NJC 2024 H2 Physics Prelim P1

[Turn over NATIONAL JUNIOR COLLEGE SENIOR HIGH 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 18 September 2024 1 hour READ THE INSTRUCTION FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, subject class and registration number on the Answer Sheet in the spaces provided unless this has been done for you. 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. The OAS index number is in a 5-digit format. The 5-digit format is as follows: 2nd digit and the last four digits of the Reg Number. e.g. 2005011 becomes 05011 This document contains 15 printed pages and 1 blank pages. H

2

3 [Turn over

4 1 What is the number of heartbeats of a person at rest in one hour, to the nearest order of magnitude? A 101 B 102 C 103 D 105 2 Which experimental technique reduces the systematic error of the quantity being investigated? A measuring the diameter of a wire repeatedly and calculating the average B measuring several internodal distances on a standing wave to find the mean internodal distance C adjusting an analogue ammeter to remove its zero error before measuring a current D timing a large number of oscillations to find a period 3 A block is projected at a certain speed up a frictionless slope. Which of the following graphs correctly shows the relationship between the kinetic energy of the block and the displacement of the block along the slope after its point of projection? A B C D 4 Drops of water falls from the roof of a building 9.0 m high at regular intervals of time. The first drop reaches the ground at the instant the fourth drop starts its fall. What is the distance between the second and third drops from the roof? A 1.0 m B 3.0 m C 4.0 m D 5.0 m Kinetic Energy Kinetic Energy displacement Kinetic Energy displacement Kinetic Energy displacement displacement displacement

5 [Turn over 5 Two objects are being pulled along a smooth floor by a 70 N force as shown. Object A has a mass of 20 kg and object B has a mass of 6.0 kg. The masses do not slide against each other. A B 70 N Which line of the table correctly states the magnitude and direction of friction on A by B? magnitude direction A 16 N to the left B 16 N to the right C 54 N to the left D 54 N to the right 6 In which diagram is the moment of force about point P greatest? A B C D B

6 7 Before two moving bodies collide, they have kinetic energy and momentum. Which row correctly states whether the total kinetic energy and the total momentum are conserved or not after the collision? ` total kinetic energy total momentum A always conserved always conserved B always conserved may change C may change always conserved D may change may change 8 A mass of 0.30 kg slides from rest at height 2.0 m down a smooth curved surface which becomes horizontal at zero height. Another mass with a spring attached has a total mass of 0.50 kg and it is at rest on the level part of the surface. During collision, the maximum compression of the spring is 0.20 m. What is the spring constant? A 184 N m-1 B 196 N m-1 C 253 N m-1 D 294 N m-1 9 A workman on the roof of a hemispherical sports dome of radius 25.0 m lets go of a spanner very close to the highest point A as shown. The surface of the roof is very smooth and the spanner starts to slide from rest down the dome. The spanner loses contact with the surface at point B. 2.0 m 0.30 kg 0.50 kg

7 [Turn over What is the centripetal acceleration of the spanner at point B? A 4.91 m s –2 B 6.54 m s –2 C 7.31 m s –2 D 9.81 m s –2 10 Which of the following statements about geostationary orbits is false? A A geostationary orbit must be directly above the equator. B All satellites in a geostationary orbit must have the same mass. C The period of a geostationary orbit must be 24 hours. D There is only one possible radius for a geostationary orbit. 11 Which of the following is a property of a uniform gravitational field? A It acts equally in all directions B Its field strength is the same at all points within it. C It produces zero force on a stationary test mass placed in it. D The gravitational potential has the same value at all points within it. 12 Three particles have speeds of 2u, 10u and 11u. Which one of the following statements is correct? A The r.m.s. speed exceeds the mean speed by about 1u. B The mean speed exceeds the r.m.s. by about 1u. C The r.m.s. speed exceeds the mean speed by more than 2u. D The mean speed exceeds the r.m.s. speed by more than 2u. 13 A gas cylinder is fitted with a safety valve which releases a gas when the pressure inside the cylinder reaches 2.0 x 106 Pa. Given that the maximum mass of this gas the cylinder can hold at 10C is 15 kg, what would be the maximum mass at 30C? A 5.0 kg B 14 kg C 15 kg D 16 kg

8 14 The graph shows the variation with time t of temperature change ∆ for 1 kg of a substance, initially solid at room temperature. The substance receives heat at a uniform rate of 2000 J min-1. What can be deduced from this graph? A The specific heat capacity of the substance is greater when liquid than when solid. B The specific latent heat of fusion of the substance is 6000 J kg-1. C The substance melts at a temperature of 3 K. D After 10 min, the substance is all gaseous. 15 A student is investigating the specifications of a camera shutter. He used a camera to photograph a simple pendulum bob that is moving in front of a horizontal scale. The extreme positions of the bob were at 600 mm and 700 mm marks. The photograph showed that the bob moved from the 640 mm mark to the 675 mm mark when the shutter was opened. If the period of the pendulum was 2.0 s, what is the time that the shutter has remained opened? A 0.13 s B 0.23 s C 0.40 s D 0.44 s 16 Two particles P and Q are in a sinusoidal wave of amplitude A. The distance of particle P from its equilibrium is A while the distance of particle Q from its equilibrium is 1 3 A. What can be the phase angle between the two particles P and Q? 0 1 2 3 4 5 6 7 8 9 10 t / min 0 1 2 3 4 5 6 7 8 / K

9 [Turn over A 19 o B 45 o C 60 o D 71 o 17 The intensity of a wave depends on the amplitude. The intensity is also proportional to the square of the frequency. A wave has frequency 5.0 Hz, amplitude 2.4 cm and intensity I. What is the intensity of a similar wave of frequency 15.0 Hz and amplitude 1.2 cm? A 4 9 I B 2 3 I C 9 4 I D 36 I 18 Light of wavelength is incident normally on a diffraction grating of slit separation What is the angle between the second order maximum and third order maximum? A 14.5º B 18.6º C 48.6º D 71.4º 19 Two charges