WSSS 2021 Prelim P1

1 West Spring Secondary School PRELIMINARY EXAMINATION 2021 Physics 6091/01 SECONDARY 4 EXPRESS Name ( ) Date 17 Sept 2021 Class Duration 1 hr Additional Materials: 1 OTAS READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper-clips, highlighters, glue or correction fluid. Write your name and shade your index number on the Answer Sheet (OTAS) in the spaces provided. There are forty questions on this paper. 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. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 14 printed pages, including this cover page. Setter : Mr Prakash s/o Radakrishna [Turn over

2 1 Which expression has the same SI base units as pressure? 2 Esther has to determine the diameter of a metal sphere using a pair of vernier calipers. Diagram 1 shows the reading when the jaws of the vernier calipers are closed. Diagram 2 shows the reading when measuring the diameter of the metal sphere. What is the actual diameter of metal sphere? A 2.65 cm B 2.73 cm C 2.75 cm D 2.81 cm 3 The diagram shows a pendulum oscillating between positions X and Z. The middle point of the oscillation is Y. The first t ime the pendulum passes through Y , a stopwatch is started. The thirty -first time the pendulum passes through Y, the stopwatch is stopped. The reading is 10 s. What is the period of the pendulum? A 10 15 s B 10 30 s C 10 31 s D 10 60 s 0 1 10 0 10 0 2 3 4 Diagram 1 Diagram 2

3 4 What must be changing when a body is accelerating uniformly? A The speed of the body. B The velocity of the body. C The mass of the body. D The force acting on the body. 5 An object is dropped at time t = 0 from a high building. Air resistance is significant. Three graphs are plotted against time: • the height of the object above the ground, • the speed of the object, • the magnitude of the resultant force on the object. What are the quantities X, Y and Z?

4 6 A train sets off from a station at time t = 0. The graph shows how the distance between the train and the station varies with time. Which statement about the movement of the train between time t 1 and t2 is correct? A I