NYJC H1 PHY P1 QP

NANYANG JUNIOR COLLEGE JC 2 Preliminary Examination Higher 1 PHYSICS 8866/01 Paper 1 Multiple Choice 23 September 2011 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and tutor’s name 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 you 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. This document consists of 14 printed pages. [Turn over

2 © NYJC 2011 8866/01/J2PRELIM/11 Data speed of light in free space, c = 3.00 x 108 m s−1 elementary charge, e = 1.60 x 10−19 C the Planck constant, h = 6.63 x 10−34 J s unified atomic mass constant u = 1.66 x 10−27 kg rest mass of electron me = 9.11 x 10−31 kg rest mass of proton mp = 1.67 x 10−27 kg acceleration of free fall, g = 9.81 m s−2 Formulae uniformly accelerated motion, s = 21 2ut at+ 2v = 2 2ua s+ work done on/by a gas, W = p∆V hydrostatic pressure, p = ρgh resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + …

3 © NYJC 2011 8866/01/J2PRELIM/11 1 When a constant potential difference, V (in volts) is applied, the electrical current, I ( i n amperes) through a strip of semiconductor varies with its temperature according to 3= VI pT , where T is the absolute temperature (in Kelvins) and p is a constant. What is the possible unit of p? A J s C-2 K-3 C J s K-3 B J s-1 K-3 D J s-1 C-2 K3 2 The period, T of oscillation of an object suspended freely on a spring is given by: k mT π2= , where m is the mass of object in kg and k is the spring constant in N m-1. A student takes measurements of the period in order to calculate the value of k. Given that the student concluded the value of period T as (1.21 ± 0.03) s and the mass of the suspended object, m is (10.0 ± 0.1) kg, what is the correct way to express the calculated value of k in N m-1? Take π = 3.142. A 269.7 ± 16.1 C 270 ± 20 B 270 ± 16 D 300 ± 20 3 Four students measured and calculated the electronic charge e. The table shows the results obtained. Which student, A, B, C or D, obtained a set of results that could be described as most accurate but least precise? Student Electronic Charge, e / 10-19 C A 1.59 1.60 1.58 1.57 1.57 B 1.63 1.64 1.64 1.63 1.65 C 1.62 1.59 1.59 1.61 1.60 D 1.57 1.63 1.64 1.58 1.59

4 © NYJC 2011 8866/01/J2PRELIM/11 4 What is a realistic estimate of the magnitude of the momentum of an Olympic sprinter? A 300 N s B 800 N s C 3000 N s D 8000 N s 5 The diagram below shows the paths of three balls projected from the edge of a cliff. X was projected at an angle of 20o above the horizontal while Y and Z are projected horizontally. Which of the following statements is definitely incorrect? A X is projected with a lower speed than Y. B X is projected with a lower speed than Z. C Y and Z reach the ground at the same time. D X and Y reach the ground at the same time. 6 The diagram below shows how the acceleration of a body, a, which was initially at rest, varies with time, t. At which time is the body the furthest from its initial position? a t A B C D X Y Z

5 © NYJC 2011 8866/01/J2PRELIM/11 7 An object of mass 10.0 kg is initially moving at a velocity of 2.0 m s-1 on a frictionless horizontal surface. A force is then applied to the object in the same direction as its motion as shown in the graph. What is the velocity of the object after 1.0 s? A 3.5 m s-1 C 35 m s-1 B 5.0 m s-1 D 50 m s-1 8 An object of mass m is hanging by a string from the ceiling of a lift. The lift is moving down with a constant deceleration. The tension in the string is A less than mg (but non-zero). C greater than mg. B exactly mg. D zero. 9 An object of mass M is moving with a velocity v before making a head-on collision with a stationary object of mass 3 M. Given that the collision is elastic, the velocity of the object of mass 3M after the collision is A 4 v B 3 v C 2 v D 4 3v force/ N time/ s 1.0 30.0

6 © NYJC 2011 8866/01/J2PRELIM/11 10 A light object is on a horizontal frictionless surface. It is held in equilibrium by three strings with different tensions, as shown in the diagram below. The diagram is not drawn to scale. What is the value of the tension, T ? A 5.2 N C 10.7 N B 9.8 N D 26 N 11 A uniform plank of length 100 cm is supported by two forces, FX and FY at 10 cm from one end and 20 cm from the other respectively as shown. What is the ratio of X Y F F ? A 2 1 B 4 3 C 3 4 D 1 2

7 © NYJC 2011 8866/01/J2PRELIM/11 12 The diagram shows two masses M1 and M2 attached by a light string hanging over a smooth pulley. Initially 2.0 m apart in height, the masses are released. When they are at the same height, their speed is 2.0 m s –1. What is the ratio of M1 / M2 ? A 0.50 B 0.67 C 1.50 D 2.00 13 The diagram below shows the forces acting on a block as it moves up a slope. Which of the following statements is definitely correct? A Work done by F on the block is equal to the negative of work done by f. B Work done by W on the block is equal to the gain in gravitational potential energy of the block. C Work done by N is negative. D The net work done by the four forces is equal to the gain in kinetic energy of the block. F f N W N : Normal reaction W : Weight F : Applied force f : Friction M1 2.0 m M2

8 © NYJC 2011 8866/01/J2PRELIM/11 14 The function of a wind turbine is to convert the kinetic energy of wind to electrical energy. When winds of speed 15.0 m s–1 hit the turbine, they leave the turbine at a speed of 5.0 m s–1. 1000 kg of air hits the turbine every second. If efficiency of the turbine is 25%, what is the electrical power generated by the turbine? A 13 kW C 100 kW B 25 kW D 200 kW 15 The diagram below shows the displacement-time graphs of two particles P and Q separated by a fixed distance of x along the path of a wave. Which of the following correctly states the wavelength and speed of the wave? wavelength speed A 4x 4x / y B 4x x / z C 2y y / 2z D 4z 2z / y y sP t z sQ t 15.0 m s–1 5.0 m s–1

9 © NYJC 2011 8866/01/J2PRELIM/11 16 Waves of wavelength 1.0 m from a point source are observed from two points X and Y, as shown below. If the amplitude of the wave observed at X is a, which of the following correctly states the amplitude of the wave observed at Y and phase difference between the waves at X and Y? Amplitude Phase difference A a 2 π 2 B a 2 π 4 C 2a π3 2 D 2a π3 4 17 Which of the following statements correctly describes the difference between a stationary wave and a progressive wave? A A progressive wave would undergo plane polarisation while a stationary wave will not. B The particles in a stationary wave are stationary while that of a progressive wave are vibrating. C The particles in a progressive wave are oscillating while those in a stationary wave are vibrating about their fixed positions. D The particles in a stationary wave have different amplitudes while those in a progressive wave have the same amplitude. 38