2024 JPJC H1 Prelim P1 - Printed

[Turn over Data READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided. There are thirty 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 16 printed pages. [Turn over JURONG PIONEER JUNIOR COLLEGE JC2 Preliminary Examination 2024 PHYSICS 8867/01 Higher 1 17 September 2024 Paper 1 Multiple Choice 1 hour Additional Material: Multiple Choice Answer Sheet Name: _______________________________ Class: ______________

2 2024/JPJC/Prelim/8867/01 Data speed of light in free space 81000.3 c m s–1 elementary charge 191060.1 e C unified atomic mass constant 271066.1 u kg rest mass of electron 311011.9 em kg rest mass of proton 271067.1 pm kg the Avogadro constant 231002.6 AN mol–1 gravitational constant 111067.6 G N m2 kg–2 acceleration of free fall 81.9g m s–2 Formulae uniformly accelerated motion 2 2 1 atuts  asuv 222  resistors in series ...21  RRR resistors in parallel .../1/1/1 21  RRR

3 2024/JPJC/Prelim/8867/01 [Turn over 1 What is a reasonable estimate of the cross-sectional area of the wire in a paper clip? A  3 21 10 m B  5 28 10 m C  7 28 10 m D  9 21 10 m 2 The table shows the abbreviations for multiples and sub-multiples and their corresponding powers of ten. What power of ten is not stated correctly? A pico 10−12 B nano 10−6 C mega 106 D tera 1012

4 2024/JPJC/Prelim/8867/01 3 An object is moving with an initial velocity of 4.0 m s−1 to the right. The velocity of the object changes so that its final velocity is 3.0 m s−1 downwards, as shown. Which arrow represents the change in velocity of the object? 4 A photographer wishes to check the time for which the shutter on a camera stays open when a photograph is being taken. It is found that before the shutter opens, the ball falls 2.50 m from rest. During the time that the shutter remains open, the ball falls a further 0.12 m. What is the time that the shutter remains open? A 0.017 s B 0.156 s C 0.714 s D 0.731 s A B C D

5 2024/JPJC/Prelim/8867/01 [Turn over 5 A cannon ball is fired at a speed of 450 m s 1 at sea level at an angle of θ = 31.6 with respect to the horizontal as shown below. The cannon ball hits the top of a watchtower located 900 m away. Ignoring air resistance, how high is the top of the watchtower above sea level? A 527 m B 542 m C 580 m D 1390 m 6 Suppose you are carrying a ball and running on a level road, and wish to throw the ball up while running and catch it as it comes down. Ignoring air resistance, which of the following will allow you to achieve the above act? A Throw the ball at an angle of about 45 ° above the horizontal and maintain the same speed of running. B Throw the ball at an angle of about 45° above the horizontal but run slower in order to catch it. C Throw the ball vertically up in the air and maintain the same speed of running. D Throw the ball vertically up in the air and stop immediately in your path to catch it. sea level θ v = 450 m s1 watchtower 900 m

6 2024/JPJC/Prelim/8867/01 7 A camera drone of mass 1.2 kg hovers at a fixed point above the ground. The drone has four propellers. In a time of 1.0 s, each propeller pushes a mass of 0.40 kg of air vertically downwards. Assume that the air above the propellers is stationary. What is the speed of the air leaving each propeller? A 0.75 m s−1 B 3.0 m s−1 C 7.4 m s−1 D 29 m s−1 8 A mass of 0.20 kg is suspended from the lower end of a light spring. A second mass of 0.10 kg is suspended from the first mass by a thread. The arrangement is allowed to come into static equilibrium and then the thread is cut. Immediately after the thread is cut, what is the upward acceleration of the 0.20 kg mass? A 4.9 m s−2 B 6.5 m s−2 C 9.8 m s−2 D 15 m s−2

7 2024/JPJC/Prelim/8867/01 [Turn over 9 Two asteroids deep in space are involved in an inelastic collision. Which of the quantities, kinetic energy and momentum, are conserved? A Kinetic energy and momentum are both conserved. B Kinetic energy is conserved but momentum is not conserved. C Kinetic energy is not conserved and momentum is conserved. D Neither kinetic energy nor momentum is conserved. 10 Two forces of magnitude 5.0 N act on a plank of length 0.90 m. The forces are parallel and act in opposite directions as shown. What is the torque of the couple? A 1.9 N m B 2.3 N m C 2.9 N m D 3.4 N m 11 A wire that obeys Hooke’s law is of length 1x when it is in equilibrium under a tension 1 .T Its length becomes 2x when the tension is increased to 2T . What is the extra energy stored in the wire as a result of this process? A   2 1 2 1 1 2 T T x x  B   2 1 2 1 1 2 T T x x  C   2 1 2 1T T x x  D   2 1 2 1T T x x  40° 0.10 m 40° 5.0 N 5.0 N 0.20 m

8 2024/JPJC/Prelim/8867/01 12 A uniform sphere of weight 15 N is placed in between two smooth planes as shown. What is the magnitude of the force exerted by the vertical plane on the sphere? A 0 N B 7.5 N C 8.7 N D 26 N 13 A car of mass 800 kg travelling at 130 m s  is brought to rest in 50 m. What is the average retarding force acting on the car? A 240 N B 480 N C 7200 N D 7900 N 60 vertical plane slanted plane sphere

9 2024/JPJC/Prelim/8867/01 [Turn over 14 An object is dropped from the top of a high building and falls freely to the ground. Which graph best represents the variation with time of both its potential energy , Ep and kinetic energy, EK? 15 A skier of mass 60 kg skies down a slope from rest and reaches the bottom with a speed of 20 m s 1. The vertical height of the slope is 50 m and the effective distance the skier moves along the slope is 200 m. What is the average frictional force acting on his ski if he skies down the slope under the influence of gravity only? A 87 N B 150 N C 240 N D 2100 N energy time EK EP C D A B energy time EK EP energy time EK EP energy time EK EP

10 2024/JPJC/Prelim/8867/01 16 A bob of mass m hangs from a light string. The bob is set into motion so that it moves in a horizontal circle of radius r with angular velocity . The string makes an angle of  with the vertical as shown. Which of the following is equal to tan  ? A rg B 2r  C 2 g r D 2r g  17 An aircraft flies in a vertical circular path of radius 1000 m at a constant speed. The passengers feel weightless when the aircraft is at the top of the circular path. What is the speed of the aircraft? A 199 m s  B 1140