SAJC H1 PHY P1

1 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] Class Index Number Name 15 ST. ANDREW’S JUNIOR COLLEGE JC 2 2016 Preliminary Examination Paper 1 PHYSICS, Higher 1 8866/01 20th Sept 2016 1 hour Instructions to students: There are thirty questions in this paper. Answer all the questions. For each question there are four possible answers A, B, C, D. Choose the one you consider correct and record your choice in soft pencil on the separate Optical Mark Sheet (OMS). Each correct answer will score one mark. Double entry of choices will be considered as a wrong answer. A mark will not be deducted for a wrong answer. This question paper consists of 12 printed pages including this page.

2 SAJC 2016 Preliminary Examinations / 8866 [Turn Over]

3 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] 1 Three pairs of physical quantities are listed below: I. momentum and moment of a force II. moment of a force and energy III. power and moment of a force In which of the pairs do the quantities listed below have the same base units? A I only B II only C II and III only D None of the pairs 2 A student carries out an experiment to determine the gravitational acceleration, using a pendulum, and obtains a value 9.81 m s -2. The uncertainties in the measurements are shown. Uncertainty in length L of pendulum = 0.7 % Uncertainty in period T of pendulum = 0.1 % The equation for the period T of pendulum is  2 LT g How should the answer for gravitational acceleration be stated? A  -2(9.8 0.1) m s B  -2(9.81 0.09) m s C  -2(10 8) m s D  -2(10 9) m s 3 For which quantity is the magnitude a reasonable estimate? A frequency of radio wave 500 pHz B mass of an atom 500 g C wavelength of green light 500 m D de Broglie’s wavelength of an electron 500 pm 4 A ball, after having fallen from rest under the influence of gravity for 5 s, crashes onto a horizontal glass plate, thereby losing one-third of its velocity. If it then reaches the ground in 3 s, find the height of the plate above the ground. A 93 m B 123 m C 142 m D 265 m

4 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] 5 A particle P is projected with velocity u1 at an angle of 30 ˚ with the horizontal. At the same time, another particle Q is thrown vertically upwards with velocity u2 from a point vertically below the highest point of path of P. The necessary condition for the two particles to collide at the highest point is A u1 = u2 B u1 = 2u2 C u1 = u2 2 D u1 = 4u2 6 A ball is released from rest above a horizontal surface and bounces several times. The graph shows how y varies with time t What is the quantity y? A vertical velocity B horizontal velocity C vertical displacement D horizontal displacement

5 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] 7 A large sandbag of mass m is lifted by a rope attached to a crane. The variation of its velocity with time is as shown below. What is the difference of tension in the rope supporting the sandbag between the time when the sandbag is moving at uniform speed v and the time when the sandbag is decelerating? A mv t B mg t C m   g - v t D m   v t - g 8 Two masses m1 and m2 are connected by a cord. The tensions, T1 and T2 act on m1 and m2 respectively. The mass m1 rests on a horizontal rough surface which exerts a normal force N and friction f on it. The masses remain stationary. Which pair of forces are equal because of Newton’s 1st Law and which pair have equal magnitudes? Newton’s 1 st Law Forces of equal magnitude A B C D T 1 and T2 T2 and m2 g m1 g and m2 g f and T1 N and m1 g f and m1 g T1 and T2 T1 and T2 velocity time t 0 0 v N m1 g m2 g T1 T2 f

6 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] 9 Two spheres of different masses travel along the same line with velocities u1 and u2. They collide and after collision their velocities are v1 and v2. Which collision is not elastic? u1 / m s-1 u2 / m s-1 v1 / m s-1 v2 / m s-1 A 2 -5 -5 -2 B 3 -3 0 6 C 3 -2 1 6 D 5 2 3 6 10 Forces act along the edges of a square as shown below : The simplest system to which these forces are equivalent is A a single force. B a single couple. C a resultant force and a couple. D two couples. 2 N 2 N 4 N 4 N

7 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] 11 A wooden block rests on a rough board. The end of the board is then raised until the block slides down the plane of the board at a constant velocity. Which row describes the forces acting on the block when sliding with constant velocity? Frictional force on block Net force on block A down the plane down the plane B down the plane zero C up the plane down the plane D up the plane Zero 12 A spring of original length 100 mm is compressed by a force. The graph shows the variation of the length L of the spring with the compressing force F. What is the energy stored in the spring when the length is 70 mm? A 0.09 J B 0.21 J C 0.27 J D 0.63 J 13 A projectile is launched at 45o to the horizontal with initial kinetic energy E. Assuming air resistance to be negligible, what will be the kinetic energy of the projectile when it reaches its highest point? A 0.50E B 0.71E C 0.87E D E

8 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] X Y direction of travel   Z 14 When a horizontal force F is applied to a frictionless trolley over a distance s, the kinetic energy of the trolley increases from 5 J to 10 J. If a force of 2F is applied to the trolley over a distance of 2s, what will be the final kinetic energy of the trolley if it has started with 5 J? A 20 J B 25 J C 40 J D 80 J 15 A car of mass 1200 kg travels along a horizontal road at a speed of 10 m s -1. At the time it begins to accelerate at 0.2 m s -2, the total resistive force acting on the car is 160 N. What is the total output power developed by the car as it begins the acceleration? A 0.80 kW B 1.6 kW C 2.4 kW D 4.0 kW 16 The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from right to left. Which of the following correctly shows the directions of the velocities of the points X, Y and Z on the string? X Y Z A Left left left B Left right left C down up down D Up down up 17 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. The energy per unit time reaching the surface is E. The amplitude of the wave is increase to 2 A and the area of the surface is reduced to ½S. How much energy per unit time reaches this smaller surface? A 4E B 2E C E D ½ E

9 SAJC 2016 Preliminary Examinations / 8866 [Turn Over] 18 A taut wire is clamped at two points 1.0 m apart. It is plucked near one end. Which are the three longest wavelengths present on the vibrating wire when stationary waves are created? A 1.0 m, 0.50 m and 0.25 m B 1.0 m, 0.67 m and 0.50 m C 2.0 m, 1.0 m and 0.50 m D 2.0 m, 1.0 m and 0.67 m 19 Which observation indicates that sound waves are longitudinal? A Sound wave can be reflected from a solid surface B Sound cannot be polarized C Sound can be diffracted around corners. D Sounds can superpose to create observable interference patterns. 20 What is the equivalent resistance of the circuit shown in the figure below between points P and S? Each resistor has a similar resistance of 10 Ω. P Q R