2024 VJC H1 Prelim P1

VICTORIA JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 1 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 8867/01 20 September 2024 FRIDAY 2.30 pm to 3.30 pm (1 hour) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and Civics Group on the Answer Sheet in the spaces provided unless this has been done for you. DO NOT WRITE ON ANY BARCODES. 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 16 printed pages.

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’s 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 +( ½) at2 v2 = u2 + 2as resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2+ …

3 1. Which one of the following estimates is unrealistic? A The potential energy of a man at the top of Bukit Timah Hill is 100 kJ. B The volume of air in a classroom is 150 m3. C The mass of an apple is 100 g D The average temperature of fire is 300 K. 2. The rate of energy transfer, H through a conducting slab is found experimentally to be given by TH kA l  where the proportionality constant k is the thermal conductivity of the material, A is the cross-sectional area of the slab, l is the length of the slab and ΔT is the temperature difference at opposite faces of the slab. Which of the following are the base units of k? A kg m2 s-2 K-1 B kg m s-3 K-1 C kg m s-2 K-1 D unitless 3. Two projectiles are fired from a gun as shown in Fig. 3. Fig. 3 The first projectile leaves the gun at a velocity of 140 m s−1 at an angle to the horizontal of 75°. The second projectile is fired from the gun at the same position with the same speed but at an angle of 15°. How much time later should the second projectile be fired so that both projectiles land at the same point on the ground at the same time? Ignore the effects of air resistance. A 10 s B 15 s C 20 s D 30 s

4 4. The velocity- time graph