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, a