2020 ASRJC H1 Physics Prelims P1 Questions

1 8867/01/ASRJC/2020Prelim [Turn over Name: _____________________________ ( ) Class: 20 / ______ 2020 JC2 Preliminary Examination PHYSICS Higher 1 8867/01 Paper 1 Multiple Choice Tuesday 22 September 2020 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and class on the Multiple Choice Answer Sheet. Shade and write your NRIC/FIN. 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 Multiple Choice Answer Sheet. Read the instructions on the Multiple Choice 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 question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages and 1 blank page. ANDERSON SERANGOON JUNIOR COLLEGE

8867/01/ASRJC/2020Prelim 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 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 + 1 2 at 2 v 2 = u 2 + 2as resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + … 2

3 8867/01/ASRJC/2020Prelim [Turn Over 1 What is a reasonable estimate of the mass of a raindrop? A 101 kg B 10−1 kg C 10−3 kg D 10−5 kg 2 A student makes the following measurements to determine the density of a plastic ruler. length = 31.2 ± 0.1 cm cross−sectional area = 0.32 ± 0.02 cm2 mass = 13.78 ± 0.01 g Which statement is correct? A The actual uncertainty of density is 0.03 g cm−3. B The fractional uncertainty of density is 0.031. C The percentage uncertainty of density is 6.6 %. D The density of the plastic ruler is expressed as 1.38 ± 0.07 g cm−3.

4 8867/01/ASRJC/2020Prelim 3 A passenger in a car travelling due East at speed vC sees a motorcyclist travelling due North−West at speed vM. Which diagram shows the velocity vR of the motorcyclist relative to the passenger on the car? A B C D 4 The acceleration−time graph of an object in a straight line is as shown. The object was initially at rest. Which point on the graph does the object has the largest speed? North vM vC vC vM vR vC vM vR vC vM vR vC vM vR acceleration time A B C D

5 8867/01/ASRJC/2020Prelim [Turn Over 5 A student throws two stones from the top of a cliff overlooking a lake. The stones have identical initial speed v0. Stone 1 is thrown at an angle θ below the horizontal, while stone 2 is thrown at the same angle θ above the horizontal. Air resistance is assumed to be negligible. Which of the following statements is true? A Both stones strike the water with the same velocity. B Stone 1 strikes the water with a greater speed than stone 2. C Stone 2 strikes the water with a greater speed than stone 1. D Both stones strike the water with the same speed but at a different angle above the water surface. 6 A ball is dropped from the window of an apartment located at the tenth storey of a high−rise building. After 1 second from the time of release, the ball was observed to have fallen exactly 2 storeys. At which storey will the ball be 2 seconds after it was released? A 2nd B 4th C 6th D 8th stone 2 stone 1 v0 v0 θ θ cliff lake

6 8867/01/ASRJC/2020Prelim 7 A man is skiing down a slope with constant speed. According to Newton’s third law , which force makes an action−reaction pair with the weight of the man? A the friction from the slope B the normal contact force from the slope C the gravitational force on the Earth due to the man D the sum of normal contact force and friction from the slope 8 Two identical blocks move towards each other with speed v on a smooth surface. The blocks collide inelastically. Which statement is correct? A The relative speed of separation is 2v. B The two blocks stick together after collision. C The sum of momentum after collision is less than the sum of momentum before collision. D The sum of momentum after collision is the same as the sum of momentum before collision. 9 The area under the graph represents the impulse during a collision. What is the quantity Y? A kinetic energy B total momentum C resultant force D acceleration v v Y time 0

7 8867/01/ASRJC/2020Prelim [Turn Over 10 A child sits on a car seat which is moving horizontally at constant speed. Which vector best represents the force that the seat exerts on the child? 11 Four forces act on the corners of a rigid square, resting on a frictionless surface. In which situation will the square be in equilibrium? A B C D A B C D F 2F 2F F 2F 2F F F F 2F 2F F 2F 2F F F

8 8867/01/ASRJC/2020Prelim 12 A force of 1.0 N is initially applied to a spring with spring constant 3.5 N m−1. The force is then increased and the spring extends by a further 40 cm. How much extra work is done in producing the additional extension? A 0.023 J B 0.14 J C 0.28 J D 0.68 J 13 A uniform meter rule is supported by a knife −edge at the 40 cm mark and a string at the 100 cm mark. The string passes round a frictionless pulley and carries a mass of 20 g as shown in the diagram. If a 50 g mass is now hung on the string, at which mark on the rule must the knife−edge be supported so that the meter rule will remain in equilibrium? A 14 cm B 25 cm C 32 cm D 36 cm

9 8867/01/ASRJC/2020Prelim [Turn Over 14 A steel ball is released from rest in a tall cylinder of oil. Which graph shows variation with time of the gravitational potential energy, Ep and the kinetic energy, Ek of the ball? A B C D 15 An old-fashioned 60 W lamp converts 95 % of its energy supply into heat. A 4.0 W modern lamp has the same power output of light as the old-fashioned lamp. What is the efficiency of the modern lamp? A 5.0 % B 6.7 % C 75 % D 95 % 16 The engine of a car has maximum output power of 54 kW. The air resistance acting on the car when it is moving with speed v is cv2, where c is 2.0 kg m−1. What is the maximum speed that can be achieved by the car on level road? A 3.0 m s−1 B 5.0 m s−1 C 30 m s−1 D 160 m s−1 Ek Ep energy 0 time Ek Ep energy 0 time Ek Ep energy 0 time energy 0 time Ek Ep

10 8867/01/ASRJC/2020Prelim 17 A body is moving in a uniform circular motion. Which of the following statement is correct? A Both angular