NJC 2021 SH1 Promo P1 (final)

[Turn over NATIONAL JUNIOR COLLEGE SENIOR HIGH 1 PROMOTIONAL EXAMINATION Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 29 September 2021 1 hour READ THE INSTRUCTION FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, 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 Optical Mark Sheet. Read the instructions 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 14 printed pages and 2 blank pages. OAS index number is in 5-digit format. 5 digit format: 2nd digit and the last four digits of the Reg Number. e.g. 0905648 = 95648.

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4 1 The table shows the abbreviations for multiples and sub -multiples and their corresponding powers of ten. Which power of ten is not stated correctly? A pico 10–12 B nano 10–9 C mega 106 D tera 109 2 A voltmeter connected across a resistor in a circuit gives readings which have high precision but low accuracy. Which of the following best describes the likely error in readings taken with this voltmeter? random error systematic error A high high B high low C low high D low low 3 In the diagram, x and y are two vectors. PS = PQ and ST = PR. What does vector z represent? A x + y B x – y C –x – y D y – x 4 An elevator is moving downwards with an acceleration of 5.8 m s–2. A ball, held 2.0 m above the floor of the elevator and at rest with respect to the elevator, is released. How long does it take for the ball to reach the floor of the elevator? A 0.51 s B 0.64 s C 0.83 s D 1.00 s Q P S R T x y z

[Turn over 5 5 Two cars X and Y are initially travelling at 30 m s–1 on a straight motorway. X overtakes Y by accelerating for 5.0 s to 35 m s –1, remaining at 35 m s –1 for a time T and then decelerating for 5.0 s to 30 m s–1. X advances by 100 m relative to Y during overtaking. The diagram shows the velocity-time graph for X. What is time T ? A 10 s B 15 s C 20 s D 25 s 6 In a tennis match, a ball is hit horizontally with a speed v, as shown in the diagram. The bottom of the ball is initially 3.0 m above the ground and a horizontal distance of 12 m from the net. The ball just clears the net, which is 1.0 m high. What is the value of v ? (Neglect the effects of air resistanc