ACSI 2024 Promo HL Phys P1A

This paper consists of 16 printed pages (including cover page). END-OF-YEAR EXAMINATION 2024 YEAR 5 IB DIPLOMA PROGRAMME PHYSICS (HIGHER LEVEL) PAPER 1A Monday 23 September 2024 2 hours INSTRUCTIONS TO STUDENTS Write your index number in the provided OTAS sheet. Do not open this booklet until you are told to do so. There are 40 questions. Answer all the questions. For each question, choose the answer you consider to be the best and indicate your choice on the answer sheet provided. The maximum mark for paper 1A is [40 marks]. The maximum mark for paper 1A and 1B is [60 marks]. The combined time for both Paper 1A and Paper 1B is 2 hours. INFORMATION FOR STUDENTS Data booklet will be provided. Calculators are allowed for this paper. Index Number Name

2 1 An object is sliding from rest down a frictionless inclined plane. The object slides 1.0 m during the first second. What additional distance will the object slide during the next second? A 1.0 m B 2.0 m C 3.0 m D 4.9 m 2 A ball is thrown horizontally at a speed of 15 m s−1 from the top of a cliff that is 80 m above the surface of the sea. Air resistance is negligible. What is the distance from the bottom of the cliff to the point where the ball lands in the sea? A 45 m B 61 m C 80 m D 240 m 3 A balloon rises at a steady vertical velocity of 10 m s–1. An object is dropped from the balloon at a height of 40 m above the ground. Air resistance is negligible. What is the time taken for the object to hit the ground? A 10 s B 5.1 s C 4.1 s D 2.1 s

3 4 A projectile is launched at an angle above the horizontal with a horizontal component of velocity Vh and a vertical component of velocity Vv . Air resistance is negligible. Which graphs show the variation with time of Vh and of Vv?

4 5 The graph shows how an external force applied to an object of mass 2.0 kg varies with time. The object is initially at rest. What is the speed of the object after 0.60 s? A 7.0 m s−1 B 14.0 m s−1 C 18.0 m s−1 D 28.0 m s−1 6 A mass is released from the top of a smooth ramp of height h. After leaving the ramp, the mass slides on a rough horizontal surface. The mass comes to rest in a distance d. What is the coefficient of dynamic friction between the mass and the horizontal surface? A gd h B 2 d gh C d h D h d

5 7 A person with a weight of 600 N stands on a scale in an elevator. What is the acceleration of the elevator when the scale reads 900 N? A 4.9 m s−2 downwards B 1.5 m s−2 downwards C 1.5 m s−2 upwards D 4.9 m s−2 upwards 8 An object of mass 8.0 kg is falling vertically through the air. The drag force acting on the object is 60 N. What is the best estimate of the acceleration of the object? A zero B 2.3 m s−2 C 7.5 m s−2 D 10 m s−2 9 X and Y are two objects on a frictionless table connected by a string. The mass of X is 2 kg and the mass of Y is 4 kg. The mass of the string is negligible. A constant horizontal force of 12 N acts on Y. What are the acceleration of Y and the magnitude of the tension in the string? Acceleration of Y/ m s−2 Tension in the string/ N A 2 4 B 2 6 C 3 4 D 3 6

6 10 An object of mass 2 m moving at velocity 3 v collides with a stationary object of mass 4 m. The objects stick together after the collision. What is the final speed and the change in total kinetic energy immediately after the collision? Final speed Change in total kinetic energy A v 3 mv2 B v 6 mv2 C 2v 3 mv2 D 2v 6 mv2 11 A waiter carrying a tray is accelerating to the right as shown in the image. What is the free- body diagram of the forces acting on the tray? 12 A force of magnitude F1 accelerates a body of mass m from rest to a speed v. A force of magnitude F2 accelerates a body of mass 2m from rest to a speed 2v. The ratio work done by 𝐹2 work done by 𝐹1 is A 2 B 4 C 8 D 16

