YTSS Prelim P1

NAME: ( ) CLASS: YISHUN TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SEC 4 EXPRESS PHYSICS (6091/1) DATE : 27 August DAY : Tuesday DURATION: 1 hr MARKS: 40 marks ADDITIONAL MATERIALS Multiple Choice Answer Sheet (OMS) READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. There are forty questions. 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 separate answer sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. INFORMATION FOR CANDIDATES Any rough working should be done in this booklet. You may use an approved calculator. This question paper consists of 16 printed pages.

2 1 A student makes three statements.  A larger object will always have a larger inertia.  A smaller object will always have a smaller density.  When the mass of an object is kept constant, the gravitational force acting on it must also remain constant. How many statements are always true? A 0 B 1 C 2 D 3 2 A list of 8 physical quantities is shown below: Length Time Energy Force Speed Weight Mass Acceleration How many of them are derived units? A 3 B 4 C 5 D 6 3 What is the conversion factor for converting nanohertz (nHz) to gigahertz (GHz)? A 10 -9 B 10 -12 C 10 -15 D 10 -18

3 4 The figure (not drawn to scale) below shows a climber supported by a rope on a vertical wall. The weight and normal contact force are shown by the labelled arrows. Which vector diagram is correct? A B C D

4 5 The velocity – time graph of a body is shown below. Paul makes four statements about the motion of the body. 1. The body is accelerating in the negative direction. 2. The body is decelerating. 3. The acceleration of the body is decreasing. 4. The speed of the body is increasing. Which statements are correct? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 6 A ball is dropped downwards, hits the floor and rebounds upward. The figure below shows the instance of the ball just before and right after it hits the floor. Which row shows the correct description of the acceleration just before and after the ball hits the floor? just before hitting the floor just after hitting the floor A acceleration is 10 m/s2 downwards acceleration is 10 m/s2 upwards B acceleration is 0 m/s2 downwards acceleration is 0 m/s2 upwards C acceleration is 0 m/s2 downwards acceleration is 0 m/s2 downwards D acceleration is 10 m/s2 downwards acceleration is 10 m/s2 downwards

5 7 A momentary force is applied to a disc on a frictionless surface. The effect of air resistance is negligible. Which statement best describes the subsequent motion of the disc? A It accelerates uniformly. B It decelerates to rest uniformly. C It moves with uniform velocity. D It stops abruptly. 8 A parrot shaped toy is designed to oscillate about a supporting rod as shown below. Where should the center of gravity be located so that the toy is the most stable?

6 9 The diagram shows three syringes. Syringe M and N contains gas, while syringe O contains liquid. Only syringe M is sealed. The temperature is kept constant. Which row describes the pressure correctly in each syringe? syringe M syringe N syringe O A P1 = P2 P1 = P2 P1 < P2 B P1 = P2 P1 < P2 P1 = P2 C P1 < P2 P1 < P2 P1 < P2 D P1 < P2 P1 = P2 P1 = P2 10 Aeroplanes use barometers to determine their height from the sea level. The average height of the atmosphere is 18 km and the average density of air is 1.1 kg/m3. What is the barometer reading when an aeroplane is flying at 12 km above sea level? A 66 Pa B 130 Pa C 66 000 Pa D 130 000 Pa 11 Blow darts are used by some tribes to hunt. The diagram below show a 0.040 g dart speeding up along a 2.0 m long smooth pipe from 0.8 m/s to 2.2 m/s. By applying the principle of energy conservation, what is the average force acting on the dart? A 2.0 x 10–5 N B 4.2 x 10–5 N C 2.0 x 10–2 N D 4.2 x 10–2 N

7 12 A cup of coffee is warmed from 20 oC to 30 oC. Which energy store of the coffee rises? A Its heat store. B Its internal energy store. C Its thermal potential energy store. D Its kinetic energy store. 13 An African elephant has a mass of 6000 kg and each of its four feet has an area of 0.20 m2. What is the average pressure due to the elephant when it is standing stationary on all four feet on level ground? A 19 kPa B 60 kPa C 75 kPa D 300 kPa 14 Which process in the convection of thermal energy occurs in a fluid? A The bulk movement of fluid of different temperature due to changes in density. B The ions that become less dense will rise, while cooler ones sink. C Increased ionic vibration passing on to neighbouring ions. D The expansion and contraction of ions caused by temperature changes forms the convection current. 15 The graph below records how the volume of 1.0 g of ice and water changes with temperature. Three students make statements about this result. student 1: Water will always transfer heat to ice. student 2: The density of ice is always lower than water below 0 oC. student 3: Water contracts from negative temperature to 0 oC. Which students are correct? A 1 only B 2 and 3 C 2 only D 3 only

8 16 Which statement about evaporation is not correct? A Evaporation can only occur in liquid. B Evaporation can occur even when the liquid is already losing heat to the surrounding. C Molecules at the surface leave only if it has absorbed enough energy from the surrounding to overcome the attractive forces. D During evaporation, the average internal kinetic energy of the liquid will decrease. 17 In an experiment, 1500 J of energy is used to heat 0.020 kg of water in a beaker made of a material with excellent thermal conductivity. The specific heat capacity of water is 4200 J/kgK and the change in temperature of water is 12 oC. Assuming the beaker and water are always at the same temperature, what is the heat capacity of the beaker? A 41 J/K B 84 J/K C 209 J/K D 492 J/K 18 Which statement concerning transverse waves is correct? A The direction of wave travel and energy transfer is the perpendicular to each other. B The speed of the wave can be measured from the speed of a wave front travelling forward. C The wave requires a medium so that particles can vibrate and form a wave. D The wave will cause particles to move from one end of the wave to another. 19 A speedometer is aimed at a buoy floating in a water tank. A vibrator is then used to generate a transverse wave in the water tank as shown and the wave causes the buoy to vibrate. The speedometer measures the instantaneous velocity of the buoy and records it in a table. time / s 0.0 0.1 0.2 0.3 0.4 0.5 velocity / m/s 3.142 2.542 0.971 -0.971 -2.542 -3.142 time / s 0.6 0.7 0.8 0.9 1.0 1.1 velocity / m/s -2.542 -0.971 0.971 2.542 3.142 2.542 Which property of the transverse wave can be obtained from the data? A wavelength B amplitude C period D average speed buoy

9 20 A ray of light in a glass block strikes the surface of the block and is refracted. Through which angle does the direction of the ray deviate as it strikes the surface of the block? A 27o B 54 o C 63 o D 126 o 21 We can change the direction of a horizontal beam of light by reflecting it through a plane mirror or a triangular crystal as shown below. In complex optical machinery, triangular crystals are more comm