2024 CJC H1.Phy.PRELIM P1

PHYSICS 8867/1 Paper 1 Multiple Choice 12 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and tutorial group on this cover page. Write and/or shade your name, NRIC / FIN number and HT group on the Answer Sheet (OMR sheet), 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 (OMR sheet). 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 13 printed pages and 1 blank page. [Turn over NAME CLASS 2T Catholic Junior College JC2 Preliminary Examination Higher 1

2 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 at2 v2 = u2 + 2as resistors in series, R = R1 + R2 + . . . resistors in parallel, 1/R = 1/R1 + 1/R2 + . . .

3 [Turn over 1 Which estimate is not realistic? A The power of a hair dryer is 150 W. B The kinetic energy of a running man is 2000 J. C The weight of a can of soft drink is 4 N. D The density of ice is 900 kg m─3. 2 Prefixes are often used to represent powers of 10 when writing the units of quantities. For example, 6.0 microampere, that is, 6.0  10-6 A, is written as 6.0 μA, where μ is the prefix symbol for 10-6 A. Which prefix is not one of the standard symbols? A g B p C m D T 3 To find the resistivity of a semi-conductor, a student makes the following measurements of a cylindrical rod of a material. length = (25 ± 1) mm diameter = (5.0 ± 0.1) mm resistance = (68 ± 1) Ω He calculates the resistivity to be (5.34  10-2) Ω m. How should the uncertainty be included in the student’s statement of the resistivity of the semi-conductor? A (5.34 ± 0.07)  10-2 Ω m B (5.34 ± 0.05)  10-2 Ω m C (5.3 ± 0.4)  10-2 Ω m D (5.3 ± 0.5)  10-2 Ω m

4 4 A ball is released from rest at time zero. After 1.0 s, it hits a horizontal surface and rebounds, reaching the top of its first bounce after 1.5 s. What is the displacement of the ball from its original position after 1.5 s? A 1.25 m B 3.75 m C 5.00 m D 6.25 m 5 A car travelling at speed u comes to a complete halt after a distance s when the driver applies a uniform braking force. A second car, travelling at speed 2u, comes to a halt when the driver applies a uniform braking force with twice the magnitude to that of the first car. You may ignore the reaction time of the driver. What is the distance, in terms of s for the second car to come to a halt? A 0.5s B 2s C 3s D 4s 6 A projectile is fired at an angle of 40.0 above the horizontal, and leaves the gun with a speed of 150 m s-1. The projectile strikes a wall, which is 500 m away, at a vertical height of h. Neglecting the effects of air resistance, what is the vertical height h? A 96.4 m B 327 m C 420 m D 512 m wall 500 m 150 m s-1 40.0 h velocity / ms1 time / s −5 0 0.5 1.0 1.5 5 10 0

5 [Turn over 7 Which of the following pairs of forces is not an example of Newton’s third law of motion? A the force exerted on a man’s feet by the floor and the weight of the man standing on the floor B the forces of repulsion experienced by each of two parallel wires carrying currents in opposite directions C the forces of attraction between an electron and a proton in a hydrogen atom D the force of repulsion between an atom in the surface of a table and an atom in the surface of a book resting on the table 8 What happens to the apparent weight of an object falling freely in an elevator? A It becomes zero. B It decreases. C It increases. D It remains the same. 9 A football of mass 0.42 kg is travelling towards a player at 3.0 m s-1. The player kicks the football with an impulse of 6.3 N s, returning it in the direction of approach. What is the new speed of the football? A 3.3 m s-1 B 5.0 m s-1 C 12 m s-1 D 18 m s-1 10 Which does not involve work being done by a force? A a bicycle free-wheeling downhill at a constant speed B the charging of a car battery C the motion of a spacecraft in deep space D a man climbing up a flight of stairs 11 A load of 6.0 N is placed on a spring that obeys Hooke’s law, causing it to extend 3.0 cm. What additional elastic potential energy will be stored in the spring if it is extended by a further 10.0 cm? A 0.49 J B 0.91 J C 1.6 J D 1.8 J

6 12 A car of mass 1500 kg is accelerated from rest to a speed of 100 kmh−1 on level ground. Given that the time taken is 12.1 s, what is the maximum power delivered by the engine? A 1.72 kW B 47.8 kW C 95.7 kW D 620 kW 13 A mass is initially travelling at right angles to the Earth’s uniform gravitational field, and an electron is initially travelling parallel to a uniform electric field, as shown. What is the direction of the gravitational force and the electric force experienced by the particles respectively? gravitational force on mass electric force on electron A B C D mass gravitational field lines electron electric field lines

7 [Turn over 14 A heavy uniform plank of length L is supported by two forces F1 and F2 at points of distances 6 L and 3 L from its ends as shown. What is the value of 1 2 F F ? A 0.5 B 1.0 C 2.0 D 4.0 15 A uniform rod XY is freely hinged to a wall at X. It is held horizontally by a force F acting from Y at an angle of 60° to the vertical as shown. Which of the following best shows the correct free body diagram of all the forces acting on the rod? A B C D F1 F2 60° F X Y 60° F X Y 60° F X Y 60° F X Y 60° F X Y

8 16 A small marble of mass m is tied to a rectangular block of mass M with an inextensible string as shown in the figure below. The marble is swung in the horizontal plane in circular motion with a constant angular velocity of . The string is passed through a smooth vertical glass tube so that the length l of the string from the top of the glass tube to the marble can vary freely as the angular velocity changes. What is the ratio of m M when mass M is stationary? A 2 l  g B 2l g C 2lg D 22 lg 17 Two planets of equal mass M are rotating at constant speed v, and constant angular velocity in a circular orbit. The radius of the orbit is R as shown in the diagram below. Which expression gives the resultant force acting on each planet? A 2 2 Mv GR B 22Mv GR C 2 2 2 GM v D 2 2 24 GM v m M l glass tube  R v v 

9 [Turn over 18 Which of the following quantities is not necessarily the same for all geostationary satellites orbiting around the Earth? A angular velocity B centripetal acc