2019 S4 EOY P1 2019 S4 EOY P1 2019 S4 EOY P1 1 / 30 Which group contains three vector quantities? displacement, acceleration, force displacement, velocity, pressure force, work done, pressure velocity, acceleration, power 2 / 30 A cyclist accelerates down a hill and then travels at constant speed before decelerating as he climbs back up another hill. Which graph shows how the distance s travelled by the cyclist varies with time t? 3 / 30 A man stands on the edge of a cliff. He throws a stone upwards with a velocity of 20 m s–1 at time t = 0 s. The stone reaches the top of its trajectory after 2.0 s and then falls towards the bottom of the cliff. Air resistance is negligible. Which row shows the correct velocity v and acceleration a of the stone at different times? D A C B 4 / 30 In a 1.0 km run, a student starts from S and ends at T as shown in the diagram below. What is the magnitude of her displacement? 119 m 200 m 600 m 400 m 5 / 30 A sky-diver jumps from an aircraft. The Earth exerts a downward force FE on the sky-diver who also exerts an upward force FS on the Earth. Which statement is correct? the magnitude of FE < the magnitude of FS the magnitude of FE > the magnitude of FS the magnitude of FE = the magnitude of FS, but the net force on the sky-diver may not be zero the magnitude of FE = the magnitude of FS, hence the net force on the sky-diver must be zero 6 / 30 Two objects A (mass 1.0 kg) and B (mass 2.0 kg) are connected by a non-extendable string over a smooth pulley. Object A is pulled along the smooth bench with a force of 23 N. What is the acceleration of object B? 7.7 m s–2 13 m s–2 23 m s–2 1.0 m s–2 apply F=ma to objects A and B separately: 23 - T = 1a & T - 20 = 2a, solve for a. 7 / 30 A lady of weight W stands inside a lift. The lift is moving upwards at a constant acceleration. Let the normal contact force exerted on the lady by the floor be R. Which of the following statements is/are correct? (1) R is greater than W in magnitude. (2) R and W are in opposite directions. (3) R and W form an action-and-reaction pair according to Newton's third law of motion. (1) and (3) only (1) and (2) only (1), (2) and (3) (2) and (3) only R is upwards. Lift moves up with acceleration, so R > W. Both R and W act on the lady, not action-reaction pair. 8 / 30 A ladder of weight W rests against a vertical wall. Friction between the ladder and the ground and also between the ladder and the wall prevents the ladder from slipping. Which diagram shows the possible directions of the forces on the ladder? C D A B force by wall on ladder: add friction upwards & normal contact force to right; force by ground on ladder: add friction to left & normal contact force upwards. 9 / 30 A car of mass 1000 kg is moving at 20 m s–1 along a level road. When its brakes are applied, the car slows down to 10 m s–1. How much energy is converted to thermal energy and then lost to the surroundings? 150 kJ 200 kJ 300 kJ 50 kJ 10 / 30 The diagram shows a jar, with dimensions shown, containing a liquid of mass 3.0 kg and density 600 kg m-3. The liquid exerts a pressure on the base of the jar. What is the pressure exerted by the liquid on the base of the jar? 3.0 × 103 Pa 1.2 × 105Pa 3.0 × 106 Pa 1.2 ×103 Pa 11 / 30 (not tested - no longer in syllabus) 2019 S4 EOY P1 Q11 The pressure of a gas in a piston is 150 kPa when the volume of the gas is 10 cm³. The volume is increased and the pressure of the gas falls to 120 kPa. By how much is the volume increased? 13 cm³ 8.0 cm³ 1.8 cm³ 2.5 cm³ 12 / 30 The diagram shows an illuminated object O placed in front of a plane mirror MN. X is the image of O. Which statement describing the diagram is correct? The angle of incidence of the light ray from O at the mirror is 41º. X is a real image. X is brighter than O. X will move closer towards the mirror if O is placed closer to the mirror. 13 / 30 XY is a ray of light incident on a parallel-sided glass block. Which one of the light rays A, B, C or D most likely represents the path of the ray emerging from the block after refraction? B C A D 14 / 30 A microphone connected to an oscilloscope receives the note emitted by a tuning fork and gives a pattern on the oscilloscope as shown in the figure below. The four patterns below are produced by four musical instruments. Which of them has the same pitch as the tuning fork? 15 / 30 Which statement is not true about electromagnetic waves? They obey the Laws of Refraction. Their frequencies do not change when they travel from one medium to another. Their speed in vacuum is 3.0 x 105 km s–1. They move in a circular path in a magnetic field. 