2020 YIJC H1 Physics Prelims P1 Questions

©YIJC 8867/01/YIJC/20 [Turn over YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CANDIDATE NAME CG INDEX NO PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 8867/01 18 September 2020 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Write your name and class on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty questions on this paper. A nswer 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.

©YIJC 8867/01/YIJC/20 [Turn over 2 Data speed of light in free space, c = 3.00  108 m s–1 elementary charge, e = 1.60  10–19 C unified atomic mass constant, u = 1.66  10–27 kg rest mass of electron, me = 9.11  10–31 kg rest mass of proton, mp = 1.67  10–27 kg the Avogadro constant, NA = 6.02  10–23 mol–1 gravitational constant, G = 6.67  10–11 N m2 kg–2 acceleration of free fall, g = 9.81 m s–2 Formulae uniformly accelerated motion, s = ut + 2 1 at2 v2 = u2 + 2as resistors in series, R = R1 + R2+………. resistors in parallel, 1 R = 11 12 +RR

©YIJC 8867/01/YIJC/20 [Turn over 3 Answer all questions. 1 Which of the following quantities has a unit that can be expressed in terms of just two different SI base units? A charge B force C resistance D power 2 Forces of 4 N and 6 N act at a point. Which one of the following could not be the magnitude of their resultant? A 1 N B 4 N C 6 N D 8 N 3 The diagram shows the path of a projectile fired with a horizontal velocity v from the top of a cliff of height h. Which of the following values for v and h will give the greatest value of angle ? v / m s–1 h / m A 10 30 B 30 30 C 10 50 D 30 50 h cliff sea path of stone θ v

©YIJC 8867/01/YIJC/20 [Turn over 4 4 A volleyball is released from rest at the top of a tall building. Which graph best represents the variation with time t of the acceleration a of the ball as it falls, assuming that the effect of air resistance is significant? A B C D 5 A ball is released from rest above the ground. The graph shows how the ve locity of the bouncing ball varies with time. At which point on the graph does the ball reach the ground for the second time?

©YIJC 8867/01/YIJC/20 [Turn over 5 6 The diagram shows a laboratory experiment in which a feather falls from rest in a long evacuated vertical tube of length L. The feather takes time 10 s to fall from the top to the bottom of the tube. How far would the feather have fallen from the top of the tube in time 5.0 s? A 0.13 L B 0.25 L C 0.50 L D 0.80 L 7 There is no net external force acting on an isolated system during an inelastic collision. For this system, which is row is correct about the conservation of kinetic energy and the conservation of linear momentum? kinetic energy linear momentum A conserved not conserved B conserved conserved C not conserved conserved D not conserved not conserved 8 In a football match, a player kicks a stationary football of mass 440 g and gives it a speed of 32 m s–1. The contact time between the football and the footballer’s boot was 9.2 ms. What is the average force of impact on the football? A 1.5 N B 15 N C 1.5 kN D 1.5 MN 9 When a man is standing in an ascending lift, the magnitude of the force exerted on the man’s feet by the floor is always A equal to the magnitude of his weight. B less than the magnitude of his weight. C more than the magnitude of the force exerted on the lift floor by his feet. D equal to the magnitude of the force exerted on the lift floor by his feet.

©YIJC 8867/01/YIJC/20 [Turn over 6 10 Two cargo trucks of mass 2m and 3m move towards each other in opposite directions with speeds 4v and 2v respectively. These trucks collide and stick together. What is the speed of the trucks after the collision? A 5 4 v B 2 5 v C v D zero 11 One end of a spindle is attached to the centre of a lever of length 1.20 m and its other end is attached to the centre of a disc of radius 0.20 m as shown in the figure below. A cord is wrapped around the disc, passes over a pulley and is attached to a 900 N weight at one end. The mass of the lever, spindle, disc, cord and pulley is assumed to be negligible. Equal and opposite forces of magnitude F is applied to each end of the lever. Ignoring frictional forces, what is the minimum value of F needed to balance the 900 N weight? A 75 N B 150 N C 300 N D 950 N

©YIJC 8867/01/YIJC/20 [Turn over 7 12 A compression spring is being tested in an engineering laboratory. The diagram shows the spring before and after forces are applied to its opposite ends. The initial length of the spring is 5.0 cm and during the application of the forces its length is 4.0 cm. What is the force constant of this spring? A 4.0 ´ 103 N m−1 B 35.0 10 N m−1 C 42.0 10 N m−1 D 44.0 10 N m−1 13 The variation with force F of the extension x of a spring is shown in the figure below. The work done in stretching the spring from x1 to x2 is given by the area A P + Q B S C R + S D Q P F / N x / m Q R S 0

©YIJC 8867/01/YIJC/20 [Turn over 8 14 The variation with time of the vertical speed of a ball falling in air is shown below. During the time from 0 to T, the ball gains kinetic energy and loses gravitational potential energy ΔEp. Which of the following statements is true? A ΔEp is equal to the gain in kinetic energy. B ΔEp is greater than the gain in kinetic energy. C ΔEp is equal to the work done against air resistance. D ΔEp is less than the work done against air resistance. 15 A box of weight 200 N is pushed so that it moves at a steady speed along a ramp, through a height of 1.5 m. The ramp makes an angle 30° with the ground. The frictional force on the box is 150 N while the box is moving. What is the work done by the person? A 150 J B 300 J C 450 J D 750 J time speed 0 0 T

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