EJC 2022 Prelim P1

©EJC 2022 9749/01/J2H2Prelim/2022 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATIONS 2022 General Certificate of Education Advanced Level Higher 2 PHYSICS Paper 1 Multiple Choice 9749/01 August/September 2022 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, glue or correction fluid. Write your name, civics group and registration number on the Answer Sheet in the spaces provided. 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 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 16 printed pages and no blank pages.

2 ©EJC 2022 9749/01/J2H2Prelim/2022 Data speed of light in free space, ( )( ) 81 71 0 12 1 0 91 19 34 27 31 e 27 p 11 23 1 A 23 1 7 10 m s 10 H m 10 F m 10 F m 10 C 6 63 10 J s 1 66 10 kg 10 kg 10 kg J K mol 60 1 2 10 3 00 4 8 85 1 36 60 9 11 0 16 8 31 13 o 8 ml 1 J K c. . / e. . . R. N k. G h. u. m m .    − −− −− −− − − − − − −− − −−      = =   = = = = =  = = = = =  11 2 2 2 10 N m 8 kg m s 6 67 1 9 . g. −− − =  = permeability of free space, permittivity of free space, elementary charge, the Planck constant, unified atomic mass constant, rest mass of electron, rest mass of proton, molar gas constant, the Avogadro constant, the Boltzmann constant, gravitational constant, acceleration of free fall,

3 ©EJC 2022 9749/01/J2H2Prelim/2022 [Turn over Formulae uniformly accelerated motion, ( ) ( ) 2 22 2 0 0 22 0 12 12 0 0 0 0 0 0 1 2 1 2 2 / K / C 273 15 1 3 3 2 sin cos 1 1 1 4 sin 2 2 exp ln2 at u as V p gh Gm r T T . Nmpc V kT x x t v v t xx R / R / R / R QV r x x t B d NB r s ut v Wp t E Bn t Anvq RR xx              =+  = =− =  + = = = = − ++ = + + = = = = = − = =+ = = = = = I I I I work done on/by a gas, hydrostatic pressure, gravitational potential, temperature, pressure of an ideal gas, mean translational kinetic energy of an ideal gas molecule displacement of particle in s.h.m. velocity of particle in s.h.m. electric current, resistors in series, resistors in parallel, electric potential, alternating current/voltage, magnetic flux density due to a long straight wire magnetic flux density due to a flat circular coil magnetic flux density due to a long solenoid radioactive decay, decay constant

4 ©EJC 2022 9749/01/J2H2Prelim/2022 1 The radius of a helium -4 atom is of the order 10 -10 m and its nucleus has a radius that is of the order of 10−15 m. If all the empty space in the helium atom is removed and the atom size is reduced to that of the nucleus, what is the approximate density of the matter that is formed? A 1014 kg m-3 B 1018 kg m-3 C 1022 kg m-3 D 1026 kg m-3 2 As part of the 1945 Manhattan project, the United States Army tested the first-of-its-kind nuclear weapon in New Mexico. The explosion resulted in a radiant, hemispherical blast wave of radius R which could be modelled using 0.22EtRs     =  where energy released due to explos ion, time elapsed after detonation, density of air. E t  = = = What is the SI unit of the quantity s? A (dimensionless) B m0.2 C J0.2 m− 0.2 s0.4 kg− 0.2 D J− 1 m2 s− 2 kg 3 A ball is thrown upwards vertically near Earth’s surface. It takes a time of 3.20 s to return to the initial position. Assume air resistance is negligible. What is the initial speed with which the ball is thrown? A 3.07 m s-1 B 7.85 m s-1 C 15.7 m s-1 D 31.4 m s-1

5 ©EJC 2022 9749/01/J2H2Prelim/2022 [Turn over 4 A uniform block of dimensions x2 by z is fully submerged at depth d in a tank of water as shown. The block is held vertically in the position shown. The density of the block is the same as the density of the water. If the block is always held at the same depth d below the surface of the water, which single change would increase the magnitude of the upthrust force on the block? A decrease the density of the block B hold the block horizontally C increase dimension z D increase the density of the block 5 Two light identical springs are connected in parallel. A weight of 8.0 N is exerted vertically downwards from the combination as shown. The graph shows the variation with length of the force applied to one of the springs. What is the elastic potential energy stored in one of the springs? A 0.060 J B 0.12 J C 0.14 J D 0.24 J water surface x x z d 8.0 N force / N length /cm 8 6 4 2 0 0 2 4 6 8 10

6 ©EJC 2022 9749/01/J2H2Prelim/2022 6 Which statement about energy is not correct? A Energy is never lost but it may be transferred between different forms. B In an inelastic collision, the total energy is constant. C The efficiency of a system is the ratio of the useful energy output to the total energy input. D When a machine does work, friction reduces the total energy. 7 In the diagram below, blocks B, C, D, E and F are all in contact with each other and are initially at rest on a smooth horizontal surface. Block A moves towards block B with a speed of 10 m s-1. All subsequent collisions are elastic in nature. The mass of both block A and block F is m each. Blocks B, C, D and E have mass of 4m each. Which of the following options concerning blocks A, B, and E after the collisions is true? block A block B block E A at rest move move B move move at rest C move at rest move D move move move 8 A uniform ladder of weight W rests against a vertical wall, tilted at an angle  from a rough floor. The floor exerts normal force NF on the ladder. The wall exerts normal force Nw on the ladder. Which of the following equations is correct? A FWNN= B WFtan 2N WN = − C FWtan 2N WN = − D FWtan 2N WN = + A B C D E F 10 m s-1

7 ©EJC 2022 9749/01/J2H2Prelim/2022 [Turn over 9 Three identical masses are tied using light, inextensible strings of equal lengths r to a pin and made to rotate around the pin by sliding over a smooth horizontal table as shown in the diagram. The strings remain along a straight line as the masses rotate. What is the ratio of tensions in string 1 : string 2 : string 3? A 1 : 2 : 3 B 3 : 2 : 1 C 3 : 5 : 6 D 6 : 5 : 3 10 The graph below shows the variation with distance from the centre of Earth, of the gravitational field strength between the surface of the Earth and the Moon. The areas under the graph segments and the value of the gravitational field strength on Earth’s and on Moon’s surfaces are indicated. What is the minimum speed a mass on the surface of the Moon must have, in order to be able to reach Earth’s surface? A 186 m s-1 B 902 m s-1 C 2280 m s-1 D 11 000 m s-1 r r r pin mass mass gravitational field strength / N kg-1 distance from centre of Earth / m 1.6 − 9.8 Earth area: 61 × 106 J kg-1 area: 2.6 × 106 J kg-1 Moon

8 ©EJC 2022 9749/01/J2H2Prelim/2022 11 A satellite orbits around the Earth in a stable orbit. It is moved to another stable orbit that is further away from the Earth. Which one of the following quantities increases for the satellite? A gravitational force B gravitational potential energy C angular velocity D centripetal acceleration 12 The temperature of an ideal gas is raised from 32.1 ºC to 40.5 ºC.