NJC 2022 Prelim P1

[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 14 September 2022 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: 2nd digit and the last four digits of the Reg Number. e.g. 2005011 becomes 05011 This document contains 15 printed pages and 1 blank pages.

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4 1 Which of the following is the best estimate of the kinetic energy of an average National Junior College sprinter? A 25 J B 1500 J C 3500 J D 11000 J 2 A student makes measurements from which he calculates the speed of sound as 327.66 m s –1. He estimates that his result is accurate to ± 3%. Which of the following gives his results reduced to the appropriate number of significant figures? A 300 m s–1 B 320 m s–1 C 328 m s–1 D 330 m s–1 3 A car accelerates uniformly from rest for 16 s along a straight track. What is the ratio distance travelled between 8 s and 16 s distance travelled between 0 s and 8 s ? A 1 B 2 C 3 D 4 4 An object is projected with velocity 35 m s –1 at an angle of 40 o to the horizontal. Air resistance is negligible. What is the speed of the object after 4.0 s? A 26 m s–1 B 32 m s–1 C 67 m s–1 D 70 m s–1 height distance 35 m s–1 40o 0 0

[Turn over 5 5 A trolley of mass 0.50 kg moves with a certain acceleration down a runway which is inclined to the horizontal at 15. If the angle of inclination is increased to 20 , the acceleration of the trolley would be doubled. What is the frictional force, assumed to be the same in both cases, acting on the trolley? A 0.12 N B 0.41 N C 0.86 N D 4.9 N 6 A 5.00 kg object moves at 15.0 m s−1 makes a head-on collision with a 10.0 kg object which was at rest. Both the objects coalesce and move off with a common velocity. How much kinetic energy is lost in the collision? A 188 J B 375 J C 563 J D 702 J 7 Oxygen is compressed in the sealed end of