DHS 2022 JC1 MYE Physics

1 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Mid Year Examination Year 5 H2 PHYSICS Multiple Choice and Structured Questions Additional Materials: Multiple Choice Answer Sheet 9749 1 July 2022 2 hours READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A There are fifteen questions in this section. 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. You are advised not to spend more than 30 minutes on Section A. Section B Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. You are advised not to spend more than 1 hour 30 minutes on Section B. For Examiner’s Use Section A MCQ 15 Section B 1 10 2 9 3 9 4 11 5 11 6 10 s.f. -1 Total 75 This document consists of 23 printed pages and 1 blank page. 9749 © DHS2022

2 [Turn over Data speed of light in free space, c = 3.00 × 108 m s−1 permeability of free space, µo = 4 π × 10−7 H m−1 permittivity of free space, εo = 8.85 × 10−12 F m−1 = (1/(36π)) × 10−9 F m−1 elementary charge, e = 1.60 × 10−19 C the Planck constant, h = 6.63 × 10 −34 J s unified atomic mass constant, u = 1.66 × 10−27 kg rest mass of electron, m e = 9.11 × 10−31 kg rest mass of proton, mp = 1.67 × 10−27 kg molar gas constant R = 8.31 J K −1 mol−1 the Avogadro constant, NA = 6.02 × 1023 mol−1 the Boltzmann constant, k = 1.38 × 10−23 J K−1 gravitational constant, G = 6.67 × 10 −11 N m2 kg−2 acceleration of free fall, g = 9.81 m s−2 9749 © DHS2022

3 [Turn over Formulae uniformly accelerated motion, s = ut + 1 2 at2 v2 = u 2 + 2as work done on/by a gas, W = p∆V hydrostatic pressure, p = ρgh gravitational potential, φ = −Gm/r temperature, T/K = T/oC + 273.15 pressure of an ideal gas, p = 21 3 Nm cV <> mean translational kinetic energy of an ideal gas molecule, E = kT2 3 displacement of particle in s.h.m., x = x0 sin ωt velocity of particle in s.h.m., v = v 0 cos ωt = ±ω 2 2x xo − electric current, I = Anvq resistors in series, R = R1 + R2 + . . . resistors in parallel, 1/R = 1/R1 + 1/R2 + . . . electric potential, V = r Q oπε4 alternating current / voltage, x = x0 sin ωt magnetic flux density due to a long straight wire, B = 0 2 d Iµ π magnetic flux denxity due to a flat circular coil, B = 0 2 N r Iµ magnetic flux density due to a long solenoid, B = 0nIµ radioactive decay, x = x0 exp(−λt) decay constant, λ = 1 2 ln2 t 9749 © DHS2022

4 Section A Answer all the questions. 1 The power P radiated from a spherical black body can be described using the Stefan-Boltzmann law given by: 4P AT σ= where A is the surface area of the spherical black body, σ is the Stefan-Boltzmann constant, and T is the thermodynamic temperature on the surface of the black body. Which of the following is the unit of σ in SI base units? A W m-2 K-4 B W s m-2 K-4 C kg s-3 K-4 D kg s-2 K-4 2 A car initially travels towards the North at a velocity of 12 m s -1. After some time, it travels towards the West at a velocity of 5.0 m s-1. What is its change in velocity? A 7.0 m s-1 at a direction of 23o East of North. B 7.0 m s-1 at a direction of 23o west of North. C 13 m s -1 at a direction of 23o East of South. D 13 m s-1 at a direction of 23o West of South. 3 A stone is dropped from a tall building. Air resistance is not negligible. The variation of distance travelled by the stone with time is shown by the dashed line. A second stone with the same dimensions but a smaller mass is dropped from the same building. Which line represents the motion of the second stone? 9749 © DHS2022

5 [Turn over 4 An astronaut on the Moon, where there is no air resistance, throws a ball. The ball’s initial velocity has a vertical component of 1 m80 s. − and a horizontal component of 1 m40 s. − , as shown. The acceleration of free fall on the Moon is 2 m1 62 s. − . What will be the speed of the ball 9.00 s after being thrown? A 6.6 m s -1 B 7.7 m s-1 C 10.6 m s-1 D 14.6 m s-1 5 A weather balloon of mass 8.0 kg is attached to a measuring device of mass 5.0 kg by an inextensible cord of negligible mass as shown below. If the system is accelerating vertically upwards at 3.0 m s-2, what is the tension in the cord? A 15 N B 39 N C 64 N D 167 N initial velocity path of ball 3.0 m s−2 weather balloon cord measuring device 9749 © DHS2022

6 [Turn over 6 An object of mass 12 kg is pulled up a smooth inclined plane by a force of 200 N parallel to the plane, as shown in the diagram. The inclined plane is at an angle of 20o to the horizontal. What is the resultant force on the object? A 110 N B 160 N C 196 N D 200 N 7 The diagram below shows a flat ring that is resting horizontally on the exterior surface of a cone. Assuming that friction is negligible, which of the arrows below shows a correct direction of the normal reaction acting on a point of the flat ring? C B D A 9749 © DHS2022

7 [Turn over 8 A beaker of water of total weight W is placed on a weighing scale. A mass of weight M is then lowered into the beaker of water, while suspended from a spring balance using a light inextensible string. The reading on the spring balance is T when the mass is fully submerged in the beaker of water as shown. No water is spilled from the beaker in the process. What is the reading on the weighing scale when the mass is fully submerged in the beaker of water? A W + M B W + T C W + M + T D W + M - T 9 Blocks A and B, each of mass 2.0 and 1.0 kg respectively are connected by a massless spring and arranged on a frictionless table as shown in Fig. 9 (a). A constant force F is applied at one side of block A. After that, they are rearranged as shown in Fig. 9 (b). The same constant force F is applied at one side of block B. What is the ratio of the compression of the spring in Fig. 9 (a) to that in Fig. 9 (b)? A 1 : 2 B 2 : 1 C 1 : 3 D 1 : 1 weighing scale beaker of water spring balance mass string 2.0 kg 1.0 kg F A B Fig. 9 (a) 2.0 kg A B 1.0 kg F Fig. 9 (b) 9749 © DHS2022

8 [Turn over 10 The diagram shows a jar, with the dimensions shown, containing a liquid of mass 3.00 kg and density 600 kg m−3. The liquid exerts a pressure on the base of the jar. What is the pressure exerted by the liquid on the base of the jar? A 1.18 × 103 Pa B 2.94 × 103 Pa C 1.18 × 105 Pa D 2.94 × 106 Pa 11 An object slides with constant velocity across a horizontal sheet of ice. Friction is negligible. A constant horizontal force of 2.1 N is then applied to the object as shown. A short time after applying the force, the object reaches point X at a displacement of 4.0 m from its position when the force was first applied. What is the work done by the force on th