2024 CJC H1.Phy.PRELIM_P1_ans

PHYSICS 8867/1 Paper 1 Multiple Choice 12 September 2024 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 and tutorial group on this cover page. Write and/or shade your name, NRIC / FIN number and HT group on the Answer Sheet (OMR sheet), 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 (OMR sheet). 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. MARK SCHEME This document consists of 19 printed pages and 1 blank page. [Turn over NAME CLASS 2T Catholic Junior College JC2 Preliminary Examination Higher 1

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  1023 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 + 1 2 at2 v2 = u2 + 2as resistors in series, R = R1 + R2 + . . . resistors in parallel, 1/R = 1/R1 + 1/R2 + . . .

3 [Turn over 1 Which estimate is not realistic? A The power of a hair dryer is 150 W. B The kinetic energy of a running man is 2000 J. C The weight of a can of soft drink is 4 N. D The density of ice is 900 kg m─3. L2 Answer: A Option A: Hair drye r uses a voltage of 240 V . I f the power is 150 W, then the current is power 150 0.625 Avoltage 240  , which is a low current. The heating coils will not heat up properly. Option B: Assume the average mass of the running man as 70 kg and running at a speed of 8 m s–1. K.E. of man =     21 70 8 2240 J2   . Option C: The volume of a canned drink is approximately 330 ml ~ 400 g in mass. Weight of a can of soft drink = mg = 0.400  9.81 = 3.9 N ~ 4 N. Option D: Ice is less dense than water, which has a density of 1000 kg m–3. 2 Prefixes are often used to represent powers of 10 when writing the units of quantities. For example, 6.0 microampere, that is, 6.0  10-6 A, is written as 6.0 μA, where μ is the prefix symbol for 10-6 A. Which prefix is not one of the standard symbols? A g B p C m D T L1 Answer: A Option B: p is a prefix that represents pico. Option C: m is a prefix that represents milli. Option D: T is a prefix that represents tera. 3 To find the r