16 / 30 The diagram below shows a wave profile travelling towards the right along a string at a particular instant of time. W, X, Y and Z are four particles on the string. Which row correctly describes the speed and direction of motion of W, X, Y and Z at the instant shown above? A D C B 17 / 30 Which of the following describes ultrasound? sound waves which have a frequency less than 20 Hz sound waves which have a frequency greater than 20 kHz sound waves which have a frequency greater than 20 MHz sound waves which have a frequency greater than 20 Hz 18 / 30 An insulated metal sphere X carries positive charges initially and an insulated metal sphere Y is brought near X. After connecting a conducting wire between spheres X and Y, sphere Y is earthed as shown in the diagram below. Which of the following statements is/are correct? (1) Sphere Y will be neutral. (2) Positive charges will flow from X to the earth. (3) Only half of the positive charges will flow from X to Y. (3) only (1) only (2) and (3) only (1) and (3) only 19 / 30 The graph shows the variation with potential difference (p.d.) V of the current I in an electrical component. The resistance of the component is measured to have the values: RX, when the current is IX and RY, when the current is IY. What is the difference between the resistance values of RX and RY? zero 20 / 30 The diagram shows a network of resistors R1, R2 and R3 connected to a battery. When the switch S is closed, what happens to the potential difference (p.d.) across R1 and across R3? A B D C 21 / 30 An electrical heater is used to produce thermal energy in a fixed period of time. To reduce the thermal energy produced by the heater to ¼ of its original value in the same period of time, which of the following changes to the heater coil could be made? reduce both the voltage applied and its resistance to ¼ of their original values keep the voltage applied to the heater coil constant but double its resistance double the voltage applied to the heater coil and halve its resistance halve the current in the heater coil and double its resistance 22 / 30 The graph shows how the resistance R of a thermistor varies during part of a day. The thermistor is connected in the potential divider circuit shown below. To obtain an output of 6.0 V at the time of 0730, to which value should the variable resistor be set? 6.0 kΩ 1.5 kΩ 4.5 kΩ 3.0 kΩ 23 / 30 A kettle of power 1200 W takes 15 minutes to boil 3.0 kg of water. If electrical energy costs $0.90 per kW h, how much does it cost to boil 1.0 kg of water using this kettle? 81 cents 27 cents 9 cents 7 cents 24 / 30 Which observation of a piece of metal shows that it is already a permanent magnet? A piece of copper wire is attracted to it. Another magnet is attracted to it. One end of a compass needle is repelled by it. Both ends of a compass needle are attracted to it. 25 / 30 The diagram shows a coil between the poles of two magnets. The coil is part of a d.c. motor which is connected to a d.c. supply. The current flows in the coil as shown in the diagram. In which direction will the coil rotate (as seen by the observer) and what must be connected directly to P and Q of the coil? C D B A 26 / 30 Two current-carrying wires are parallel to each other. The currents in the two wires are flowing in opposite directions. Which of the following correctly shows the direction of the forces acting on the two wires? 27 / 30 The diagram shows a liquid-in-glass thermometer. Which of the following changes will not increase the range of this liquid-in-glass thermometer? increase in the cross-sectional area of the bore increase in the thickness of the glass stem wall increase in the length of the glass stem increase in the volume of the bulb 28 / 30 The lunar lander that carried the first astronauts to the surface of the moon was covered in shiny gold foil. What was the main reason for this? to reduce thermal energy loss from the lander via radiation to reduce thermal energy loss from the lander via conduction to reduce absorption of radiation from the sun to reduce reflection of radiation from the sun 29 / 30 Some gas is heated in a sealed rigid container. Which of the following does not increase? the force due to the collisions between the gas molecules and the container walls the average kinetic energy of the gas molecules in the container the number of collisions per second by the gas molecules on the container walls the average distance between the gas molecules in the container 30 / 30 A fixed mass of a material is heated at a constant rate from solid state until it reaches the gaseous state. The graph below shows how its temperature varies with time. In which state does the material have the smallest specific heat capacity? both solid and gas solid liquid gas Your score is