ACSI 2020 Y3 IP Physics Paper1

1 Anglo-Chinese School (Independent) FINAL EXAMINATION 2020 YEAR 3 INTEGRATED PROGRAMME PHYSICS PAPER 1 Tuesday 6 October 2020 1 hour INSTRUCTIONS TO STUDENTS Write and shade your index number in the box provided on the OTAS sheet. Do not open this booklet until you are told to do so. INFORMATION FOR STUDENTS 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 using 2B soft pencil to shade in the OTAS sheet provided. Calculators are allowed for this paper. Take g = 10 N/kg or 10 m s-2. There are 16 printed pages.

2 Multiple Choice Questions [40 Marks] 1. Which physical quantity listed below is a scalar quantity? A acceleration B force C mass D velocity 2. A student attempts to measure the period of oscillation of a pendulum in a laboratory which is located at 10 m above sea level. The average value of the period of oscillation is determined to be 1.6 s. He then repeats the same experiment from a height of 5 m above sea level, using a pendulum bob with half the mass but keeping the length of the pendulum constant. Which is the most likely value of the period of oscillation measured in the second attempt? A 0.4 s B 0.8 s C 1.6 s D 3.2 s 3. A student determines the circumference of a golf ball. Which instrument directly measures the circumference of the golf ball? A calipers B micrometer C rule D tape 4. Paths are laid as shown between points X, Y and Z. A person walks along the paths from X to Y to Z and then back to X. What is the value of the total displacement and of the total distance travelled? total displacement / m total distance travelled / m A 0 0 B 0 24 C 24 0 D 24 24 X Y Z 6.0 m 8.0 m 10.0 m

3 5. A car travels along a road. The driver stops the car by pushing his foot down on the brake pedal. What does not change if he pushes harder on the brake pedal? A the braking distance B the braking force C the stopping distance D the thinking distance 6. An object is thrown vertically upwards from point A with an initial velocity. It travels to the highest point B and then falls back to A. Neglecting air resistance, which one of the following statements is incorrect? A The acceleration of the object is constant throughout the motion. B The time for the upward motion is longer than the time for the downward motion. C The total displacement of the object is zero. D The velocity of the object at the highest point is zero. 7. What is the size of the resultant of the two forces shown in the diagram? A 1.0 N B 3.5 N C 5.0 N D 7.0 N stopping distance braking distance thinking distance hazard detected braking begins the car stands still 4.0 N 3.0 N

4 8. The diagram shows the velocity-time graph of an object. Which one of the following statements about the object is true? A It returns to its starting point after 25 seconds. B Its acceleration in the first 10 seconds is 2.0 m s-2. C The object stops moving from t = 10 s to t = 20 s. D The total distance travelled is 250 m. 9. A car is accelerating along a straight, horizontal road. The diagram shows forces acting on the car. Which forces are balanced? A contact forces and air resistance B contact forces and weight C driving force and air resistance D driving force and weight 0 5 10 15 20 25 0 5 10 15 20 25 30 V / m s-1 time / s velocity - time graph driving force air resistance weight contact force contact force

5 10. A body slides up a frictionless slope, as shown. As the body presses on the surface, the surface pushes back on the body. In which direction does the surface push back on the body? 11. An object falls from rest through the air and the air resistance on it increases. The object reaches terminal velocity. Which quantity decreases until its terminal velocity is reached? A acceleration B kinetic energy C speed D weight 12. A spacecraft travels from the Earth to the Moon. At a certain point in the journey, it has zero weight. Why is the weight zero at this point? A The gravitational fields of the Earth and the Moon cancel each other. B The spacecraft leaves the Earth’s gravitational field. C The spacecraft stops moving. D There is no air resistance on the spacecraft. 13. A person of weight 600 N at the bottom of a mountain climbs to the top. The gravitational field strength changes from 10.00 N kg-1 at the bottom to 9.97 N kg-1 at the top. What are his mass and his weight at the top of the mountain? mass at top of mountain / kg weight at top of mountain / N A 60.0 598 B 60.0 600 C 60.1 598 D 60.1 600 direction of motion A B C D

6 14. A turning effect is applied to a tap as shown. What is the magnitude of the resultant moment? A 𝑭𝒅 𝟐 B Fd C 2Fd D 4Fd 15. A wooden trapdoor is hinged along one side and, when closed, is supported on the other side by a ledge. When the trapdoor is closed, the ledge exerts an upward force of 15 N on the trapdoor. What is the weight of the trapdoor? A 1.5 N B 3.0 N C 30 N D 150 N 16. What affects the stability of an object? A only its base area B only its base area and the location of its centre of mass C only its weight and its base area D only the location of its centre of mass trapdoor ledge weight hinge 30 cm 30 cm 15 N pivot d d tap F F

7 17. A student wants to find the centre of mass of a triangular lamina PQR. He drills a small hole at Q. He suspends the lamina from a pin through the hole at Q so that the lamina swings freely. He then hangs a plumb-line from the pin at Q, as shown. He marks the position of the plumb-line on the lamina. To determine the location of the centre of mass, the student then repeats the experiment but with one change. What is the change? A He suspends the lamina from the hole at Q, with R on the left and P on the right. B He suspends the lamina from a pin through a hole at R. C He uses a heavier weight on the plumb-line. D He uses a longer plumb-line. 18. The work done by a force on a body is calculated by multiplying the force by a quantity. Which quantity is this? A The distance travelled in the direction of the force B The distance travelled perpendicular to the direction of the force C The speed in the direction perpendicular to the force D The velocity in the direction of the force 19. A motor is used to lift a load 5.0 m vertically, as shown. The load weighs 40 N. The power of the motor is 200 W and the system is 25% efficient. How long does it take to raise the load? A 0.040 s B 0.25 s C 1.0 s D 4.0 s P Q R motor load 5.0 m 40 N

8 20. The diagram represents a geothermal power station. Which useful energy transformation is taking place? A electrical energy → potential energy B electrical energy → thermal energy C potential energy → electrical energy D thermal energy → electrical energy 21. Bubbles of air, moving from the bottom of a swimming pool to the top surface is shown in the figure below. As the bubble rise, it get larger in size. The change in size of the bubble occurs because A both atmospheric pressure and liquid pressure on the bubble decreases. B atmospheric pressure on the bubble remains same and the liquid pressure on the bubble decreases. C liquid pressure on the bubble increases. D weight of the bubble decreases. bubbles of air Steam and hot water cold water

9 22. The hydraulic system sho