric current volt B mass gramme C temperature degree celsius D amount of substance mole 2 The unit newton (N) is equivalent to A kg m s-1. B kg m s-2. C kg m-1 s-1. D kg m-1 s-2. 3 Acceleration can be calculated using A change in velocity ÷ time taken. B distance ÷ time. C force x mass. D average speed x time. 4 A ticker-timer tape is attached to a trolley that is accelerating down an inclined runway at 0.50 m s-2. The diagram shows part of the tape and the distance between successive dots. What is the vibrating frequency of the ticker-timer? A 5 Hz B 10 Hz C 50 Hz D 100 Hz 5 The table below shows the variation with time t of the distance s travelled by an object along a straight level surface. t / s 0 1.0 2.0 3.0 4.0 5.0 s / m 0 2.0 6.0 12.0 20.0 30.0 Which of the following statements about the motion of the object is correct? A The velocity of the object is increasing with decreasing acceleration. B The velocity of the object is increasing with constant acceleration of 1.0 m s-2. C The velocity of the object is increasing with constant acceleration of 2.0 m s-2. D The velocity of the object is increasing with increasing acceleration. 5 mm 10 mm 15 mm

2012 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setter: BN, CMH &TW Physics I [Turn over 6 A body is dropped from rest at height X and falls freely past height Y. 2.0 s after passing height Y, it passes height Z. If the difference in height between Y and Z is 150 m, find the time for the body to fall from X to Z. A 5.5 s B 6.5 s C 7.5 s D 8.5 s 7 A bag is dropped out from a hot air balloon when the balloon is ascending at a velocity of 5.0 m s-1. Which of the following graphs best shows how the velocity v of the bag varies with time t ? A B C D t / s v / m s-1 0 t / s v / m s-1 5.0 0 t / s v / m s-1 5.0 0 t / s v / m s-1 0 Y X 150 m Z

2012 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setter: BN, CMH &TW Physics I 8 An object is thrown vertically upwards in air. Taking velocity in the upwards direction as positive, which of the following graphs best represents the variation of acceleration a with time t for the object before it hits the ground? A B C D 9 A body is moving in a straight line under the action of a constant force. What change will occur to the body? A Change in kinetic energy. B Change in mass. C Change in acceleration. D Change in inertia. 10 A small submarine of mass 1000 kg sinks in water with a uniform speed of 2.0 m s-1. What is the upward force acting on the submarine as it sinks? A 0 N B 500 N C 1000 N D 10 000 N 11 A block of mass 20.0 kg is placed on a horizontal surface. When a horizontal force of 40 N is applied on the block, it move s with a constant velocity of 2.0 m s -1. What is the acceleration of the block if the applied force is increased to 140 N? A 3.0 m s-2 B 5.0 m s-2 C 6.0 m s-2 D 25 m s-2 submarine 2.0 m s-1 t a 0 t a 0 t a 0 t a 0

2012 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: BN, CMH &TW Physics I [Turn over 12 What is the tension of the cable holding a lift of mass 450 kg that is ascending with a deceleration of 2.0 m s-2? A 900 N B 3600 N C 4500 N D 5400 N 13 Which of the following phenomena can be explained using Newton’s 3 rd Law of Motion? (i) A man swims across a pool by pushing the water with his limbs. (ii) A passenger in a car moves forward when the car suddenly stops. (iii) A coin and a feather fall with the same acceleration in a vacuum. (iv) A space shuttle travels through space to the moon by ejecting the burning fuel. A (i) only B (i) and (iii) only C (i) and (iv) only D (i), (ii) and (iv) only 14 An object is attached to the end of a string and rotated at a constant speed in a horizontal plane. Which of the following statements correctly describes the motion of the object? A The acceleration of the object is constant. B The direction of travel of the object is constant. C The displacement of the object after 1 complete revolution is zero. D The force acting on the object is along the circumference of the circle. object string

2012 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setter: BN, CMH &TW Physics I 15 A sphere of density 1.0 g cm-3 is dropped from position P into a container of water. Assuming that the density of the water is 1.0 g cm -3, which of the following outcomes is not possible? A The sphere will rest at the bottom of the container. B The sphere will float in the middle of the container. C The sphere will float just under the surface of the water. D The sphere will hit the bottom of the container with a non-zero speed. 16 A student made a balancing toy using wires and plasticine and pivoted it on a stand as shown in Diagram 1. When the toy was tilted slightly as shown in Diagram 2, the toy stayed at that tilted position and neither toppled nor returned to the position shown in Diagram 1. This was because the centre of gravity of the toy is A exactly at the pivot. B vertically above the pivot. C vertically below the pivot. D inside the plasticine. Diagram 2 wire stand plasticine Diagram 1 pivot water P

2012 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setter: BN, CMH &TW Physics I [Turn over 17 The diagram below shows a pair of tongs that can be used to pick up a load. A force FE is applied at the handle to exert a force FL on the load. The tongs will exert force FL on the load that is A equal in magnitude to FE. B 0.40 times the magnitude of FE. C 2.0 times the magnitude of FE. D 2.5 times the magnitude of FE. 18 It seems easier to climb to the top of a steep hill using a zigzag path instead of climbing in a straight line from the bottom directly to the top of the hill. This is because A less time is needed. B less friction has to be overcome. C less energy is needed. D less power is needed. 19 A 60 W lamp converts 75 % of its electrical energy into light energy. What is the amount of light energy given out in 2.0 minutes? A 90 J B 1800 J C 5400 J D 7200 J 20 The diagram shows two divergent rays of light from