NJC_2025_H2_Physics_Prelim_P1_QP

[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 24 September 2025 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: 1st digit and the last four digits of the Reg Number. e.g. 2005011 becomes 25011 This document contains 13 printed pages and 3 blank pages. H

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4 1 What is the order-of-magnitude of the mass of twelve one-dollar ($1) Singapore coins? A 100 g B 101 g C 102 g D 103 g 2 A student takes measurements to calculate the density of a liquid in a beaker. The height of the liquid is 0.20 m ± 2%. The internal diameter of the beaker is 0.05 m ± 3%. The mass of the liquid is 0.36 kg ± 10%. What is the percentage uncertainty in the calculated density of the liquid? A 2 % B 5 % C 15 % D 18 % 3 A student throws a stone upwards at an initial speed of 15.0 m s−1. What is the displacement of the stone after 2.00 s? A 1.12 m B 10.4 m C 11.5 m D 12.6 m 4 A student pulls a 2.0 kg crate with a force of 9.0 N directed at an angle 45° from the horizontal as shown in the diagram. A frictional force of 2.0 N acts between the crate and the ground. What is the acceleration of the crate? A 2.2 m s−2 B 3.2 m s−2 C 3.5 m s−2 D 4.5 m s−2 5 Two frictionless trolleys move along the same straight line towards one another. Their masses and velocities before collision are shown. The trolleys collide and stick together. What is the final kinetic energy of the trolleys after the collision? A 0.71 J B 14 J C 31 J D 35 J ground 45° 9.0 N crate

5 [Turn over 6 A spring hangs from the ceiling of a stationary train and a 1.2 kg mass is hung on the spring. The mass causes an extension of 2.4 cm on the spring when it is hung vertically. What is the extension of the spring when the train accelerates horizontally at a rate of 5.0 m s−2? A 1.2 cm B 2.6 cm C 2.7 cm D 3.6 cm 7 A spindle is attached at one end