NJC 2022 SH1 H2 Physics Promo Paper 1 Final

[Turn over NATIONAL JUNIOR COLLEGE SENIOR HIGH 1 COMMON TEST Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER PHYSICS Paper 1 Multiple Choice Candidate answers on the Question Paper. No Additional Materials are required. 9749/01 30 September 2022 1 hour READ THESE 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 ans wer 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 contains 16 printed 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 Which vector diagram shows the resultant of the vector subtraction P − Q? A B C D 2 With regards to precision and accuracy, which of the following statements is true? A A set of results with poor precision could be made more precise by removing the zero error. B A set of results with poor accuracy could be made more accurate by taking the average of several readings. C A set of results with good precision suggests that the mean value of the experiment is very close to the true value. D A set of results with good accuracy suggests that there are little systematic errors in the experiment. P Q P − Q P Q P − Q P Q P − Q P Q P − Q

5 [Turn over 3 After taking measurements of the quantities in the expression x2y z , the total percentage uncertainty is calculated as 6%. Which individual percentage uncertainties of x, y and z when combined give this total of 6%? x / % y / % z / % A 1 1 4 B 1 2 2 C 2 3 2 D 4 1 1 4 Two identical ball bearings are held at the same height above the ground. One bearing is released from rest. A short time later, the other bearing is released from rest. Air resistance is negligible. As they fall, which of the following statements is true about the vertical distance between them? A The distance will increase continuously. B The distance will remain the same throughout. C The distance will increase initially then decrease. D The distance will increase initially then remains constant.

6 5 An object is dropped at time t = 0 s from a tall building. Air resistance is significant. Three quantities are plotted against time: • height of object above ground • speed of object • magnitude of resultant force on object What are the quantities X, Y and Z? height of object above ground speed of object magnitude of resultant force on object A X Y Z B X Z Y C Y Z X D Z Y X 6 An elevator is moving upwards with uniform upward acceleration of 5.8 m s −2. A ball, held 2.0 m above the floor of 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

7 [Turn over 7 A balloon is acted upon by three forces, weight, upthrust and sideways force due to the wind, as shown in the diagram. What is the rate of change of momentum of the balloon? A 500 kg m s−2 B 1000 kg m s−2 C 1100 kg m s−2 D 1500 kg m s−2 8 A tennis ball of mass 100 g is struck by a tennis racket. The velocity of the ball is changed as shown. What is the magnitude of the impulse on the ball? A 1.0 N s B 5.0 N s C 1000 N s D 5000 N s 9 Two trolleys are placed on a horizontal runway with a compressed spring between them. When they are released, the 2.0 kg trolley moves to the left at 2.0 m s−1. How much energy was stored in the spring? A 4.0 J B 6.0 J C 8.0 J D 12 J 2.0 kg 1.0 kg

8 10 A barrel half -filled with oil of uniform density is on a ramp as shown. The force F is applied in a direction parallel to the ramp such that the barrel is at rest. Which arrow best represents the resultant force the ramp exerts on the barrel? 11 A uniform hoop of weight 20 N can rotate freely about a pin fixed to a wall. The hoop is held in a vertical plane with its diameter at an angle of 40° to the vertical by a horizontal force F. What is the value of F? A 7.3 N B 7.8 N C 9.3 N D 71 N 12 Sand has higher density than cotton. 10.0 kg of sand and 10.0 kg of cotton are separately placed on the same sensitive mass balance in the same setup. Which statement best describes the readings on the mass balance? A The readings are the same. B The reading for sand is larger than that for cotton. C The reading for cotton is larger than that for sand. D There is not enough information to make a comparison. . centre F pin 40° hoop

9 [Turn over 13 A constant force of 100 N, parallel to a rough inclined slope, moves a body of mass 20 kg at constant speed of 5.0 m s −1 through a distance of 40 m along the slope. The body gains a height of 12 m. What is the magnitude of the work done by friction? A 1.6 kJ B 2.4 kJ C 3.7 kJ D 4.0 kJ 14 A moving car experiences a resistive force F which is proportional to its velocity v. Which of the following graphs show s the variation with v of the required power P supplied to the car? A B C D 100 N 0 P v 0 P v P v 0 P v 0

10 15 The graph shows the variation with extension x of the load F on a certain spring. A load of 10 N is placed on the spring. How much additional elastic potential energy will be stored in the spring if it is then extended a further 0.040 m? A 0.200 J B 0.450 J C 0.600 J D 0.800 J 16 A metal bob is suspended with a light inextensible cord from the ceiling. It is set to whirl in a horizontal circle of radius r with a constant speed such that the cord is inclined at an angle  to the vertical as shown in the diagram. What is the period of rotation of the metal bob? A 24 r g B  24 sin r g C  24 tan r g D  24 tanrg 0 5 10 15 20 25 0.00 0.02 0.04 0.06 0.08 0.10 F / N x / m r 