DHS 2022 JC1 Promos Physics (Paper 1)

1 © DHS 2022 9749 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Promotional Examination Year 5 H2 PHYSICS Section A Multiple Choice Questions Additional Materials: Multiple Choice Answer Sheet 9749 27 September 2022 30 minutes READ THESE INSTRUCTIONS FIRST Write your class, index number and name at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are fifteen 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. The use of an approved scientific calculator is expected, where appropriate. Write your name and class o n the Multiple Choice Answer Sheet . Write and shade the Index Number as follows. For illustration only: A student from class 5C99, with index number 02, should shade “9902”. 9 9 0 2 This document consists of 9 printed pages and 1 blank page.

2 © DHS 2022 9749 [Turn over Data speed of light in free space, c = 3.00 × 108 m s−1 permeability of free space, o = 4 × 10−7 H m−1 permittivity of free space, o = 8.85 × 10−12 F m−1 = (1/(36)) × 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, me = 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

3 © DHS 2022 9749 [Turn over Formulae uniformly accelerated motion, s = ut + 1 2 at2 v2 = u2 + 2as work done on/by a gas, W = pV hydrostatic pressure, p = gh gravitational potential,  = −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 t velocity of particle in s.h.m., v = v0 cos t =  22 xxo − electric current, I = Anvq resistors in series, R = R1 + R2 + . . . resistors in parallel, 1/R = 1/R1 + 1/R2 + . . . electric potential, V = r Q o4 alternating current / voltage, x = x0 sin t magnetic flux density due to a long straight wire, B = 0 2 d I  magnetic flux denxity due to a flat circular coil, B = 0 2 N r I magnetic flux density due to a long solenoid, B = 0nI radioactive decay, x = x0 exp(−t) decay constant,  = 1 2 ln2 t

4 © DHS 2022 9749 [Turn over 1 Four students each made a series of measurements of the acceleration of free fall g. The table below shows the results obtained. Which student obtained a set of results that could be described as precise but not accurate? 2 The equation connecting object distance u, image distance v and focal length f for a lens is 1 1 1 f u v=+ . A student measures values of u and v, with their associated uncertainties. These are u = (50 ± 3) mm v = (200 ± 5) mm. What is the uncertainty in the value of f ? A 2.1 mm B 3.4 mm C 4.5 mm D 6.8 mm 3 An object is dropped, from rest, 10.0 m above the surface of some water. Assuming negligible air resistance, what is the time taken to reach the water and the speed with which the object enters the water? student results, g / m s-2 A 9.81 9.79 9.84 9.83 B 9.81 10.52 9.89 8.94 C 9.45 9.21 8.99 8.76 D 8.45 8.46 8.50 8.41 time / s speed / m s-1 A 1.02 10.0 B 1.02 14.0 C 1.43 10.0 D 1.43 14.0

5 © DHS 2022 9749 [Turn over 4 A single horizontal force F is applied to a block X which is in contact with a separate block Y, as shown. The blocks remain in contact as they accelerate along a horizontal frictionless surface. Air resistance is negligible. X has a greater mass than Y. Which statement is correct? A The acceleration of X is equal to force F divided by the mass of X. B The force that X exerts on Y is equal to F. C The force that X exerts on Y is less than F. D The force that X exerts on Y is less than the force that Y exerts on X. 5 A moving object X with speed v approaches head-on towards a stationary object Y as shown. The two objects collide elastically. After the collision, Y moves to the right with speed 0.67 v. What is the speed of X after the collision? A 0 B 0.33 v C 0.67 v D v

6 © DHS 2022 9749 [Turn over 6 A sample is placed on a tensile testing machine. The graph below shows the variation of the tension applied on the sample with its extension. What is the extension in the sample when the work done on it is 4.4 J? A 6.0 cm B 8.0 cm C 10.0 cm D 12.0 cm 7 A balloon inflated with helium gas is suspended in air. The total mass of the balloon, helium and load is 80.0 kg. The density of air is about 0.00123 g cm-3. Which of the following is the best estimate for the volume of the balloon? A 65 m3 B 65 cm3 C 638 m3 D 638 cm3 8 A ball is thrown vertically upwards. Neglecting air resistance, which statement is correct? A The potential energy of the ball increases uniformly with time during the ascent. B The kinetic energy of the ball is greatest at the greatest height attained. C The total energy of the ball is constant throughout its motion. D The momentum of the ball is constant throughout its motion. 0 10 20 30 40 50 60 70 80 90 100 0 2 4 6 8 10 12 14 tension / N extension / cm

7 © DHS 2022 9749 [Turn over 9 Three masses, each of magnitude 1.0 kg, are fixed to a rod of negligible mass. The rod rotates in a horizontal plane about a pivot at a constant angular velocity of 2.0 rad s−1. What is the horizontal force exerted on the pivot by the rod? A 1.8 N B 2.4 N C 36 N D 48 N 10 The planet Jupiter has satellites called Io and Europa which have different orbital radii and orbital time periods. The table shows the orbital radii for Io and Europa and the orbital time period of Io. What is the orbital time period of Europa? A 0.88 days B 2.4 days C 2.8 days D 3.5 days 11 When a graph of temperature s in kelvin against temperatures in degrees Celsius is plotted, a linear graph is obtained. What is the vertical intercept and gradient of this line? vertical intercept gradient A B C D −273.15 0 0 273.15 1 1 / 273.15 273.15 1 radius / 105 km period / days Io 4.22 1.77 Europa 6.71 ?

8 © DHS 2022 9749 [Turn over 12 Two glass bulbs, X of volume 0.300 m3 and Y of volume 0.600 m3, are connected by a fine tube of negligible volume. A valve prevents gas from flowing between the two bulbs. Both bulbs have a pressure of 1.00 × 105 Pa and a temperature of 25.0 °C initially. Bulb Y is then heated to a temperature of 150.0 °C, and the valve is subsequently opened. What is the new pressure in the system when the valve is opened? A 0.95 × 105 Pa B 1.25 × 105 Pa C 1.42 × 105 Pa D 2.25 × 105 Pa 13 In an experiment to determine the specific latent heat of vaporisation of an unknown liquid X, a student heats liquid X with an electric heater until the liquid boils off completely. The student notes down the following data from the experiment. mass of liquid heated specific heat capac