NYJC 2021 H2 Physics 9749 P1 Answer

NYJC 2021 9749/01/J2Prelim/21 [Turn over NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CLASS TUTOR’S NAME CENTRE NUMBER S INDEX NUMBER PHYSICS 9749/01 Paper 1 Multiple Choice 23 September 2021 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, Centre number and index number in the spaces at the top of this page. 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 15 printed pages.

2 NYJC 2021 9749/01/J2Prelim/21 Data speed of light in free space c = 3.00 × 108 m s−1 permeability of free space  = 4 × 10−7 H m−1 permittivity of free space  = 8.85 × 10−12 F m−1 (1 / (36)) × 10−9 F m−1 elementary charge e = 1.60 × 10−19 C the Planck constant h = 6.63 × 10−34 J s 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 molar gas constant R = 8.31 J K−1 mol−1 the Avogadro constant NA = 6.02 × 1023 mol−1 the Boltzmann constant k = 1.38 × 10−23 J K−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 21 2s ut at 22 2v u as work done on / by a gas W p V hydrostatic pressure p gh gravitational potential /Gm r  temperature / K / C 273.15TT    pressure of an ideal gas 21 3 Nmpc V   mean translational kinetic energy of an ideal molecule 3 2E kT displacement of particle in s.h.m. 0 sinx x t  velocity of particle in s.h.m. 0 cosv v t  22 0xx  electric current I Anvq resistors in series 12 . . .R R R   resistors in parallel 121/ 1/ 1/ . . .R R R   electric potential 04 QV r alternating current/voltage 0 sinx x t  magnetic flux density due to a long straight wire   0 2 IB d magnetic flux density due to a flat circular coil  0 2 NIB r magnetic flux density due to a long solenoid  0B nI radioactive decay 0 exp( )x x t  decay constant 1 2 ln2 t 

3 NYJC 2021 9749/01/J2Prelim/21 [Turn over 1 Which of the following is considered as a random error? A Error as a result of using g = 10 m s–2, instead of g = 9.81 m s-2. B Error