7 13 A car takes 20 minutes to climb a hill at constant speed. The mass of the car is 1200 kg and the car gains gravitational potential energy at a rate of 6.0 kW. What is the height of the hill? A 0.6 m B 12 m C 612 m D 6100 m 14 A cyclist rides up a hill of vertical height 100 m in 500 s at a constant speed. The combined mass of the cyclist and the bicycle is 80 kg. The power developed by the cyclist is 200 W. What is the efficiency of the energy transfer in this system? A 8 % B 28 % C 58 % D 78 % 15 A bar rotates horizontally about its center, reaching a maximum angular speed in six complete rotations from rest. The bar has a constant angular acceleration of 0.11 rad s−2. What is the final angular speed of the bar? A 2.0 rad s−1 B 2.9 rad s−1 C 4.1 rad s−1 D 8.3 rad s−1 16 A uniform metre rule of mass 100 g is supported by a knife-edge at the 40 cm mark and a string at the 100 cm mark. The string passes round a frictionless pulley and carries a mass of 20 g as shown in the diagram. At which mark on the rule must a 50 g mass be suspended so that the rule balances? A 4 cm B 36 cm C 44 cm D 96 cm

8 17 Two stars X and Y are at different distances from an observer. Star X has a radius twice that of Star Y. The surface temperature of Star X is half of Star Y. Star X is also three times further away from the observer than Star Y. What will be the ratio 𝑏𝑟𝑖𝑔ℎ𝑡𝑛𝑒𝑠𝑠 𝑜𝑓 𝑆𝑡𝑎𝑟 𝑋 𝑏𝑟𝑖𝑔ℎ𝑡𝑛𝑒𝑠𝑠 𝑜𝑓 𝑆𝑡𝑎𝑟 𝑌 ? A 36 1 B 1 36 C 6 1 D 1 6 18 A container filled with an ideal gas is at a temperature of 80 C. The average speed of the gas molecules is 350 m s-1. The temperature of the gas is increased to 160 C. What is now the average speed of the gas molecules? A 390 m s-1 B 430 m s-1 C 490 m s-1 D 700 m s-1 19 The diagram shows the incident and radiated intensities of the solar radiation on a region of the Earth’s surface. What is the albedo of the region? A 0.82 B 0.23 C 0.19 D 1 20 The average intensity of the solar radiation incident at right angle to the surface of a planet is 360 W m-2. The emissivity of the planet is 0.60. What is the surface temperature of the planet? A 355 K B 321 K C 282 K D 169 K 21 An ideal gas has an internal energy U at 0C. The gas is heated to 273C. What is the internal energy of the gas at 273C? A √2 U B 2 U C 4 U D 273 U 800 Wm-2 650 W m-2 Earth’s surface

9 22 One mole of an ideal gas at atmospheric pressure 1.0  105 Pa and temperature 300 K occupies a volume of 0.025 m3. The pressure and temperature of the gas are raised to 5.0  105 Pa and 600 K. What is the volume that the gas occupies? A 0.010 m3 B 0.025 m3 C 0.050 m3 D 0.063 m3 23 A positive amount of thermal energy Q is transferred to an ideal gas from its surroundings. The internal energy of the gas increases and the gas does a positive amount of work W on its surroundings. The change of state of the gas is A isochoric (isovolumetric), B isobaric. C isothermal. D adiabatic. 24 A fixed mass of gas undergoes changes of pressure and volume as shown. When the gas is taken from state P to state Q by the stages PR and RQ, 3 J of work is done by it and there is a thermal transfer of 8 J of energy into it. When the same resultant change is achieved by stages PS and SQ, 1 J of work is done by the gas. In this case, what is the thermal transfer of energy? A 4 J out of the gas B 6 J into the gas C 8 J into the gas D 10 J into the gas pressure volume P R Q S

10 25 A beaker contains water at a higher temperature than its surroundings. Which of