NYGH 2020-S3EOY-IP Physics P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2020 Secondary Three PHYSICS 45 minutes Paper 1 Multiple Choice 08:45 – 09:30 Wednesday 14 October 2020 Additional materials: Optical Answer Sheet (OAS) READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page. Do not use staples, paper clips, highlighters, glue or correction fluid on the Multiple Choice Optical Answer Sheet (OAS) provided. Write in soft pencil your name, class and register number on the Optical Answer Sheet. 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 shade the lozenge of your choice in soft pencil on the Optical Answer Sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. The use of an approved scientific calculator is expected, where appropriate. Any rough working should be done in this booklet. The acceleration due to gravity (or gravitational field strength) g is taken to be 10 m s−2 (or 10 N kg−1) near the Earth’s surface. Setters: AJL & TPY This document consists of 16 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2020 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: AJL & TPY Physics I 1 The diagrams below show the zero error for a micrometer screw gauge and its scale when a ball bearing is placed between the spindle and anvil. What is the correct diameter of the ball bearing? A 4.39 mm B 4.93 mm C 4.47 mm D 4.97 mm 2 The time taken for a pendulum to swing from its rest position X to its maximum displacement position Y is 1.5 s. What is the frequency of the pendulum? A 0.17 Hz B 0.33 Hz C 3.0 Hz D 6.0 Hz 3 The Earth’s mass is 5.94 × 1024 kg and its volume is 1.08 × 1012 km3. What is the Earth’s average density? A 5.50 × 103 kg m-3 B 5.50 × 109 kg m-3 C 5.50 × 106 kg m-3 D 5.50 × 1012 kg m-3 zero error scale with ball bearing 0 2 3 4 45 40 45 0 X Y

2020 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: AJL & TPY Physics I [Turn over 4 Which of the following has the highest average speed? A A cyclist completes a 15 km race in a time of 2 hours and 15 minutes. B A runner completes an 800 m race in 1 minute and 57 seconds. C A yacht sails 7.0 km of a race in 1 hour 10 minutes. D A windsurfer travels 1.2 km in 6 minutes. 5 Which of the following is/are NOT a uniformly accelerated motion? (1) A feather falls from a height in a vertical tube from which the air has been removed. (2) A ball moves on a frictionless horizontal surface in a straight line at a uniform speed. (3) A coin falls from a height in air and air resistance is negligible. A (1) only B (2) only C (1) and (3) only D (2) and (3) only

2020 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: AJL & TPY Physics I 6 The following is the displacement-time (s-t) graph for an object. Which graph is its corresponding velocity-time (v-t) graph? A B C D

2020 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: AJL & TPY Physics I [Turn over 7 A car starts from rest and moves with decreasing acceleration until it reaches a constant speed. Which graph shows how the velocity of the car varies with time? A B C D 8 When an object falls in the Earth's gravitational field, it finally reaches a steady velocity. Which statement can explain this observation? A The air resistance acting on the object increases as it falls. B The mass of the object is unchanged as it falls. C The Earth's gravitational field decreases as it falls. D The weight of the object increases as it falls. 9 A motorist travelling at 2.0 m s-1 can bring his car to rest in a distance of 10 m. If he had been travelling at 6.0 m s-1, in what distance could he bring the car to rest using the same braking force? A 17 m B 52 m C 30 m D 90 m 0 t v 0 v t 0 v t 0 v t

2020 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: AJL & TPY Physics I 10 A driver driving at 100 km h −1 on a straight highway sees a road -block 100 m in front of her. There is a reaction time of 0.50 s and then she steps on the brakes. If she wants to stop in front of the road-block, what is the minimum deceleration of the car? A 3.4 m s-2 B 3.9 m s-2 C 4.3 m s-2 D 4.5 m s-2 11 An object released from rest on a planet requires 1.0 s to fall a distance of 6.0 m. What is the acceleration due to gravity on this planet? A 3.0 m s-2 B 6.0 m s-2 C 12 m s-2 D 15 m s-2 12 A 1.0 kg stone is thrown at 10 m s-1 vertically upward. Neglecting air resistance, what is the net force that acts on the stone when it is halfway to the highest point? A 0.50 N B 1.0 N C 5.0 N D 10 N 13 The graphs below show how the displacement s, velocity v and acceleration a of three different objects change with time. Which graphs show a constant resultant force acting on each object? (1) (2) (3) A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3) a t v t s t

2020 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: AJL & TPY Physics I [Turn over 14 A tow truck pulls a broken-down car of mass 1000 kg and moves at a constant velocity of 9.0 m s-1 along a horizontal road. The resistive force acting on the car is 500 N. What is the tension in the cable connecting the truck and the car? A 0 N C 9000 N B 500 N D 9500 N 15 A 5.0 kg box P is placed on top of a 10.0 kg box Q. There is no friction between P and Q, and the table surface is smooth. A 15 N horizontal force pulls box Q to the right. What is the initial acceleration of P and of Q? initial acceleration of P / m s−2 initial acceleration of Q / m s−2 A 0 1.5 B 1.0 1.0 C 0 1.0 D 1.5 1.5 P Q 5.0 kg 10.0 kg 15 N table

2020 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: AJL & TPY Physics I 16 An object M has three forces acting on it as shown below. Which arrow shows the direction of the resultant force acting on M? 10 N 50 N 30 N M A M B C D

2020 End-of-Year Examination Secondary Three 9 Nanyang Girls’ High School Setters: AJL & TPY Physics I [Turn over 17 A 100 g non-uniform metre ruler is pivoted off-centre at the 15.0 cm mark. It is balanced with a 450 g load hanging at the 5.0 cm mark. Where is the centre of gravity of the ruler? A at the 35.0 cm mark B at the 45.0 cm mark C at the 50.0 cm mark D at the 60.0 cm mark 18 The diagram below shows the cross-sections of 2 identical light cylindrical bottles X and Y filled with water. Both bottles are at rest on top of a table. Which of the following correctly describes the type of equilibrium for bottles X and Y? X Y A stable unstable B unstable stable C neutral stable D neutral unstable 0.0 cm 450 g 5.0 cm 15.0 cm water X Y table water 100.0 cm

2020 End-of-Year Examination Secondary Three 10 Nanyang Girls’ High School Setters: AJL & TPY Physics I 19 A triangular piece of aluminium sheet of uniform thickness has a triangular hollow in the middle. It is balanced on a vertical knife edge as s