CJC H1 PHY P1 QP

1 [Turn Over NAME: ___________________________________________ CLASS: ___________ INDEX: __________ CATHOLIC JUNIOR COLLEGE JC2 Preliminary EXAMINATIONS Higher 1 PHYSICS 8866/01 Paper 1 1 September 2015 60 min Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, tutorial group and index number 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. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. There are a total of 30 Multiple Choice Questions (MCQs) in 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 Answer Sheet (OMR sheet) provided. 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. Calculators may be used. This document consists of 14 printed pages.

2 [Turn Over PHYSICS DATA: speed of light in free space, c = 3.00 x 108 m s-1 permeability of free space, o = 4 x 10-7 H m-1 elementary charge, e = 1.60 x 10-19 C the Planck constant, h = 6.63 x 10-34 J s unified atomic mass constant, u = 1.66 x 10-27 kg rest mass of electron, me = 9.11 x 10-31 kg rest mass of proton, mp = 1.67 x 10-27 kg acceleration of free fall, g = 9.81 m s-2 PHYSICS FORMULAE: uniformly accelerated motion, s = u t + 2 1 a t2 v2 = u2 + 2 a s work done on / by a gas, W = p V Hydrostatic pressure p =  g h resistors in series, R = R1 + R2 + ... resistors in parallel, R 1 = ... 21 11 RR

3 [Turn Over 1 Estimate the time taken for a laser beam to travel from a laser gun at the grandstand to the goalkeeper. A 3 ns B 300 ns C 3 ps D 300 ps 2 A petrol gauge in a car indicates the volume V of fuel in the tank. V is given by the angular deflection θ of the pointer on a dial such that the scale is linear. The graph below shows the actual variation of the volume V of fuel with the angular deflection θ. Which of the following statements are not correct? P: The petrol gauge is most sensitive when the tank has low fuel level. Q: The petrol gauge is most sensitive when the tank has high fuel level. R: The readings of V from the scale results in a random error. S: The readings of V from the scale results in a systematic error A P & R B P & S C Q & R D Q & S V θ Actual relation between V and θ Empty 0.0 1.0 Full θ 0.2 0.4 0.6 0.8

4 [Turn Over 3 Figure below shows the movement of a vehicle. It is initially moving at 10 m s -1 with a bearing of 60° and after 2 seconds it moves in the bearing of 180o at 5 m s-1. What is the direction and magnitude of the change in velocity? Direction Magnitude/ m s-1 A 180° 5.0 B 90° 8.7 C 123° 11 D 221° 13 4 A ball, dropped from a building, is timed to take (4.5 ± 0.1) s to fall to the ground. If the acceleration of free fall is taken to be 10 m s-2, the calculated height of the building should be quoted as A (101 + 2 ) m B (101 + 5 ) m C (101.3 + 2.3) m D (101.3 + 4.5) m 5 A body is thrown vertically upwards in a medium in which the viscous drag cannot be neglected. If the times of flight for the upward motion tu and the downward motion td (to return to the same level) are compared, then A td < tu, because the average speed is smaller during its downward motion as compared to its upwards motion. B td < tu, because the net accelerating force during its downward motion is greater than the net decelerating force during upwards motion. C td > tu, because the viscous force is greater in the downward motion as compared to its upwards motion. D td > tu, because the net accelerating force during its downward motion is smaller than the net decelerating force during upwards motion. 10 m s-1 5 m s -1 60° Before After

5 [Turn Over 6 When a man is standing in an ascending lift that has a constant upward acceleration, the magnitude of the force exerted on the man’s feet by the floor is always A equal to the magnitude of his weight. B less than the magnitude of his weight. C greater than the magnitude of his weight. D greater than his weight only when the acceleration is greater than g. 7 Three identical stationary discs, P, Q and R are placed in a line on a horizontal, flat and frictionless surface. Disc P is projected straight towards disc Q. If all consequent collisions are perfectly elastic, what will be the final motion of the three spheres? P Q R A stationary stationary moving right B moving left moving left moving right C moving left stationary moving right D moving right moving right stationary P P Q P R P

6 [Turn Over 8 Three forces act on different parts of a rigid body as shown in the diagram below. Which of the following vector diagram represents the body in equilibrium? A B C D 9 A smooth uniform rod of weight W rests on the rim of a smooth, hemispherical bowl as shown in the diagram below. What is the magnitude of the normal contact force by the rim of the bowl on the rod? Diagram is drawn to scale A 0.4 W B 0.6 W C 0.9 W D W

7 [Turn Over 11 A particle of mass m is moving down a rough incline. At position P, its velocity is v1 while at position Q, a vertical distance h down the incline, its velocity is v2. What is the work done against friction in going from P to Q? (Take g to be acceleration due to gravity.) A ½ m v2 2 – ½ m v1 2 B mgh C mgh – (½ mv2 2 – ½ m v1 2) D mgh - ½ mv1 2 10 Four long straight vertical wires carry currents are attached to the corners of a rigid square. A uniform magnetic field is applied in the direction as shown. Which of the following configurations is in equilibrium? A B C D P Q v1 v2 h Top view uniform magnetic field

8 [Turn Over 12 A ball, thrown vertically upwards, rises to a height h and then falls to its starting point. Air resistance may be taken as negligible. Which graph best shows the variation of kinetic energy Ek of the ball with the distance s traveled? A B C D 13 An electric motor is used to haul a cage of mass 100 kg up a mine shaft through a vertical height of 1000 m in 90 s. What will be the electrical power required if the overall efficient is 70 %? A 1.6 kW B 7.8 kW C 15.6 kW D 952 kW 14 The diagram below shows a transverse wave on a rope. The wave is travelling from left to right. At the instant shown, the points P and Q have maximum and zero displacement respectively. Which of the following describes the direction of motion of the points P and Q at this instant? point P point Q A downwards stationary B upwards stationary C stationary downwards D stationary upwards P Q direction of wave Ek s 0 O h s 0 O h s 0 O h s 0 O h Ek Ek Ek

9 [Turn Over 15 A plane wave of amplitude A is incident on a surface of area S placed so that it is perpendicular to the direction of travel of the wave. The energy per unit time intercepted by the surface is E. The amplitude of the wave is doubled and the area of the surface is reduced by half. How much energy per unit time is intercepted by this smaller surface? A 4E B 2E C E D E