2022 YTSS Phy Prelims P1

NAME: ( ) CLASS: YISHUN TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SEC 4 EXPRESS PHYSICS (6091/1) DATE : 12 Sep 2022 DAY : Monday 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 12 printed pages.

1 The average mass of a feather is 8.2 mg. What is the mass in microgram? A 8.2 x 10–9 µg B 8.2 x 10–3 µg C 8.2 x 103 µg D 8.2 x 109 µg 2 The diagram shows the tallest oil barometer in the world. It is about 4 stories tall. The average height of each storey is about 3 m tall and the density of oil is already known. What instruments are needed to measure the atmospheric pressure with this barometer? 1. a 10 m tape measure 2. a meter rule 3. an inclinometer, which measures θ A 1 only B 2 only C 1 and 3 only D 2 and 3 only 2

3 A bee is flying across a room with a standing fan in it. The bee crosses the room and arrives at a point due north of its starting point. The bee has a speed of V in still air. The fan blowing from east to west causes the bee to move with a speed of W in the same direction. Which diagram represents the resultant velocity R of the bee? A B C D 4 An object falls from rest through the air and reaches terminal velocity. Which statement describes its acceleration? A It is constant and is equal to 0 m/s2. B It is constant and is equal to 10 m/s2. C It increases from 0 m/s2 to 10 m/s2. D It decreases from 10 m/s2 to 0 m/s2. 5 A car travels past three lamp posts, M, N and O. The car takes 2.0s to drive from M to N, which is 30 m apart. The average speed of the car when it travels from M to O is 20 m/s. The distance between M and O is 80 m. What is the estimated speed of the car when it travels from N to O? A 5.0 m/s B 15 m/s C 20 m/s D 25 m/s 3

6 Which statement best describes a gravitational field? A It is a region in which an object experiences a force due to its mass. B It is a region in which an object experiences a force due to its acceleration. C It is a region in which an object experiences an acceleration due to its mass. D It is a region in which an object experiences an acceleration due a force. 7 A stunt man freefalls from rest and opens his parachute 2.3 s later. What is his velocity just before he opens his parachute? A 1.0 m/s B 2.3 m/s C 10 m/s D 23 m/s 8 Which statement about velocity or acceleration is true? A When the velocity = 0 m/s, acceleration must also be 0 m/s2. B When acceleration of an object is positive, the object must be speeding up. C The direction of velocity and the direction of motion is always the same. D The direction of acceleration and the direction of motion is always the same. 9 The graph shows the distance travelled by two cars, P and Q, over a period of time. Which statement about car P and Q at time T is correct? A Car P is faster than car Q. B Car P is ahead of car Q. C Car Q is accelerating. D Car Q is not moving. 10 A block is resting on a table. Two forces act on it: the weight, W, and the normal contact force, N. Which force, with W, makes an action-reaction pair? A The force acting on the block by the table. B The force acting on the block by the Earth. C The force acting on the table by the block. D The force acting on the Earth by the block. 4

11 Which word describes the reluctance of an object to resist a change to its current state of motion? A inertia B force C opposition D resistance 12 A uniform rod is hinged at one end. There is an applied force, F, acting on the rod at its center of gravity (CG). What is the size of the moment produced by F about the hinge? A 40F Ncm B 50F Ncm C 60F Ncm D 80F Ncm 13 The diagram shows a toy parrot pivoted on a rod at its equilibrium orientation. This toy is designed not to fall over even when it is displaced. Where is the position of its center of gravity? 14 A barometer is placed in a room pressurized to 150 000 Pa. The density of mercury and the pressurized air is 14 000 kg/m3 and 1.2 kg/m3 respectively. What is the reading on the barometer? A 1.1 cmHg B 110 cmHg C 130 cmHg D 1300 cmHg 5

15 When a force, F, is applied to the smaller piston of a hydraulic press, as shown, the small piston moves down by a distance, D. How far upwards will the larger piston move? A D/4 B D/2 C 2D D 4D 16 Which of the following is not a unit of energy? A J B kWh C W D VC 17 A 80 g box slides across a horizontal rough surface. The average resistive force acting on the box is 0.40 N. How far will the box travel when its initial velocity is 3.0 m/s? A 0.30 m B 0.90 m C 300 m D 900 m 18 Smoke particles in a transparent box are observed using a microscope. A small point of light is seen to move around as shown. When the temperature in the box is raised, what change can be observed under the microscope? A The small point of light increases in size. B The small point of light glows brighter. C The small point of light moves slower. D The small point of light changes direction more frequently. 6

19 When a fixed mass of gas expands rapidly, the temperature of the gas will decreases rapidly. What happens to the pressure of the gas and the average speed of the gas molecules? pressure of gas average speed of the gas molecules A decreases decreases B decreases remains the same C increases remains the same D increases decreases 20 A liquid changes state by freezing. Which statement about this change is correct? A Energy is gained during this change. B The internal energy of the substance decreases. C The temperature of the substance decreases. D The intermolecular bonds are weakened. 21 The mercury column in a liquid-in-glass thermometer is 6.0 cm and 48 cm long at the lower and upper fixed points respectively. What is the temperature when the mercury column is 14 cm long? A 1.9 oC B 3.4 oC C 19 oC D 34 oC 22 In an experiment, a 30 W heater is used to heat 15 g of ice at 0 oC. The specific latent heat of fusion is 340 J/g. How much ice remains after 2 minutes of heating? A 0.18 g B 4.4 g C 11 g D 14 g 23 When a liquid is heated, its temperature increases while its volume shows negligible change. Which row shows the change in the kinetic and potential energies of the molecules? kinetic energy potential energy A decreases increases B decreases remains the same C increases remains the same D increases increases 7

24 A beam of light is incident across the glass-air boundary. What is the angle of deflection? A 20o B 30o C 40o D 50o 25 Which of the following is not used in calculating the refractive index of the medium? A angle of refraction B critical angle of the medium C frequency of the light D velocity of light in the medium 26 The diagram shows an object placed 40 cm in front of a thin converging lens used to form a real image in a camera. (not drawn to scale) What is the focal length of this lens? A 10 cm B 20 cm C 30 cm D 50 cm 27 Which of the following is true for all EM waves? A cannot be blocked by opaque objects B can be blocked by opaque objects C travel at the same speed in water D can undergo total internal reflection 28 Nana stands 330 m away from a large wall and claps once. She hears another clap sometime later. When compared to the first clap, how is the second clap expected to be? A have lower pitch B have a slower speed C have